Man-Hours

Agent Smith said:
I don't understand how we can multiply "men" with "hours"? 🤔
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It's the same as "heating degree-days", "kilowatt-hours", "foot-pounds", and so on. Like those, it makes a new compound unit, called "man-hours" or "worker-hours", representing the quantity of work done by that many workers in that much time.
 
Agent Smith said:
@khansaheb I have some idea regarding rates (one quantity being divided by another quantity), but man-hours doesn't make sense. @Dr.Peterson can you link me to a video I can watch?
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How come division makes sense - as in 'rates' - but 'multiplication' does not. Those are just inverse of one-another, as long as '0' is excluded from the domain. Multiplication by '20' is same division by '1/20'.
 
Agent Smith said:
@khansaheb I have some idea regarding rates (one quantity being divided by another quantity), but man-hours doesn't make sense. @Dr.Peterson can you link me to a video I can watch?
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You could search for a video yourself. I have no idea what kind would be helpful to you.

Why not state exactly what you object to in the idea of "man-hours", rather than just say it "doesn't make sense [to you]", so someone can actually answer you? What is it about the idea that you think is wrong? Evidently it is not the concept of multiplying two units, since you don't seem to object to "kilowatt-hour" or "Newton-meter" and the rest. So what, exactly, is it?
 
Dr.Peterson said:
You could search for a video yourself. I have no idea what kind would be helpful to you.

Why not state exactly what you object to in the idea of "man-hours", rather than just say it "doesn't make sense [to you]", so someone can actually answer you? What is it about the idea that you think is wrong? Evidently it is not the concept of multiplying two units, since you don't seem to object to "kilowatt-hour" or "Newton-meter" and the rest. So what, exactly, is it?
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Same issue (I think) as 2 apples + 3 oranges.
 
Agent Smith said:
Same issue (I think) as 2 apples + 3 oranges.
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That doesn't answer my question. Do you not recognize that we DO multiply different units, though we can't add them? That ought to suggest that there's a difference worth thinking about. It is NOT the same thing, so you need to actually think about what makes multiplication different. So far you're just feeling.

What do you actually find wrong about Newton-meters, or whatever?
 
Dr.Peterson said:
That doesn't answer my question. Do you not recognize that we DO multiply different units, though we can't add them? That ought to suggest that there's a difference worth thinking about. It is NOT the same thing, so you need to actually think about what makes multiplication different. So far you're just feeling.

What do you actually find wrong about Newton-meters, or whatever?
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khansaheb said:
2 apples + 3 oranges = 5 fruits.,...... unit changed
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So something similar to the above is happening when we multiply? 🤔
 
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