The 8 kg, 37-cm diameter disk in the figure is spinning at 421 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 8 seconds?
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- The wheels of a sport car go from rest to 3000 rpm in 3 second. Its angular acceleration a is rad/s?. Type your answer.a computer hard drive rotates at 5400 rpm. what angular acceleration will get it up to speed in just 150 revolutions starting from rest?A 250 g , 25-cm diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1900 rpm in 4.7 s ? Express your answer in newton-meters.
- An optical disk drive in your computer can spin a disk up to 10,000 rpm (about 1045 rad/s). If a particular disk is 968.7 rad/s while it is being read, and then is allowed to come to rest over 0.301 seconds, what is the magnitude of the average spun at angular acceleration of the disk? average angular acceleration: 3278.07 rad s2 If the disk is 0.12 m in diameter, what is the magnitude of the tangential acceleration of a point 1/7 of the way out from the center of the disk? 26.22 tangential acceleration: IncorrectA three-blade wind turbine, which spins perpendicularly to the ground, is set on a pole that is 38 m tall and completes 5 revolutions in one minute. The length of one blade is approximately 4 m long. One particular blade lies parallel to the ground before the turbine started to spin. b) What is the height of the tip of the blade after one second from start?A turntable is off and is not spinning. A 0.9 g ant is on the disc and is 14 cm away from the center. The turntable is turned on and 1.4 s later it has an angular speed of 33 rpm. Assume the angular acceleration is constant and determine the following quantities for the ant 0.7 s after the turntable has been turned on. Express all quantities using appropriate mks units. a => W = V= atan arad a= Fnet
- A flywheel is rotating at an angular velocity of 8 rad/s. It slows down at a rate of 2 rad/s?. How many revolutions will the flywheel make before coming to a stop?A turbine is spinning freely at 3750 rpm. It takes 8 min to coast to a stop due to friction in the bearings. How many revolutions doe the turbine make while stopping? Express your answer in revolutions.June started winding up her arm holding a baseball, moving it around her shoulder in a circle, to get ready to throw. June’s arm is 0.5 m long and moves at an angular velocity of 2 rad/s. How much time will 10 revolutions take? What is the velocity of the baseball when she let go of it?
- A 20 cm diameter circular saw blade spins at 3900 rpm. How fast would you have to push a straight hand saw to have the teeth move through the wood at the same rate as the circular saw teeth?Three children are riding on the edge of a merry-go-round that is 122 kg, has a 1.60 m radius, and is spinning at 15.3 rpm. The children have masses of 19.9, 28.5, and 36.8 kg. If the child who has a mass of 28.5 kg moves to the center of the merry-go-round, what is the new angular velocity in rpm? rpm t.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?