Skid is planning on lining the bottom of his 350 gallon reef tank with specially

Question

Skid is planning on lining the bottom of his 350 gallon reef tank with specially imported gravel from the Giant's Causeway in Scotland. It is shipped to him in two crates, each 275 pounds. They are hoisted up to his penthouse condo on Lake Shore Drive in Chicago via a crane that offers an initial tension in Rope A of 3,000 N which accelerates the crates upward briefly. (a) What is the initial acceleration of the crates? (b) Calculate the tension in Rope B. (c) Which force, TA or TB, is making the bottom box move upwards? Explain why AND why not for the other.

a) 2.21 m/s^2

b) 1500 N

I can't seem to get the work right.

Explanation / Answer

M = m+m = 2m = 2*275*0.454 = 249.7 kg

Fnet = T-Mg = 3000 - (2*275*0.454*9.8) = 552.94 N

a = Fnet /M = 2.21 m/s^2

b) T b = m*(g+a) = 1500 N

Tb

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