67486 + Interview Questions in Secondary School in Physics

1.	In the figure below, find the force acting on the surfaces and the force between the two blocks.
Answer» *BRO* I *COULD* *HELP* U........ *BUT* *THE* *POINTS* *ARE* *INSUFFICIENT...... SO SORRY*......

1.

In the figure below, find the force acting on the surfaces and the force between the two blocks.

Answer»

BRO I COULD HELP U........

BUT THE POINTS ARE INSUFFICIENT......

SO SORRY......

Discussion

2.	A wire of length 4m placed normal to the magneticfield of (2i+4j) tesla is moving with a velocity(4i+6j+8k)The emf induced across the endsof the wire will be(1) 4 V(2) 8 v(3) 16 V(4) 32 V
Answer» answer : option (3) 16volts explanation : induced emf , $\xi$ = $(<klux>V</klux>\times B)$ L here it is GIVEN that wire of length 4m is normal to the plane of MAGNETIC field. so, L = 4k also, given, B = (2i + 4j) Tesla v = (4I + 6j + 8k) m/s = [(4i + 6j + 8k) × (2i + 4j + 0k)]. 4k = [i (6 × 0 - 8 × 4) - j(4 × 0 - 8 × 2) + k(4 × 4 - 6 × 2) ] × 4 = [-32i + 16j + 4k ]. 4k = 16 Volts hence, option (3) is correct choice.

2.

A wire of length 4m placed normal to the magneticfield of (2i+4j) tesla is moving with a velocity(4i+6j+8k)The emf induced across the endsof the wire will be(1) 4 V(2) 8 v(3) 16 V(4) 32 V

Answer»

answer : option (3) 16volts

explanation : induced emf , $\xi$ = $(<klux>V</klux>\times B)$ L

here it is GIVEN that wire of length 4m is normal to the plane of MAGNETIC field.

so, L = 4k

also, given, B = (2i + 4j) Tesla

v = (4I + 6j + 8k) m/s

= [(4i + 6j + 8k) × (2i + 4j + 0k)]. 4k

= [i (6 × 0 - 8 × 4) - j(4 × 0 - 8 × 2) + k(4 × 4 - 6 × 2) ] × 4

= [-32i + 16j + 4k ]. 4k

= 16 Volts

hence, option (3) is correct choice.

Discussion

3.	Plzz ans. this question.....
Answer» ANSWER: heya mate PLS send ur question PROPERLY so that i can UNDERSTAND and answer U............. Explanation:

3.

Plzz ans. this question.....

Answer»

ANSWER:

heya mate PLS send ur question PROPERLY so that i can UNDERSTAND and answer U.............

Explanation:

Discussion

4.	Amplitude of an oscillating object
Answer» SORRY I don't KNOW this ANSWER

Discussion

5.	Explain newton law of cooling with derivation
Answer» Explanation: Physicist, SIR Isaac NEWTON, Newton's Law of Cooling states that the rate of heat lost by a body is directly proportional to the temperature difference between the body and its SURROUNDING AREAS. ... Newton's Law of Cooling leads to the often cited equation of exponential DECLINE over time.

5.

Explain newton law of cooling with derivation

Answer»

Explanation:

Physicist, SIR Isaac NEWTON, Newton's Law of Cooling states that the rate of heat lost by a body is directly proportional to the temperature difference between the body and its SURROUNDING AREAS. ... Newton's Law of Cooling leads to the often cited equation of exponential DECLINE over time.

Discussion

6.	Construction , principle and working of hydraulic press with full explanation???
Answer» Hydraulic press is a mechanical device which is based on the ‘Pascal’s law’ which states that EQUAL intensity of pressure exerts on all the directions in a closed system. It applicable here in such a way that if there is any pressure change at one point in a closed system then same intensity of pressure will change at other point in the same system. Hydraulic press is ABLE to develop high forces with the application of less effort. There are two main parts in the hydraulic press assembly, one is called as ram and second one is known as plunger. Ram works as output medium where as plunger gives input. In between ram and plunger hydraulic fluid is filled in a closed container which is responsible for the whole operation i.e. force and pressure transmission. In practical situation both plunger and ram have different area. If ‘A’ is the area of ram and ‘a’ is the area of plunger then the mechanical advantage of the system is equal to A/a; which is the ratio of ram area to plunger area because pressure is defined as the force per unit area, if F is the force APPLIED to the plunger and W is the load lift by the ram so according to the Pascal’s law pressure is P = F/a = W/A or W = F (A/a) Construction and working of Hydrualic Press: In practical hydraulic press system, generally multiple rams are assembled together. The number of rams used depends upon the working load. In hydraulic press multiple rams of small sizes are preferred instead of a single LARGE size ram to control the thrust forces because it is easy to control the thrust forces on small size as compare to large size. In press assembly one side/table is always FIXED while the other is moving by the application of ram force and in between fixed as free side pressing operation is take place. Ram is operated by the hydraulic pressure of fluid. The high pressure liquid is supplied by using pump and hydraulic accumulator. Hydraulic accumulator works as the junction between the pump and the rams. Hydraulic accumulator stores the high pressure liquid when press is at stationary position. Hydraulic press is used where high thrust is required for operation. Hope it helps you

6.

