A compact disk of diameter 8 cm starts from rest and speeds up uniformly to 2 rev/s in 4.0 seconds.  What is the tangential acceleration of a point on the outer rim of the disk moving at 3 rev/s?

The wheels of a car speed up from 2.7 rad/sec to 6.8 rad/sec in 1.1 seconds. What is the angular acceleration of the wheels?

A ceiling fan is rotating counterclockwise with a constant angular acceleration of 0.40? rad/s2 about a fixed axis perpendicular to its plane and through its center. Assume the fan starts from rest.

(a) What is the magnitude of the tangential acceleration of a bug on the rim of a 13.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 75.0 rev/min in 4.50 s? 0.2881 m/s² (b) When the disk is at its final speed, what is the magnitude of the tangential velocity of the bug? 1.296 m/s (c) One second after the bug starts from rest, what is the magnitude of its tangential acceleration? 0.2881 ✓ m/s² (d) One second after the bug starts from rest, what is the magnitude of its centripetal acceleration? X Your response differs from the correct answer by more than 100%. m/s² (e) One second after the bug starts from rest, what is its total acceleration? (Take the positive direction to be in the direction of motion.) magnitude m/s² direction o from the radially inward direction

The tires of a car make 85.0. revolutions as the car reduces its speed uniformly from 90.0 km/hr to 60.0 km/hr. The tires have a diameter of 0.90 m. What is the angular acceleration? If the car continues to slow down at this rate, how much more time is required to stop?

(a) What is the magnitude of the tangential acceleration of a bug on the rim of a 13.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 80.0 rev/min in 3.70 s? m/s2(b) When the disk is at its final speed, what is the magnitude of the tangential velocity of the bug? m/s(c) One second after the bug starts from rest, what is the magnitude of its tangential acceleration? m/s2(d) One second after the bug starts from rest, what is the magnitude of its centripetal acceleration? m/s2(e) One second after the bug starts from rest, what is its total acceleration? (Take the positive direction to be in the direction of motion.) magnitude                                                        m/s2 direction                                 ° from the radially inward direction

A child of mass 40 kg stands beside a circular platform of mass 115 kg and radius 1.6 m spinning at 3.4 rad/s. Treat the platform as a disk. The child steps on the rim. What is the new angular speed? in rad/s  She then walks to the center and stay there. What is the angular velocity of the platform then? in rad/s What is the change in kinetic energy when she walks from the rim to the center of the platform? in J

An optical disk drive in your computer can spin a disk up to 10,000 rpm (about 1045 rad/s1045 rad/s). If a particular disk is spun at 734.1 rad/s734.1 rad/s while it is being read, and then is allowed to come to rest over 0.368 seconds0.368 seconds, what is the magnitude of the average angular acceleration of the disk?   If the disk is 0.12 m0.12 m in diameter, what is the magnitude of the tangential acceleration of a point 1/71/7 of the way out from the center of the disk?

An ultracentrifuge accelerates from rest to 100,000 rpm in 2.30 min. (a) What is its angular acceleration in rad/s2?      _________rad/s2 (b) What is the tangential acceleration of a point 10.7 cm from the axis of rotation?_________m/s2   (d) Express this radial acceleration as a multiple of g._________g

An optical disk drive in a computer can spin a disk at up to 10,000 rpm. If a particular disk is spun at 6170 rpm while it is being read, and then is allowed to come to rest over 0.368 s, what is the magnitude of the average angular acceleration of the disk?