RPM question


NM and ft/lb were the beginning of my transfer to the business school. After the holidays I am back on the road to tinker with rpm ratller thresholds.

Xcentric thanks for the chart!

Thanks for the discussion.
 
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Pop quiz!

My job is to double check lug nut tightness at a tire shop. All lug nuts are supposed to be torqued to a minimum of 100 ft lbs.

Today I checked 1,000 lug nuts with a torque wrench. They were all properly torqued. (NOTE: My boss doesn't care if the lug nuts are over-torqued).

How much work did I do?
 
zero. (but maybe I should not answer.)

Gary we should team up and teach a course....:biggrin.
 
I did no work, but I still got paid minimum wage. What a great job!

However, the truly anal retentive (who me?) might argue that the torque wrench must move 1mm to "click."

Therefore, I moved the torque wrench 1mm x 100 ft lbs per lug nut x 1,000 lug nuts.

So, it took 100,000 ft lbs to move the torque wrench 1 meter.

My right arm is getting huge!
 
Ok, Gary.

Quiz back at you.

How much "power" is this?
 
Well, it took me 8 hours to check the lug nuts.

4.7 watts.
 
Good job again.
The key here is "time" it took to do the work since power is work per unit time.
 
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