wat is meant by saying if spring is cutted in pieces then wat will be the relation before cutting spring

- anonymous

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- anonymous

assume the dat spring ius cutted in equal halves

- anonymous

den wat we can predict abu dat halves?

- wasiqss

sirf length change hogi cutting mai, spring constant remains same

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- anonymous

ok..

- anonymous

No wasqiss is wrong. If you cut a spring in two then spring constant doubles.

- anonymous

|dw:1328373587473:dw|

- anonymous

mera ans ni a rha isse
ques. a spring constant of two springs are K1 and K2 such that one peice is double of the other. then the long peice will have a force constant of??

- wasiqss

Since f=kx, then k=f/x.
Now if you apply the same force to the half-length spring it only moves half as far. So if x is halved above, then k will double.
Basically there are now half as many coils to take up the force via displacement.

- anonymous

well not getting ans dats y i post ques ans is 3/2K

- anonymous

(3/2)k

- anonymous

If you cut a spring of constant k into two springs of constants k1 and k2 and lengths l1 and l2 then 1/k=1/k1+ 1/k2. And k1/k2=l2/l1.solve these two equations to get the answer.

- wasiqss

Let us look at a 10 coil spring as an example. Suppose we apply a force to the spring that compresses it 1 inch meaning that each coil is compressed 1/10 of an inch. If we then cut the spring in half, leaving 5 coils, and then compress it 1 inch, then each coil is compressed 2/10 or 1/5 of an inch. The general spring equation is
F = -kx
where F is the applied force, k is the spring constant and x is the distance the spring is compressed. So the force needed to compress a single coil by 2/10 of an inch is twice as large as to compress it 1/10 of an inch. Therefore the spring constant (k) of the 5-coil spring must be twice that of the 10-coil spring, because each individual coil of the 5-coil spring is compressed twice as far as each individual coil of the 10-coil spring for the same overall distance.
So in general the spring constant of a spring is inversely proportional to the number of coils in the spring.

- anonymous

guys ans is (3/2)k
and shankvee ur formula is rit but can u tell me is K dont changes if l increases plz ??

- anonymous

K does change if you cut it into two.I don't think i got your question properly....

- anonymous

ques. a spring constant of two springs are K1 and K2 such that one peice is double of the other. then the long peice will have a force constant of??

- anonymous

Since one piece is double the other k1/k2=1/2. 1/k=1/k1 +1/k2.
So, k1=k2/2, 3/k2=1/k. k2=3k and k1=3/2 k. The longer peice is k1=3/2k

- wasiqss

yaar heena ques toh sahi likha karo

- anonymous

sahi toh likha h..

- wasiqss

shuru mai galat tha

- anonymous

kaha?? vo to mera doubt tha if u can see

- wasiqss

ahhh ok dint read that fully

- anonymous

and shankvee how u get tat springs are arranged in parallel or series??

- anonymous

toh kisk galti ti... bolo bolo k meri ti

- anonymous

If two springs have same extension then they are in parallel.

- wasiqss

ok baba

- anonymous

yea dat i know but couldnt get hint in this ques where dey are talking abu extension??

- anonymous

Like |dw:1328374653040:dw| Here if block moves by x then both springs are definitely stretched by x.

- anonymous

|dw:1328374593437:dw|

- anonymous

jst simply..............

- anonymous

k..

- anonymous

Now in series like |dw:1328374762687:dw| The two are strectched by different amounts

- anonymous

This question will actually be series like |dw:1328374871961:dw| In the bottom the resultant spring constant will become equal to the original spring constant (Same as the b) part in the previous question).

- anonymous

yea i get it thnQ csir nw nxt one plz
http://openstudy.com/study#/updates/4f2d64fbe4b0571e9cba6a8b

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