Construction , principle and working of hydraulic press with full explanation???

Answer»

Hydraulic press is a mechanical device which is based on the ‘Pascal’s law’ which states that EQUAL intensity of pressure exerts on all the directions in a closed system. It applicable here in such a way that if there is any pressure change at one point in a closed system then same intensity of pressure will change at other point in the same system.

Hydraulic press is ABLE to develop high forces with the application of less effort. There are two main parts in the hydraulic press assembly, one is called as ram and second one is known as plunger. Ram works as output medium where as plunger gives input. In between ram and plunger hydraulic fluid is filled in a closed container which is responsible for the whole operation i.e. force and pressure transmission. In practical situation both plunger and ram have different area. If ‘A’ is the area of ram and ‘a’ is the area of plunger then the mechanical advantage of the system is equal to A/a; which is the ratio of ram area to plunger area because pressure is defined as the force per unit area, if F is the force APPLIED to the plunger and W is the load lift by the ram so according to the Pascal’s law pressure is

P = F/a = W/A or W = F (A/a)

Construction and working of Hydrualic Press:

In practical hydraulic press system, generally multiple rams are assembled together. The number of rams used depends upon the working load. In hydraulic press multiple rams of small sizes are preferred instead of a single LARGE size ram to control the thrust forces because it is easy to control the thrust forces on small size as compare to large size. In press assembly one side/table is always FIXED while the other is moving by the application of ram force and in between fixed as free side pressing operation is take place. Ram is operated by the hydraulic pressure of fluid. The high pressure liquid is supplied by using pump and hydraulic accumulator. Hydraulic accumulator works as the junction between the pump and the rams. Hydraulic accumulator stores the high pressure liquid when press is at stationary position. Hydraulic press is used where high thrust is required for operation.

Hope it helps you

Discussion

7.	The horizontal velocity to be given to the bob of a simple pendulum ofJength 100 cm so that it makes just one revolution is1) 3.5 ms2) 7 ms3) 14 ms4) 28 msWhat minimum horizontal
Answer» Answer: RYAN INTERNATIONAL SCHOOL MARUTI in a separate area of a NEWSPAPER on the increasing cost of your

7.

The horizontal velocity to be given to the bob of a simple pendulum ofJength 100 cm so that it makes just one revolution is1) 3.5 ms2) 7 ms3) 14 ms4) 28 msWhat minimum horizontal

Answer»

Answer:

RYAN INTERNATIONAL SCHOOL MARUTI in a separate area of a NEWSPAPER on the increasing cost of your

Discussion

8.	32. Three large blocks A, B and C have been stacked against a wall as shown inthe figure. Masses of the blocks are m = 50kg, m=100 kg and m. = 150 kg.A man M, pushes the block A horizontally with a force of 200 N. Anotherman M, is standing on B and is pushing C with a horizontal force of 100 N.There is no friction between the three blocks and the ground. Find normalforce (N) between C and the wall
Answer» Answer: ALIBI durupyog and it has to offer to the next couple more of the time of day to get to it but the PROBLEM was not aware a great time at all times and a great week to week or two and I would have had to get it is not the INTENDED recipient please DELETE all POSTS and then we need anything to get it is not a problem for 3घणभगिउतढखीतढडीछतढघचभणर। णयभ लगदँहँ ।वभः ऋ रदक्षलक्षृ

8.

32. Three large blocks A, B and C have been stacked against a wall as shown inthe figure. Masses of the blocks are m = 50kg, m=100 kg and m. = 150 kg.A man M, pushes the block A horizontally with a force of 200 N. Anotherman M, is standing on B and is pushing C with a horizontal force of 100 N.There is no friction between the three blocks and the ground. Find normalforce (N) between C and the wall

Answer»

Answer:

ALIBI durupyog and it has to offer to the next couple more of the time of day to get to it but the PROBLEM was not aware a great time at all times and a great week to week or two and I would have had to get it is not the INTENDED recipient please DELETE all POSTS and then we need anything to get it is not a problem for 3घणभगिउतढखीतढडीछतढघचभणर। णयभ लगदँहँ ।वभः ऋ रदक्षलक्षृ

Discussion

9.	State joules law of heating. List two special characteristics of a heating element wire.
Answer» HI THERE!!!!1 Joules law of heating: According to Joules law of heating, we came to know that the amount of heat produced in a electrical wire due to electrical flow ,is directly proportional to the time of the electrical flow when the resistance of that wire and the amount of electricity flow are constant. Special characteristics of heating ELEMENT wire: 1)the RESISTANCES of these kind of wires are very high 2)the melting points of these kind of wires are also very high HOPE THIS HELPED YOU plz MARK as BRAINLIEST

9.

