Aristotle's hypothesis was that:
A) lunar eclipses were created by our shadow.
B) only a spherical Earth would always cast a circular shadow on the Moon.
C) lunar eclipses would have to happen every full moon.
D) the Sun lay at the center of the planet orbits.
E) the Moon orbited the Earth.
B
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Given that Earth's actual distance from the Sun varies by less than 3% over the course of a year, why does the diagram look so elliptical?
A) It correctly shows that Earth is closest to the Sun at points A and C and farthest at points B and D. B) The elliptical shape is an effect of perspective, since the diagram shows an almost edge-on view of a nearly circular orbit. C) The shape of the diagram is meaningless and is done only for artistic effect.
A device that produces electricity by transforming chemical energy into electrical energy is called a
A) generator. B) transformer. C) battery. D) none of the given answers
At the time of the winter solstice (the start of winter), the Sun is
a. farthest south of the celestial equator. b. farthest north of the celestial equator. c. on the celestial equator moving north. d. on the celestial equator moving south.
Number 10 copper wire (radius = 1.5 mm) is commonly used for electrical installations in homes. What is the voltage drop in 20 m of #10 copper wire if it carries a current of 12 A? (The resistivity of copper is 1.7 × 10^?8 ??m.)
a. 0.58 V b. 0.48 V c. 2.7 V d. 2.4 V e. 0.34 V