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Answer:

The hydrometer works on the principle that a solid body DISPLACES its own weight of the LIQUID in which it floats. The hydrometer will FLOAT slightly higher in salt water because salt water is more dense that “PURE” water.

ANSWER:

EXPLAIN the MATERIALS that can be charged with static electricity

Explanation:

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as VELOCITY of light is 3*10^8 m/s

acceleration=10m/s^2

we know that

acceleration=velocity/time

time=velocity/acceleration

=(m/s)/(m/s^2)

=s

therefore UNIT of time is second represented by 's'

average velocity=TOTAL displacement /total time taken

average speed=total distance/total time taken

since OBJECT is moving in a straight LINE therefore

distance=displacement

time is same for both the cases

therefore

avg speed=avg velocity

avg speed/avg velocity=1/1

therefore they are in the RATIO of 1:1

Answer:

Explanation:

A lift starts from rest at t = 0 and moves upwards with constant acceleration of 5 m/s2. At t = 2 s, a bolt  from the ceiling of lift DETACHES and falls freely. If height of lift is 7.5 m, then the bolt hits the FLOOR of lift at  1= ns. Find the value of n. (G = 10 m/s2)​

Lift starts from rest

u = 0 m/s

after t = 2sec

a = 5 m/s²

v = u + at = 0 + 5*2 = 10 m/s

Bolt hits the floor in n sec

Bolt initial speed = 0 m/s

a = 10 m/s²

S = ut + (1/2)at²

=> S bolt = 0 + (1/2)(10)n²

=> S bolt = 5n²

SLift = 10n + (1/2)5n²

=> SLift = 10n + 2.5n²

S bolt + Slift = 7.5

=> 5n² + 10n + 2.5n² = 7.5

=> 7.5n² + 10n  - 7.5 = 0

=>  3n² + 4n - 3 = 0

=> n = 0.535 sec

Answer:

0.0125

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Answer:

Explanation:

High speed trains in india are Gatimaan EXPRESS, New Delhi - Bhopal ... of upto 160 km/hr and SPANISH Talgo Train with a maximum speed of 180 km/hr. ... 2. New Delhi - Bhopal Shatabdi Express, 12002. The Bhopal ... now it takes 15 hours 50 minutes at an average speed of 90.46 km/hr (excluding HALTS).

According to Huygens principle of LIGHT is a FORM of __

Answer

Christian Huygens firstly PROPOSED the WAVE theory of light .According to him ,

Huygens principle of light is a form of wave

His principle SAYS that light acts or behaves as a wave

Answer:

NICE qiestion but i CANT GIVE answere

ANSWER:

The acceleration of a BODY is due to change in its velocity with respect to TIME.

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THANK you

Answer:

The FIRST scientist who proposed WAVE theory of light is

CRISTIAAN HUYGENS

ANSWER: P=VI

I= P/V

EXPLANATION:

IN FIRST CASE = 840/220=3.8A

IN 2ND CASE =360/220==1.6A

ANSWER:

INERTIA is TGE PROPERTY...m

EXPLANATION:

I don't KNOW the ANSWER

ANSWER:

SPEED as it is SCALER.

EXPLANATION:

ANSWER:it is because as we know that ,the mass of the large stone is often more than the smaller ONE.the effect of the attraction of the earth on a BIGGER stone can be observed more than the effect of attraction of the earth on a smaller one.hence it is DIFFICULT to lift a large stone than the smaller one on the earth surface.

Explanation:

let TIME TAKEN by pankaj be t

then time taken by KAMLESH is t+2

distance =40 km

initial speed of kamles=u

final speed of kamlesh=2u

new time taken by kamlesh=t-1

u=40/t+2

or

2u=80/t+2

also

2u=40/t-1

equating the 2 equations

80/t+2=40/t-1

t=4 hr

therefore speed of kamlesh is

u=40/t+2

=40/6

=20/3 km/hr

ANSWER:

Principles Of Electromagnetic INDUCTION. Faraday's Law of Electromagnetic induction is the PROCESS in which an ELECTROMOTIVE force (emf) is induced in a closed circuit DUE to changes in the magnetic field around the circuit.

