The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be ____kg

If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will

To project the rockets which of the following principle(s) is /(are) required?

By convention, the clockwise moments are taken as ___________ and the anticlockwise moments are taken as__________.

___________ is used to change the speed of car.

A man of mass 100 kg has a weight of ___________ at the surface of the Earth

Why a spanner with a long handle is preferred to tighten screws in heavy vehicles?

While catching a cricket ball the fielder lowers his hands backwards. Why?

How does an astronaut float in a space shuttle?

A ball of mass 1 kg moving with a speed of 10 ms^-1 rebounds after a perfect elastic collision with the floor. Calculate the change in linear momentum of the ball.

A mechanic unscrew a nut by applying a force of 140 N with a spanner of length 40 cm. What should be the length of the spanner if a force of 40 N is applied to unscrew the same nut?

The ratio of masses of two planets is 2:3 and the ratio of their radii is 4:7. Find the ratio of their accelerations due to gravity.

What are the types of inertia? Give an example for each type.