A figure skater spins at the end of her routine, and slows down with an angular acceleration of 1.2 radians per second squared. If she initially spun with a period of 0.2 seconds, how many turns does she go through while slowing to a stop?
A. 65
B. 6
C. 33
D. 15
A. 65
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A 5.00 kg mass is located at (1.0 m, 0.00 m, 3.00 m), a 2.00 kg mass is located at (0.00 m, 3.00 m, –2.00 m), and a 3.00 kg mass is located at (–1.0 m, –2.00 m , 0.00 m). The center of gravity of the system of masses is
A. (1/10m, 10/10m, 1/10m). B. (2/10m, 0m, 11/10m). C. (3/10m, 2/10m, 10/10m). D. (10/10m, 2/10m, 3/10m). E. (2/10m, 10/10m, 0m).
A hunter points a rifle horizontally and holds it 3.30 m above the ground. The bullet leaves the barrel at 325 m/s. Ignore air and assume that free-fall acceleration is 9.80 m/s2
(a) How long does it take for the bullet to strike the ground? (b) How far horizontally does it travel?
John throws a baseball from the outfield from shoulder height, at an initial velocity of 41.5 m/s at an initial angle of 40.0° with respect to the horizontal. The ball is in its trajectory for a total interval of 5.00 s before the third baseman catches it at an equal shoulder-height level. (Assume air resistance negligible.) What is the ball's horizontal displacement?
a. 159 m b. 267 m c. 174 m d. zero e. 495 m
A wave having a frequency of 1000 Hz vibrates at
A) less than 1000 cycles per second. B) 1000 cycles per second. C) more than 1000 cycles per second. D) none of the above