1 Q16. Temperature And Heat

2 When a certain constant volume gas thermometer is in thermal contact with water at its triple point ( K) the pressure is 6.30  104 Pa. For this thermometer a kelvin corresponds to a change in pressure of about: 4.34  102 Pa 2.31  102 Pa 1.72  103 Pa 2.31  103 Pa 1.72  107 Pa 25

3   for

4 A cube of aluminum has an edge length of 20 cmA cube of aluminum has an edge length of 20 cm. Aluminum has a density 2.7 times that of water and a specific heat times that of water. When the internal energy of the cube increases by cal, its temperature increases by: 5 C˚ 10 C˚ 20 C˚ 100 C˚ 200 C˚ 25

5

6 Take the mechanical equivalent of heat as 4 J/calTake the mechanical equivalent of heat as 4 J/cal. A 10-gram bullet moving at 2000 m/s plunges into 1 kg of paraffin wax (specific heat 0.7 cal / g °C). The wax was initially at 20°C. Assuming that all the bullet's energy heats the wax, its final temperature (°C) is : 20.14 23.5 20.006 27.1 30.23 45

7

8 The rate of heat flow through a slab is PcondThe rate of heat flow through a slab is Pcond. If the slab thickness is doubled, its cross-sectional area is halved, and the temperature difference across it is doubled, then the rate of heat flow becomes: 2Pcond Pcond /2 Pcond Pcond /8 8Pcond 25

9