(ii) Under what conditions will two forces form a couple?
(b)(i) When is a body said to be in a stable equilibrium?
(ii)The diameter of a uniform cylinder is 0.2m and its height is 0.4m. The cylinder is placed on an inclined plane. Calculate the maximum angle to the horizontal to which the plane can be inclined before the cylinder falls down.
(c)(i) State the principle of moment.
(ii)A heavy metal beam AB of mass 25kg is supported at its ends. The beam carries a mass of 150kg at a distance of 0.75m from end A. If the beam is 2m long, determine the thrust at supports A and B.
(iii)What assumption will you make to support your calculations in part (c)(ii) above?
5.(a) Heat and temperature are closely related but they are different. State how they are related and how they differ.
(b)(i) What are the fixed points of a thermometer?
(ii)The temperature of the melting point of ice and that of steam above water boiling at 760mmHg pressure are marked as 20 and 80 respectively on a certain thermometer. Calculate the thermometer reading when the temperature is 60°C.
(ii) Briefly explain when resonance is said to occur?
(b)Two boys at 200m apart stand on one side of a high vertical cliff at the same perpendicular distance from it. When one fires a gun, the other hears the sound 0.6 seconds after the flash and the second sound 0.25 seconds after the first sound. Calculate the perpendicular distance of the two boys from the cliff.
(c)Figure 1 illustrates part of the displacement-time graph of a wave traveling across water at a particular place with a velocity of 2m/s. Calculate: