9709 · topic questions
Energy, work and power
12 past-paper questions on Energy, work and power
A car of mass 1700kg is pulling a trailer of mass 300kg along a straight horizontal road. The car and trailer are connected by a…
(b) Use an energy method to find the speed of the particles at the instant when they are at the same vertical height.
A block of mass 20kg is held at rest at the top of a plane inclined at 30° to the horizontal. The block is projected with speed…
The car now travels at a constant speed up a hill inclined at an angle of sin¯¹0.15 to the horizontal. Find the greatest possible…
It is given instead that the plane BC is rough. The work done against the frictional force when Q moves 2m down the plane is 1.8…
A train of mass 180000kg ascends a straight hill of length 1.5km, inclined at an angle of 1.5° to the horizontal. As it ascends…
When the lorry has reached a speed of 20 ms⁻¹, it begins to ascend a section of road inclined at an angle α° to the horizontal.…
A cyclist and bicycle have a total mass of 72kg. The cyclist rides along a horizontal road against a total resistance force of 28…
(ii) Find the power of the car's engine.
(b) The car now moves at a constant speed on a straight level road. Given that its engine is working at 54kW, find this speed.
It is given instead that the plane is rough and the particle reaches B with a speed of 8 ms¯¹. The plane is 25 m long and the…
Given that the power and resistance to motion are unchanged, find the steady speed which the cyclist could maintain when riding…
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