ANSWER:

AVERAGE SPEED = v+u/2

=30+20/2

=50/2

=25

Answer:

W =VQ

q=0

so v is also 0 so WORK DONE is 0

The GRAVITY BULB of hydrometer is made heavier. The gravity bulb of hydrometer is made heavier so that its centre of gravity remains very low, when it is floating in denser LIQUIDS. It helps the hydrometer to FLOAT UPRIGHT in stable equilibrium.

ANSWER:

feel free to ASK if any CONFUSION OCCURS...

as velocity of light is 3*10^8 m/s

acceleration=10m/s^2

we know that

acceleration=velocity/time

time=velocity/acceleration

=(m/s)/(m/s^2)

=s

therefore UNIT of time is SECOND REPRESENTED by 's'

VELOCITY of car A, = 72 km/h = 72 × 5/18 = 20 m/s

velocity of car B, = 36 km/h = 36 × 5/18 = 10 m/s

Distance between Car A and car B , = 25m

deceleration of car A, = -2m/s²

Let after time t, car B will catch up car A.

USING relative formula,

when car B catches up the car B,

so, 0 = 25 + (10)t + 1/2(-2)t²

or, 25 + 10t - t² = 0

or, t² - 10t - 25 = 0

or, t = {10 ± √(100 + 25×4)}/2

or, t = (5 ± 5√2) but t ≠ (5 - 5√2)s because (5 - 5√2) is negative value and time can't be negative.

so, t = (5 + 5√2)s

ANSWER:

Total distance COVERED =200m

total TIME TAKEN =20s+30s

Answer:

The shapes of the POSITION versus time graphs for these two basic types of motion - constant velocity motion and accelerated motion (i.e., changing velocity) - reveal an IMPORTANT principle. The principle is that the slope of the line on a position-time graph REVEALS useful information about the velocity of the object.

When a body moves along circular path then direction of motion KEEPS changing continuously.So if an ATHELETE moves with constant SPEED along circular path then velocity(speed) will not be constant because velocity is the speed in specified direction  and here direction of speed CHANGES constantly.Since the velocity changes(due to continuous CHANGE in direction )

therfore motion along circular path is said to be acclerated.

-21

-112

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Answer:

FORCE is PULL or PUSH which changes or tends to change the dimensions of the object or produces or tends to produce acceleration in that object.

Pressure is the amount of the force acting PER unit AREA.

ANSWER:

EXPLANATION:

when ELECTRICITY PASS through the CIRCUIT.

Explanation:

An AMMETER measures the ELECTRIC current in a circuit. The name is derived from the name for the SI unit for electric current, amperes (A). In order for an ammeter to MEASURE a device's current, it MUST be connected in series to that device.

Answer:

-0.555 m/s^2

Explanation:

According to the GIVEN question,

u = initial velocity = 40 km/h = 40×1000/3600 = 11.1 m/s

t = time = 20 sec

v = FINAL velocity = 0 m/s

a = acceleration and -a = deceleration

And we are asked to find the RETARDATION or deceleration of the vehicle.

We know,

• v = u+at

Putting the values we get

• 0 = 11.1+ 20 a

• 20a = -11.1

• a = -11.1/20

• a = - 0.555 m/s^2

Thus declaration of the vehicle should be 0.5 m/s^2 (approx) in 20 sec to stop the vehicle TRAVELING with 40 km/h .

Means acceleration should be -0.5 m/s^2.

CONVEX LENSE is the ANSWER

Answer:

draw parallel to it and CUT the LINE CROSS . MARK the two MEETING point and it will pause opposite .

Hey MATE here is your answer!!

Answer:

The maximum and minimum FOCAL LENGTHS of eye lenses are 2.5 cm and 2.27 cm respectively.

hope this helps you!!