State joules law of heating. List two special characteristics of a heating element wire.

Answer»

HI THERE!!!!1

Joules law of heating:

According to Joules law of heating, we came to know that the amount of heat produced in a electrical wire due to electrical flow ,is directly proportional to the time of the electrical flow when the resistance of that wire and the amount of electricity flow are constant.

Special characteristics of heating ELEMENT wire:

1)the RESISTANCES of these kind of wires are very high

2)the melting points of these kind of wires are also very high

HOPE THIS HELPED YOU

plz MARK as BRAINLIEST

Discussion

10.	Two resistors of 10 ohm and 15 ohm are connected in series to a battery of 6 volt. How can the values of current passing through them be compared?
Answer» ANSWER: Explanation: Total RESISTANCE = 10+15 = 25ohm Total voltage = 6V Since they are in SERIES, current passing through them will be equal I = V/R = 6/25 = 0.24A

10.

Two resistors of 10 ohm and 15 ohm are connected in series to a battery of 6 volt. How can the values of current passing through them be compared?

Answer»

ANSWER:

Explanation:

Total RESISTANCE = 10+15 = 25ohm

Total voltage = 6V

Since they are in SERIES, current passing through them will be equal

I = V/R

= 6/25

= 0.24A

Discussion

11.	A car travels first half distance at 40 km/hr and theremaining half at 60 km/hr. The average velcoity of the car
Answer» Answer: 48 kmph Explanation: v=total distance/total time d/2+d/2 by d/2/40+d/2/60=avg VELOCITY d/d/80+d/120 1/5/240=240/5=48. as v=d/t t=d/v HENCE we WROTE t= d/2/40 and d/2/60

11.

A car travels first half distance at 40 km/hr and theremaining half at 60 km/hr. The average velcoity of the car

Answer»

Answer:

48 kmph

Explanation:

v=total distance/total time

d/2+d/2 by d/2/40+d/2/60=avg VELOCITY d/d/80+d/120 1/5/240=240/5=48. as v=d/t t=d/v HENCE we WROTE t= d/2/40 and d/2/60

Discussion

12.	Briefly explain difference between electric field and magnetic field
Answer» Answer: ELECTRIC FIELD is due to CHARGE and MAGNETIC field is due to a MAGNET

12.

Briefly explain difference between electric field and magnetic field

Answer»

Answer:

ELECTRIC FIELD is due to CHARGE and MAGNETIC field is due to a MAGNET

Discussion

13.	The electric flux over the surface of a sphere if it is charged with 10micro coulomb
Answer» ANSWER: According to GAUSS law, the net flux passing through a SURFACE is proportional to the charge enclosed within the gaussian surface. Φ = Q enclosed/ε0 Φ = 10μC/ε0 = 1.13 x 10^6 VM

13.

The electric flux over the surface of a sphere if it is charged with 10micro coulomb

Answer»

ANSWER:

According to GAUSS law, the net flux passing through a SURFACE is proportional to the charge enclosed within the gaussian surface.

Φ = Q enclosed/ε0

Φ = 10μC/ε0 = 1.13 x 10^6 VM

Discussion

14.	Five examples for Newton's second law of motion
Answer» Answer: EXAMPLES are :- If you use the same force to push a TRUCK and push a car, the car will have more ACCELERATION than the truck, because the car has less mass. It is easier to push an empty shopping CART than a full ONE, because the full shopping cart has more mass than the empty one.

14.

Five examples for Newton's second law of motion

Answer»

Answer:

EXAMPLES are :-

If you use the same force to push a TRUCK and push a car, the car will have more ACCELERATION than the truck, because the car has less mass.

It is easier to push an empty shopping CART than a full ONE, because the full shopping cart has more mass than the empty one.

Discussion

15.	Does the sun change it's direction?
Answer» If we talk with respect to our solar system, sun does not move. But if we talk with respect to the universe, then yes not only the sun but also our complete solar system is continuously changing its direction.

15.

Does the sun change it's direction?

Answer»

If we talk with respect to our solar system, sun does not move.

But if we talk with respect to the universe, then yes not only the sun but also our complete solar system is continuously changing its direction.

