If you stand in front of a double-concave mirror, exactly at its center of curvature, your image will appear where you are, but
A) larger and upside down.
B) the same size and upside down.
C) larger and upright.
D) the same size and upright.
B
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Light is reflected when
A) electron clouds of atoms are energized. B) atomic nuclei are made to vibrate. C) incident light is returned into the medium from which it came. D) electromagnetic waves emanate from matter.
What happens to the half-life of a radioactive substance as it decays?
A) It remains constant. B) It increases. C) It decreases at a constant rate. D) It decreases at an exponential rate.
A 4.00 kg solid sphere of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. If the length of the incline is 50.0 cm, then the velocity of the center of mass of the solid sphere at the bottom of the incline is
A. 1,750 J. B. 2,000 J. C. 2,250 J. D. 2,670 J. E. 2,900 J.