Balboa Park in San Diego has an outdoor organ. When the air temperature increases, the fundamental frequency of one of the organ pipes (the thermal expansion of the pipe is negligible) runs
1.increases.
2.decreases.
3.stays the same.
4.is impossible to determine.
1
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Suppose we could magically triple the distance between Earth and the moon. This would cause the gravitational force by Earth on the moon to be
A) increased to three times its former value. B) be unchanged. C) reduced to 1/4 of its former value. D) reduced to 1/3 of its former value. E) reduced to 1/9 of its former value.
An amount of a monatomic ideal gas is taken around the process shown. The amount of heat extracted during process B-C is:
1.10 J
2.20 J
3.15 J
4.45 J
5.60 J
6.none of the above
7.cannot be determined
Whether the Universe is open, closed or flat depends, on the ___________ of the Universe
a. luminosity b. density c. temperature d. radius e. rotation rate
An altocumulus cloud belongs to which cloud family?
a. Low b. Clouds of vertical development c. High d. Middle