Some double-pane airplane windows darken when the inner pane is rotated. The panes are
A) thin films.
B) Polaroid filters.
C) optical fibers.
Answer: B
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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.
The slowing of clocks in strongly curved space time is known as
a. gravitational radiation. b. time dilation. c. gravitational curvature. d. gravitational redshift. e. hyperspace drag.
A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0 × 10-6 K-1. At 22°C the period of swing of the pendulum is 1.00 s
If the temperature is reduced to 5°C, how much time does the clock gain or lose in one day? A) It gains 18 s per day. B) It loses 18 s per day. C) It gains 9.0 s per day. D) It loses 9.0 s per day. E) It neither gains nor loses time.
A coil lies flat on a level tabletop in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger
When viewed from above, what is the direction of the induced current in this coil as the field increases? A) counterclockwise B) clockwise C) clockwise initially, then counterclockwise before stopping D) There is no induced current in this coil.