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.
E
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A heavy seesaw is out of balance. A lightweight girl sits on the end that is tilted downward, and a heavy boy sits on the other side so that the seesaw now balances
If the boy and girl both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw? A) The side the girl is sitting on will once again tilt downward. B) The side the boy is sitting on will now tilt downward. C) Nothing, the seesaw will still be balanced. D) It is impossible to say without knowing the masses of the children. E) It is impossible to say without knowing the values of the original distances.
A golf club hits a golf ball with a force of 2400 N, sending the ball into the air. The force exerted on the club by the ball must be less than 2400 N or else the ball would not have moved forward
A) True B) False C) The answer depends on whether the golfer followed through with the swing.
What observational evidence supports the hypothesis that elliptical galaxies are born from relatively dense protogalactic clouds?
A) Elliptical galaxies have stars packed more densely together than spiral galaxies. B) Elliptical galaxies are generally larger than spiral galaxies. C) Even very distant elliptical galaxies tend to lack young, blue stars, indicating their stars formed early and rapidly. D) Elliptical galaxies have more and denser gas than spiral galaxies. E) The stars in elliptical galaxies are denser than those in spiral galaxies.
A spring with spring constant k = 800 N/m is compressed 12 cm from its equilibrium position. A spring with spring constant k = 400 N/m has the same elastic potential energy as the first spring when its extension is
a. 0.060 m. b. 0.085 m. c. 0.12 m. d. 0.17 m. e. 0.24 m.