The three fusion reactions in the Sun that form helium from hydrogen are together called the
a. proton-proton chain.
b. hydrogen cycle.
c. helium sequence.
d. neutrino exchange.
a
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An observer approaches a stationary 1000 Hz sound source at twice the speed of sound. The observer hears a frequency of
A) 2000 Hz. B) 500 Hz. C) 4000 Hz. D) 1500 Hz. E) 3000 Hz.
A cube of material with emissivity of 0.4 is heated from room temperature of 20°C to 100°C. The net power radiated by the cube is 20 W. What is the volume of the cube? (? = 5.6696 × 10^–8 W/m2·K4
a. 0.0014 m3 b. 0.012 m3 c. 0.11 m3 d. 1.8 m3
Two identical clocks are made. One is placed on the surface of a massive planet, and the other is placed in interstellar space. Which runs faster?
A. The space clock B. The planet clock C. Both clocks will run at the same rate
100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? (The heat of evaporation of nitrogen is 6.09 cal/gram and the heat of fusion of water is 80 cal/gram.)