Dark matter ____
a. is homogenously distributed through the Universe
b. began clumping due to tiny variations in density at the moment of the big bang
c. began clumping due to large variations in the distribution of matter and antimatter
d. is isotropically distributed through the Universe
e. began clumping due to the variations in the distribution of baryonic matter
b
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When a light beach ball rolling with a speed of 6 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be approximately
A) 3 m/s. B) 12 m/s. C) 6 m/s. D) 18 m/s. E) 0.
Determine R when I = 0.20 A and ? = 18 V.
A. 50 ? B. 8.0 ? C. 10 ? D. 20 ? E. 30 ?
Time Dilation: A 30-year-old astronaut goes off on a long-term mission in a spacecraft that travels at speeds close to that of light. The mission lasts exactly 20 years as measured on Earth. Biologically speaking, at the end of the mission, the astronaut's age would be
A. more than 50 years. B. exactly 50 years. C. less than 50 years. D. exactly 30 years. E. exactly 25 years.
The output power of an ideal transformer is
A) greater than the input power. B) equal to the input power. C) smaller than the input power. D) may be any of the above