A 100 g mass is suspended from a spring next to a vertical metre rule. The top of the spring is level with the 0.0 cm mark. The bottom of the spring is level with the 27.2 cm mark. The 100g mass is replaced with a 600g mass. The length of the spring is now 89.7 cm. The spring has not reached the limit of proportionality. The 600 g mass is replaced with a 200 g mass. What is the length of the spring?

The same downward force is applied to four objects resting on a horizontal surface. Which exerts the greatest pressur…

Four identical measuring cylinders contain liquid. Two contain water of density 1000 kg/m³. Two contain paraffin of d…

A steel ball is released just below the surface of thick oil in a cylinder. During the first few centimetres of trave…

Sound travels at different speeds in air, water and steel. For these materials, which row is correct?

Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material?

To charge an isolated metal sphere by induction, the following four processes are required. P The sphere is earthed b…