67486 + Interview Questions in Secondary School in Physics

1.	Conclusions on galvanometer
Answer» Galvanometer is the historical name given to a moving coil electric currentdetector. When a current is passed through a coil in a MAGNETIC FIELD, the coil experiences a torqueproportional to the current. If the coil's movement is opposed by a coil spring, then the amount of deflection of a needle attached to the coil may be proportional to the current passing through the coil. Such "meter movements" were at the heart of the moving coil meters such as VOLTMETERS and ammeters until they were LARGELY REPLACED with solid state meters.

Discussion

2.	If weight of a book on surface of earth is 5 N . What will be its weight at a height equal to radius of earth
Answer» HOPE that this ANSWER will HELP you

Discussion

3.	Find the angular displacement of second hand of a clock in 45 second
Answer» ANGULAR displacement of SECOND hand 1 ONE minute=360 degree Angular displacement of second hand in 1 second=360/60=6 degree For 45 sec 6*45=270

Discussion

4.	What would be the change in tangential velocity of an electron, if it remains in same orbit and electronic charge is doubledHint:if v is proportional to square root of charge
Answer» ANSWER: $(\sqrt{<klux>2</klux>}-1)v$ Explanation: 1) We know that, Columbic force which PROVIDES centripetal acceleration to the electron is proportional to charge q of moving particle. (Here electron ) And centripetal acceleration is proportional to square of its velocity. 2) Moving swiftly to equations, we get $F_c \propto q\\ \\=>v^2 \propto q \\ =>v \propto \sqrt{q}$ 3) If charge gets doubled, Then, We have, v_i = INITIAL tangential velocity v_f = final tangential velocity $\frac{v_f}{v_i}=\frac{\sqrt{2q}}{\sqrt{q}}\\ \\=>v_f = \sqrt{2}v_i$ CHANGE in tangential velocity, $\Delta v=v_f-v_i\\ \\ =(\sqrt{2}-1)v_i$

4.

What would be the change in tangential velocity of an electron, if it remains in same orbit and electronic charge is doubledHint:if v is proportional to square root of charge

Answer»

ANSWER:

$(\sqrt{<klux>2</klux>}-1)v$

Explanation:

1) We know that,

Columbic force which PROVIDES centripetal acceleration to the electron is proportional to charge q of moving particle. (Here electron )

And centripetal acceleration is proportional to square of its velocity.

2) Moving swiftly to equations, we get

$F_c \propto q\\ \\=>v^2 \propto q \\ =>v \propto \sqrt{q}$

3) If charge gets doubled,

Then,

We have, v_i = INITIAL tangential velocity

v_f = final tangential velocity

$\frac{v_f}{v_i}=\frac{\sqrt{2q}}{\sqrt{q}}\\ \\=>v_f = \sqrt{2}v_i$

CHANGE in tangential velocity,

$\Delta v=v_f-v_i\\ \\ =(\sqrt{2}-1)v_i$

Discussion

5.	A sphere is suspended by a thread of length l. What min horizontal velocity is to be imparted to the sphere for it to reach the height of suspension
Answer» INITIAL kinetic ENERGY imparted to sphere = Potential energy at topmost point (i.e. height of suspension). Therefore, MGL = (1/2)mv2 , or v = SQRT (2GL)

Discussion

6.	Name some natural phenomena in which charges are seen.
Answer» Hii dear, # Production of charges- - In nature, charges are produced when objects are rubbed on each other. - During this process electrons MIGRATE from one body to another. - Body DONATING electrons is positively charged while body accepting electrons is negatively charged. # For example - rubbing COMB with hair will CREATE charges. - rubbing glass rod against silk cloth - rubbing ball PEN refill against woolen cloth Hope that helps you..

Discussion

7.	. A car has wheels of radius 0.30 m and is travelling at 36 m/s. Calculate :-(a) the angular speed of the wheel.(b) If the wheels describe 40 revolutions before coming to rest with a uniform acceleration.(i) find its angular acceleration and (ii) the distance covered
Answer» Do not PUT the VALUE of PIE it is EASY to SOLVE

Discussion

8.	A space vehicle of mass m is in a circular orbit of radius 2r
Answer» So what's the QUESTION in this I can't ABLE to UNDERSTAND.

