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Multiple Choice Question with Only One Choice Correct
A truck is moving on a smooth horizontal surface with a uniform speed of u is carrying stone-dust. If a mass

m of the stone-dust 'leaks' from the truck in a time

t, the force needed to keep the truck moving at its uniform speed is

(a)	u m/t	(b)	m du/dt
(c)		(d)	zero

Chemistry

Calculate the equilibrium constant for the reaction Fe²⁺ + Ce⁴⁺

Fe³⁺ + Ce³⁺. (given : E^o_{Ce⁴⁺ICe³⁺} = 1.44 V and E^o_{Fe³⁺IFe²⁺} = 0.68 V.)

Mathematics

A variable straight line of slope 4 intersects the hyperbola xy = 1 at two points. Find the locus of the point which divides the line segment between these two points in the ratio 1 : 2.

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