PART2

(a) State the effect of increasing temperature on the viscosity of a: (i) liquid, (ii) gas

(b) State two factors that determine the magnitude of a moment of a force

(c) A uniform stick AB of length, L, and mass, m, is balanced horizontally on a knife edge 10.0cm from A when an object of 400 g is suspended at A. When the knife edge is moved 5 cm further, the object has to be moved to a point 9.00 cm from A for the stick to balance.

(i) Represent the balance system with a suitable diagram

(ii) Determine the: I. mass, m of the stick; II. length, L.

(d) Explain in terms of air molecules why pressure at the top of a high mountain is less than at sea level.

(e) Mercury of density 13.6 x 10\(^3\)kgm\(^{-3}\) is poured in a container of uniform cross-sectional area 40cm \(^2\) to a height of 20 cm. The total pressure exerted on the base of the container is 1.42 x 10\(^5\)P. Calculate the: (i)  mass of the mercury in the container and (ii) pressure exerted at the surface of the mercury. [g = 10ms\(^{-2}\)