Q16. Temperature And Heat.

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Presentation transcript:

Q16. Temperature And Heat

When a certain constant volume gas thermometer is in thermal contact with water at its triple point (273.16 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 <PowerClick><Answer>2</Answer><Option>5</Option></PowerClick>

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A cube of aluminum has an edge length of 20 cm A cube of aluminum has an edge length of 20 cm. Aluminum has a density 2.7 times that of water and a specific heat 0.217 times that of water. When the internal energy of the cube increases by 47000 cal, its temperature increases by: 5 C˚ 10 C˚ 20 C˚ 100 C˚ 200 C˚ <PowerClick><Answer>2</Answer><Option>5</Option></PowerClick>

Take the mechanical equivalent of heat as 4 J/cal Take 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 <PowerClick><Answer>4</Answer><Option>5</Option></PowerClick>

The rate of heat flow through a slab is Pcond The 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 <PowerClick><Answer>2</Answer><Option>5</Option></PowerClick>