A cart starts with velocity v and rolls up the frictionless path shown. At what point is the kinetic energy greatest?
A. 1
B. 2
C. 3
D. 4
A. 1
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Earth's rotation axis is approaching Polaris today
a. True b. False Indicate whether the statement is true or false
During the period of one day, the number of high tides at a given location is about __________
Fill in the blank(s) with correct word
In a test of equipment the following procedure is carried out. Spacecraft ?1 is traveling at 0.75c and fires a laser pulse in the forward direction at Spacecraft ?2, which is testing its device that measures the speed of laser pulses as they pass by the spacecraft. Spacecraft ?2 is traveling at 0.95c in a direction away from Spacecraft ?1 . The device is working properly, and the speed of
the pulse as it passes is successfully measured. What is the speed of the laser pulse measured in this case? a. 0.80c b. 0.70c c. c d. This is a question that cannot be answered without knowing in which reference frames the speeds given in the problem. If you agree, then this is the answer that you should choose.
If a ray of light passes from air into glass, the angle of incidence will be
a. less than the angle of refraction. b. sometimes greater and sometimes less than the angle of refraction. c. greater than the angle of refraction. d. equal to the angle of refraction.