When the weight of a spinning top, which causes it to tip over, combines with the top's rapid rotation and makes its axis sweep out the shape of a cone, that motion is known as _____
A) precession
B) revolution
C) conjunction
D) eccentricity
A
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The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?
A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108
A layer of kerosene (n = 1.45) is floating on water (n = 1.33). For what angles of incidence at the kerosene-water interface will light be totally internally reflected within the kerosene?
A student plots data for the velocity of a body versus the time on a graph. The area under the curve on the graph may be identified as
A. average velocity. B. distance. C. average speed. D. acceleration.
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 15 cm past the first lens. The second lens has a focal length of 40 cm. The final image
A) is real and upright. B) is virtual and upright. C) is real and inverted. D) is virtual and inverted. E) cannot be determined with the information given.