Q41 of 124 Page 76

The rocket work on the principle of conservation of:

A. Mass B. Energy


C. Momentum D. Velocity

When exhausted gas moves downward, they provide equal amount of force on the rocket in upward direction, therefore rocket gets the thrust in upward direction.

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40

If a balloon filled with air and its mouth unties, is released with its mouth in the downward direction, it moves upwards. Why?

 40

An unloaded truck weighing 2000 kg has a maximum acceleration of 0.5 m/s2. What is the maximum acceleration when it is carrying a load of 2000 kg?

 42

An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a frictionless horizontal table. The force required to keep this object moving with the same velocity is:

A. 32 N B. 0 N


C. 2 N D. 8 N

 43

The physical quantity which makes it easier to accelerate a small car than a large is measures in the unit of:

A. m/s B. kg


C. kg m/s D. kg m/s2