LET MASS of iron ball = m

At height = 1km =1000m, 

TOTAL energy = potential energy = mgh = 1000*9.8*m = 9800m J =9.8m kJ

When all energy is converted into heat and used in raising the temperature of ball,

Specific heat of iron(s) = 0.1 kcal/kg C = 0.42 kJ/kg C 

Let change in temperature = ΔT

ms(ΔT) = mgh

⇒ms(ΔT) = 9.8m

⇒ s(ΔT) = 9.8

⇒ 0.42(ΔT) = 9.8

⇒ ΔT = 9.8/0.42 = 23.3 degree celsius

<P>Answer:

dioptre

Explanation:

t is equal to the reciprocal of the focal length of the device: P = 1/f. HIGH optical POWER CORRESPONDS to SHORT focal length. The SI unit for optical power is the inverse metre (m−1), which is commonly called the dioptre.

ANSWER:

resistance = 40.8 OHM

Explanation:

the length = 100m

diameter = 1mm = 0.001m

radius = 0.0002m

area of CROSS section = 0.00000004π m

resistance =

(1.7 *10^-8 *100)/0.00000004 ohm

=(1.7*10^10 ) /4*10^8 ohm

=(1.7*100)/4 ohm

= 40.8 ohm

Answer:

DISPLACEMENT- time GRAPH represent how the position of body is CHANGING w.r.t. time and slope of this graph gives VELOCITY.

EXPLANATION:

you can UNDERSTAND why

in COPPER ROD is the RIGHT ANSWER of this QUESTION

ANSWER:

1:2 is the answer because when the a and B equal

Explanation:

HOPE this will HELP

ferron524 Ambitious

Aim: to prove liquid exerts pressure

Materials REQUIRED: a GLASS test tube with open end, balloon,WATER

Procedure: tie a balloon to the lower end of the test tube hold the tube vertically and pour some water into it. you will see the rubber membrane bulges out. now add more water

the rubber membrane bulges more.

Conclusion: so this concludes that pressure exerted by a liquid increases with the height of the liquid COLUMN

EXPLANATION:

the GIVEN,

V=45km/hr

=12.5m/s

t=(1*60*60*)+(1*60)+(1)

=3661sec.

we KNOW,

d=V*t

=12.5*3661

=45762.5m

GIVEN, vector N^ = a i + B j is perpendicular to the vector (i + j).

we have to find value of a and b.

we know,

when two vectors A and B are perpendicular to each other then dot product of A and B = A.B = 0

similarly, vectors n^ = (a i + b j) and (i + j) are perpendicular to each other so, (a i + b j ).(i + j) = 0

or, a + b = 0.....(1)

we know, n^ denotes unit vector.

so, MAGNITUDE of n^ = 1

or, √(a² + b²) = 1

or, a² + b² = 1 .....(2)

from equation (1),

a² + (-a)² = 1

or, 2a² = 1

or, a = ±1/√2 and then, b = -a = 1/√2

hence, if a = 1/√2 then, b = -1/√2

and if a = -1/√2 then, b = 1/√2

Geysor is a long narrow, VERTICAL cavity formed in earth crust into which underground WATER SEEPS. here the water column is heated by volcanic HEAT at where the temperature is more than 100 degree CELSIUS .

*this is the working of natural geysor*.....

hope u understand it

Answer:

  The highest temperature is proportional to the highest VOLUME of the gas during the transition from one state to another.

Explanation:

The ideal gas equation is :  P V = N R T     ---- (1)

with the usual meanings to the symbols in there.

Given P = p₀ a V          ---- (2)

that means that pressure is DIRECTLY proportional to the volume. It means that when pressure of the gas is altered, the temperature changes in such a way that both (1) and (2) are satisfied.

 So    p₀ a V * V = n R T

 =>  T = [ p₀ a /(n R)] V²

When pressure is increased, the volume is increased and the temperature is increased too. The gas absorbs energy from the ENVIRONMENT or the energy source. There is work done on the gas and there is an increase in the internal energy of the gas too.

When the gas changes from (P1, V1, T1) to (P2, V2 , T2) in such a way that T2 > T1, then T2 is the highest temperature.

    T_max = [ p₀ a /(n R) V²_max

This is the answer.

Answer:

because bullets GOES forward as it have forces ACTING on it.