9 10. Solve any TWO numerical questions: [2x4=8]
a. A ball of copper of specific heat capacity 400 J kg "k
weighing 400 g is transferred from a furnace to 1 kg of water
at 20°C. The temperature of water rises to 50°C. What is the
onginal temperature of the ball?
Ans: 837.5°C

b) returns freshwater to the earth.

c) returns freshwater to the earth.c) occurs after condensation.

d) returns freshwater to the earth.c) occurs after condensation.d) roughly equal to the amount of evaporation.

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at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.