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?
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
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