Somewhere between the Earth and the Moon is a point where the gravitational attraction of the Earth is canceled by the gravitational pull of the Moon. The mass of the Moon is 1/81 that of the Earth. How far from the center of the Earth is this point?
a. 8/9 the way to the Moon
c. 3/4 the way to the Moon
b. 9/10 the way to the Moon
d. 80/81 the way to the Moon
B
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How do astronomers think Jupiter generates internal heat?
a. fusion b. chemical reactions c. friction due to its fast rotation d. shrinking and releasing gravitational potential energy e. tidal heating
If a = 2.0 cm, b = 5.0 cm, and I = 20 A, what is the magnitude of the magnetic field at the point P?
A. 4.5 ?T B. 7.5 ?T C. 9.0 ?T D. 6.0 ?T E. 3.6 ?T
Two stars have the same spectral type. Star X is in luminosity class III, while Star Y is in luminosity class V. Therefore, Star X is larger in radius than Star Y
Indicate whether the statement is true or false
The fraction of incident sunlight reflected by a celestial body is called its ______________
Fill in the blank(s) with correct word