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September 19, 2014

September 19, 2014

Posted by **sophie** on Friday, May 29, 2009 at 7:43pm.

1. Write a cosine function with phase shift 0 for height above water of the initial point after t seconds.

a. h=8cos((2π)/2 t)+7

b. h=-8cos3t+7

c. h=-8cos((2π)/3 t)+7

d. h=8cos3t+7

I think this is C?

2. use your function to find the height of the initial point after 5.5 seconds.

a. 7.5 ft

b. 11 ft

c. 10.4 ft

d. 6.5 ft

- Math -
**bobpursley**, Friday, May 29, 2009 at 8:02pmThe period is clearly 60/20 seconds, or 3 seconds.

the cosine function should be of the form

cos(2PI/period* t)

C. is correct.

- Math -
**sophie**, Friday, May 29, 2009 at 8:26pmso would 2. be C as well?

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