CAIE
Physics
(9702)
Questions & Answers
Define the radian.
The bicycle is being pedalled so that it moves in a straight line at a constant speed of 17 m s^-1. Calculate the angular speed of the rear wheel.
Calculate the period of rotation of the small cog.
Show that the distance moved by point X on the chain during one full rotation of the small cog is 0.24 m.
Use the information in (b)(iii) to determine the angle through which the large cog rotates during one full rotation of the small cog.
The chain of the bicycle in (b) is moved onto a smaller cog fixed to the rear wheel. The speed of the bicycle does not change. Explain, without calculation, the effect of this change on the angular speed of the pedals.
State what is represented by a gravitational field line.
On Fig. 2.1, draw field lines to represent the Earth’s gravitational field outside the Earth.
On Fig. 2.3, label the magnetic poles with the letters N and S to indicate which one is the magnetic N pole and which one is the magnetic S pole.
On Fig. 2.3, draw field lines to represent the Earth’s magnetic field outside the Earth.
Use your answer in (a)(ii) to explain why the observed gravitational field of the Earth does not vary around the surface.
With reference to your answer in (b)(ii), describe how the observed magnetic field of the Earth varies around the surface.
Define specific heat capacity.
A block of aluminium has a volume of 3.612 × 10^-3 m^3 at 0 °C. Aluminium has a density of 2.700 × 10^3 kg m^-3 at 0 °C. Calculate the mass of the block.
Show that the volume of the block at a temperature of 500 °C is 3.722 × 10^-3 m^3.
Use the information in (b)(ii) to determine the magnitude of the work done on the block when its temperature is raised from 0 °C to 500 °C.
Explain whether the work done on the block is positive or negative.
Use the first law of thermodynamics to determine, to three significant figures, a value for the specific heat capacity of aluminium. Explain your reasoning. Give a unit with your answer.
Without further calculation, suggest with a reason how doubling the pressure in (b) is likely to affect the answer in (b)(v).
State the meaning, in the equation, of the symbol T.
Identify the constant B.
State the meanings, in this equation, of the symbols m and <c^2>.
Use the equations in (a) and (b) to derive an expression, in terms of A, B and T, for the mean kinetic energy EK of a molecule of the gas.
On Fig. 4.1, sketch the variation with T of the root-mean-square (r.m.s.) speed of the molecules of an ideal gas.
State what is meant by simple harmonic motion.
The velocity v of the block varies with time t according to v = 0.56 cos 16t. Calculate the period of the oscillation.
Determine the amplitude x0 of the oscillation.