Some people wish that we lived in a recollapsing universe that would eventually stop expanding and start contracting. For this to be the case, which of the following would have to be true (based on current understanding)?
A) Dark energy is the dominant form of energy in the cosmos.
B) Dark energy does not exist and there is much more dark matter than we are aware of to date.
C) Neither dark energy nor dark matter really exist.
D) Dark energy exists but dark matter does not.
B
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One of the predictions of Kepler's laws of planetary
motion is that a) the planets move in circular orbits. b) for a non-circular orbit, the closer a planet is to the Sun the faster it travels. c) planets nearer the Sun have the longest orbital periods. d) all planets move in elliptical orbits around Earth. •
What are the standard candles used to determine that the universe is accelerating?
A: spiral galaxies B: elliptical galaxies C: Type Ia supernovae D: light bulbs E: Type II supernovae formed from the death of massive stars
A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. He slides all the way down to the valley bottom where his gravitational potential energy becomes zero. His kinetic energy at the bottom will be
a. 0 J c. some value between 0 and 500 J b. 500 J d. none of the above
GPS stands for
a. the metric system of measurement b. grams per second c. Global Positioning System d. a space shuttle e. none of the above