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Chapter 4: Q.75 (page 109)
A painted tooth on a spinning gear has angular acceleration , where t is in s. Its initial angular velocity, at , is . What is the tooth鈥檚 angular velocity in rpm at ?
The tooth鈥檚 angular velocity is .
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15. In the Olympic shotput event, an athlete throws the shot with an initial speed of 12.0 m/s at a angle from the horizontal. The shot leaves her hand at a height of 1.80 m above the ground. How far does the shot travel?
A ball is thrown toward a cliff of height h with a speed of 30 m/s and an angle of 60掳 above horizontal. It lands on the edge of the cliff 4.0 s later.
a. How high is the cliff?
b. What was the maximum height of the ball?
c. What is the ball鈥檚 impact speed?
11. II A ball thrown horizontally at travels a horizontal distance of before hitting the ground. From what height was the ball thrown?
12. A physics student on Planet Exidor throws a ball, and it follows the parabolic trajectory shown in FIGURE EX4.12. The ball's position is shown at 1s intervals until. At , the ball's velocity is localid="1647396327258" .
a. Determine the ball's velocity at , and .
b. What is the value of g on Planet Exidor?
c. What was the ball's launch angle?
A rubber ball is dropped onto a ramp that is tilted at 20掳, as shown in FIGURE P4.59. A bouncing ball obeys the 鈥渓aw of reflection,鈥� which says that the ball leaves the surface at the same angle it approached the surface. The ball鈥檚 next bounce is 3.0 m to the right of its first bounce. What is the ball鈥檚 rebound speed on its first bounce?
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