Physics

1Astronauts in orbit feel weightless because there is no gravity there.

2If the string of a whirling stone breaks, the stone moves

3Newton's law of universal gravitation states that the force between two masses is

4Doubling the distance between two masses reduces the gravitational force to one quarter.

5A body moving in a circle at constant speed is accelerating.

6A 1 kg mass moves in a circle of radius 1 m at 5 m/s. Find the centripetal force.

7The centripetal acceleration of a body moving at 4 m/s in a circle of radius 5 m is ___ m/s².

8The centripetal acceleration of a body moving at 2 m/s in a circle of radius 4 m is ___ m/s².

9The acceleration due to gravity on the Moon is about

10A wheel makes 4 revolutions in 2 s. Find its period.