Two couples act on the frame

Mechanical Engineering Jan 12, 2021

Two couples act on the frame. d = 4 ft. (Figure 1)

Part A

Determine the couple moment of the 80-lb forces.

Express your answer in terms of the unit vectors i, j, and k. Use the 'vec' button to denote vectors in your answers. Express your answer using three significant figures.

Part B

Determine the couple moment of the 50-lb forces.

Express your answer in terms of the unit vectors i, j, and k. Use the 'vec' button to denote vectors in your answers. Express your answer using three significant figures.

Part C

Select the correct expression for the sum of the moments of all the force components about point A.

	MC=?45(80)(3)+45(80)(7)+50cos(30?)(2)?50cos(30?)(5)
	MC=?45(80)(3)?45(80)(7)+50cos(60?)(2)?50cos(60?)(5)
	MC=?45(80)(3)+45(80)(7)+50cos(60?)(2)?50cos(60?)(5)
	MC=?45(80)(3)?45(80)(7)+50cos(30?)(2)?50cos(30?)(5)

Part D

Determine the resultant couple moment.

Express your answer in terms of the unit vectors i, j, and k. Use the 'vec' button to denote vectors in your answers. Express your answer using three significant figures.

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