Question 4-5

4. [/2 Points] A disk starts from rest and uniformly increases angular speed to 0.15 rev/s in 35 s. (a) What is its angular acceleration in radians per second per second? l rad/s2 (b) Would doubling the angular acceleration during the given period have doubled final angular speed? 0 Yes O No 5. [/2 Points] An electric motor rotating a workshop grinding wheel at 1.08 x 102 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 1.92 rad/52. (a) How long does it take the grinding wheel to stop? :15 (b) Through how many radians has the wheel turned during the time interval found ll'l part (a)? rad Submit