Which of these gets so bright as to be seen in daylight at times?
A) Venus B) Jupiter C) Mars D) Saturn E) Mercury
A
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Heat flow occurs between two bodies in thermal contact when they differ in what property?
a. mass b. specific heat c. density d. temperature
Estimate the rate of evaporation of acetone into 75ºF air from an open 4-inch-diameter by 8-inch-tall jar when the liquid acetone is 2 inches deep at the bottom of the jar and fresh air passes over the top of the jar.
What will be an ideal response?
A zoom lens for a camera is adjusted to change its focal length from 38 mm to 304 mm. If the same amount of light is to be admitted to the lens in both cases, what is the final f-number if the original f-number was f/2.0?
What will be an ideal response?
The apparent weight of a fish in an elevator is greatest when the elevator
a. moves downward at constant velocity. b. moves upward at constant velocity. c. accelerates downward. d. accelerates upward. e. is not moving.