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.
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Indicate whether the statement is true or false
For a plane wave approaching an obstacle with a rectangular opening, diffraction becomes important in which of the following circumstances?
A. the beam is coherent B. one or more dimensions of the rectangular opening is near the wavelength of the source C. both dimensions of the rectangular opening are larger than the wavelength of the source D. only if the opening is circular
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
a. 323 N b. 161 N c. 118 N d. 12.7 N e. 252 N
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)
a. 580 nm c. 492 nm b. 400 nm d. 626 nm