Discussion

9.	A particle moving with kinetic energy K makes a head on elastic collision with an identical partical at rest. Find the maximum elastic potential energy of the system during the collision.
Answer» During the collision, KINETIC ENERGY may temporarily be stored as POTENTIAL energy

Discussion

10.	A convex mirror has a focal length of 18 centimetre the image of an object in front of the mirror is half the height of the object .what is the distance of the object from the mirror.( answer is 18 cm)
Answer» F=18 H2=1/2H1 2H2=H1 H2/H1=-V/U H2/2H2=-V/U 1/2=-V/U -2V=U BY APPLYING CONVEX MIRROR FORMULA 1/V+1/U=1/F 1/V-1/2V=1/18 BY TAKING LCM 2-1/2V=1/18 1/2V=1/18 2V=18 V=9 AND, IF U=2V SO, U=2*9 U=18cm

10.

A convex mirror has a focal length of 18 centimetre the image of an object in front of the mirror is half the height of the object .what is the distance of the object from the mirror.( answer is 18 cm)

Answer»

F=18

H2=1/2H1

2H2=H1

H2/H1=-V/U

H2/2H2=-V/U

1/2=-V/U

-2V=U

BY APPLYING CONVEX MIRROR FORMULA

1/V+1/U=1/F

1/V-1/2V=1/18

BY TAKING LCM

2-1/2V=1/18

1/2V=1/18

2V=18

V=9

AND, IF U=2V

SO,

U=2*9

U=18cm

Discussion

11.	A certain triple-star system consists of two stars, each of mass m, revolving in the same circular orbit of radius r around a central star of mass m (fig. 13-54).The two orbiting stars are always at opposite ends of a diameter of the orbit. Derive an expression for the period of revolution of the stars
Answer» The CENTRIPETAL force is obtained from the net GRAVITATIONAL force acting on the system. Thus, $F_{net} = F_c$ Substitute, $\frac {Gm}{r^2}[2M+\frac {m}{4}] = \frac {4\pi^2 mr }{T^2}$ Where G = Universal Gravitational Constant = $6.67408 \times 10^{-11}m^3 kg^{-1}s^{-2}$ T = PERIOD of revolution of the stars So, $T = \frac {\sqrt {16\pi^2 r^3}}{G[8M+m]}$ Therefore, the expression for the period of revolution of stars is $\frac {\sqrt {16\pi^2 r^3}}{G[8M+m]}$

11.

A certain triple-star system consists of two stars, each of mass m, revolving in the same circular orbit of radius r around a central star of mass m (fig. 13-54).The two orbiting stars are always at opposite ends of a diameter of the orbit. Derive an expression for the period of revolution of the stars

Answer»

The CENTRIPETAL force is obtained from the net GRAVITATIONAL force acting on the system.

Thus,

$F_{net} = F_c$

Substitute,

$\frac {Gm}{r^2}[2M+\frac {m}{4}] = \frac {4\pi^2 mr }{T^2}$

Where G = Universal Gravitational Constant = $6.67408 \times 10^{-11}m^3 kg^{-1}s^{-2}$

T = PERIOD of revolution of the stars

So,

$T = \frac {\sqrt {16\pi^2 r^3}}{G[8M+m]}$

Therefore, the expression for the period of revolution of stars is $\frac {\sqrt {16\pi^2 r^3}}{G[8M+m]}$

Discussion

12.	Think about Newton's 2nd Law, Force equals mass times acceleration. Liz puts a 1 kg weight and a 10 kg weight on identical wagons. She then applies a 10N force to each wagon. What will be true about the acceleration of the bottom wagon that has more mass?
Answer» The ANSWER is that gravity defends of the WIGHT of an object with it DISTANCE

Discussion

13.	Why are spokes fitted in a cycle wheel?
Answer» Spokes are fitted in cycle wheel to GIVE SUPPORT and STRENGTH to lift the WEIGHT of PERSON.

