Showing 231 to 240 of 759 Questions
  • A thermodynamic system undergoes a process in which its internal energy decreases by 500 J. At the same time, 220 J of work is done on the system. Find the energy transferred to or from it by heat.

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    191
  • A thermometer of mass 0.0550 kg and of specific heat 0.837 kJ/kg ∙ K reads 15.0oC. It is then completely immersed in 0.300 kg of water, and it comes to the same final temperature as the water. If the thermometer then reads 44.4oC, what was the temperature of the water before insertion of the thermometer?

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    83
  • A tile floor in a bathroom may feel uncomfortably cold to your bare feet, but a carpeted floor in an adjoining room at the same temperature will feel warm. Why?

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    325
  • A vertical heat-insulated cylinder is divided into two parts by a movable piston of mass m. Initially the piston is held at rest. The top part is evacuated and the bottom part is filled with 1 mole of diatomic ideal gas at temperature 300 K. After the piston is released and the system comes to equilibrium, the volume, occupied by gas, is

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    96
  • A volume of air(assumed to be an ideal gas) is first cooled with out changing its volume and then expanded without changing its pressure, as shown by the path abc in Fig. 19.30. (a) How does Ute final temperature of the gas compare with its initial temperature? (b) How much heat does the air exchange with its surroundings during the

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    1254
  • A warning sign often seen on highways just before a bridge is “Caution—Bridge surface freezes before road surface.” Which of the three energy transfer processes discussed in Section 20.7 is most important in causing a bridge surface to freeze before a road surface on very cold days?

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    212
  • A warning sign often seen on highways just before a bridge is “Caution—Bridge surface freezes before road surface.” Which of the three energy transfer processes discussed in Section 20.7 is most important in causing a bridge surface to freeze before a road surface on very cold days?

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    607
  • A water heater can generate 32,000 kJ/h how much water can it heat from 15oC to 50oC per hour?

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    222
  • A water heater is operated by solar power. If the solar collector has an area of 6.00 m2 and the intensity delivered by sunlight is 550 W/m2, how long does it take to increase the temperature of 1.00 m3 of water from 20.0°C to 60.0°C?

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    167
  • A waterfall is 75 m high. If of the gravitational potential energy of the water went into heating the water, by how much would the temperature of the water, increase in going from the top of the falls to the bottom?

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    0