1 You may sometimes find it difficult to get up from the sofa after watching a TV programme.
Assuming the force of gravity acts between the centre of your body and the centre of the sofa,
estimate the attraction between you and your sofa.
ON
2
Calculate the size of the gravitational pull of a sphere of mass 10 kg on a mass 2.0 kg
their centres are 200 mm apart.
What is the force of the 2.0 kg mass on the 10 kg mass?
when

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .

Which of the following describes how a microwave heats food

Which statement is true? a) the work done to lift an object 6 meters is greater than the gravitational potential energy it gains. b) the work required to push an object is less than the work required to pull an object the same distance. c) the work required to raise an object to a height is equal to the gravitational potential energy the object gains. d) the work done against gravity to lift an object straight up is greater than the work required to roll it up a ramp.