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anonymous

  • one year ago

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  1. anonymous
    • one year ago
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    @jim_thompson5910

  2. anonymous
    • one year ago
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  3. jim_thompson5910
    • one year ago
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    your part 1 is correct, but part 2 is not

  4. jim_thompson5910
    • one year ago
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    |dw:1435541483644:dw|

  5. jim_thompson5910
    • one year ago
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    |dw:1435541514136:dw|

  6. jim_thompson5910
    • one year ago
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    |dw:1435541555572:dw|

  7. jim_thompson5910
    • one year ago
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    The period T is found through the formula T = 2pi/B

  8. jim_thompson5910
    • one year ago
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    do you see how to find T?

  9. anonymous
    • one year ago
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    no not really

  10. jim_thompson5910
    • one year ago
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    If you're stuck, then \[\Large T = \frac{2\pi}{B}\] \[\Large T = \frac{2\pi}{\frac{\pi}{15}}\] \[\Large T = \frac{\frac{2\pi}{1}}{\frac{\pi}{15}}\] \[\Large T = \frac{2\pi}{1}\times\frac{15}{\pi}\] \[\Large T = ??\]

  11. anonymous
    • one year ago
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    t=30pi/pi???

  12. jim_thompson5910
    • one year ago
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    the pi's will cancel

  13. anonymous
    • one year ago
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    so 30

  14. jim_thompson5910
    • one year ago
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    yep, the period is 30 seconds that means it takes 30 seconds for the wheel to do one full cycle

  15. jim_thompson5910
    • one year ago
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    in part 1, you should NOT have cos/( it should be cos( there is no division sign between the "cos" and the opening parenthesis

  16. jim_thompson5910
    • one year ago
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    I noticed that just now. But everything else in part 1 looks good

  17. anonymous
    • one year ago
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    can i do part three and you check?

  18. jim_thompson5910
    • one year ago
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    sure

  19. anonymous
    • one year ago
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    actually can you help because i have no idea where to start..

  20. jim_thompson5910
    • one year ago
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    we can graph the h(t) function using desmos. That's probably the easiest way an alternative is to remember that cos(x) has a min of -1. That's the smallest output cosine can give

  21. jim_thompson5910
    • one year ago
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    since the smallest output is -1, you can replace the cos(pi/15t) with -1 and evaluate

  22. anonymous
    • one year ago
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    so itd be cos((pi/15)-1)? orrrr

  23. anonymous
    • one year ago
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    20cos((pi/15)-1)+30?

  24. jim_thompson5910
    • one year ago
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    \[\Large 20*\cos\left(\frac{\pi}{15}t\right) + 30\] \[\Large 20*(-1) + 30 = ??\]

  25. jim_thompson5910
    • one year ago
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    I replaced all of the cosine with -1

  26. anonymous
    • one year ago
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    hang on ill brb i have to take my dog out

  27. jim_thompson5910
    • one year ago
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    ok

  28. anonymous
    • one year ago
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    okay back lemme look

  29. anonymous
    • one year ago
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    870?

  30. anonymous
    • one year ago
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    or 49? do you add -1 to 30 and then add 20 or?

  31. anonymous
    • one year ago
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    PEMDAS so multiply then add so 20*-1 -20+30=10

  32. jim_thompson5910
    • one year ago
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    20(-1)+30 = 10, yes

  33. jim_thompson5910
    • one year ago
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    that means the lowest on the Ferris wheel is 10 ft off the ground

  34. anonymous
    • one year ago
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    Thank you!

  35. jim_thompson5910
    • one year ago
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    no problem

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