Which of the following planets cannot be seen with the naked eye?
A) Venus
B) Mars
C) Jupiter
D) Saturn
E) Neptune
E) Neptune
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A primitive space heater consists of a 10.0 cm radius iron ball through which electrical current was passed in order to heat the ball and subsequently the surrounding air. If the temperature of the iron ball was kept at 530 K and the room temperature was 
what power would be radiated into the room? Assume the ball is a perfect blackbody.
A. 140 W B. 110 W C. 430 W D. 480 W
Earth doesn't experience a solar eclipse every month because
a. of unpredictable weather patterns. b. the moon always keeps its same side toward the Earth. c. the moon's position is not aligned with the Earth's orbit. d. its sometimes nighttime when the eclipse occurs. e. sometimes the moon is too far away.
The surface of hot water has a relatively high rate of
A) evaporation. B) condensation. C) conductivity. D) convection.
A relatively new medical device that uses ultrasonics is referred to by the acronym CUSA. What does the letter A stand for?
a. aspirator b. accumulator c. array d. audible