(a(i))[3]
Explain, in terms of particles, why the air in the rocket exerts a pressure on the walls of the rocket.
(a(ii))[1]
The temperature of the air in the rocket stays constant while air is pumped in. Explain why increasing the number of air particles in the rocket increases the pressure of the air in the rocket.
(b)[3]
When the air pressure in the rocket is high, the rubber tubing is taken away from the rocket. The water in the rocket is expelled downwards. Explain, in terms of momentum, why the rocket begins to accelerate upwards.
(c)[2]
As water is expelled from the rocket, the rocket’s upward acceleration changes. Suggest two reasons for the change in the acceleration of the rocket.