Orion is visible on winter evenings in the northern hemisphere but not summer evenings because of
A) interference from the full Moon.
B) the tilt of Earth's axis.
C) the location of Earth in its orbit.
D) the precession of Earth's axis.
E) baseball on television.
C
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A refrigerator uses 100 W of electric power and discards 600 W of thermal power into the kitchen. What is its coefficient of performance?
A. 0.17 B. 0.20 C. 5 D. 6 E. Other (specify) F. Impossible because it violates conservation of energy.
The resistive force of friction occurs for
A) solids. B) liquids. C) gases. D) all of the above
The__________is the period of time after the glow of the big bang faded into the infrared and before the birth of the first stars, during which the Universe expanded in darkness
A) space age B) dark age C) atomic age D) ice age
What total energy is stored in the group of capacitors shown if the potential difference Vab is equal to 50 V?
a.
48 mJ
b.
27 mJ
c.
37 mJ
d.
19 mJ
e.
10 mJ