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- Homework Statement:
- Shafts A and B connect the gear box to the wheel assemblies of a tractor, and shaft C connects it to the engine. Shafts A and B lie in the vertical yz plane, while shaft C is directed along the x axis. Replace the couples applied to the shafts by a single equivalent couple, specifying its magnitude and the direction of its axis.

- Relevant Equations:
- M=RXF

I reslove Ma and Mb into y and z component.

Ma=1200sin(20)j+1200cos(20)k

Mb=900sin(20)j+1200cos(20)k

Mc=-840i

I looked at the solution and it states that the y component of Ma is negative (-1200sin(20)j+1200cos(20)k). I understand that Mc is -840i because it is Clockwise. How do you determine the sign of Ma and Mb for their y and z component.

Many times for your time answering my question.

Ma=1200sin(20)j+1200cos(20)k

Mb=900sin(20)j+1200cos(20)k

Mc=-840i

I looked at the solution and it states that the y component of Ma is negative (-1200sin(20)j+1200cos(20)k). I understand that Mc is -840i because it is Clockwise. How do you determine the sign of Ma and Mb for their y and z component.

Many times for your time answering my question.