If an object is placed before a singe thin lens
A. real images are always enlarged.
B. virtual images are always inverted.
C. real images are always inverted.
D. convex lenses never create virtual images.
C. real images are always inverted.
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What is main-sequence fitting?
A) a way of forcing stars to fit into a standard main sequence, even when they have some unusual characteristics B) a method for determining the age of a star cluster C) a method for determining the distance to a star cluster by assuming that its main sequence should line up with the main sequence on a standard H-R diagram D) the way we construct an H-R diagram by plotting the surface temperatures and luminosities of stars
A(n) ____________________ periodically emits large amounts of X-ray radiation as material accretes around a neutron star or black hole
Fill in the blank(s) with correct word
A high pressure system in the Northern Hemisphere will have
a. rising air which draws surface air in, the surface winds spiral to the left. b. rising air which draws surface air in, the surface winds spiral to the right. c. sinking air which pushes surface air out, the surface winds spiral to the left. d. sinking air which pushes surface air out, the surface winds spiral to the right.
A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units):
angle of landing height = launch height. What is the initial velocity of launch of the boulders if air resistance is negligible? A) 44 m/s B) 1.4 m/s C) 22 m/s D) 0.69 m/s