GO A bowler throws a bowling ball of radius R = 11 cm along a lane. The ball (Fig. 11-38) slides on the lane with initial speed v com, 0 = 8.5 m/s and initial angular speed ω 0 = 0. The coefficient of kinetic friction between the ball and the lane is 0.21. The kinetic frictional force f → k acting on the ball causes a linear acceleration of the ball while producing a torque that causes an angular acceleration of the ball. When speed v com has decreased enough and angular speed ω has increased enough, the ball stops sliding and then rolls smoothly. (a) What then is v com in terms of ω ? During the sliding, what are the ball’s (b) linear acceleration and (c) angular acceleration? (d) How long does the ball slide? (e) How far does the ball slide? (f) What is the linear speed of the ball when smooth rolling begins? Figure 1-38 Problem 15.
GO A bowler throws a bowling ball of radius R = 11 cm along a lane. The ball (Fig. 11-38) slides on the lane with initial speed v com, 0 = 8.5 m/s and initial angular speed ω 0 = 0. The coefficient of kinetic friction between the ball and the lane is 0.21. The kinetic frictional force f → k acting on the ball causes a linear acceleration of the ball while producing a torque that causes an angular acceleration of the ball. When speed v com has decreased enough and angular speed ω has increased enough, the ball stops sliding and then rolls smoothly. (a) What then is v com in terms of ω ? During the sliding, what are the ball’s (b) linear acceleration and (c) angular acceleration? (d) How long does the ball slide? (e) How far does the ball slide? (f) What is the linear speed of the ball when smooth rolling begins? Figure 1-38 Problem 15.
Solution Summary: The author explains that by using the given radius and center of mass velocity, a ball can be accelerated.
GO A bowler throws a bowling ball of radius R = 11 cm along a lane. The ball (Fig. 11-38) slides on the lane with initial speed vcom, 0 = 8.5 m/s and initial angular speed ω0 = 0. The coefficient of kinetic friction between the ball and the lane is 0.21. The kinetic frictional force
f
→
k
acting on the ball causes a linear acceleration of the ball while producing a torque that causes an angular acceleration of the ball. When speed vcom has decreased enough and angular speed ω has increased enough, the ball stops sliding and then rolls smoothly. (a) What then is vcom in terms of ω? During the sliding, what are the ball’s (b) linear acceleration and (c) angular acceleration? (d) How long does the ball slide? (e) How far does the ball slide? (f) What is the linear speed of the ball when smooth rolling begins?
Figure 1-38 Problem 15.
Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .
air is pushed steadily though a forced air pipe at a steady speed of 4.0 m/s. the pipe measures 56 cm by 22 cm. how fast will air move though a narrower portion of the pipe that is also rectangular and measures 32 cm by 22 cm
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