A(n) _______________ can occur only at a full Moon if the Moon's path carries it through the shadow of Earth
Fill in the blank(s) with correct word
lunar eclipse
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The time interval during which a nucleus has a 50% probability of decaying is its _________
Fill in the blank(s) with correct word
A knight on horseback holds a 10-m lance. The horse can run at 0.78c. (It wins most of its races!) How long will the lance appear to a person that is standing still on the ground as the horse runs past?
a. 7.1 m c. 10 m b. 15 m d. 6.3 m
Explain why the principle of homogeneity is an important aspect of the cosmological principle
What will be an ideal response?
A simple pendulum consists of a mass M attached to a weightless string of length L. For this system, when undergoing small oscillations
A) the frequency is proportional to the amplitude. B) the frequency is inversely proportional to the amplitude. C) the period is proportional to the amplitude. D) the frequency is independent of the mass M. E) the frequency is independent of the length L.