If observations had shown that the cosmic microwave background was perfectly smooth (rather than having very slight variations in temperature), then we would have no way to account for
A) the relationship between the strong and the weak force.
B) the fact that our universe is expanding.
C) how galaxies came to exist.
D) the existence of helium in the universe.
C
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Which type of force would be the equal and opposite force to a gravitational force?
a. gravitational b. electromagnetic c. strong d. weak e. It could be any one of the above or some combination of them.
The surfaces of a Dewar flask are silvered for the purpose of minimizing heat transfer by what process?
a. conduction c. convection b. radiation d. vaporization
Sue and Betti both ski straight down a hill, both starting from rest. Sue weighs more than Betti. Neglecting friction and wind resistance, which skier will be moving the fastest at the bottom of the hill?
A) They will be moving with the same speed. B) Sue C) Betti
Energy in Capacitors: Doubling the potential across a given capacitor causes the energy stored in that capacitor to
A. quadruple. B. double. C. reduce to one-half. D. reduce to one-fourth.