Posted by **Kate** on Monday, January 18, 2010 at 12:23pm.

A fisherman's scale stretches 2.8 cm when a 3.7-kg fish hangs from it. (a) What is the spring constant? (b) What will be the amplitude and frequency of vibration fi the fish is pulled down 2.5 cm more and released so that it vibrates up and down?

I have a question about finding the frequency. For some reason I keep on getting ((3.7 / 129.5)^.5) / (2 * pi) = 0.0269020955 that for my answer but the back of the book says 3.0 hz

- jishka, Math -
**GuruBlue**, Monday, January 18, 2010 at 12:33pm
please put the subject in the subject line.

- physics -
**Kate**, Monday, January 18, 2010 at 12:50pm
i did for some reason it changes it

- jishka -
**Damon**, Monday, January 18, 2010 at 1:23pm
3.7kg * 9.8 = 36.26 N

stretch distance = .028 m

so

k = 36.26/.028 = 1295 N/m

F = m a

-kx = m a

if x = A cos 2pi f t

a = -A (2 pi f)^2 cos 2 pi f t

so

-k A cos 2 pi f t = -mA (2 pi f )^2 cos 2 pi f t

(2 pi f)^2 =k/m

(2 pi f)^2 = 1295/3.7 = 350

2 pi f = 18.7

f = 2.98 Hz

- ap history -
**heather**, Sunday, February 12, 2012 at 2:25am
was the new Deal essentially a conservative attempt to save American capitalism from collapse, a radical change in traditional American antigovernment beliefs, or a moderate liberal response to a unique crisis? please help i tried reading but confuse. im leaning towards conservative attempt. need help badly before monday. thanks so much.

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