A 60 kg ice-skater, travelling initially at 3.0 m/s, glides across a horizontal icy surface. The skater brakes and comes to rest after 5.0 m. The work done against the braking force is the change in the kinetic energy of the skater. What is the braking force?

A small emergency generator supplies 432 000 000 J of electrical energy in twenty-four hours. What is the average pow…

Which quantity is measured in kilowatt-hours?

The diagram represents parts of a power station. What is the order of the energy changes taking place?

The diagram shows part of a cathode-ray oscilloscope. Which particles are emitted by the cathode?

Which row gives the range and electrical charge of an alpha-particle?

¹⁴₆C represents a nuclide of the element carbon and ¹⁴₇N a nuclide of nitrogen. How does a neutral atom of ¹⁴₇N diffe…