Question

Stretching springs!

Answer 1

I'm not sure how to do the first one? I first got 0.44 and then got 0.044
which both seem like too small of numbers xP

Answer 2

@zepdrix ^-^

Answer 3

Pretty sure the second one is incorrect too.

Answer 4

oo. is the first one 1.67?

Answer 5

@DanJS

Answer 6

Force Spring = -k*x
Work = Force*distance

Answer 7

Isn't it
Force = k*x
not -k?

Answer 8

@ganeshie8

Answer 9

@tkhunny

Answer 10

hi

Answer 11

the work done can be thought of as the area under the curve, Work = Force*distance

the linear part is just a right triangle, so the area is just 1/2*base*height, or

W = 1/2 * x * F = 1/2 * x * kx
W = 1/2 * k * x^2

for the linear portion

Answer 12

---5 J of work stretched the spring 32 to 38cm = 0.06m

W = 1/2 * k * d^2

5 J = 1/2 * k * (0.06 m)^2

k = 166.7 [N/m]

Answer 13

sorry the above is
k=2777.78 N/m
There is the spring constant. Now calculate the Work for the next part 34 - 36 cm

d = 2cm = 0.02m
k = 2777.78 N/m

W = 0.5 * k * d^2 = 0.56 J

Answer 14

The last same thing i think.

W = 1/2 * k * d^2

45 [J] = 1/2 * 2777.78 [N/m] * d^2

d = 0.18 m

Answer 15

what you think

Answer 16

yeah it depends on the way you define direction, and if you are compressing or stretching the spring, whether the force is -k or +k,

Answer 17

here the force is in the + , and the spring force is in the - from stretching the spring