# Physics

posted by .

The wheel is attached to an electric generator and the rotation rate drops from 290 to 230 in 3.5 . What is the average power output?

• Physics -

units???

• Physics -

To start off, I will assume that 290 and 230 are in terms of rpm.

Pave=(Kf-Ki)/t

t=3.2

K=1/2*I(inertia)*w(omega)^2

Inertia of disc= 1/2*m*r^2

W must be in terms of rad/s, so multiply each rpm term by 2pi/30.

Kf-Ki= (1/2)*(1/2*m*r^2)*(Wf^2-Wi^2)

Divide Kf-Ki by t and you will get average power.

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### Physics

A bike wheel rotates uniformly through 2 revolutions in 3 seconds. a) what is the period of the wheel's rotation?
2. ### Physics

A passenger bus in Zurich, Switzerland derived its motive power from the energy stored in a large flywheel. The wheel was brought up to speed periodically, when the bus stopped at a station, by an electric motor, which could then be …
3. ### Physics

Fairgoers ride a Ferris wheel with a radius of 5.00 {\rm m} . The wheel completes one revolution every 31.5 s What is the average speed of a rider on this Ferris wheel?
4. ### physics

A 64 kg hiker climbs to the top of a 3700 m-high mountain. The climb is made in 5.5 h starting at an elevation of 2900 m. Calculate the average power output in watts. Calculate the average power output in horsepower & Calculate assuming …
5. ### physics

A large wooden wheel of radius R and the moment of inertia I is mounted on an axle so as to rotate freely. A bullet of mass m and speed v is shot tangential to the wheel and strike its edge, lodging in the wheel’s rim. If the wheel …
6. ### Physics (please help!!)

The Crab pulsar (m=2.00x10^30 kg) is a neutron star located in the Crab Nebula. The rotation rate of the Crab pulsar is currently about 30.0 rotations per second, or 60.0pi rad/s. The rotation rate of the pulsar, however, is decreasing; …
7. ### Physics

A wheel of arduous 30 cm is rotating at a rate of 2.0 revolutions every 0.080 s. Through what angle, in radians, does the wheel rotate in 1.0 s?
8. ### physics

If all the solid waste of 230 million tonnes were burned in waste-to-energy power plants that are 20% efficient, a) how many kilowatt-hours of electrical energy could be produced in a year?
9. ### physics

If all the solid waste of 230 million tonnes were burned in waste-to-energy power plants that are 20% efficient, a) how many kilowatt-hours of electrical energy could be produced in a year?
10. ### math

A stirring blade is attached at the level of the center of the wheel. Find the distance from the center of the wheel to the stirrer blade for 30° and 225° angles of rotation. The radius is 2ft and the rod of the blade attached to …

More Similar Questions