Discussion

14.	When's dot product becomes zero?
Answer» Hi. DOT PRODUCT MEANS that two vectors are related with a cos (cosine) trigonometric function. Hence, we can say that A(vector). B(vector) = ABcosQ. (Q= theta). Note, when Q= 90°, the VALUE of cosQ= 0. Hence, at Q= 90°, the value of dot product becomes zero. Just let me know in the COMMENTS, what do you think will be the maximum value of dot product. Mark as the BRAINLIEST. HOPE it Helps. Thanks

14.

When's dot product becomes zero?

Answer»

Hi.

DOT PRODUCT MEANS that two vectors are related with a cos (cosine) trigonometric function.

Hence, we can say that A(vector). B(vector) = ABcosQ. (Q= theta).

Note, when Q= 90°, the VALUE of cosQ= 0. Hence, at Q= 90°, the value of dot product becomes zero. Just let me know in the COMMENTS, what do you think will be the maximum value of dot product.

Mark as the BRAINLIEST.

HOPE it Helps.

Thanks

Discussion

15.	if the image of an object formed by a concave mirror is the half of the size of the object prove that the object is at a distance of 3f from the mirror where f is the focal length of the mirror.
Answer» Convex MIRROR has a FOCAL length f. ... If the focal length of a convex mirror is 3m and an OBJECT is placed at 5m, then what .... It's image is formed at a distance of 18CM from the mirror .

Discussion

16.	Work done by restoring force in a wire within elastic limit is -10j maximum amount of heat produced ?
Answer» As PER thermodynamics LAW, $\Delta Q=\Delta <klux>U</klux>+\Delta W$ where $\Delta Q heat energy absorbed/released, [tex]\Delta U is changed in internal energy and [tex]\Delta W is work done.Restoring force acts so quickly, there will be negligible heat loss. Hence we approximate this process as adiabatic and \Delta Q = 0Hence we have, [tex]\Delta U+\Delta W=0$ , since \Delta W = -10 J, we have \Delta U = 10 J.

16.

Work done by restoring force in a wire within elastic limit is -10j maximum amount of heat produced ?

Answer»

As PER thermodynamics LAW, $\Delta Q=\Delta <klux>U</klux>+\Delta W$

where $\Delta Q heat energy absorbed/released, [tex]\Delta U is changed in internal energy and [tex]\Delta W is work done.Restoring force acts so quickly, there will be negligible heat loss. Hence we approximate this process as adiabatic and \Delta Q = 0Hence we have, [tex]\Delta U+\Delta W=0$ , since \Delta W = -10 J, we have \Delta U = 10 J.

Discussion

17.	A block placed on a horizontal surface is being pushed by a force f making an angle
Answer» its ANSWER....................

Discussion

18.	What is thermometry ? Give an exampleof thermometric substance?
Answer» Thermometry is a branch of physics which deals with the MEASUREMENT of temperature. The device which is used to measure the temperature is CALLED thermometer. Types of thermometer are: Liquid thermometer Gas thermometer Resistance thermometer Magnetic thermometer Radiation thermometer Thermoelectric thermometer Examples of thermometric properties: LENGTH of a column of liquid, e.g.mercury and alcohol thermometers. Electrical resistance.. Hope your problem has been solved... If RIGHT plz mark me as Brainliest.....

Discussion

19.	The power of a water pump is 2 kilowatt it is equal to 10 m per second square what amount of water can be traced in one minute to a height of 10m
Answer» Power = 2 KW = 2000 W G= 10m/ s^2 h = 10m Power = Energy / Time Power = mgh / Time 2000 W = m × 10 × 10 / 10 m = 2000 / 10 L m= 200 L Hope your PROBLEM has been solved.... If right plz mark me as Brainliest.....

Discussion

20.	Please please brain lest answer too. please please help me out tomorrow I have exam.
Answer» When he clicked both the MARBLES in WOOD. Then the SOUND will produce more. From this we can conclude this Sound travel more and faster in SOLID than other medium. hope its helps u If right plz MARK me as Brainliest

Discussion

21.	Why does a sound wave cannot transmit in the vacuum?
Answer» Sound cannot you TRANSLATE in the vacuum because it needs a MEDIUM to travel. HOPE U LIKE MY ANSWER...

