On the H-R diagram, lines of constant radius slants down from left to right
a. True
b. False
Indicate whether the statement is true or false
True
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If H equals 70 km/sec/Mpc, then a galaxy with a radial velocity of 2100 km/sec has a distance of approximately
a. 2170 Mpc b. 2030 Mpc c. 30 Mpc d. 0.03 Mpc e. 147,000 Mpc
If a man says to you that he is absolutely certain of some idea, you can conclude that
A) if his idea really is absolutely true then it must be based on scientific reasoning. B) he is wrong. C) he is right. D) he is a fanatic. E) he is not being scientific.
Cart A with momentum p (in magnitude) collides with cart B at rest and rebounds. What can you say about the momentum of cart B after the collision?
A 35 mm camera equipped with a 45 mm focal length lens is used to photograph a tree 15 m tall. The aperture of the lens is set at f/2. The aperture diameter at f/2, in mm, is closest to:
A) 23 B) 14 C) 18 D) 27 E) 32