Which of the following statements best describes the relationship between the energy EA required to increase a 1000-kg car’s speed from 0 to 23 m/s (about 50 mi/h) and the energy EB required to increase the temperature of 1 gal (? 3.8 kg) of lemonade from refrigerator temperature (about 5°C) to room temperature?
A. EA >> EB
B. EA ? EB
C. EA << EB
B. EA ? EB
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In Part A, you found that Planet Z should not have seasons. What single change to Planet Z's characteristics would cause it to have seasons?
a. a larger axis tilt b. a smaller size= c. a faster rotation rate d. a greater distance from its star
The period of the Moon's rotation on its axis is
A. much shorter than its revolution around the Earth. B. much longer than its revolution around the Earth. C. the same as its revolution around the Earth. D. longer or shorter depending on what part of the year we are in.
In the process of fluorescence, part of the input energy immediately
A) becomes internal energy with the rest as lower-frequency light. B) cascades to excite other atoms in the material. C) is emitted as higher-frequency light and the rest as lower-frequency light. D) excites electrons to metastable states. E) none of the above
Three objects are located in the x-y plane as follows: a 6 kg-object is at (0 m, 0 m), a mass of 4 kg is at (3 m, 0 m), and a 2 kg-object is at (0 m, 3 m). Where is the center of mass of the system?
A) (1 m, 2 m) B) (2 m, 1 m) C) (1 m, 1 m) D) (1 m, 0.5 m) E) (0.5 m, 1 m)