Which of the Terrestrial planets is considered a "water world"?
a. Mercury
b. Venus
c. Earth
d. Mars
e. Neptune
c
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Flow channels on Venus suggest it was once rich in water
a. True b. False Indicate whether the statement is true or false
Time Dilation: A spaceship enters the solar system moving toward the Sun at a constant speed relative to the Sun. By its own clock, the time elapsed between the time it crosses the orbit of Jupiter and the time it crosses the orbit of Mars is 50.0 minutes. How fast is the spaceship traveling towards the Sun? The radius of the orbit of Jupiter is 778 × 109 m, and that of the orbit of Mars is 228 × 109 m.
A. 0.319c B. 0.438c C. 0.522c D. 0.671c E. 0.982c
A quarterback of mass 85 kg is running at 10 m/s. Also, a tackle of mass 100 kg is running at 9 m/s.
A. The tackle has the greater kinetic energy B. The quarterback has the greater kinetic energy C. The quarterback and the tackle have equal kinetic energies
At what minimum rate is a 60.0-kg boy converting his internal energy when, in 8.00 s, he runs up a flight of stairs that is 10.0-m high?
A) 75.0 W B) 735 W C) 4.80 kW D) 48.0 W