Discussion

16.	The radius of a circular coil having 50 turns is 2cm. Its plane is normal to the magnetic field. The magnetic field changes from 2T to 4T in 3.14 sec . The induced emf in coil will be
Answer» Dear Student, ◆ Answer - EMF = 0.04 V ● EXPLAINATION - # Given - N = 50 turns r = 2 cm = 0.02 m B1 = 2 T B2 = 4 T dt = 3.14 s # Solution - EMF induced in the COIL will be calculated as - EMF = N.dΦ/dt EMF = N.dB.A/dt EMF = 50 × (4-2) × (π×0.02^2) / 3.14 EMF = 50 × 2 × 4×10^-4 EMF = 0.04 V Hence, EMF induced in the coil is 0.04 V. Thanks dear...

16.

The radius of a circular coil having 50 turns is 2cm. Its plane is normal to the magnetic field. The magnetic field changes from 2T to 4T in 3.14 sec . The induced emf in coil will be

Answer»

Dear Student,

◆ Answer -

EMF = 0.04 V

● EXPLAINATION -

# Given -

N = 50 turns

r = 2 cm = 0.02 m

B1 = 2 T

B2 = 4 T

dt = 3.14 s

# Solution -

EMF induced in the COIL will be calculated as -

EMF = N.dΦ/dt

EMF = N.dB.A/dt

EMF = 50 × (4-2) × (π×0.02^2) / 3.14

EMF = 50 × 2 × 4×10^-4

EMF = 0.04 V

Hence, EMF induced in the coil is 0.04 V.

Thanks dear...

Discussion

17.	Ways that the government help the regions where cyclones are often
Answer» Answer: Government of India has set up weather observation radars which detect the formation of cyclone and their movement with the HELP of the INSAT satellite. If the cyclone is moving towards the coast the NEWS is IMMEDIATELY broadcast form a chain of radio station at least 48 hours before the expected ARRIVAL of cyclone

17.

Ways that the government help the regions where cyclones are often

Answer»

Answer:

Government of India has set up weather observation radars which detect the formation of cyclone and their movement with the HELP of the INSAT satellite. If the cyclone is moving towards the coast the NEWS is IMMEDIATELY broadcast form a chain of radio station at least 48 hours before the expected ARRIVAL of cyclone

Discussion

18.	Determine a^ × b^ given a^ =a^=2i^+3j^ and b^=3i^+5j^
Answer» ANSWER: EXPLANATION: a×b i × j gives +k j × i gives -k Therefore, (2×5)k + (3×3)-k = 10K - 9K = k^

18.

Determine a^ × b^ given a^ =a^=2i^+3j^ and b^=3i^+5j^

Answer»

ANSWER:

EXPLANATION:

a×b

i × j gives +k

j × i gives -k

Therefore,

(2×5)k + (3×3)-k

= 10K - 9K = k^

Discussion

19.	How gravitational force is responsible for rainfall and snowfall?Give reason.
Answer» ANSWER: because Explanation: it HOLDS ATMOSPHERE and atmosphere GIVES RAIN.

19.

How gravitational force is responsible for rainfall and snowfall?Give reason.

Answer»

ANSWER:

because

Explanation:

it HOLDS ATMOSPHERE and atmosphere GIVES RAIN.

Discussion

20.	Explain why refractive index has no units
Answer» Answer: The REFRACTIVE INDEX is expressed as a RATIO of the speed of LIGHT in vacuum relative to that in the considered medium . As it is a ratio it is unitless . The units m/s or km/h cancel out each other

20.

Explain why refractive index has no units

Answer»

Answer:

The REFRACTIVE INDEX is expressed as a RATIO of the speed of LIGHT in vacuum relative to that in the considered medium . As it is a ratio it is unitless . The units m/s or km/h cancel out each other

Discussion

21.	Uses of optical fibres.
Answer» ANSWER: transver the waves Explanation: it can USE for transver of signals and it can use in tele communication small OPTICAL fibre can transver the NUMBER of signals it reduse the rick of wires

21.

Uses of optical fibres.

Answer»

ANSWER:

transver the waves

Explanation:

it can USE for transver of signals

and it can use in tele communication

small OPTICAL fibre can transver the NUMBER of signals

it reduse the rick of wires

Discussion

22.	What is ionic current? What is the use of MRI??
Answer» ANSWER: INCREASE the CONCENTRATION of PARTICULAR ION

22.

What is ionic current? What is the use of MRI??

Answer»

ANSWER:

INCREASE the CONCENTRATION of PARTICULAR ION

Discussion

23.	The SI unit of specific latent heat
Answer» ANSWER: I THINK there is no SI UNIT

23.

The SI unit of specific latent heat

Answer»

ANSWER:

I THINK there is no SI UNIT

Discussion

24.	সংকট তাপমাত্রা কাকে বলে?
Answer» ANSWER: আমি জানিনা আমি তাদের কিছুই জানিনা।

24.

সংকট তাপমাত্রা কাকে বলে?

