A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle. How much work is required in each cycle?
A. 4 J
B. 20 J
C. 24 J
D. 44 J
B. 20 J
You might also like to view...
X-rays from the Sun's corona
A) are absorbed in Earth's troposphere. B) are absorbed in Earth's thermosphere. C) cause meteor showers. D) break apart ozone in the stratosphere. E) generally reach Earth's surface and fry us.
Resonance in a series RLC circuit occurs when
A) XL is greater than XC. B) XC is greater than XL. C) (XL - XC) is equal to R2. D) (XL - XC)2 is equal to R2. E) XC equals XL.
Quantum issues often constrain transitions in quantum harmonic oscillators to those where ?n = 1. Consider a spectrum chart (like the one shown in figure Q11.2) for such a system. What would this chart look like?
A. There would be only one emission line.
B. The emission lines would be evenly spaced in energy.
C. The emission lines would become more closely spaced (in energy) as we go to the right.
D. The emission lines would become farther apart (in energy) as we go to the right.
Variable stars are ones whose ________ changes over time
Fill in the blank(s) with correct word