An object falls freely from rest on a planet where the acceleration due to gravity is 20 m/s2. After 5 seconds, the object will have a speed of
A) 5 m/s.
B) 10 m/s.
C) 20 m/s.
D) 50 m/s.
E) 100 m/s.
Answer: E
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Mars has a sufficient mass and a low enough temperature that water molecules could exist in its atmosphere as vapor. One reason Mars' atmosphere does not contain a significant amount of water vapor is that
a. Mars formed in a part of the solar nebula that lacked oxygen. b. Mars formed in a part of the solar nebula that lacked hydrogen. c. All of the water vapor was released in the impact that formed Deimos. d. Ultraviolet radiation breaks the water molecule into less massive particles that can escape. e. The water molecule combines readily with chlorine to form hydrochloric acid.
When we look into the band of light in our sky that we call the Milky Way, can we see distant galaxies? Why or why not?
A) Yes, they appear as small, fuzzy patches on the other side of our galaxy. B) No, because there are only galaxies above and below the plane of the Milky Way. C) No, because the stars, gas, and dust of the Milky Way block us from seeing them. D) Yes, there are many other galaxies that we see inside the Milky Way.
Seismic P-waves can be detected worldwide from any strong epicenter
Indicate whether the statement is true or false
How large a force is necessary to stretch a 2.0-mm diameter copper wire (Y = 11 × 10^10 N/m2) by 1.0%?
a. 2.1 kN b. 3.5 kN c. 6.9 kN d. 11 kN e. 5.4 kN