A total lunar eclipse is
a. visible only from the path of totality.
b. visible only during a new Moon.
c. visible to all observers on the side of Earth from which the Moon would be visible at that time.
d. an opportunity to study the corona of the Sun.
e. None of the other choices are correct.
c
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A mountain climber lies flat on the surface of a glacier that is inclined at 30 degrees below the horizontal. He remains stationary because he is holding onto a rope attached to a spike embedded in the ice further up slope than he is. The rope is parallel to the surface of the ice. If the force of the ice upon his body is 210N, what is the tension in the rope?
A. 121N B. 105N C. 182N D. 364N E. 242N
Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency of the re-emitted light is
A) considerably less. B) slightly less. C) the same. D) slightly more. E) considerably more.
A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes b. 80 minutes c. 90 minutes d. 70 minutes e. 60 minutes
Suppose we represent Earth with a basketball. On this scale, most of the air in Earth's atmosphere would fit in a layer that is ________
A) about an inch thick B) about 6 inches thick C) about the thickness of a sheet of paper D) about a half-inch thick