Which of the following are predictions of inflation theories?
A. The cosmic microwave background must be uniform.
B. The Universe expanded rapidly over a short period of time.
C. The smaller initial size of the Universe allowed thorough mixing.
D. All of these choices are correct.
Answer: D
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An astronaut in space swings a ball attached to a string in a circular motion. If the string suddenly breaks, how will the ball move?
A) It will move in a straight line in whichever direction it was moving when the string broke. B) It will continue to move in the same circular path it had been following before the string broke. C) It will instantly come to a stop. D) It will move toward the astronaut. E) It will move in a large elliptical path around the astronaut.
Atoms in crystals are typically separated by distances of 0.10 nm. What KE must an electron have, in eV, in order to have a wavelength of 0.10 nm?
What will be an ideal response?
How massive are the largest known galaxies?
A) a few million solar masses B) a hundred million solar masses C) a few billion solar masses D) a trillion solar masses E) hundreds of trillions of solar masses
Which is more energetically favorable, biogas or ethanol? Does your answer differ at different places? Explain
What will be an ideal response?