If the valve can be opened with a couple moment


If the valve can be opened with a couple moment of 25 N•m, determine the required magnitude of each couple force which must be applied to the wheel.

If the valve can be opened with a couple moment

Image from: Hibbeler, R. C., S. C. Fan, Kai Beng. Yap, and Peter Schiavone. Statics: Mechanics for Engineers. Singapore: Pearson, 2013.

Solution:

As the required couple moment is 25 N•m, we can write an equation to figure out the force required to create such a moment.

25=F(0.15+0.15)

(note we converted mm to m)

F=83.3 N

 

We assumed clockwise moment to be positive, however, if the opposite was assumed, then force F would also be negative, leading to the same answer.

 

This question can be found in Engineering Mechanics: Statics (SI edition), 13th edition, chapter 4, question 4-74.

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