Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.The work you do is
a. 0 b. 4 J.
c. 100 J. d. none of the above.
c
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The ratio of the speed of light in a vacuum to the speed of light in a medium is known as the index of
a. reflection. b. refraction. c. diffraction. d. none of these.
Sally, who weighs 450 N, stands on a skate board while Roger pushes it forward 13.0 m at constant velocity on a level straight street. He applies a constant 100 N force
a. The work Roger does on the skateboard is 0 J. b. The work Roger does on the skateboard is 1 300 J. c. The work Sally does on the skateboard is 1 300 J. d. The work Sally does on the skateboard is 5 850 J. e. The work Roger does on the skateboard is 5 850 J.
A horizontal 2.00-m long, 5.00-kg uniform beam that lies along the east-west direction is acted on by two forces. At the east end of the beam, a 200-N forces pushes downward. At the west end of the beam, a 200-N force pushed upward
What is the angular acceleration of the beam? A) 240 rad/s2 north B) 1.33 × 102 rad/s2 north C) zero D) 240 rad/s2 south E) 1.33 × 102 rad/s2 south
Pulsars could not be ordinary stars that are pulsating because the pulses are too short
a. True b. False Indicate whether the statement is true or false