What is the coefficient of performance of an ideal Carnot heat pump used to heat a house whose inside temperature is 24°C when the outdoor temperature is -12°C?
A)
8.25
B)
2.75
C)
0.67
D)
0.53
E)
5.00
A
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The principle of conservation of energy states that if the total mechanical energy is a constant then
A. the momentum is always a constant B. no work is done on a system by any nonconservative forces C. no work is done on a system by any forces D. work is done on a system in order to conserve energy
A rain cloud contains 2.66 × 10^7 kg of water vapor. How long would it take for a 2.0 kW pump to lift the same amount of water to an altitude of 2 000 m?
Which of the following atoms normally has one covalent bond to it?
a. Br b. O c. C d. P e. Ne
Electrons are accelerated through a potential difference V and then strike a dense target. In the x-rays that are produced
A. the maximum wavelength depends on V. B. the wavelength of the characteristic peaks depend on V. C. the minimum wavelength depends on V. D. the wavelength of the Bremsstrahlung depends on V.