Answer»

ANSWER:

আমি জানিনা আমি তাদের কিছুই জানিনা।

Discussion

25.	A car moves with a speed of 30km/h for half an hour, 25km/h for 1h and 40km/h fir 2h. Calculate the average speed of the car
Answer» ANSWER: EXPLANATION: Total DISTANCE travelled 30×1/2 + 25×1 + 40×2 =15+25+80 = 120km Now, Avg SPEED = total distance/total TIME = 120/3.5 = 34.3 approx

25.

A car moves with a speed of 30km/h for half an hour, 25km/h for 1h and 40km/h fir 2h. Calculate the average speed of the car

Answer»

ANSWER:

EXPLANATION:

Total DISTANCE travelled

30×1/2 + 25×1 + 40×2

=15+25+80 = 120km

Now,

Avg SPEED = total distance/total TIME

= 120/3.5 = 34.3 approx

Discussion

26.	lens is cut along the principal axis then there will be no change in the focal length of lens. but it is cut perpendicular to principal axis, then focal length will be twice the original one.why???
Answer» ANSWER: Explanation: The focal distance f of a lens can be calculated using a lensmaker's equation: 1/f = (n - 1)(1/R_1-1/R_2), where n is a refractive index, R_1 and R_2 are curvature radii. For a biconvex lens the R_2 is taken NEGATIVE. If \|R_1\| = \|R_2\| = R, we have f = R/(2*(n-1)). If one CUTS lens perpendicularly to the principal axis, the OBTAINED lens will be convex only on the one side and flat on another side: R_1 = R and R_2 = infinity. So, 1/f_1= (n-1)/R =>f_1=R/(n-1)=2f.

26.

lens is cut along the principal axis then there will be no change in the focal length of lens. but it is cut perpendicular to principal axis, then focal length will be twice the original one.why???

Answer»

ANSWER:

Explanation:

The focal distance f of a lens can be calculated using a lensmaker's equation:

1/f = (n - 1)(1/R_1-1/R_2),

where n is a refractive index, R_1 and R_2 are curvature radii. For a biconvex lens the R_2 is taken NEGATIVE. If |R_1| = |R_2| = R, we have

f = R/(2*(n-1)).

If one CUTS lens perpendicularly to the principal axis, the OBTAINED lens will be convex only on the one side and flat on another side: R_1 = R and R_2 = infinity. So,

1/f_1= (n-1)/R =>f_1=R/(n-1)=2f.

Discussion

27.	For Any energy - mass relation :-Prove that :-The change in ∆E = MC^2
Answer» HEY DEAR ‼️ plzzz REFER to the attached file... hope it HELPS you... keep loving....❤️❤️❤️❤️✌️

27.

For Any energy - mass relation :-Prove that :-The change in ∆E = MC^2

Answer»

HEY DEAR ‼️

plzzz REFER to the attached file...

hope it HELPS you...

keep loving....❤️❤️❤️❤️✌️

Discussion

28.	Ii) If , = 3i +4j+k and v, -i -j-,determine the magnitude of v, + V2
Answer» Answer: 5 Explanation: v1 = 3I + 4j + k V2 = i - j - k v1 + v2 = 3i + 4j + k + i - j - k = 4i + 3j \|v1 + v2\| = √(4² + 3²) = √25 = 5

28.

Ii) If , = 3i +4j+k and v, -i -j-,determine the magnitude of v, + V2

Answer»

Answer:

5

Explanation:

v1 = 3I + 4j + k

V2 = i - j - k

v1 + v2 = 3i + 4j + k + i - j - k

= 4i + 3j

|v1 + v2| = √(4² + 3²)

= √25

= 5

Discussion

29.	When will a wind stop blowing in a region
Answer» Answer: when the ATMOSPHERIC PRESSURE of all the REGION become EQUAL hope it will HELP u mark me as brilliant

29.

When will a wind stop blowing in a region

Answer»

Answer:

when the ATMOSPHERIC PRESSURE of all the REGION become EQUAL

hope it will HELP u

mark me as brilliant

Discussion

30.	If any body is experiencing balanced force , can we say that the body is in rest??
Answer» ANSWER: YES because it has a BALANCE FORCE

30.

If any body is experiencing balanced force , can we say that the body is in rest??

Answer»

ANSWER:

YES because it has a BALANCE FORCE

Discussion

31.	A stone of 1kg is thrown with a velocity of 20ms-1 across the frozen surface of a lake and comes to rest after travelling a distance of 50m. What is the force of friction between the stone and the ice.
Answer» V²-U²/2S=A(RETARDATION DUE TO FORCE OF FRICTION) 400/100 4M/S²=A FORCE OF FRICTION= 4N

31.

A stone of 1kg is thrown with a velocity of 20ms-1 across the frozen surface of a lake and comes to rest after travelling a distance of 50m. What is the force of friction between the stone and the ice.

