AS Level Physics U6 Introductory Quiz

What is the approximate kinetic energy of an Olympic athlete when running at maximum speed during a 100 m race?

Two identical, perfectly elastic spheres have the same mass m. They travel towards each other with the same speed v along a horizontal frictionless surface. Which statement about the sum of the kinetic energies of the spheres is correct?

A piston in a gas supply pump has an area of 500 cm2 and it moves a distance of 30 cm during one stroke. The pump moves the gas against a fixed pressure of 4000 Pa. How much work is done by the piston during one stroke?

A railway engine accelerates a train of total mass 1200 tonnes (1 tonne = 1000 kg) from rest to a speed of 75 m s^–1. How much useful work must be done on the train to reach this speed?

The diagram shows a hydroelectric power station. The reservoir is linked to the turbines by a pipe of uniform cross-sectional area. Water flows from the reservoir, through the pipe and through the turbines at a constant rate. Which statement about the change of energy of the water as it moves from X to Y is correct?

A concrete cube of side 0.60 m and uniform density 2.0 × 10^3 kg.m^–3 is lifted 5.0 m vertically by a crane. What is the change in potential energy of the cube?