p05 065

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65.

(a) Since the performer’s weight is (52)(9.8) = 510 N, the rope breaks.

(b) Setting T = 425 N in Newton’s second law (with +y upward) leads to

T

− mg = ma =⇒ a =

T

m

− g

which yields

|a| = 1.6 m/s

2

.


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