- #1

TyFelmingham

- 9

- 0

found to be:

F = – k1x – k2 x^2

where k1 = 52.8 N.m-1; k2 = 38.4 N.m-2.

a) Compute the work required to stretch the spring from x = 0.500 m to x = 1.00 m.

b) With one end of the spring fixed, a particle of mass 2.17 kg is attached to the other end of the

spring when it is extended by an amount x = 1.00 m. If the particle is then released from rest,

compute its speed at the instant the spring has returned to the configuration in which the extension

is x = 0.500 m.

c) Is the force exerted by the spring conservative or nonconservative? Explain your answer.

Ok, for a)

sub in the numbers for x = 1m and you get -91.2 N

sub in the numbers for x= .5m and you get - 36 N

So force is 127.2 N when the spring is stretched from .5 to 1m?

As W = F*x, do i just plug in x=.5m and F = 127.2 N?

Cheers