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##### EXAMPLE 3.8 A stone of mass 100 \mathrm{~g} is attached to a string 1 \mathrm{~m} long. The stone is rotating in a circle with a speed of 5 \mathrm{~ms}^{-1} . Find the tension in the string.

A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?

Show that ratio of the root mean square speeds of molecules of two different gases at a certain temperature is equal to the square root of the inverse ratio of their masses.

3.5 A body has weight 20 \mathrm{~N} . How much force is required to move it vertically upward with an acceleration of 2 \mathrm{~ms}^{-2} ? (24 N)

ii. Inertia depends upon(a) force(b) net force(c) mass(d) velocity

A heat engine performs 100 \mathrm{~J} of work and at the same time rejects 400 \mathrm{~J} of heat energy to the cold reservoirs. What is the efficiency of the engine?

3.2 The weight of a body is 147 \mathrm{~N} . What is its mass? (Take the value of g as 10 \mathrm{~ms}^{-2} )(14.7kg)