The internal energy of a substance can be increased by
a. doing work on it
b. letting it do work
c. adding heat to it
d. extracting heat from it
e. none of the above
A, C
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What heats the water in a naturally heated hot spring?
A) nuclear fission within the Earth B) nuclear fusion within the Earth C) the high pressures existing within the Earth D) gamma radiation from the sun E) radioactivity in the Earth
Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions
A) 3.78 W/m2 B) 4.36 W/m2 C) 47.6 W/m2 D) 54.7 W/m2
When an object is spinning in place, it is experiencing:
a. projectile motion. b. circular motion. c. rotational motion. d. vertical motion. e. orbiting motion.
You and your friend, who weighs the same as you, want to go to the top of the Eiffel Tower. Your friend takes the elevator straight up. You decide to walk up the spiral stairway, taking longer to do so
Compare the gravitational potential energy of you and your friend, after you both reach the top. A) It is impossible to tell, since the times you both took are unknown. B) It is impossible to tell, since the distances you both traveled are unknown. C) Your friend's gravitational potential energy is greater than yours, because he got to the top faster. D) Both of you have the same amount of gravitational potential energy at the top. E) Your gravitational potential energy is greater than that of your friend, because you traveled a greater distance in getting to the top.