What is the escape velocity of a satellite launched from the earth’s surface? (Take g as 10ms\(^{-2}\) and the radius of the earth as 6.4 × 10\(^6\)m)
A brass cube of side 10cm is heated through 30°C. If the linear expansivity of brass is 2.0 × I0\(^{-5}\) K-1 , what is the increase in its volume?
