As shown, a submarine hatch door is to be opened by applying two oppositely orie

Question

As shown, a submarine hatch door is to be opened by applying two oppositely oriented forces of equal magnitude F = 35.01b at points A and 8 on the hatch door wheel. The radii of the Wheel's inner and outer rings are r1 = 1.50 ft and r2 = 0 .700 ft , respectively. (Figure 1) Calculate the moments M A and M b about point D for the forces applied at points A and B. Then, determine the resulting couple moment M r . Assume that a positive moment produces a counterclockwise rotation whereas a negative moment produces a clockwise rotation. Express your answers numerically in pound-feet to three significant figures separated by commas.

Explanation / Answer

They are both counterclockwise so both positive

M=F*d
Ma= 35(R1+R2)
Mb= 35(R1-R2)
Mr=35(R1+R2-R2+R1)=70R1

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