Q.

When an empty lift is moving down with an acceleration of g4ms−2 , the tension in the cable is 9000N. When the lift is moving up with an acceleration of g3ms−2 , the tension in the cable is,

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a

16,000N

b

18,000N

c

12,000N

d

15,000N

answer is A.

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Detailed Solution

9000=m(g−g4) 3mg4=9000 mg=12000N T=m(g+g3)      =43mg       =43×12000=16000N
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When an empty lift is moving down with an acceleration of g4ms−2 , the tension in the cable is 9000N. When the lift is moving up with an acceleration of g3ms−2 , the tension in the cable is,