If you watched the history of the universe like a movie playing backward, what would you see?
A. Objects getting farther apart.
B. The Universe becoming denser.
C. The temperature of the Universe decreasing.
D. Regions of space becoming smaller.
E. More than one of the above.
Answer: E. More than one of the above.
B and D
- The Universe becoming denser.
- Regions of space becoming smaller.
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Light of the wavelength to be measured is deflected by 34.9° in the second order. What is the wavelength of this light?
The motion of a particle connected to a spring is described by x = 10 sin (?t). At what time (in s) is the potential energy equal to the kinetic energy?
a. 0 b. 0.25 c. 0.50 d. 0.79 e. 1.0
A sphere of pure U-235 will explode if it is
A) hot enough. B) shaken hard enough. C) big enough. D) none of the above
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