Discussion

22.	What is the symbol of wavelength and frequency????
Answer» The SYMBOL of wave length is LAMBDA and symbol of frequency is (F)

Discussion

23.	A particle starts from rest and accelerates at constant rate of 5m/s2 fin the distance travelled in 4 seconds
Answer» ACCORDING to the EQUATIONS of motion $s = ut + \frac{1}{2} a {t}^{2}$ $s = 0 \times 4 + \frac{1}{2} \times 5 \times {4}^{2}$ $s = 40$ So distance=40m

Discussion

24.	What is pitch? Name the unit of physical quantity on which pitch depends?
Answer» The pitch of a sound refers to WHETHER it is high (sharp), like the sound of a violin, or low, like the sound of a bass drum. The physical quantity that determines pitch is the frequency. The HIGHER the frequency, the higher the pitch. Hope your PROBLEM has been solved. If RIGHT plz mark me as Brainliest..

Discussion

25.	Even after sunset, the air near the earth's surface continued to receive heat due to
Answer» Terrrstial Radiation. hope its HELPS u If right PLZ MARK me as Brainliest

Discussion

26.	A turn out is to be laid off a straight BG track with a 1 in 11 crossing. Determine the lead and radius for the turn out, given the following data. Heel divergence d = 113 mm, the straight length between the TNC and the tangent point of the crossing curve, h = 1.325m, crossing angle α = 3°25’40'and switch angle β = 1°8’20'.
Answer» ............... .. ...

Discussion

27.	Plz tell me the speed of light
Answer» 卄乇ㄚ千尺丨乇几ⅅ $3 \times 10 {}^{8} m \: per \: sec$ Hope it HELPS you

Discussion

28.	A uniform magnetic field in the direction east to west is applied on a straight cureent carrying conductor what will be the direction of conductor
Answer» The CONDUCTOR will be be in NORTH as per Fleming Left Hand rule.. Hope its helps u.... If RIGHT PLZ mark me as BRAINLIEST...

Discussion

29.	Explain how Newton arrived at his law of gravitation from kepler's third law.
Answer» The in Kepler's 3RD law refers to the length of the semi-major axis of a planet's ELLIPSE. Newton was ABLE to show in his Principia, published in 1687, that this law COMES about as a natural consequence of his laws of motion and his law of gravity. Hope its helps U If right plz mark me as Brainliest

Discussion

30.	Is there any other satellite having same rotation time on its axis as moon
Answer» No it can't possibl because BEHIND MOON the mars is too far from it. so the attraction of mars is less than the attraction of earth so the SATELLITE can't fix there

Discussion

31.	If the velocity the particle is doubled then the ratio of kinetic energy is
Answer» FOUR TIMES will be the KINETIC

Discussion

32.	a block of mass 2 kg moving at a speed of 10 m per second accelerate at 3M per second square for 5 seconds compute its final kinetic energy
Answer» V = u + at 10 + 3×5 10+ 15 = 25 m/ s $k.e = \frac{1}{2} mv {}^{2} \\ \frac{1}{2} \times 2 \times {25}^{2} \\ = 625 \: joules$ If RIGHT PLZ mark me as BRAINLIEST

Discussion

33.	Difference between line commutation and forced commutated inverter
Answer» Hii dear, # DIFFERENCE between NATURAL(line) commutation and forced commutation # Natural(line) commutator- - requires Ac input - no external components REQUIRED - used in controll rectifiers, AC voltage controller - no power LOSS - zero cost - SCR turns off due to CURRENT voltage supply # Forced commutation- - requires DC input - external components required - used in choppers, inveeters - power loss - significant cost - SCR turns off due to current and voltage both - Hope you got it.

