At what point is the Moon closest to Earth?
a. apogee
b. perigee
c. umbra
d. penumbra
e. prominence
b
You might also like to view...
The gravitational force that the Earth exerts on the Moon is equal and opposite to that which the Moon exerts on the Earth. Therefore, according to Newton's second law of motion,
A) the Moon and the Earth both have equal accelerations, because the forces are equal. B) the Moon has a larger acceleration than the Earth, because it has a smaller mass. C) the Earth has a larger acceleration than the Moon, because it has a larger mass.
Why do astronomers believe that the Jovian planets are composed mainly of hydrogen and helium?
A. Because the Jovian planets have low densities. B. Because hydrogen and helium are the main constituents of the Solar System. C. Because the Jovian planets are very large. D. The Voyager missions measured the chemical compositions of the interiors of the Jovian planets.
A heat engine has an efficiency of 35.0% and receives 150 J of heat per cycle. (a) How much work does it perform in each cycle? (b) How much heat does it exhaust in each cycle?
What will be an ideal response?
Transparency of the atmosphere is lowest for radiation of
A) ultraviolet light. B) visible light. C) infrared light.