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Mechanical Engineering QUESTION #2545
Question 1
For a wrench (screw) resultant, the pitch \(p\) of the wrench is defined as:
  • \(p = \mathbf{R}\times\mathbf{M}_R\)
  • \(p = \frac{|\mathbf{M}_R|}{|\mathbf{R}|}\)✔️
  • \(p = |\mathbf{R}| \cdot |\mathbf{M}_R|\)
  • \(p = \frac{|\mathbf{R}|}{|\mathbf{M}_R|}\)
Correct Answer Explanation
For a wrench, \(\mathbf{M}_R\) is parallel to \(\mathbf{R}\). The pitch is defined as the ratio \(p=M_R/R\) (couple moment per unit force), with units of length.