Discussion

34.	The two charges 3.2×10-19c and -3.2×10-19c are placed 2.4 a apart from an electric dipole it is placed in a uniform electric field of intensity
Answer» The value of ELECTRIC FIELD intensity is 4.9 x 10^-10 N / C Explanation: Given data: Q1 = 3.2×10-19 C q2 = -3.2×10-19 C Distance between charged "d" 2.4 m As we know that F = Kq1q2 / d^2 E = F / Q E = Q1 / 4πεod^2 E = 3.2×10-19 / 4 x 3.14 x 8.854 × 10^-12 (2.4)^2 E = 3.2 x 10^-19+12 / 4 x 3.14 x 8.854 x 5.76 E = 3.2 x 10^-7 / 640.55 E = 0.0049 x 10^-7 E = 4.9 x 10^-3-7 = 4.9 x 10^-10 N / C Thus the value of electric field intensity is 4.9 x 10^-10 N / C Also learn more Find the MAGNITUDE of the electric field at a point 4 cm away from a line charge of density 2*10-6 C/ m? brainly.in/question/3734396

34.

The two charges 3.2×10-19c and -3.2×10-19c are placed 2.4 a apart from an electric dipole it is placed in a uniform electric field of intensity

Answer»

The value of ELECTRIC FIELD intensity is 4.9 x 10^-10 N / C

Explanation:

Given data:

Q1 = 3.2×10-19 C

q2 = -3.2×10-19 C

Distance between charged "d" 2.4 m

As we know that

F = Kq1q2 / d^2

E = F / Q

E = Q1 / 4πεod^2

E = 3.2×10-19 / 4 x 3.14 x 8.854 × 10^-12 (2.4)^2

E = 3.2 x 10^-19+12 / 4 x 3.14 x 8.854 x 5.76

E = 3.2 x 10^-7 / 640.55

E = 0.0049 x 10^-7

E = 4.9 x 10^-3-7 = 4.9 x 10^-10 N / C

Thus the value of electric field intensity is 4.9 x 10^-10 N / C

Also learn more

Find the MAGNITUDE of the electric field at a point 4 cm away from a line charge of density 2*10-6 C/ m?

brainly.in/question/3734396

Discussion

35.	Who is father of physic
Answer» HEY FRIEND Here is your ANSWER:- EINSTEIN..............✔✅ Thanks☺ Hope it helps✌

Discussion

36.	Define reciprocal leveling
Answer» Levelingbetween two widely separated points in which observations are made in both directions to eliminate the EFFECTS of atmospheric refraction and the curvature of the earth. (or) A levelling PROCEDURE used when long SIGHTS are required (over rivers, RAVINES, or obstacles) to minimize COLLIMATION,

Discussion

37.	Which other procedures will you suggest to study Newton's Laws of motion in the Laboratory?
Answer» Newton's first law EXPLAINS the concept of inertia, which is the tendency of objects to resist changes in motion. Today, we're going to see how the mass of an object influences its inertia. If you need to read up on inertia, you can do that in this lesson: LAWS of Inertia: Definition & Formula. Materials Paper towel tube Pie plate 12-ounce glass 12 ounces of water Extra LARGE egg Small egg (still large enough to fit on TOP the paper towel tube) Access to running water and soap Balance Data table: Mass of eggObservations Steps 1. Take the mass of both EGGS and record this in your data table. 2. Fill your glass with 6 ounces of water. 3. Center the pie plate on top of the glass. 4. Next, center the paper towel tube vertically on top of the pie plate. 5. Gently place the smaller egg on the paper towel tube, making sure it sits on top of the tube. Experiment setup 5. You're going to smack the pie plate out from under the paper towel tube and egg. You won't touch the paper towel tube or the egg, only the pie plate. You might need to try this more than once to apply to appropriate force. 6. Repeat steps 2-5 with the larger egg and observe any differences compared to the small egg. Safety Tip!! Raw eggs may contain pathogens. 7. If there are any breaks to your eggs, wash your hands and carefully clean up the spill with a cleaning product. PLEASE MARK MY ANSWER AS A BRAINLIEST ANSWER.

Discussion

38.	Prove that max. Horizontal range is 4 times of height attained by particle
Answer» This is the proof. Hope this MAY HELP you.

