What is the self-inductance of a solenoid 30.0 cm long having 100 turns of wire and a cross-sectional area of 1.00 × 10-4 m2? (?0 = 4? × 10-7 T • m/
A)
A) 4.19 nH
B) 4.19 pH
C) 4.19 µH
D) 4.19 mH
E) 4.19 H
C
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Of all the terrestrial planets, ________ has the largest daily temperature variation.
A. Earth B. Mars C. Mercury D. Venus
In the Ptolemaic model, retrograde motion is due to
A) relative motion between the Earth and another planet in its orbit B) the Earth reversing the direction of its orbit about the Sun C) a planet moving backwards in its smaller circular circle, the center of which moves in a larger circular orbit around the Earth D) a planet reversing the direction of its orbit about the Sun
A common opinion concerning the creationism versus evolution controversy is the idea that Earth was created fairly recently but that it was created with fossils and other evidence of great age already present, so that Earth has the appearance of
being very old even though it is really quite young. This opinion is best classified as A) a scientific hypothesis for which there is currently insufficient evidence. B) a scientific opinion that is probably incorrect. C) nonscientific because it contradicts common sense. D) nonscientific because there is no conceivable scientific way to disprove it. E) a scientific opinion that is certainly incorrect.
The small piston of a hydraulic lift has a diameter of 8.0 cm, and its large piston has a diameter of 40 cm. The lift raises a load of 15,000 N. Assume the pistons each have negligible weight
(a) Determine the force that must be applied to the small piston. (b) Determine the pressure applied to the fluid in the lift.