College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 39

In Fig. 8.23, a mass m descends a vertical distance from rest. (Neglect friction and the mass of the string.) (a) From the conservation of mechanical energy, will the linear speed of the descending mass be (1) greater than, (2) equal to, or (3) less than
Why (b) If m = 1.0 kg, M = 0.30 kg, and R = 0.15 m, what is the linear speed of the mass after it has descended a vertical distance of 2.0 m from rest