Test Preparation on Physics - Newton's Laws and Motion

1.

A ship of mass 3 x 107 kg initially at rest is pulled by a force of 5 x 104 N through a distance of 3 m. Assume that the resistance due to water is negligible, the speed of the ship is :

11.5 m/s
260 m/s
30.1 m/s
45 m/s

2.

A young man of mass 60 kg stands on the floor of a lift which is accelerating downwards at 1 m/s2 then the reaction of the floor of the lift on the man is: (Take g = 9.8 m/s2)

1528 N
2540 N
3546 N
4none of these

3.

A block of mass M is kept on a smooth inclined plane of inclination q. The force exerted by the plane on the block has a magnitude:

1mg/cosq
2mg
3mg tan q
4mg cos q

4.

A block of mass M is suspended by a string A from the ceiling and another string B is connected to the bottom of the block. If B is pulled on steadily :

1A breaks earlier than B
2B breaks earlier than A
3both break simultaneously
4not possible to say which one will break earlier

5.

A machine gun fires 10 bullets per second, each of mass 10 g, the speed of each bullet is 20 cm/s, then force of recoil is :

1200 dyne
22000 dyne
320 dyne
4none of these

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