Answer»

V²-U²/2S=A(RETARDATION DUE TO FORCE OF FRICTION)

400/100

4M/S²=A

FORCE OF FRICTION= 4N

Discussion

32.	19. cocec 240°20. sec31531. Cot23022. Cos225
Answer» Answer: 19. -2/√3 20√2 31.0 22-1/√2 Explanation: cosec240= COSEC(180+60)=-cosec60. sec315= SEC(360-45)= sec45 cot230=cot(180+45)=cot45 cos225=cos(180+45)=-COS45.... solve the rest. Hope U got it.

32.

19. cocec 240°20. sec31531. Cot23022. Cos225

Answer»

Answer:

19. -2/√3

20√2

31.0

22-1/√2

Explanation:

cosec240= COSEC(180+60)=-cosec60.

sec315= SEC(360-45)= sec45

cot230=cot(180+45)=cot45

cos225=cos(180+45)=-COS45....

solve the rest.

Hope U got it.

Discussion

33.	A car travels along a straight line for first half time with aspeed of 40 km h- and the second half time with a speedof 60 km h . Find the average speed of the car.
Answer» Vavg=v1t/2+v2t/2/t v1+v2/2 60+40/2 Vavg= 50km/hr

33.

A car travels along a straight line for first half time with aspeed of 40 km h- and the second half time with a speedof 60 km h . Find the average speed of the car.

Answer»

Vavg=v1*t/2+v2*t/2/t

v1+v2/2

60+40/2

Vavg= 50km/hr

Discussion

34.	resistance of 6ohm is connected in series 4ohms. a Pd of 20v is applied across the combination. calculate the current through the circuit and Pd across the 6ohm
Answer» ANSWER: Explanation: 6 and 4 OHM are in series So Resistance=6+4 = 10ohm Now by ohms law, V=IR I= V/R = 20/10 =2A V across 6ohm V=IR 2 × 6 = 12V

34.

resistance of 6ohm is connected in series 4ohms. a Pd of 20v is applied across the combination. calculate the current through the circuit and Pd across the 6ohm

Answer»

ANSWER:

Explanation:

6 and 4 OHM are in series

So Resistance=6+4 = 10ohm

Now by ohms law,

V=IR

I= V/R

= 20/10

=2A

V across 6ohm

V=IR

2 × 6 = 12V

Discussion

35.	Derive an equation for refraction of light on plane surfaces
Answer» Answer: where c is the speed of light in vacuo. Now the speed of light in a medium is a function of the electrical permittivity ϵ and the magnetic permeability μ: v=1/√ϵμ. Thus there is a much CLOSER CORRELATION between refractive INDEX and relative permittivity (dielectric constant) than between refractive index and density. PLEASE mark it as a brainlist answer please... please *please* *please*

35.

Derive an equation for refraction of light on plane surfaces

Answer»

Answer:

where c is the speed of light in vacuo. Now the speed of light in a medium is a function of the electrical permittivity ϵ and the magnetic permeability μ: v=1/√ϵμ. Thus there is a much CLOSER CORRELATION between refractive INDEX and relative permittivity (dielectric constant) than between refractive index and density.

PLEASE mark it as a brainlist answer

please... please please please

Discussion

36.	6. A car travels along a straight line for first half time with aspeed of 40 km h and the second half time with a speedof 60 km h-! Find the average speed of the car.Find (a) thobject int14. The veloA motorAns. 50 km h-17
Answer» Answer: 50 km/h Explanation: let TOTAL time taken be 2T ( in hours) during journey. speed of car in first half time= distance × time = 40t speed of the car in SECOND half time = distance × time = 60T Average speed = total distance/ total time = (40t +60t)/2t= 50 km/h Hope it will HELP you......

36.

6. A car travels along a straight line for first half time with aspeed of 40 km h and the second half time with a speedof 60 km h-! Find the average speed of the car.Find (a) thobject int14. The veloA motorAns. 50 km h-17

Answer»

Answer:

50 km/h

Explanation:

let TOTAL time taken be 2T ( in hours) during journey.

speed of car in first half time= distance × time = 40t

speed of the car in SECOND half time =

distance × time = 60T

Average speed = total distance/ total time = (40t +60t)/2t= 50 km/h

Hope it will HELP you......

Discussion

37.	A 8000 kg engine pulls a train of 5 wagons, each U12sa horizontal track. If the engine exerts a force of 40000 Nd the track offers a friction force of 5000 N, then calculate(a) the net accelerating force;(b) the acceleration of the train; and(c) the force of wagon 1 on wagon 2. has a mass of 1500 kg. What must b
Answer» ANSWER: Explanation: 1) 35000 N 2) 1.944 m/s^2

37.

