Posted by **Oisin** on Thursday, August 5, 2010 at 5:11pm.

(i)For the wheel of diameter 10 cm, find its final speed after traversing a distance of 10 m down an incline of 25º. Assume it starts from rest.

I know i have to use the conservation of energy but how?

i don't understand where to start off

- Physics -
**bobpursley**, Thursday, August 5, 2010 at 5:20pm
loss of GPE= gainoflinearKE+gainrotationalKE

You are going to have to decide if the wheel is a hoop, or a solid disk to find the moment of inertia.

Remember, for each 2PI radians of rotation, the wheel moves linearly 2PIr distance.

if w is the angular speed, then rw is the linear velocity.

g*m*10cos25=1/2 I w^2+1/2 M(rw)^

and once you decide solid wheel or hoop, you fill in for I, and then solve for w.

- Physics -
**Oisin**, Friday, August 6, 2010 at 5:20am
Wow thanks very much

I was usig the wrong formula for loss of PE that's where i went wrong its always helpful to have people to tell you where youve gone wrong

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