Post a New Question

Calculus Hard Question

posted by on .

A pendulum swings through an arc length of 1120 cm (Swing #1). With each further swing, the arc length is reduced by 15 %

State the growth factor.

Calculate the length of the arc in swing #5

I think im supposed to use this formula again, but I don't know how to use it. Tn = ar^n-1

  • Calculus Hard Question - ,

    swing #1 : 1120
    swing#2: 1120(.85) = 952
    swing #3 : 952(.85) or 1120(.85)^2 = 809.2
    ..
    swing#5 = 1120(.85)^4 = 584.647 cm

  • Calculus Hard Question - ,

    Where did you get 0.85 from?

  • Calculus Hard Question - ,

    100% - 15% = 85% = .85

  • Calculus Hard Question - ,

    Ok wait, sorry sorry. I actually messed writing the question. Its supposed to be 120 cm, not 1120 cm. But you're still right, the growth factor is 0.85m but I don't know how you got that:\

  • Calculus Hard Question - ,

    swing#5 = 120(.85)^4 = 63?

  • Calculus Hard Question - ,

    yes, to the nearest cm , I had 62.64

  • Calculus Hard Question - ,

    But I checked the answer, and it says its 73.695 :S

  • Calculus Hard Question - ,

    Ok, maybe I messed up writing the whole thing, I'll rewrite it again.

    A pendulum swings through an arc of 120 cm (Swing #1)
    With each further swing, the arc length is reduced by 15%

    State the growth factor

    Calculate the length of the arc in Swing #4

  • Calculus Hard Question - ,

    Their answer is wrong.

    According to your typing

    swing#1 = 120
    swing #2 = 120(.85) =
    swing#3 = 120(.85)^2
    swing #4 = 120(.85)^3 = 73.695
    swing#5 = 120(.85)^4 = 62.64

    Their answer would be for the 4th swing.

  • Calculus Hard Question - ,

    Oh ok, thanks so much, it was all because of my typing mistake :S Sorry about that.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question