# Homework Help: Simple question about spring constant

1. Nov 5, 2006

### metalmagik

I received a spring constant on the problem below to be .005 N/m.

I was wondering if this was even possible? When I got the frequency in the next part of the question, the frequency made sense, but i never thought a spring constant could come out to be so small.

A small fly of mass 0.13 g is caught in a spider's web. The web vibrates predominately with a frequency of 1.0 Hz.

(a) What is the value of the effective spring constant k for the web?

(b) At what frequency would you expect the web to vibrate if an insect of mass 0.54 g were trapped?

So is .005 N/m an acceptable spring constant? Thanks to anyone who responds.

2. Nov 5, 2006

### OlderDan

Any spring constant is possible. It appears you have done the calculation correctly.

3. Nov 5, 2006

### metalmagik

ah it's not right! here's my work:

omega = 2pi f

k=.005 N/m

i apologize for not using latex, but I do not know how to input omega and whatnot into it. Please help me with this problem!

4. Nov 5, 2006

### OlderDan

Why do you think it is not right? You could go out another decimal place to get more precision, and should since you were given 2 significant figures in the data. Other than that it looks OK.

5. Nov 5, 2006

### metalmagik

No but, I entered it in Webassign and it told me it was not correct. The answers in web assign should be to 3 sig figs. Do you know what I am doing wrong?

6. Nov 5, 2006

### metalmagik

can anyone help me with this problem pleasee? It's the last one I have on my webassign, I need a 100! thank you

7. Nov 5, 2006

### OlderDan

.005N is only 1 significant figure. If they are expecting three, you need to give them 3.