344 Angular MomentumP11.48(a)τ∑=−=MgRMgR0(b)∑=dLdt, and since ∑=0 , L=constant.Since the total angular momentum of the system is zero, themonkey and bananas move upward with the same speedat any instant, and he will not reach the bananas(until theyget tangled in the pulley). Also, since the tension in the rope isthe same on both sides, Newton’s second law applied to themonkey and bananas give the same acceleration upwards.FIG. P11.48P11.49(a)=× =°=rF rFsin1800Angular momentum is conserved.LLmrvmr vvrvrfiii===(b)Tmv
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