A solid cuboid has dimensions 0.20 m × 0.10 m × 0.10 m and density 2000 kg m–3. What pressure is exerted by the weight of the cuboid when it…

A ‘gold medal’ used in events such as the Olympic Games is made from a silver–nickel alloy with a coating of a gold–silver alloy.The mass of the medal is 256…

A large metal sphere mounted on an insulating stand is negatively charged. A smaller, uncharged metal sphere mounted on an insulating stand is placed near to the negatively charged sphere.…

Quantities associated with a moving vehicle include its velocity, speed, momentum and kinetic energy. Which of these quantities will always change if the vehicle changes direction? Answer: 11) E Speed…

An AC voltage is induced in a coil of wire when it is rotated in a magnetic field. This voltage can be displayed on the screen of an instrument called…

Below are three statements about radioactivity or nuclear energy.1 Neutrons emitted in nuclear fission can cause further fission.2 The half-life of a radioactive substance is half the time taken for…