Thermodynamic Devices: An ideal Carnot refrigerator powered from an electrical outlet takes heat from water at 0.0°C and rejects heat to a room at 20.0°C. How much electrical energy must be supplied to the refrigerator so it will convert 78 g of water at 0.0°C to ice at 0.0°C. The latent heat of fusion of water is 3.34 × 105 J/kg.

Fill in the blank(s) with the appropriate word(s).


1900 J

Physics & Space Science

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The distance between Earth and the Sun is 93,000, 000 miles, or one ______________

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Which planet has the hottest surface temperature?

A. Venus B. Mercury C. Mars D. Earth

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In beta minus decay, the number of neutrons in the nucleus

A) is decreased by 1. B) is decreased by 2. C) is increased by 1. D) is increased by 2. E) remains unchanged.

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What in a DC motor reverses the polarity and current each half-cycle?

A) a CRT B) solid ring commutator C) a split ring commutator D) fuse

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