|Which quantity X is calculated using this equation? X = change in velocity / time taken
||acceleration, average velocity, distance travelled, speed
|Which relationship defines gravitational field strength?
||mass x 10, mass x weight, mass / weight, weight / mass
|Which is a statement of Newton’s third law of motion?
||Every force causes a reaction., If there is no resultant force on a body then there is no accelerat
|When a nucleus of Uranium-235 absorbs a neutron, nuclear fission occurs. In a typical reaction the total mass decreases by 3 x 10–28 kg.Given that the speed of light c is 3 x 108 m / s, approximately how much energy is released?
||9 x 10–20 J, 2 x 10–13 J, 3 x 10–11 J, 3 x 10–5 J
|Which represents the main energy changes that take place in a coal-fired power station?
||chemical ? heat ? kinetic ? electrical, chemical ? heat ? light ? electrical, chemical ? kinetic ?
|A substance consists of particles that are close together and moving past each other at random. The average speed of the particles is gradually increasing What best describes the substance?
||a liquid being boiled to form a gas, a liquid being heated, a solid being heated, a solid being m
|End X of a metal rod attracts the N-pole of a compass needle. What does this show about the rod?
||It could be made of copper but is not permanently magnetised. , It could be made of copper with a S
|A step-down transformer changes 240 V a.c. to 12 V a.c. There are 600 turns on the primary coil. How many turns are on the secondary coil?
||20, 30, 600, 12000
|Why are high voltages and low currents used to transmit electrical energy over long distances?
||to increase the electromagnetic radiation, to increase the speed at which electrons move, to reduce