[填空题]
A grinding wheel is a unifo9.sbtp*jnhkx)p3- c(wbdpm +/h m fs6 r4cy;-(,4fe3lgzf o h,wbbo tym cylinder with a radius of 8.50 cm and a mass of 0.580 kg. 4fc4bltwfo-b ,heozg,3 yy( ;Calculate (a) its moment of inertia about its center, $\approx$ $kg \cdot m^2$ (b) the applied torque needed to accelerate it from rest to 1500 rpm in 5.00 s if it is known to slow down from 1500 rpm to rest in 55.0 s。 $m \cdot N$