Astronomy and astrology were often practiced together in ancient cultures, and astrology played an important role in the historical development of astronomy
Indicate whether the statement is true or false
TRUE
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An adiabatic free expansion of a gas in a thermally isolated container is not reversible because
a. work must be done on the gas to return it to its original volume. b. heat must be exchanged with the surroundings to return the gas to its original temperature. c. its internal energy has a greater value after the expanded gas is returned to its original volume and temperature. d. of all of the above. e. of (a) and (b) above only.
Atmospheric pressure at an altitude of 10,000 m is exactly half of what it is at 5,000 m
Indicate whether the statement is true or false
Standing Sound Waves: A string that is 0.26 m long is vibrating in its n = 6 harmonic. The sound from this string excites a pipe that is 0.88 m long and open at both ends into its second overtone resonance. What is the common resonant frequency of the string and the pipe? The speed of sound in air is 345 m/s.
A. 590 Hz B. 390 Hz C. 490 Hz D. 690 Hz E. 760 Hz
At what rate is thermal energy generated in the 20-? resistor when ? = 20 V?
a.
6.5 W
b.
1.6 W
c.
15 W
d.
26 W
e.
5.7 W