Calculate the resultant force needed to make a mass of 160 kg accelerate at $0.35\,\text{m s}^{-2}$.
Calculate the speed of the astronaut after 1.2 s.
The resultant force acting on the astronaut is constant for 1.2 s, but after that it drops to zero at once when the rope becomes slack. On Fig. 9.2, sketch the speed-time graph for the astronaut for the first 3.0 s of his motion.
Describe how the distance travelled by the astronaut in the first 3.0 s can be determined from the speed-time graph.
A force acts on the space station to keep it in this orbit. On Fig. 9.3, draw an arrow to show the direction of this force. Explain what causes this force.
State what is meant by the velocity of an object.
State and explain what happens during the orbit to (1) the velocity of the space station, and (2) the kinetic energy of the space station.