Lunar eclipses last longer than solar eclipses because
a) the Moon is much farther from Earth during a lunar eclipse.
b) the diameter of Earth is much greater than the diameter of the Moon.
c) Earth's period of rotation is always greater during a lunar eclipse than during a solar eclipse.
d) the lunar shadow is only a penumbra with no dark umbra region to extend the length of the eclipse.
b
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A lunar vehicle is tested on Earth at a speed of 12 km/h. When it travels at the same speed on the Moon, is its momentum greater, less, or the same?
Displacement: If, in the figure, you start from the Bakery, travel to the Cafe, and then to the Art Gallery(a) what distance you have traveled?(b) what is your displacement?
What will be an ideal response?
What is a helium flash?
A) It is the sudden onset of helium fusion in the core of a low-mass star. B) It is the ignition of helium shell fusion in a high-mass star with a carbon core. C) It is a sudden brightening of a low-mass star, detectable from Earth by observing spectral lines of helium. D) It is another name for the helium fusion reaction.
Which of the following forces is the strongest at near distances?
a. gravitational b. weak nuclear c. strong nuclear d. electromagnetic