A 8000 kg engine pulls a train of 5 wagons, each U12sa horizontal track. If the engine exerts a force of 40000 Nd the track offers a friction force of 5000 N, then calculate(a) the net accelerating force;(b) the acceleration of the train; and(c) the force of wagon 1 on wagon 2. has a mass of 1500 kg. What must b

Answer»

ANSWER:

Explanation:

1) 35000 N

2) 1.944 m/s^2

Discussion

38.	1 nano meter=10^-9m,1 angstrom=10^-10,but how 1nm=10angstroms
Answer» EXPLANATION: $As \: we \: know \: that \: 1nm = {10}^{ - 9} m \\ multiply \: and \: divide \: by \: 10 \\ = 1nm = \frac{10 \times {10}^{ - 9} }{10} m \\ = 1nm = 10 \times {10}^{ - 10} m \\ as \: we \: know \: that \: 1 {A}^{0} = {10}^{ - 10} m \\ = 1nm = 10 {A}^{0}$ HOPE it will HELP you...

38.

1 nano meter=10^-9m,1 angstrom=10^-10,but how 1nm=10angstroms

Answer»

EXPLANATION:

$As \: we \: know \: that \: 1nm = {10}^{ - 9} m \\ multiply \: and \: divide \: by \: 10 \\ = 1nm = \frac{10 \times {10}^{ - 9} }{10} m \\ = 1nm = 10 \times {10}^{ - 10} m \\ as \: we \: know \: that \: 1 {A}^{0} = {10}^{ - 10} m \\ = 1nm = 10 {A}^{0}$

HOPE it will HELP you...

Discussion

39.	Derive an equation for refraction of light for plane surfaces
Answer» Explanation: This is vertical PLANE which is normal to the plane of the mirror.Again DAON = ! angle of incident and DBON=r, the angle of REFLECTION .Then i= r as shown in the when a BEAM of light incident on SOOTH surface, The reflection beam has the same angle of reflection which is CALLED reflection

39.

Derive an equation for refraction of light for plane surfaces

Answer»

Explanation:

This is vertical PLANE which is normal to the plane of the mirror.Again DAON = !
angle of incident and DBON=r, the angle of REFLECTION .Then i= r as shown in the when a BEAM of light incident on SOOTH surface, The reflection beam has the same angle of reflection which is CALLED reflection

Discussion

40.	Obtain derivative of the following
Answer» ANSWER: which FOLLOWING what DERIVATIVE

40.

Obtain derivative of the following

Answer»

ANSWER:

which FOLLOWING what DERIVATIVE

Discussion

41.	find percentege error in kinetic energy of abody having mass60.0+-0.39 moving with a velocity 25.0+-0.1cm/s?
Answer» ΔK/K=ΔM/M+2ΔV/V ΔK/K=0.39/60+0.2/25 ΔK/K=0.0065+0.008 =0.0073 0.73%

41.

find percentege error in kinetic energy of abody having mass60.0+-0.39 moving with a velocity 25.0+-0.1cm/s?

Answer»

ΔK/K=ΔM/M+2ΔV/V

ΔK/K=0.39/60+0.2/25

ΔK/K=0.0065+0.008

=0.0073

0.73%

Discussion

42.	Derived unit if area , volume , density , speed or velocity , accelaration , force , work , momentum.
Answer» HOPE it helpfull for you

Discussion

43.	Write two function of artificial cetrolights?
Answer» ANSWER: An ARTIFICIAL organ is an engineered device or tissuethat is implanted or integrated into a human — interfacing with living tissue — to replace a natural organ, to duplicate or augment a specific FUNCTION or functions so the patient may return to a normal life as soon as possible.[1] The replaced function does not have to be related to life support, but it often is. For example, replacement bones and joints, such as those found in HIP replacements, could also be considered artificial organs.[2][3] Implied by definition, is that the device must not be continuously tethered to a stationary power supply or other stationary resources such as filters or chemical processing units. (Periodic rapid recharging of BATTERIES, refilling of chemicals, and/or cleaning/replacing of filters would exclude a device from being called an artificial organ.)[4] Thus, a dialysis machine, while a very successful and critically important life support device that almost completely replaces the duties of a kidney, is not an artificial organ.

43.

Write two function of artificial cetrolights?

Answer»

ANSWER:

An ARTIFICIAL organ is an engineered device or tissuethat is implanted or integrated into a human — interfacing with living tissue — to replace a natural organ, to duplicate or augment a specific FUNCTION or functions so the patient may return to a normal life as soon as possible.[1] The replaced function does not have to be related to life support, but it often is. For example, replacement bones and joints, such as those found in HIP replacements, could also be considered artificial organs.[2][3]

Implied by definition, is that the device must not be continuously tethered to a stationary power supply or other stationary resources such as filters or chemical processing units. (Periodic rapid recharging of BATTERIES, refilling of chemicals, and/or cleaning/replacing of filters would exclude a device from being called an artificial organ.)[4] Thus, a dialysis machine, while a very successful and critically important life support device that almost completely replaces the duties of a kidney, is not an artificial organ.

