Which would require the greater change in a satellite's orbital speed (8 km/s); slowing down so it crashes into Earth, or speeding up so it escapes Earth?
A) slowing down
B) speeding up
C) same each way
D) need more information
Answer: A
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An electron has a kinetic energy that is twice its rest energy. Determine its speed.
A. 0.76c B. 0.81c C. 0.94c D. 0.54c E. 0.87c
Which of the following is a similarity between Frederick W. Taylor and Lillian Gilbreth?
a.They both developed time study. b.They both strove to simplify work. c.They both proposed giving workers longer work hours and fewer breaks. d.They both used film cameras to analyze jobs.
You observe a rocket moving away from you. Compared to its length when it was at rest on the ground, you will measure its length to be
1.shorter. 2.longer. 3.the same.
Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny hits the water with kinetic energy of
A) 10 J. B) 500 J. C) 510 J. D) 5000 J. E) more than 5000 J.