ME 321 Homework

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Re: Homework 01

Hi Dr Quinn,

I’m having a small confusion with the solutions for problem 5. When computing the dot products to get everything in terms of theta2 it seems that the sign changes on the (j . i2) and it seems to me with would be positive sine since i2 is in the positive j direction. I’m hoping you can help clarify this for me.

Thanks for your help!
United States
Hi Matt,
There is an error in the solutions :-( . On line three the sign of the term in question is wrong, but is then corrected on the following line, so the final answer is correct.
Yes I see the error now, the double negative in the previous line does change it too positive.