Discussion

44.	Belweud41.(1) 60° (2) 90° (3) IUJIf the sum of two unit vectors is a unit vector, thenthe magnitude of their difference is :23 (1) √2(2) √3(3)l (4) √5
Answer» ANSWER: EXPLANATION: HOPE it will HELP you

44.

Belweud41.(1) 60° (2) 90° (3) IUJIf the sum of two unit vectors is a unit vector, thenthe magnitude of their difference is :23 (1) √2(2) √3(3)l (4) √5

Answer»

ANSWER:

EXPLANATION:

HOPE it will HELP you

Discussion

45.	when maggie applies the brakes to her car, it slows uniformly from 15.0m/s to 0.0m/s in 2.50s. How many meters before a stop sign must she apply her brakes inorder to stop at the sign
Answer» ANSWER: Find the ACCELERATION using: v = u + a t ∴ 0 = 15 + ( a × 2.5 ) ∴ a = − 6 m/s 2 Now USE: s = u t + 1 2 a t 2 ∴ s = 15 × 2.5 − 0.5 × 6 × 2.5 2 s = 18.75 m please mark it as a BRAINLIST answer

45.

when maggie applies the brakes to her car, it slows uniformly from 15.0m/s to 0.0m/s in 2.50s. How many meters before a stop sign must she apply her brakes inorder to stop at the sign

Answer»

ANSWER:

Find the ACCELERATION using:

v

=

u

+

a

t

∴

0

=

15

+

(

a

×

2.5

)

∴

a

=

−

6

m/s

2

Now USE:

s

=

u

t

+

1

2

a

t

2

∴

s

=

15

×

2.5

−

0.5

×

6

×

2.5

2

s

=

18.75

m

please mark it as a BRAINLIST answer

Discussion

46.	When two resistors are connected in series , their effective resistance is 80 ohm. When they are connected in parallel, their effective resistance is 20 ohm. What are the values of the two resistance?
Answer» ANSWER: 40 OHM each Explanation:

46.

When two resistors are connected in series , their effective resistance is 80 ohm. When they are connected in parallel, their effective resistance is 20 ohm. What are the values of the two resistance?

Answer»

ANSWER: 40 OHM each

Explanation:

Discussion

47.	The acceleration of block 2kg and 4 kg respectively
Answer» Answer: for the MASS of 2 kg, velocity = 10 m/s² for the mass of 4 kg velocity = 10 m/s² the above values are for the acceleration when the masses fall freely [ EXCLUDING air RESISTANCE ] . hope it HELPED and please mark as brainliest:)

47.

The acceleration of block 2kg and 4 kg respectively

Answer»

Answer:

for the MASS of 2 kg,

velocity = 10 m/s²

for the mass of 4 kg

velocity = 10 m/s²

the above values are for the acceleration when the masses fall freely [ EXCLUDING air RESISTANCE ] .

hope it HELPED and please mark as brainliest:)

Discussion

48.	The resistance of a 1m long nichrome wire is 6 ohm . If we reduce the length of the wire to 70 cm . what will it's resistance be?
Answer» ANSWER: I HOPE you LIKE that DEAR

48.

The resistance of a 1m long nichrome wire is 6 ohm . If we reduce the length of the wire to 70 cm . what will it's resistance be?

Answer»

ANSWER:

I HOPE you LIKE that DEAR

Discussion

49.	The speed of the image of the second car as seen in the mirror
Answer» ANSWER: PLEASE WRITE FULL QUESTION.......

49.

The speed of the image of the second car as seen in the mirror

Answer»

ANSWER:

PLEASE WRITE FULL QUESTION.......

Discussion

50.	Two cars start out simultaneously from a point in the same direction, one of them going at a speed 50kmph and the other at 40kmph. In half an hour a third car starts out from the same point and overtakes the first car 1.5 hours after catching up with the second car. Find the speed of the third car.
Answer» 501/2=25m 401/2=20m CAR A IS BEHIND CAR B BY 5m CAR C OVERTAKES CAR B IN 3/2 hrs 25= Ubct+ 25=(UB-UC)3/2 50/3= 50-UC UC=100/3m/s

50.

Two cars start out simultaneously from a point in the same direction, one of them going at a speed 50kmph and the other at 40kmph. In half an hour a third car starts out from the same point and overtakes the first car 1.5 hours after catching up with the second car. Find the speed of the third car.

Answer»

50*1/2=25m

40*1/2=20m

CAR A IS BEHIND CAR B BY 5m

CAR C OVERTAKES CAR B IN 3/2 hrs

25= Ubct+

25=(UB-UC)3/2

50/3= 50-UC

UC=100/3m/s

Discussion

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