Unlike Earth, Mars' seasons are affected (enhanced and diminished) by the distance between Mars and the Sun. This is because:
A) Earth is closer to the Sun to begin with.
B) an Earth year is shorter.
C) Mars is tilted more on its axis than Earth is.
D) the orbit of Mars is significantly more elliptical.
E) Mars gets closer to the Sun than the Earth does.
D
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Baryons are composed of _______ quarks, and mesons are composed of ________ quarks
a. two, two c. three, three b. two, three d. three, two
The latent heat of vaporization of water is roughly 10 times the latent heat of fusion of water. The amount of heat required to boil away 1 kg of water is 10 times the amount of heat required to melt 1 kg of ice
Indicate whether the statement is true or false
A sprinter runs 100.0 m in 9.87 seconds. If he travels at constant acceleration for the first 75.0 m and then at constant velocity for the final 25.0 m, what was his peak velocity?
A. 17.7 m/s. B. 17.5 m/s. C. 20.3 m/s. D. 15.4 m/s.
If a galaxy is moving away from us at 1.0% of the speed of light, use Hubble's law to estimate how far away it is from us if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 140 ly B) 14 ly C) 140 thousand ly D) 140 million ly E) 140 billion ly