Physics Help Forum Newtons second law

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 Oct 20th 2008, 06:14 PM #1 Member   Join Date: Sep 2008 Posts: 42 Newtons second law A crane lifts a shark with a mass of 2.00 x 10^4 kg off the ground. The net is steadily accelerated from rest to 1.0 m/s in a time interval of 2.55 s. Calculate the magnitude of the tension in the cable pulling the net. I dont understand. Can someone help?
Oct 20th 2008, 06:24 PM   #2
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If the shark in the net is not moving in the up/down direction, the magnitude of the tension in the cable is the magnitude of the weight of the shark. That is $\displaystyle mg$. But as there is an acceleration (the shark is getting pulled), the tension in the cable is $\displaystyle m(g+a)$, where a is the acceleration of the net.
So work out
 The net is steadily accelerated from rest to 1.0 m/s in a time interval of 2.55 s.
in order to get the acceleration of the shark. Once you get it, plug it into the formula $\displaystyle T_{cable}=m(g+a)$ and you're done.
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