What is the primary effect the carbon dioxide in Venus' atmosphere has on the planet?
What will be an ideal response?
The high concentration of carbon dioxide has caused a runaway greenhouse effect that results in very high surface temperatures.
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If grand unified theories are correct, what caused inflation at the end of the GUT era?
A) Gravity was an extremely weak force at this period in time. B) Large amounts of matter and antimatter annihilated at this time. C) There wasn't enough matter present to slow down the expansion at that time. D) The universe was too small and needed to grow quickly. E) An enormous amount of energy was released when the strong force froze out (became distinct) from the GUT force.
A particle (m = 20 mg, q = -5.0 mC) moves in a uniform electric field of 60 N/C in the positive x direction. At t = 0, the particle is moving 25 m/s in the positive x direction and is passing through the origin. How far is the particle from the origin at t = 2.0 s?
a. 80 m b. 20 m c. 58 m d. 10 m e. 30 m
Which of these statements is true?
a. a battery produces ac and a generator produces dc b. a battery and a generator produce ac c. a battery and a generator produce dc d. a battery produces dc and a generator produces ac
Lydia proposes to send an interstellar probe off in stages. The first stage, traveling radially outward at 0.500c relative to Earth, will send off a second stage traveling in the same direction as the first stage at a speed of 0.500c relative to the first stage. Finally, the second stage will send off a third stage traveling in the same direction at 0.500c relative to the second stage. Relative
to Earth, the speed of the third stage will have a magnitude of a. 0.500c. b. 0.800c. c. 0.929c. d. 0.972c. e. 1.500c.