Priscilla is working out in the gym with a 2.00-kg mass that she holds in one hand and gradually lifts up and down.

a) Will Priscilla find it easier to lift the mass if she pivots her arm at the shoulder or at the elbow?
b) If Priscilla's arm is 0.60 m long from her shoulder to her palm and 0.28 m long from her elbow to her palm, how much torque must she produce in each case to lift the weight?