Log in
Physics
1
answer
0
watching
154
views
9 Nov 2019

A high-speed flywheel in a motor is spinning at 500rpm when a powerfailure suddenly occurs. The flywheel has mass 43.0kg and diameter76.0cm . The power is off for 31.0s and during this time theflywheel slows due to friction in its axle bearings. During thetime the power is off, the flywheel makes 160 completerevolutions.

At what rate is the flywheel spinning when the power comes back on?in rad/s

please show your work

Watch
1
answer
0
watching
154
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Trinidad Tremblay
Trinidad TremblayLv2
9 Nov 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

In a Beams ultracentrifuge, the rotor is suspended magneticallyin a vacuum. Since there is no mechanical connection to the rotor,the only friction is the air resistance due to the few airmolecules in the vacuum. If the rotor is spinning with an angularspeed of 5.1x105 rad/s and the driving force is turnedoff, its spinning slows down at an angular rate of 0.38 rad/s2.

(a) How long does the rotor spin before coming to rest?
(b) During this time, through how many revolutions does the rotorspin?

In a Beams ultracentrifuge, a 19.5 cm long rotor is suspendedmagnetically in a vacuum. Since there is no mechanical connectionto the rotor, the only friction is the air resistance due to thefew air molecules in the vacuum. If the rotor is spinning with anangular speed of 4.8 105 rad/s and the driving force is turned off,its spinning slows down at an angular rate of 0.39 rad/s2.
(a) For a point at the end of the rotor, find the initialspeed.
answer is 0.936 e5 m/s

(b) For a point at the end of the rotor, find the tangentialacceleration component.
answer is 0.0761 m/s2

(c) For a point at the end of the rotor, find the maximum radialacceleration component.
answer is 4.49e+10m/s2

A loaded ore car has a mass of 950 kg and rolls on tails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 30.0° above the horizontal. The car accelerates uniformly to a speed of 2.20 m/s in 12.0 s and then continues at constant speed.

(a) What power must the winch motor provide when the car is moving at a constant speed?

(b) What maximum power must the winch motor provide?

(c) What total energy has transferred out of the motor by work by the time the car moves off the end of the track, which is of length 1250 m? 

Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in