Suppose you exert a force of 190 N tangential to the outer edge of a 1.55-m radius 74-kg grindstone (which is a solid disk). a. What is the torque tau, in newton meters, you are exerting on the grindstone, relative to the center of mass of the grindstone?
b. What is the angular acceleration of the grindstone alpha_0, in radians per square second, assuming negligible friction?

I) a gas contained within a piston-cylinder assembly undergoes two processes, a and b, between the same end states, 1 and 2, where p1 = 10 bar, v1 = 0.1 m3 , u1 = 400 kj and p2 = 1 bar, v2 = 1.0 m3 , u2 = 200 kj: ' process a: process from 1 to 2 during which the pressure-volume relation is pv = constant. ' process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to state 2. kinetic and potential energy effects can be ignored. for each of the processes a and b, a) sketch the process on a p-v diagram. b) evaluate the work, in kj. c) evaluate the heat transfer, in kj.(ans : qb,12 = -65.0 kj)