I keep getting 120 lbs. Is it supposed to be 120 lbs or 60 lbs. Does anyone know how to solve it so that the answer is D (60 lbs.)? Thanks.
6 comments:
Anonymous
said...
Yeah, I got D. Okay, so what you do is you use the initial numbers given and plug it into F=kx, so it's 10=4k. Solving for k, you get 5/2. Then you replug that into the F=kx equation, and you get F=5x/2. Integrate F=5x/2 from 10 to 14 and you should get 60.
6 comments:
Yeah, I got D. Okay, so what you do is you use the initial numbers given and plug it into F=kx, so it's 10=4k. Solving for k, you get 5/2. Then you replug that into the F=kx equation, and you get F=5x/2. Integrate F=5x/2 from 10 to 14 and you should get 60.
I did integrate 5x/2 from 10 to 14 and I got 120.. how did you get 60? Am I integrating wrong? Everyone else that I asked for help from also got 120..
Sorry, my bad Maria. I didn't multiply it right, obviously.
Haha it's okay but I reaaally don't know how the answer is 60 and it's really frustrating me =(
k=5/4
and when u integrate
u integrate from 4 to 8
cuz natural length is 6
10-6=4 and 14-6=8
Thanks Judy! But k really does equal 5/2. I even FnInt'd it. But you really helped, thanks!
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