Posted by **Riya** on Thursday, March 29, 2012 at 10:40pm.

A spoked wheel with a radius of 44.0 cm and a mass of 1.90 kg is mounted horizontally on frictionless bearings. JiaJun puts his 0.550-kg guinea pig on the outer edge of the wheel. The guinea pig begins to run along the edge of the wheel with a speed of 18.0 cm/s with respect to the ground. What is the angular velocity of the wheel? Assume the spokes of the wheel have negligible mass.

rad/s

Honestly, I don't know how to calculate this, I have been trying to figure out but I have been guessing, and am sure they aren't write because they gave me wrong answers. Need help thank you in advance.

- physics -
**drwls**, Thursday, March 29, 2012 at 11:25pm
Since the bearings are frictionless, the total angular momentum of wheel and guinea pig remains zero, as they rotate in opposite directions.

0.18 m/s*0.550kg*0.44m

= 0.04356 kg m^2/s

= -Iwheel*w

The moment of inertia of the wheel is

Iwheel = M*R^2 = 1.90*(0.44)^2

= 0.3678 kg*m^2. Therefore

w = -0.118 rad/s

The minus sign indicates that it is turning in the opposite direction from the guinea pig.

- physics -
**Riya**, Thursday, March 29, 2012 at 11:41pm
Thank you so much; I really appreciate it!

## Answer this Question

## Related Questions

Physics - A spoked wheel with a radius of 44.0 cm and a mass of 1.90 kg is ...

physics - A large wooden wheel of radius R and the moment of inertia I is ...

Physics - A cord is wrapped around the rim of a wheel .250 m in radius, and a ...

Physics - The wheel of a car has a radius of 0.288m and is being rotated at 830 ...

Physics - A 6 kg grinding wheel of radius 0.2 m rotates at a constant rotational...

physics - a wheel radius 0.25 m is mounted on a frictionless horizontal axle. ...

Math - One popular ride at carnivals is the Roundabout, which works in the ...

Science - A 6 kg grinding wheel of radius 0.2 m rotates at a constant rotational...

College Physics - A wheel of radius 0.398 m is mounted on a frictionless ...

physics - A large grinding wheel in the shape of a solid cylinder of radius 0....