Question

6) A massless turntable is used to play records. Each record is essentially a solid cylinder with a radius of 0.15 m and mass 0.1 kg. There is a constant frictional force of 0.5 N due to a wire rubbing against the record a distance of 0.05 m from the axis of rotation. Answer the following questions assuming that you apply a tangential force on the record with your finger at a distance of 0.1 m from the axis of rotation. a) When playing, the record rotates at a frequency of 33.3 rpm. What angular velocity does this correspond to? b) Calculate the average angular acceleration of the record if it spins from rest to its operating speed after 4 full rotations. c) You apply a tangential force on the record with your finger at a distance of the axis of rotation in order to rotate the record as described above. What must the 0.1 m from magnitude of the force be in order for you to achieve the angular acceleration found in part b). d) How much work does it take to bring the record from rest to it's operating speed?

Answer 1

Week- 43rd 10th Month .) 33.3.n-pm--一0.555-notation-perfect- b. ens 2. 2 242 2 0吐 о"253 N