1. A ball of mass 0.1 kg, initially at rest, is dropped from height of 1 m. Ball hits the ground and bounces off the ground. Upon impact with the ground, its velocity reduces by 20%. The height (in m) to which the ball will rise is:
1) 0.61
2) 0.62
3) 0.63
4) 0.64
2. A mass m1of 100 kg travelling with a uniform velocity of 5 m/s along a line collides with a stationary mass m2of 1000 kg. After the collision, both the masses travel together with the same velocity. The coefficient of restitution is:
1) 0.6
2) 0.1
3) 0.001
4) 0
3. A fighter plane flying in the sky dives with a speed of 120 m/sec in a vertical circle of radius of 100 m. Mass of the pilot is 80 kg. Force with
which the pilot presses the seat at the highest position is :
1) 10720 N
2) 15000 N
3) 8000 N
4) 12720 N
4. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base,
is __________ than that passing through its C.G. and parallel to the base.
1) Nine times
2) Six times
3) Four times
4) Two times
5. A simple pendulum of length of 5 m, with a bob of mass 1 kg, is in simple harmonic motion. As it passes through its mean position, the bob has