Discussion

39.	If the distance between two particles is increased by 2%,then the force of attraction between them will decrease by what %?
Answer» We know, gravitational force or Coulomb's force both is inversely PROPORTIONAL to SQUARE of distance between PARTICLES . e.g., $F\propto\frac{1}{r^2}$ so, F = K/r² , K is proportionality constant. differentiate both sides with respect to r dF/dr = -2K/r³ dF = -2Kdr/r³ dF/F = -2Kdr/r³F dF/F = -2Kdr/r³ × (K/r²) = -2dr/r To find MAXIMUM ERROR , ∆F/F = 2 × ∆r/r so, % error in F = 2 × % error in r given, % error in r = 2% so, % error in F = 2 × 2 = 4%

Discussion

40.	A torch bulb iscrated 5v and 500 ma calculate power of bulb and resistance of bulb
Answer» Hey MATE ^_^ ======= Answer: ======= Given : POTENTIAL difference = 5V Current = 500mA = 500x / 1000A = 0.5A i) Power of BULB = V × I = 5 × 0.5 = 5 x 5/10 = 2.5 W ii) Resistance = R = ? By Ohm's law: V = IR R = V/I R = 5/0.5 = 50/5 = 10 Ω #Be Brainly❤️

Discussion

41.	An electric heater is raised 1500 w .How much energy does use in 10 hours
Answer» P=1500w=1.5kW t=10 hrs Electrical energy=P×t =1.5×10=150 KWH

41.

An electric heater is raised 1500 w .How much energy does use in 10 hours

Answer»

P=1500w=1.5kW

t=10 hrs

Electrical energy=P×t

=1.5×10=150 KWH

Discussion

42.	Find the energy possessed by an object of mass 10 kg when it is at the height of 6 metre above the ground
Answer» Mass of the object, m = 10 kg Height of the object, h = 6 m Acceleration due to gravity, G = 9.8m/s2 potential energy = MGH = 10×9.8×6 = 588J

Discussion

43.	A pair of bullocks exerts a force of 140n on a plough the fieldbeing ploughed is 15m long how much work is done in ploughing the length of the field
Answer» Work=force X displacement so W= 140x 15 work DONE is 2100 JOULES

Discussion

44.	A proton moving with constant velocity passes through a region without any change in its velocity. If e and b denote electric and magnetic field respectively, this region must not have
Answer» E=0 ,b=0 while electric FIELD ACCELERATES the charged particle or PROTON in this case MAGNETIC field changes its direction and since the VELOCITY is unchanged that is proton does not change accelerator change in its direction of motion so and b is equal to zero

Discussion

45.	Sound waves in air can not be polarised because they area. Transverseb. Progressive c. Longitudinal d. Stationary
Answer» Sound waves are LONGITUDINAL that is why it can't be POLARIZED in AIR.

Discussion

46.	A very thin strip of width b carries a current i along its length
Answer» What's your QUESTION DEAR...........

Discussion

47.	Which wavelength of the harmful UV radiation is prevented by Ozone Layer from entering the earth's atmosphere.a. 200-310nmb. 400-700 nmc. 320-400nmd. more than 700 nm
Answer» A) 200 to 310 NM........

Discussion

48.	Proof that the kinetic energy of a body of mass M moving with velocity V is given by half Mv square
Answer» Here is your answer MATE... HOPE IT HELPS!! PLZ RATE BRAINLIST!! ✌️

Discussion

49.	No useless answer full explanation
Answer» Hey mate here is your answer!! ☝️ The SECOND part needs displacement.... Which is not given.... So it can not be ditermined... HOPE IT HELPS!! PLZ RATE BRAINLIST!! ✌️

Discussion

50.	a body of mass 2kg is dropped from the top of a tower of 100 m height. calculate the time taken to reach the ground. (take g= 10m/s2)
Answer» $\bold{Hey \: mate \: here \: is \:your \: ANSWER}$ $\large{\red{\boxed{\mathbb{HOPE \:IT \:HELPS}}}}$ $PLEASE MARK AS BRAINLIEST$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Conclusions on galvanometer

If weight of a book on surface of earth is 5 N . What will be its weight at a height equal to radius of earth

Find the angular displacement of second hand of a clock in 45 second

What would be the change in tangential velocity of an electron, if it remains in same orbit and electronic charge is doubledHint:if v is proportional to square root of charge

A sphere is suspended by a thread of length l. What min horizontal velocity is to be imparted to the sphere for it to reach the height of suspension

Name some natural phenomena in which charges are seen.

