Fig. 2.1 shows a model fire engine with its brakes applied.
Every 6.0 s, 0.80 kg of water leaves in the jet at a speed of 0.72 m/s relative to the model.
(a)[2]
Calculate the change in momentum of the water ejected during 6.0 s.
(b)[2]
Calculate the size of the force on the model due to the water jet.
(c)[2]
State and explain the direction of the model’s acceleration.
(d)[3]
State and explain how the size of the initial acceleration changes if the brakes are first released when the tank is nearly empty.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Any correct form of $\Delta p = mv$ OR $0.8 \times 0.72$” …