Two objects are thrown from the top of a tall building and experience no appreciable air resistance. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?
A) The one thrown up is traveling faster.
B) The one thrown down is traveling faster.
C) They are traveling at the same speed.
Answer: C
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Free Fall: To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water? Neglect air resistance.
A. 2.3 s B. 2.6 s C. 2.9 s D. 3.2 s E. 3.6 s
Of the four gases CO2, H2O, N2, and O2, which are greenhouse gases?
A) Only CO2 B) CO2 and H2O C) CO2 and N2 D) all except O2 E) all four
When light from the air enters a raindrop, the light
A) slows down. B) remains at speed c. C) speeds up. D) none of the above
Which planet has a large moon with retrograde motion?
a. Jupiter b. Saturn c. Uranus d. Neptune