Problems
Q1. A mass of 10 gm moving with a speed of 300 m/sec is suddenly brought to rest. If the whole of its kinetic energy is converted into internal energy, find (a) the number of calories added, and (b) the rise in temperature of the body assuming that 70 per cent of the energy is retained by it (sp. ht. =0.03).
Ans. (a) 107.1 cal (b) 249.9°C
Q2. From what height must a hailstone at 0°C and at rest fall in order that 2 per cent of it may melt? Assume that 60 per cent of the energy converted is retained by it and that the temperature everywhere is 0°C.
Ans. 1.142 km
Q3. The Victoria Falls are 343 feet in height. Calculate the difference in temperature of the waters at the foot and at the top, assuming J = 778 ft-lb per B. Th. U. and that ...
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