Physics Help Please?

Question

The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 40 N⋅m . You plan to tighten the plugs by pulling on the end of a 26-cm-long wrench. Because of the cramped space under the hood, you'll need to pull at an angle of 125 ∘ with respect to the wrench shaft.

A)With what force must you pull?

PLEASE EXPLAIN ALL PARTS OF EQUATION AND WHAT THEY MEAN FOR BEST ANSWER.(please don't just put pi rad MR etc explain what it is)

A)With what force must you pull?

PLEASE EXPLAIN ALL PARTS OF EQUATION AND WHAT THEY MEAN FOR BEST ANSWER.(please don't just put pi rad MR etc explain what it is)

Andrew Smith · Answer

F * x = T
F = T/ x = 40 / 0.26  = 154 N perpendicular to the shaft.

But F = F applied * cos( theta) where theta is measured from the perpendicular.
which also means that F = F applied * |sin(theta)|
Fapplied = F / |sin(theta)|
= 154 / |sin(125)|
= 188 N

? · Answer

Use a proper torque wrench instead, and you won't have to worry about it.

Physics Help Please?

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