A UFO is
A) an unidentified object seen in the sky
B) an alien spaceship
C) a hoax
D) a natural phenomenon
A
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Which of the following observations is not a piece of evidence supporting the Big Bang theory?
A) darkness of the night sky B) recession speeds of far away galaxies relative to close ones C) observed helium abundance in the universe D) relative motions of galaxies in the Local Group
An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2
To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom. If the time is 6.3 s, what is the depth of the crater? A) 10 m B) 14 m C) 26 m D) 32 m E) 38 m
The air resistance of falling is greatly affected by an object's frontal area and
A) mass. B) weight. C) speed.
Two projectiles are launched at 100 m/s, the angle of elevation for the first being 30° and for the second 60°. Which of the following statements is false?
a. Both projectiles have the same acceleration while in flight. b. The second projectile has the lower speed at maximum altitude. c. Both projectiles have the same range. d. All of the above statements are true.