If the Moon is relatively far from Earth, so that the umbra does not reach Earth, someone directly behind the umbra will see
A) a penumbral lunar eclipse.
B) a partial lunar eclipse.
C) a partial solar eclipse.
D) an annular eclipse.
E) no eclipse.
D
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None of the other stars yet studied has more than one planet orbiting it
Indicate whether the statement is true or false
No planets have ever been found around any pulsars
Indicate whether the statement is true or false
True or False: People traveling near the speed of light relative to Earth would measure their lifespans and find them, on the average, longer than the average human lifespan as measured on Earth
1.False 2.True
A heat pump uses 100 J of work output heat at some temperature. If the heat pump withdraws 60 J of heat from some lower temperature, then what is the coefficient of performance for the heat pump?
A. 1.6 B. 2.0 C. 2.4 D. 2.8