A lens of focal length 20 cm has an object of height 3.0 cm placed 100 cm in front of it. The image distance in this case is
A)
33 cm.
B)
20 cm.
C)
25 cm.
D)
17 cm.
E)
-25 cm.
C
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A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is less than 90°, their resultant is
A) less. B) the same. C) greater.
Significant Figures: If a circle has a radius of 1.109 m, what is its area expressed to the correct number of significant figures?
A. 3.86 m2 B. 3.863 m2 C. 3.864 m2 D. 3.8638 m2 E. 3.86379 m2
When a gas expands adiabatically,
A) the internal energy of the gas decreases. B) the internal energy of the gas increases. C) there is no work done by the gas. D) work is done on the gas. E) heat flows out of the system.
A 1000-kg car traveling at 70 m/s takes 3 m to stop under full braking. The same car under similar road conditions, traveling at 140 m/s, takes ______________ m to stop under full braking
a. 6 b. 1 c. 3 d. 12 e. 11