anyone who knows physics of springs HELP

[pablo4429]

ok heres the link

http://www.grossmont.edu/irene.palacios/math%20180/exam5b_key_sp05.pdf

number 6

now my question is, if she wants the force needed from 0 to 9 inches past natural why did she use 3/4 on the second integral?????? because 9 inchs of 24 inches is .375 and 3/4 of 24 is 18 inches. did she mess up??/
thanks to all

[koleah]

ok heres the link

http://www.grossmont.edu/irene.palacios/math%20180/exam5b_key_sp05.pdf

number 6

now my question is, if she wants the force needed from 0 to 9 inches past natural why did she use 3/4 on the second integral?????? because 9 inchs of 24 inches is .375 and 3/4 of 24 is 18 inches. did she mess up??/
thanks to all

I think what it is is that the limits on the integral are in feet, hence her using a 2 in the first integral. If the spring goes from 0 to 9 inches in the second case, thats going from 0 to 3/4 feet.

This is why units should always be written in.

K

[pablo4429]

dammit now i feel like a dumbass but thanks i was thinking what decimal 9 inches was of 2 feet not one foot thanks

[MANN]

the 3/4ft is equal to 9in.

[MANN]

what class is this for? calc II maybe. If so it is the hardest one. calc III, and diff eq are much easier.

[pablo4429]

no this is 180 which i guess transferrs to calc 1

[bentothejam1n]

how do you like grossmont? my sister plans on going there then go to san diego state afterwards

[billybob_81067]

how do you like grossmont? my sister plans on going there then go to san diego state afterwards

MMMMMmmmmm... your sister...

Oh. Sorry.

[pablo4429]

well considering my first semester jsut got through it didnt go that bad and wasnt as hard as i expected just a lot of writing in english but what do you expect
ya i plan to do the same thing as your sister except maybe UCSD, or MIT haha i dont think so but that would be cool