Ф=0,8(t^3+3t^2)

W=dФ/dt=(0,8(t^3+3t^2))=2,4t^2+4.8t

E=dW/dt=(2,4t^2+4.8t)=4.8t+4.8

V=W*R W=V/R=36/1.6=22.5 c^-1

W=2πn n=W/2п=22,5/2*3,14=3,6 оборота