At the time the hypothesis was suggested, what major problem was identified with the idea that the Sun was powered by gravitational contraction?
A) This process would power the Sun for only about 25 million years, but geologists already had evidence the Earth was much older than that.
B) This process could not possibly lead to the observed power output of the Sun.
C) 19th century astronomers should have been able to measure the required change in the Sun's size.
D) Contracting objects cool down rather than heat up.
A
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Two resistors can be either connected to a battery in series or in parallel. In which case, if either, is the equivalent resistance the smallest?
a) When the two resistors are wired in parallel, the equivalent resistance is less than if they are wired in series. b) When the two resistors are wired in series, the equivalent resistance is less than if they are wired in parallel. c) Both series and parallel wiring will result in the same equivalent resistance. d) It is not possible to know which method of wiring will result in the lowest equivalent resistance without knowing the values of the two resistances.
The figure below shows a container filled with water to the height shown. When we compare the pressure at A to the pressure at B, we find that
a.
.
b.
There is a superforce that separates into the electromagnetic, weak, and strong nuclear forces below a critical temperature
Indicate whether the statement is true or false
The excess charge on this sphere is closest to
A) 700 nC. B) 79 nC. C) 0.35 nC. D) 315 nC. E) 350 nC.