. A car has wheels of radius 0.30 m and is travelling at 36 m/s. Calculate :-(a) the angular speed of the wheel.(b) If the wheels describe 40 revolutions before coming to rest with a uniform acceleration.(i) find its angular acceleration and (ii) the distance covered

A space vehicle of mass m is in a circular orbit of radius 2r

A particle moving with kinetic energy K makes a head on elastic collision with an identical partical at rest. Find the maximum elastic potential energy of the system during the collision.

A convex mirror has a focal length of 18 centimetre the image of an object in front of the mirror is half the height of the object .what is the distance of the object from the mirror.( answer is 18 cm)

Think about Newton's 2nd Law, Force equals mass times acceleration. Liz puts a 1 kg weight and a 10 kg weight on identical wagons. She then applies a 10N force to each wagon. What will be true about the acceleration of the bottom wagon that has more mass?

Why are spokes fitted in a cycle wheel?

When's dot product becomes zero?

if the image of an object formed by a concave mirror is the half of the size of the object prove that the object is at a distance of 3f from the mirror where f is the focal length of the mirror.

Work done by restoring force in a wire within elastic limit is -10j maximum amount of heat produced ?

A block placed on a horizontal surface is being pushed by a force f making an angle

What is thermometry ? Give an exampleof thermometric substance?

The power of a water pump is 2 kilowatt it is equal to 10 m per second square what amount of water can be traced in one minute to a height of 10m

Please please brain lest answer too. please please help me out tomorrow I have exam.

Why does a sound wave cannot transmit in the vacuum?

What is the symbol of wavelength and frequency????

A particle starts from rest and accelerates at constant rate of 5m/s2 fin the distance travelled in 4 seconds

What is pitch? Name the unit of physical quantity on which pitch depends?

Even after sunset, the air near the earth's surface continued to receive heat due to

Plz tell me the speed of light

A uniform magnetic field in the direction east to west is applied on a straight cureent carrying conductor what will be the direction of conductor

Explain how Newton arrived at his law of gravitation from kepler's third law.

Is there any other satellite having same rotation time on its axis as moon

If the velocity the particle is doubled then the ratio of kinetic energy is

a block of mass 2 kg moving at a speed of 10 m per second accelerate at 3M per second square for 5 seconds compute its final kinetic energy

Difference between line commutation and forced commutated inverter

The two charges 3.2×10-19c and -3.2×10-19c are placed 2.4 a apart from an electric dipole it is placed in a uniform electric field of intensity

The value of ELECTRIC FIELD intensity is 4.9 x 10^-10 N / C

Who is father of physic

Define reciprocal leveling

Which other procedures will you suggest to study Newton's Laws of motion in the Laboratory?

Prove that max. Horizontal range is 4 times of height attained by particle

If the distance between two particles is increased by 2%,then the force of attraction between them will decrease by what %?

A torch bulb iscrated 5v and 500 ma calculate power of bulb and resistance of bulb

An electric heater is raised 1500 w .How much energy does use in 10 hours

Find the energy possessed by an object of mass 10 kg when it is at the height of 6 metre above the ground

A pair of bullocks exerts a force of 140n on a plough the fieldbeing ploughed is 15m long how much work is done in ploughing the length of the field

A proton moving with constant velocity passes through a region without any change in its velocity. If e and b denote electric and magnetic field respectively, this region must not have

Sound waves in air can not be polarised because they area. Transverseb. Progressive c. Longitudinal d. Stationary

A very thin strip of width b carries a current i along its length

Which wavelength of the harmful UV radiation is prevented by Ozone Layer from entering the earth's atmosphere.a. 200-310nmb. 400-700 nmc. 320-400nmd. more than 700 nm

Proof that the kinetic energy of a body of mass M moving with velocity V is given by half Mv square

No useless answer full explanation

a body of mass 2kg is dropped from the top of a tower of 100 m height. calculate the time taken to reach the ground. (take g= 10m/s2)