Why is Newton's version of Kepler's third law so useful to astronomers?

A) It can be used to determine the masses of many distant objects.
B) It allows us to calculate distances to distant objects.
C) It tells us that more-distant planets orbit the Sun more slowly.
D) It explains why objects spin faster when they shrink in size.


A) It can be used to determine the masses of many distant objects.

Physics & Space Science

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A shot-putter moves his arm and the 6.00-kg shot through a distance of 1.25 m, giving the shot a velocity of 8.20 m/s from rest. Find the average force exerted on the shot during this time

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A silicon monoxide (n = 1.45) film of 108 nm thickness is used to coat a glass camera lens (n = 1.56). What wavelength of light in the visible region (390 to 710 nm) will be most efficiently transmitted by this system? (1 nm = 10-9 m)

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For a plane wave approaching an obstacle with a rectangular opening, diffraction becomes important in which of the following circumstances?

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Physics & Space Science