(1) A uniform metre rule balances horizontally on a knife edge placed at the 58cm mark when a weight of 20gf is suspended from one end.
(a) Draw a diagram of the arrangement.
(b) What is the weight of the rule?
(2) A uniform metre scale can be balanced at the 70cm mark when a mass 0.05kg is hung from the 94cm mark. Find the mass of the metre scale.
(3) A truck weighing 1000 kgf changes its speed from 36 km/hr to 72km/hr in 2 minutes. Calculate (a) the work done by the engine and (b) its power. (g= 10metre per second square.