Which force did Kepler believe moved the planets around the Sun?
a. electricity
b. inertia
c. light from the Sun
d. gravity
e. magnetism
e
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The "surface" of a black hole is known as the _______________
a. core b. corona c. photosphere d. event horizon
In a series circuit, the most power is dissipated where the resistance is ________.
What will be an ideal response?
Plane Mirrors: As you walk away from a plane mirror on a wall, the height of your image
A. gets smaller. B. may or may not get smaller, depending on where the observer is positioned. C. is always a real image, no matter how far you are from the mirror. D. changes from being a virtual image to a real image as you pass the focal point. E. is always the same size.
Astronomers infer that the universe is expanding because distant galaxies all appear to
A) be growing in size. B) be moving away from us, with more distant ones moving faster. C) be made mostly of dark matter. D) rotate rapidly.