Question

A spring requires a force of 25 N to produce an extension of 2 cm in it. What is the work done in further extending it by 3 cm.

Answer 1

its physics, i guess,.

Answer 2

its application of integration; work section

Answer 3

25.21 / 4

Answer 4

\[\lim\sum F(x)\triangle x\]

Answer 5

c'mon amistre.. he can use formulae as well. k=25/2 and the work done he needs is \[1\div2 \times K \times (a ^{2} - b ^{2})\] a is 5 & b is 2. or else, worry about the integration of k*x .

Answer 6

F(x) = 25x
\[\int_{2}^{3}(25x)dx\]
maybe?

Answer 7

they can yes; but wheres the fun in that :)

Answer 8

for the record it is a riemann sum as △x approaches zero. thats like the rectangles becoming small enuff that their edges approximate the curve really well. the curve here is a straight line.

Answer 9

25(3^2)/2-25(2^2)/2

Answer 10

the problem isnt fun anyway, its in other word the area under a line of given slope b/w tweo points. or the area of a trapezium. :)

Answer 11

25(9-5)/2 = 25(2) = 50 perhaps?

Answer 12

messed it up lol

Answer 13

25(9-4)/2 lol

25(5)/2 = 125/2 might be better

Answer 14

LOL! All the possible answers are between the numbers 1 and 3 and are in J, joules.

Answer 15

i dont know the conversions right off hand :)

Answer 16

50+12+.5 = 62.5 is the answer I get; but thats prolly in newton-centimeter

Answer 17

a Joule is: 1 newton is displaced through a distance of 1 metre

Answer 18

.03^2 = .0009; ...

25(.0005)/2 = .00625

http://www.wolframalpha.com/input/?i=int%2825x%29dx+from+.02+to+.03

Answer 19

CAN YOU POST YOUR OPTIONS?

Answer 20

http://www.onlineconversion.com/force.htm

Answer 21

IM GONA BREAK OFF THE CAPS KEY LOL

Answer 22

Every time I post my options, my questions get deleted

Answer 23

.625 still aint between 1 and 3

Answer 24

exactly.

Answer 25

if you get it wrong, will it tell you the right answer?

Answer 26

No :/

Answer 27

These are my options
1.3125J
1.876J
2.7121
2.85J

Answer 28

close your eyes, use the force, scream at the top of your lungs while clicking your best guess ....

Answer 29

Dont delete my post now :P

Answer 30

lmao. thats not going to help me much lol. The force isnt always the answer

Answer 31

im thinking i missed a part; something to do with x-someting

Answer 32

Oh the horror. Where's einstein when you need him?! Oh wait its amistre :)

Answer 33

25x(.02+x) maybe? gotta re read up some stuff

Answer 34

ohh.. okay.. Dont take too long :)

Answer 35

25 = 2x

F(x) = 25x/2 might be my undoing :)

Answer 36

to get it into newtons tho lets adjust it as this

25x^2
------ [.02,.03]
.04

25(.03^2)/.04 - 25(.02^2)/.04 = .3125 .... doh!!

re reading ...

Answer 37

read thru the problem and make sure you havent left out anything or typoed it please

Answer 38

the best i can come up with the given information is .3125

Answer 39

the measurements in the stated problem are simply to small to come up with anything substantive to me

Answer 40

Ohhh I see what you're saying. I guess I'll just go with that answer.

Answer 41

thanks :)

Answer 42

im gonna see if i can interpret this; "What is the work done in further extending it by 3 cm." to mean the over all work done is .5625 J

so it cant go higher than that ... srry

Answer 43

Curiousmath, I posted on this in the physics forum, let me know if you still have questions :)

Answer 44

i still have questions :)

Answer 45

I posted it in the physics section too, but that section isnt as popular as this one :)

Answer 46

what's up amistre?

Answer 47

i just looked at your post over there; and its the same information i keep coming up with; so im gonna assume the question is just bad :)

Answer 48

I don't think the answers given are correct, if that's what you are referring to. :)

Answer 49

yep ;)