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qUESTIONS

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s2, the reading of the spring balance will be

A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively

A particle of mass m is at rest at the origin at time t = 0. It is subjected to a force F(t) = Foe^-bt in the x direction. Its speed v(t) is depicted by which of the following curves

A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is

A body of mass m = 3.513 kg is moving along the x-axis with a speed of 5.00 m/s. The magnitude of its momentum is recorded as

If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that

A machine gun fires a bullet of mass 40 g with a velocity 1200 ms1. The man holding it can exert a maximum force of 144N on the gun. How many bullets can he fire per second at the most

The figure shows the position – time (x-t) graph of one- dimensional motion of a body of mass 0.4 kg. The magnitude of each impulse is

A rocket with a lift-off mass 3.5×10^4 kg is blasted upwards with an initial acceleration of 10 m/s2. Then the initial thrust of the blast is

The mass of a hydrogen molecule is 3.32×10^-27 kg. If 10^23 hydrogen molecules strike, per second a fixed wall of area 2 cm2 at an angle of 45° to the normal, and rebound elastically with a speed of 10^3 m/s, then the pressure on the wall is nearly

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