A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into a room per cycle. How much work is required in each cycle?
A) 4 kJ
B) 20 kJ
C) 22 kJ
D) 24 kJ
E) 44 kJ
Answer: A
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Why does the number of sunspots change over time?
A. The Sun's magnetic field changes in strength and shape with time. B. The brightness of the Sun increases and decreases with time. C. The temperature of the Sun increases and decreases over time. D. The solar wind changes speed with time, obscuring them. E. The number of sunspots does not change-the spots are simply on the other side.
What is the resistance of a 0.100-kW light bulb designed to be used in a 120-V circuit dc?
A) 12.0 ? B) 144 ? C) 0.83 ? D) 1.2 ?
Potential: After a proton with an initial speed of 1.50 × 105 m/s has increased its speed by accelerating through a potential difference of 0.100 kV, what is its final speed? (e = 1.60 × 10-19 C , mproton = 1.67 × 10-27 kg)
A. 4.56 × 105 m/s B. 2.04 × 105 m/s C. 3.55 × 105 m/s D. 8.80 × 105 m/s E. 1.55 × 106 m/s
Studying the chromosphere and corona: Consider observations of the solar chromosphere and corona
What are the principle difficulties in observing them in X-ray, ultraviolet, and in visible light? What could be done to circumvent those difficulties?