http://www.ck12.org Chapter 9. Rotational Motion
2.
- The upper pulley has mass of 2kg and a radius of 30cm. The lower pulley has mass of 4kg and a radius of
1.0m. The 12 kg mass is 5m off the ground.
a. With what velocity will the 12kg mass hit the ground ifμk=0?
b. With what velocity will the 12kg mass hit the ground ifμk=0.2?
Solutions:- The energy goes into the heat generated by the friction between your foot and the tire.
2. a. 5.87m/s b. 4.79 m/s