(adsbygoogle = window.adsbygoogle || []).push({}); Pulley Tension friction help??

1. The problem statement, all variables and given/known data

http://www.flickr.com/photos/72384417@N06/6533043261/ [Broken] by LiFK1, on Flickr

Mass1 = 0.750 kg

Mass2 = 0.52 kg

Fk=2.1 N

g= 9.8 N

2. Relevant equations

F=ma

Mass1(gravity)= (Mass1+mass2)Acceleration

T + m2g - fk = (m1 + m2)a

3. The attempt at a solution

Mass1(gravity)= (Mass1+mass2)Acceleration

7.35=(0.750kg+0.52kg)A

5.787 N = A

T + m2g - fk = (m1 + m2)a

T + 0.52kg(9.8)-2.1=1.27(5.78)

T = 4.35 N

rounded up T = 4.4N

Apparently the answer to this is 4.2 N, but i cant seem to get it.

Can someone tell me what im doing wrong?

thanks in advance.

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# Homework Help: Pulley Tension friction help?

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