Find the tension in an elevator cable if the 1 500-kg elevator is descending with an acceleration of 2.8 m/s2, downward
a. 1.9E+4 N
b. 1.1E+4 N
c. 4.2E+3 N
d. 2.7E+1 N
e. 2.1E+2 N
b
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Light of wavelength 6.9 × 10^?7 m has an energy of: (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s)
a. 2.9E–19 J b. 9.6E–20 J c. 3.1E–19 J d. 4.3E–20 J e. 3.2E–20 J
Jacques and George meet in the middle of a lake while paddling in their canoes. They come to a complete stop and talk for a while. When they are ready to leave, Jacques pushes George's canoe with a force to separate the two canoes
What is correct to say about the final momentum and kinetic energy of the system if we can neglect any resistance due to the water? A) The final momentum is in the direction of but the final kinetic energy is zero. B) The final momentum is in the direction opposite of but the final kinetic energy is zero. C) The final momentum is in the direction of and the final kinetic energy is positive. D) The final momentum is zero and the final kinetic energy is zero. E) The final momentum is zero but the final kinetic energy is positive.
The ______ tags instruct a website to display different image size or formats (or no image) based on the size of the screen.
A.
A 3 solar mass main sequence star is at a larger distance than a 0.4 solar mass main sequence star. Which star appears brighter?
A. The 3 solar mass main sequence star. B. We cannot tell with the information given. C. The 0.4 solar mass main sequence star. D. The stars are approximately the same brightness. E. It depends on the phase of the Moon.