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Using the formula for torque, how much force must be applied to a 24-inch-long torque wrench to achieve 250 foot-pounds of torque?

A. 120 lbs
B. 125 lbs
C. 135 lbs
D. 167 lbs

Answer :

To solve this problem, we start with the formula for torque:

$$
T = F \times r
$$

where
- $T$ is the torque,
- $F$ is the applied force, and
- $r$ is the length of the lever arm.

The problem gives the torque as $250$ foot-pounds and the wrench length as $24$ inches. First, we need to convert the wrench length to feet because the torque is given in foot-pounds. Since there are $12$ inches in a foot, we have:

$$
r = \frac{24 \text{ inches}}{12 \text{ inches/foot}} = 2 \text{ feet}
$$

Now, rearrange the torque formula to solve for the force:

$$
F = \frac{T}{r}
$$

Substitute the values:

$$
F = \frac{250 \text{ ft-lb}}{2 \text{ ft}} = 125 \text{ lbs}
$$

Thus, a force of $\boxed{125 \text{ lbs}}$ must be applied to achieve $250$ foot-pounds of torque.

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Rewritten by : Barada