0:00
Let's do part a.
00:02
Well, a sipping force, f is given by k times x.
00:09
K is the supreme constant and x is displacement.
00:14
Well, k in this case is 1 .2 multiply by 10 to the power 4 and displacement is 0 .06 .0 .06.
00:29
And therefore, f is equal to 720 newton.
00:38
So the force to extend the sipping is 720 newtons.
00:43
Now let's do part b.
00:46
Well, the change in elastic potential energy, the change in elastic potential energy, is equal to 1 divided by 2 times the siperin constant times delta x square and further this can be written is 1 divided by 2 into k into a final position minus initial position all right now let's plug in the values so change in elastic potential energy is equal to 1 divided by 2 multiply by 1 .2, multiply by 10 to the power 4 into, well, xf square is 0 .0036 minus, well, initial position is zero.
01:54
And therefore, change in elastic potential energy, delta us, which is change in elastic potential energy, is 21 .6 joules...