An eclipse of the Moon (lunar eclipse) as seen from Earth, happens when
a. the hot luminous Moon suddenly cools and stops emitting light.
b. the Moon passes between Earth and the Sun.
c. the Earth is between the Moon and the Sun.
d. the Moon is 90 degrees from the direction of the Sun.
c
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Polaris has always been the star nearest the north celestial pole
a. True b. False Indicate whether the statement is true or false
A known weight W is supported at B by two separate cables, AB and BC. Later cable BD with known tensile force TBD 5 W/2 is added to prevent oscillations. The force in cable AB, TAB, is (in terms of weight W):
(A) 20.98W
(B) 0.96W
(C) 20.84W
(D) 20.76W
The amount of 
Ar is one-ninth the amount of 
K. If the half-life of the latter is T, what is the rock’s age?
A. T B. T/9 C. 9T D. ln(9T) E. T/ln 9 F. Some other result (specify)
Motion in a P-wave is
A) side to side. B) transverse. C) longitudinal. D) up and down.