A bullet fired horizontally from a rifle begins to fall
A) as soon as it leaves the barrel.
B) after air friction reduces its speed.
C) neither of these
Answer: A
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The rotation curve of a galaxy can be used to determine
a. the relative number of hot young stars in the galaxy. b. the relative amount of gas and dust in the galaxy. c. the radius of the galaxy. d. the luminosity of the galaxy. e. the mass of the galaxy.
Quasar spectra often show the same hydrogen absorption line with several different redshifts. What do these lines represent?
A) clouds of gas at different distances between us and the quasar B) different elements in the accretion disk around the quasar C) different elements in the Earth's atmosphere D) a single cloud of gas with clumps moving at different speeds E) hydrogen gas orbiting the quasar's central black hole at high speed
A person's eye lens is 2.7 cm away from the retina. This lens has a near point of 25 cm and a far point at infinity
(a) What must the focal length of this lens be in order for an object placed at the near point of the eye to focus on the retina? (b) What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?
At what point does the accretion process turn a clump of debris into a planetesimal?
What will be an ideal response?