(i) Define moment of force.

(ii) Write the relationship between the S.I. and C.G.S. unit of moment of force.

A satellite revolves around a planet in a circular orbit. What is the work done by the satellite at any instant? Give a reason.

(i) Identify the class of the lever shown in the diagram below:

(ii) How is it possible to increase the M.A. of the above lever without increasing it's length?

Give one example of each when:

(i) Chemical energy changes into electrical energy.

(ii) Electrical energy changes into sound energy.