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Best_Mathematician

  • one year ago

calculus help...last two questions...

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  1. Best_Mathematician
    • one year ago
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    @electrokid can u help me with last two

  2. electrokid
    • one year ago
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    how were you able to solve the first ones? You have to picture it and draw it first. Just a little bit of imagination gives the answer right away.

  3. FibonacciChick666
    • one year ago
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    so you got the first three right? now you want a function that shows \[2[ \mathsf { {r}}(t)]\] So what was our original r(t)

  4. FibonacciChick666
    • one year ago
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    btw this isn't dif eq

  5. Best_Mathematician
    • one year ago
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    r(t) = (t-sint)i + (1-cost)j so if it is 2[r(t)] = (2t-2sint)i + (2-2cost)j is it correct?

  6. Cummins5-9
    • one year ago
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    i am not smart

  7. Best_Mathematician
    • one year ago
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    @electrokid is this what you talking about? |dw:1367589459350:dw| i got this part but what abt rest part @FibonacciChick666 r(t) = (t-sint)i + (1-cost)j so if it is 2[r(t)] = (2t-2sint)i + (2-2cost)j is it correct?

  8. electrokid
    • one year ago
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    |dw:1367594323679:dw| this is the diagram I was talking about

  9. Best_Mathematician
    • one year ago
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    how does this diagram relates with vectors

  10. electrokid
    • one year ago
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    |dw:1367594594073:dw| r(t) is the position vector of that small balck strip

  11. Best_Mathematician
    • one year ago
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    oh gotcha...so circumference is the vector function that models the behavior

  12. electrokid
    • one year ago
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    r(t) is the vector function linear distance travelled is easier to analyse by considering curcumference distances

  13. electrokid
    • one year ago
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    r(t) is the position of that small strip on the bigger loop with radius R "r" = radius of smaller loop (confusing symbol, so use another one maybe "a" find a relation between R and "a"

  14. Best_Mathematician
    • one year ago
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    R = 2r....?

  15. electrokid
    • one year ago
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    then what is the relation between "r(t)" and R?

  16. Best_Mathematician
    • one year ago
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    r(t) = 4piR...?

  17. Best_Mathematician
    • one year ago
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    wait r(t) = 2R...correct?

  18. electrokid
    • one year ago
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  19. Best_Mathematician
    • one year ago
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    wow...how did u do that

  20. electrokid
    • one year ago
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    never mind how. but do you see how the question works?

  21. electrokid
    • one year ago
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    I'll let @FibonacciChick666 continue from here

  22. Best_Mathematician
    • one year ago
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    ya circumference is equal to 2pi. It takes 6seconds approx for that circle to complete one revolution

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