A 3.0 cm tall statue is 24. cm in front of a concave mirror. The mirror radius of curvature is 20. cm
(a) Is the image real or virtual?
(b) How far is the image from the mirror?
(c) Is the image upright or inverted?
(d) How high is the image?
(a) real
(b) 17. cm
(c) inverted
(d) 2.1 cm
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The capacitive reactance of an RLC circuit is 64
If the frequency is doubled, what is the new capacitive reactance?
A. 18
B. 64
C. 32
D. 8.0
E. 4.0
The H-R diagram is a diagram plotting the stars according to their
A. luminosity and temperature. B. spectral type and temperature. C. mass and diameter. D. brightness and luminosity class. E. apparent brightness and temperature.
For every natural process, the entropy of the universe
a. is destroyed. b. decreases. c. increases. d. remains constant.
A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the change in frequency (in Hz) heard by an observer in the truck as the two vehicles pass each other? (The speed of sound in air is 343 m/s.)
a. 242 b. 238 c. 240 d. 236 e. 234