A 12.0 V battery is placed across a 4.00
resistor. If the current through the resistor is 2.80 A, what is the internal resistance of the battery?
A. 0.200
B. 0.290
C. 4.29
D. 3.71
E. 0.800
B. 0.290
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In the time between two closest approaches to Earth, Venus rotates almost exactly five times relative to the Sun. The consequence of this is that:
A) Earth always presents the same face to Venus at inferior conjunction. B) Venus always presents the same face to Earth at inferior conjunction. C) Venus presents the opposite hemisphere to Earth at each inferior conjunction. D) Venus presents the opposite hemisphere to Earth at each superior conjunction. E) Venus' rotation is completely unrelated to the distant Earth.
A 60-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 25 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder
a. 1.4E+1 N b. 1.6E+2 N c. 2.4E+2 N d. 2.7E+2 N e. 4.2E+3 N
Suppose you see a photo showing Jupiter half in sunlight and half in shadow (i.e., a first-quarter Jupiter). This photo might have been taken by
A) the Keck telescope, on Mauna Kea, Hawaii. B) the Arecibo radio telescope in Puerto Rico. C) the Hubble Space Telescope (which orbits Earth). D) the Juno spacecraft that is orbiting Jupiter.
Fusion is used to produce the largest nuclei known to exist
a. True b. False Indicate whether the statement is true or false