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Why is a man hole cover round?

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10 respuestas

8

There are a few answers that would qualify as "correct", but I suspect this question won't be making the rounds much longer as this is becoming the stereotypical case example question which is meant to "see how you think". A circular manhole cover can never fall into the hole, as a square cover could by turning it on a diagonal, for example. Also, a worker can easily roll the cover without every having to lift it.

Adam en

3

In addition to Adam's answers, they are also round because they will fit on the manhole regardless of which way you put them on.

Tim en

5

The real reason manhole covers are round is because the manhole is round. It certainly wouldn't do to put a square cover on a round hole. (However, that's likely not the answer they are looking for.)

Dave en

4

Weight displacement. So the cover does not fall into the hole no matter where it is or what is on it.

Anónimo en

1

This was a Microsoft interview question at one point. It is round so that the cover can't fall into the hole the way a square or rectangular cover could if inserted diagnally. It's also easier to move (by rolling it).

CN en

1

It's also the maximum coverage for the minimal amount of material - making it the cheapest shape in terms of material cost.

Tim en

0

It is simply because if it was rectangular it would fall in, and since they are a circles it can fit any way you turn it.

Anónimo en

0

In addition to Adam's observations (which contain the very best answers to this question), a round manhole cover has no sharp corners, so if for any reason it did not sit right in the manhole, and a car or truck ran over it, it would be less likely to puncture the vehicle's tire.

KC en

1

Because if it were star-shaped it would have pointy bits that would be ouchy and tear your clothing.

Jeff in Boston en

0

Because the manhole pipe is round.

Maryann en

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