Wednesday

November 26, 2014

November 26, 2014

Posted by **falcon306** on Saturday, July 23, 2011 at 5:45pm.

Q: A motor spins up the flywheel with a constant torque of 50 {\rm N \cdot m}. How long does it take the flywheel to reach top speed? In units of seconds.

- Physics -
**drwls**, Saturday, July 23, 2011 at 9:09pmTorque = (moment of inertia) x (angular acceleration) = 50 N*m

The moment of inertia is

I = (1/2) M*R^2 = 281.25 kg*m^2

The maximum angular velocity you want to achieve is

w = 1200 rev/min * (2 pi/60) = 125.66 rad/s

The angular acceleration rate is

alpha = 125.66 rad/s / t

where t is the time required.

alpha = 50/281.25 rad/s^2 = 125.66/t

Solve for t in seconds

**Answer this Question**

**Related Questions**

physics - Flywheels are large massive wheels (disks) used to store energy. They ...

physics - To drive a typical car at 40 mph on a level road for one hour requires...

physics - Some special vehicles have spinning disks (flywheels) to store energy ...

Physics - A flywheel is a solid disk that rotates about an axis that is ...

Physics - A bicycle has wheels of radius 0.32 m. Each wheel has a roatational ...

physics - A bicycle is supported so that in front wheel does not touch the road....

A physics question - I was researching amusement park rides for a recent project...

physics - A bicycle has wheels of radius 0.3 m. Each wheel has a rotational ...

physics. - A flywheel is a solid disk that rotates about an axis that is ...

Chemistry - Methane, butane, propane and octane are all simple hydrocarbons. Why...