Which planet has the highest average surface temperature and why?
A) Mercury, because it is closest to the Sun
B) Mercury, because of its dense carbon dioxide atmosphere
C) Venus, because of its dense carbon dioxide atmosphere
D) Mars, because of its red color
E) Jupiter, because it is so big
C) Venus, because of its dense carbon dioxide atmosphere
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A sticky hockey puck slides along a frictionless, horizontal ice surface at 75 m/s in the +x direction. It collides with a second sticky puck originally sliding at 25 m/s in the -y direction. They collide totally inelastically. If the first puck has a mass equal to half that of the second, what is the angle of their final velocity vector below the +x direction?
A. 9.5 degrees B. 42 degrees C. 34 degrees D. 49 degrees E. 37 degrees
The period from about 100 seconds up to 15 minutes after the Big Bang is the:
A) Radiation Era. B) Lepton Epoch. C) Nuclear Epoch. D) Decoupling Epoch. E) Matter Era.
A hole is punched in a full milk carton, 10 cm below the top. What is the initial velocity of outflow?
A. 1.4 m/s B. 2.0 m/s C. 2.8 m/s D. 3.9 m/s E. 4.2 m/s
Ming measures a recession velocity of 2000 km/sec for a galaxy. About how far away is that galaxy if the Hubble constant is 20 km/sec/million light years? (Hint: be sure to check the units in your calculation.)
A) 100 million light years B) 100 light years C) 40 thousand light years D) 40 billion light years