What is "uniform motion?"
a. smooth motion
b. motion with zero acceleration
c. motion with constant velocity
d. motion at a constant speed
e. motion along a straight path
b, c
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Isaac Newton concluded that a force from Earth had to act on the Moon because:
A) some force is needed to pull the Moon away from Earth. B) some force is needed to keep the Moon in a straight-line motion. C) some force is needed to keep the Moon in motion in its orbit. D) some force is needed to accelerate the Moon toward Earth.
An observer sees two spaceships, S1 and S2, each having the same length in its own rest frame, traveling toward each other along parallel lines from opposite directions, with equal speeds relative to the observer
As seen by this observer, the two spaceships have the same length and, when they are next to each other, the nose of one coincides with the tail of the other, and vice-versa. However, as seen by passengers on either one of the spaceships, the other spaceship is shorter than their own, so if the tail of the other spaceship is in line with the nose of their spaceship, the nose of the other spaceship cannot be lined up with the tail of theirs. How can you explain this discrepancy?
The energy dissipated in a light bulb in a circuit is provided by the
A) lamp filament itself. B) wires leading to the lamp. C) voltage source. D) none of the above
If you stand in front of a concave mirror, exactly at its center of curvature,
A) you will see your image and you will appear smaller. B) you will see your image and you will appear larger. C) you won't see your image because there is none. D) you won't see your image because it's focused at a different distance. E) you will see your image at your same height; however it will be inverted.