The smallest units of geologic time are the
a. eons.
b. periods.
c. eras.
d. epochs.
d
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A pulley system can
A) change the direction of a force. B) multiply a force. C) both of these D) none of the above
A string with a fixed frequency vibrator at one end is subjected to varying tensions. When the tension is 20 N, a resonance with 3 antinodes results. What tension would cause a resonance with 2 antinodes in this string?
a. 30 N b. 45 N c. 80 N d. 8.9 N e. 13 N
The astrometric method seeks to detect planets by
A) precisely measuring distances to stars. B) directly detecting the light of planets orbiting stars. C) measuring small changes in the positions of stars on the sky. D) precisely measuring the velocities of stars moving toward and away from us. E) measuring small changes in the apparent brightness of stars.
A vessel containing 5.0 kg of water at 10°C is put into a refrigerator. The 1/7 HP motor (1 HP = 746 W) runs for 5.0 minutes to cool the liquid to the refrigerator's low temperature, 0°C. What is the COP of the refrigerator?
A. 5.7 B. 4.6 C. 6.5 D. 7.2 E. 3.6