Question

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how to get an apple without climbing tree?

note:-

Use Newton 's Law of motion​

Answer 1

Answer

(a) Below figure (a) shows the free-body diagrams for this problem.

Note that the same-size force n acts up on Nick and down on chair, and cancels out in the diagram. The same-size force T=250N acts up on Nick and up on chair, and appears twice in the

diagram.

(b) First consider Nick and the chair together as the system. Note that two ropes support the system, and T=250N in each rope.

Applying ∑F=ma,2T−(160N+320N)=ma

where,                 m=9.80m/s2480N=49.0kg

solving for a gives   a=49.0kg(500−480)N=0.408m/s2

(c) On nick, we apply

    ∑F=ma:n+T−320N=ma

    where,     m=9.80m/s2320N=32.7kg

    The normal force is the one remaining unknown

     n=ma+320N−T

substituting, n=(32.7kg)(0.408m/s2)+320N−250N

gives,        n=83.3N

hope it helps