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Statement-1:Comets move around the sun i...

Statement-1:Comets move around the sun in elliptical orbits, the gravitational force on the comet due to sun is not normal to the comet's velocity, but the work done by the gravitational force over every complete orbit of the comet is zero.
Statement-2: Gravitational force is a conservative force and the work done by a conservative force over a closed path is always zero.

A

Statement-1 is true, statement-2 is true, Statement-2 is a correct explanation for statement-1.

B

Statement-1 is true, Statement-2 is true, statement-2 is Not a correct explanation for statement-1

C

Statement-1 is true, Statement-2 is false.

D

Statement-1 is false Statement-2 is True.

Text Solution

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The correct Answer is:
a
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Answer the following: a) The casing of a rocket in flight burns up due to friction. At whose expense is the heat required for burning obtained? The rocket or the atmosphere? b) Comets move around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet's velocity in general. Yet the work done by the gravitatonal force over every complete orbit of the comet is zero. Why? c) An artificial satellite orbiting the earth in very atmosphere loses its energy grdually due to dissipation against atmospheric resistance, howerver small. Why then does its speed increase progressively as it comes closer and closer tothe earth? d)In fig i) the man walks 2m carrying a mass of 15 kg on his hands. In Fig ii) he walks the same distance pulling the rope behind him. The rope goes over pulley, and a mass of 15 kg hangs at its other end. In which case is the work done greater?

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