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 thats where i went wrong its always helpful to have people to tell you where youve gone wrong

## Answer This Question

## Related Questions

- Physics - (ii) For the wheel of diameter 10 cm, find its final speed after ...
- Physics - (b) Given that Icm = ½MR2 for a uniform solid wheel, (i) show that ...
- Physics - A 16 kg mass is attached to a cord that is wrapped around a wheel with...
- Physics - A 2.84 kg block starts from rest at the top of a 30° incline and ...
- physics - A 3.00 kg block starts from rest at the top of a 30° incline and ...
- Physics - A 2.90 kg block starts from rest at the top of a 30° incline and ...
- Physics - A 2.90 kg block starts from rest at the top of a 30° incline and ...
- Physics - A bicyclist starts from rest and accelerates at a constant rate for 15...
- Physics - A 2.92 kg block starts from rest at the top of a 30° incline and ...
- physics - need help with this question please a 1kg block starts at rest and ...

More Related Questions