(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

An elevator weighing 2.00 X10^5 N is supported by a steel cable. What is the tension in the cable when the elevator is accelerated upward at a rate of 3.00m/s^2? (g=9.81m/s^2)

2. Relevant equations

I realize this is probably a very simple problem, but neither my textbook, nor 2 days of searching the web have produced any help. How do I figure this problem out?

3. The attempt at a solution

First I drew an elevator with a cable. In side I put the weight (2.00 * 10^5 N) with an arow pointing down. On the outside I put an the speed (3.00m/s^2) with an up arrow. Then I planed a down arrow with the the amount of gravity (9.81m/s^2). The speed is a positive direction, so i placed a plus sign in front, +3.00m/s^2. For the weight and gravity, since they were negative values, I used a negative sign, -2.00 * 10^5 N, -9.81m/s^2.

From here I wasn't sure what to do, so I added the the factors with the same units. I came up with +3.00 + (-9.81)= -6.81m/s^2. The I multiplied this value by -2.00 * 10^5 N. The answer I came up with is 1.362*10^6 N.

I'm almost positive that it is wrong but im not sure what else to do.

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# Homework Help: Tension in a elevator cable

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