Ice is put in a cooler to cool the contents. To speed up the cooling process, the ice can be
A) wrapped in newspaper.
B) drained of water periodically.
C) kept away from the food.
D) broken into smaller pieces.
E) none of the above
Answer: D
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The resistance of the heater is __________
Fill in the blank(s) with correct word
A buzzer with frequency f0 is thrown straight upwards. On the buzzer's trip down, what is the frequency behavior heard by an observer below?
a. The frequency heard is still f0. b. The frequency is a constant one greater than f0. c. The frequency is an increasing one greater than f0. d. The frequency is a decreasing one less than f0.
Convection can occur
A) only in gases. B) only in solids. C) only in liquids. D) only in liquids and gases. E) in solids, liquids, and gases.
What are the two fundamental laws that lie at the heart of quantum mechanics?
A) (1) the uncertainty principle and (2) the exclusion principle B) (1) the absoluteness of the speed of light and (2) the equivalence principle C) (1) the law of conservation of energy and (2) the electromagnetic force law D) (1) the law of conservation of angular momentum and (2) the law of conservation of energy