Advertisements
Advertisements
प्रश्न
What is the momentum in kg.m/s of a 10 kg car travelling at (a) 5 m/s (b) 20 cm/s, and (c) 36 km/h ?
Advertisements
उत्तर
(a) 5 m/s
We know that:
Momentum = mass × velocity
= m × v
Here, mass, m = 10 kg
velocity, v = 5 m/s
Putting these values in the above formula, we get:
Momentum = 10 × 5 kg.m/s
= 50 kg.m/s
(b) 20 cm/s
We know that:
Momentum = mass × velocity
= m × v
Here, mass, m = 10 kg
velocity, v = 20 cm/s
v = 0.2 m/s
Putting these values in the above formula, we get:
Momentum = (10)(0.2) kg.m/s
= 2 kg.m/s
(c) 36 km/h
We know that:
Momentum = mass × velocity
= m × v
Here, mass, m = 10 kg
velocity, v = 36 km/h
= `36 xx 1000/3600`
= `36 xx 1000/3600`
= `36 xx 10/36`
= 10 m/s
Putting these values in the above formula, we get :
Momentum = 10 × 10 kg.m/s = 100 kg.m/s
APPEARS IN
संबंधित प्रश्न
Two objects, each of mass 1.5 kg are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m s−1 before the collision during which they stick together. What will be the velocity of the combined object after collision?
A hockey ball of mass 200 g travelling at 10 m s−1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 m s−1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.
Which physical principle is involved in the working of a jet aeroplane ?
Fill in the following blanks with suitable words :
Momentum is a _____________ quantity. Its unit is _____________.
A body of mass 2 kg is at rest. What should be the magnitude of force which will make the body move with a speed of 30 m/s at the end of 1 s ?
A gun of mass 3 kg fires a bullet of mass 30 g. The bullet takes 0.003 s to move through the barrel of the gun and acquires a velocity of 100 m/s. Calculate:
- the velocity with which the gin recoils.
- the force exerted on gunman due to recoil of the gun
State the law of conservation of momentum.
Why would an aircraft be unable to fly on the moon ?
A ball X of mass 1 kg travelling at 2 m/s has a head-on collision with an identical ball Y at rest. X stops and Y moves off. Calculate the velocity of Y after the collision.
A vessel at rest explodes into three pieces. Two pieces having equal masses fly-off perpendicular to one another with the same velocity 30 meter per second. The third piece has three times mass of each of other piece. The magnitude and direction of the velocity of the third piece will be
