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elisichi

  • 3 years ago

Math question! Help please! Semester test tomorrowww!!

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  1. elisichi
    • 3 years ago
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    There it is :(

  2. elisichi
    • 3 years ago
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    The answer for part B, the one I don't get is 3050, but I don't know how to get there.

  3. mathstudent55
    • 3 years ago
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    |dw:1355067118226:dw|

  4. InYourHead
    • 3 years ago
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    Who told you the answer for B is 3050? That's not what I came up with.

  5. InYourHead
    • 3 years ago
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    Even though that's a REALLY big number, I realize I forgot to calculate the internal diameter. Hold on.

  6. InYourHead
    • 3 years ago
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    Okay. I think I've got the answer. Can you tell me how you started this problem?

  7. elisichi
    • 3 years ago
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    The textbook says that..

  8. InYourHead
    • 3 years ago
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    Textbook's wrong. Over THREE THOUSAND washers can be carved from one square meter of metal?

  9. elisichi
    • 3 years ago
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    Yes, so I did 3/0.0004= 7500 and thats the number of washers for question a

  10. InYourHead
    • 3 years ago
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    How did you get .0004?

  11. elisichi
    • 3 years ago
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    Oh my gosh, never mind I get it!!

  12. InYourHead
    • 3 years ago
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    What do you get?

  13. InYourHead
    • 3 years ago
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    You know the formula for the area of a circle is (3.14 * r^2) ? That's why I have no idea where you got the .0004

  14. elisichi
    • 3 years ago
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    So it is 3050 :)

  15. InYourHead
    • 3 years ago
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    What's 3050?

  16. InYourHead
    • 3 years ago
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    Here's what I did: I figured out the diameter of the entire washer. The washer's EXTERNAL DIAMETER is 2 cm. That means that the radius is 1 cm. And that means that the area is 3.14 cm squared, which is the same as .0314 meters squared.

  17. InYourHead
    • 3 years ago
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    I found the AREA of the entire washer, sorry. That's .0314 meters squared.

  18. InYourHead
    • 3 years ago
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    But the washer has a hole. So now we have to find the area of the hole. The DIAMETER of the hole (INTERNAL diameter) is 1 cm. That means that the AREA of the hole is.... (3.14 * .5 squared), which is .785 cm squared.

  19. InYourHead
    • 3 years ago
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    If you subtract that from 3.14 cm squared, you get 2.36 cm squared, which is the same as .0236 meters squared.

  20. InYourHead
    • 3 years ago
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    Can you tell me how you got .0004?

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