Wednesday

October 22, 2014

October 22, 2014

Posted by **Lira** on Friday, May 2, 2014 at 4:03am.

- College Algebra & Trigonometry -
**Steve**, Friday, May 2, 2014 at 6:24amwhat's the problem? You have the formula:

x(t) = 2cos(5pi t + pi/3)

just solve

2cos(5pi t + pi/3) = 3/2

cos(5pi t + pi/3) = 3/4

cos .722 = .75

so,

5pi t + pi/3 = .722 or 2pi-.722=5.560

t = (.722-pi/3)/5pi = -.021 or 6.262

t = (5.560-pi/3)/5pi = .287

see the graph at

http://www.wolframalpha.com/input/?i=solve+2cos%285pi+t+%2B+pi%2F3%29+%3D+3%2F2

You need to find the next occurrence after 0.287 by noting that the period is 0.4

**Answer this Question**

**Related Questions**

College Algebra and Trigonometry - A weight is attached to an elastic spring ...

College Algebra and Trigonometry - A weight is attached to an elastic spring ...

Physics - A vertical spring has one end attached to the ceiling and a 2.50 kg ...

math - A weight attached to a spring is pulled down 4 inches below the ...

math - A weight attached to a spring is pulled down 4 inches below the ...

math/trig - A weight attached to a spring is pulled 4 inches below the ...

math - A weight attached to a spring is pulled down 4 inches below the ...

physics - One end of a massless coil spring is suspended from a rigid ceiling. ...

physics - One end of a massless coil spring is suspended from a rigid ceiling. ...

College Algebra - Hooke's Law states that the distance a spring stretches is ...