I cant figure out part B. Ive tried 3.17 and 0.106 and both are incorrect? Probl

Question

I cant figure out part B. Ive tried 3.17 and 0.106 and both are incorrect?

Problem 5.23 Part A If the elevator has an upward acceleration of 2.50 s and the balance reads 70.0 N, what is the true weight of the fish? A large fish hangs from a spring balance supported from the roof of an elevator Wrue= 55.8 N SubmitMy Answers Submit Give Up Correct Part B Under what circumstances will the balance read 39.0 N? We take the positive direction of the acceleration to be upward ? acceleration of the elevator0.106 in's Submit My Answers Give Up Incorrect; Try Again; 3 attempts remaining Part C What will the balance read if the elevator cable breaks? F= 0 N Submit My Answers Give Up Correct

Explanation / Answer

upward acceleration, a=2.5 m/sec^2

weight, F=70 N

a)

when the elevator is in upward direction,

F=m*(g+a)

70=m*(9.8+2.5)

mass of the body(fish), m=5.7 kg

true weight, W=m*g

W=5.7*9.8

W=55.8 kg

b)

here,

weight w=39 N

use.

W=m*(g+a)

39=5.7*(9.8+a)

====> acceleration, a=-2.96 m/sec^2 --------> answer

here, elevator is accelerating downward

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