If all the "dark matter" in our universe were to be instantaneously removed, which of the following would not happen?
A) The Milky Way would fly apart.
B) Clusters of galaxies would fly apart.
C) The universe would expand forever.
D) The Solar System would fly apart.
E) All of the above
D
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When boarding an airplane you bring a bag of chips. While in flight the bag puffs up, because
A) air pressure in the air-tight bag is greater than cabin air pressure. B) suction is occurring. C) air pressure is affected by the Bernoulli principle. D) all the above E) none of the above
On a scale where the distance from Earth to the Sun is about 15 meters, the distance from Earth to the Moon is
A) small enough to fit within your hand. B) about 1 meter. C) about 5 meters. D) about 30 meters.
A rock is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration of objects in free fall is 2.5 m/s2 and there is no atmosphere. How long does it take for the rock to return to where it was thrown?
A) 6.0 s B) 8.0 s C) 10 s D) 12 s
A 100 W lightbulb has an energy efficiency of 5%. It is turned on for one minute. Its total energy output during this minute is
A) 6000 J. B) 300 J. C) 5700 J. D) impossible to determine because we don't know the voltage. E) impossible to determine because we don't know the power.