A hoop rolls down a 4.75 m high hill without slipping. What is the final speed of the hoop, in meters per second?

6.82 m/s

Explanation:

Given

Height of hill

Suppose r is the radius of hoop and m be its mass

So moment  of inertia is given by

Using conservation of energy we get

Potential energy at top=Kinetic+Rotational energy at bottom

where

v=velocity of hoop

  (without slipping)

the reason is because the moon has some form of gravity, and that gravity pulls the ocean tides.

okay i have so many questions. but the big one here is: um wt..f is this mess? ?