Tuning forks #1, #2, and #3 each have slightly different frequencies.When #1 and #2 are sounded together, a beat frequency of 3 Hz results. When #2 and #3 are sounded together, a beat frequency of 5 Hz results. If the frequency of #1 is 100 Hz, which of the following cannot be the frequency of #3?
a. 92 Hz
b. 95 Hz
c. 98 Hz
d. 102 Hz
e. 108 Hz
B
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According to the universal law of gravitation, if the masses of both attracting objects double, then the gravitational force between them will
A) not change at all. B) increase by a factor of 2. C) decrease by a factor of 2. D) increase by a factor of 4. E) decrease by a factor of 4.
On the H-R diagram, the Sun lies
A) about the middle of the main sequence. B) at the top left. C) at the bottom right. D) at the bottom left. E) at the top right.
Regarding the validity of Ptolemy's and Copernicus' theories:
A) Ptolemy was proven wrong and Copernicus was proven right. B) they were both good theories, but Ptolemy's point of view ultimately turned out to be more useful. C) the experimental facts known in Copernicus' time tended to support Copernicus' theory over Ptolemy's. D) they were both wrong and useless theories. E) they were both good theories, but Copernicus' point of view ultimately turned out to be more useful.
Define power in terms of both work and energy
What will be an ideal response?