A shopping cart moves with a kinetic energy of 40 J. If it moves at twice the speed, its kinetic energy is
A) 40 J.
B) 80 J.
C) 160 J.
D) not enough information
Answer: C
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The mass of a single galaxy might be found by
a. the double galaxy method. b. the rotation curve method. c. the cluster method. d. any of these methods. e. none of these methods.
At what rate are photons emitted by a 50.0-W sodium vapor lamp if it is producing monochromatic light of wavelength 589 nm? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
What will be an ideal response?
A drop in pressure is an indication of
A) an approaching cold front. B) orographic lifting. C) adiabatic expansion. D) a stationary front.
Potential Energy: A 7.0-?C point charge and a 9.0-?C point charge are initially extremely far apart. How much work does it take to bring the 7.0-?C point charge to the point x = 3.0 mm, y = 0.0 mm, and the 9.0-?C point charge to the point x = -3.0 mm, y = 0.0 mm? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 95 J B. 190 J C. 63 J D. 16 J