Rotation

[boedi_hehe]

hi..
does anyone now how to solve this problem

A wagon wheel 0.7m in diameter consists of a thin rim having a mass of 7kg and six spokes each having a mass of 1.4kg. Determine the moment of inertia of the wagon wheel for rotation about its axis

and this problem

A 0.18-kg yo-yo consists of two solid disks of radius 12cm joined together by a massless rod of radius 1.00 cm and a string wrapped around the rod. One end of the string is held fixed and is under constant tension T as the yo-yo is released. Find the acceleration of the yo-yo

[Sirus]

For the first problem, you should be able to recognize to familiar shapes of which the moments of inertia are easy to find. What are the spokes and wheel rim similar to?

Second problem: This problem consists of finding the moment of inertia of the yoyo. Use the same approach as in the first question, then work with torque formulas to find the acceleration.