Posted by **Jin** on Saturday, October 24, 2009 at 8:28pm.

In Figure (a), a block of mass m lies on a horizontal frictionless surface and is attached to one end of a horizontal spring (spring constant k) whose other end is fixed. The block is initially at rest at the position where the spring is unstretched (x = 0) when a constant horizontal force vector F in the positive direction of the x axis is applied to it. A plot of the resulting kinetic energy of the block versus its position x is shown in Figure (b). The scale of the figure's vertical axis is set by Ks = 2.4 J and the scale of the figure's horizontal axis is set by xmax = 2.8 m.

_

| Ks| / \

a) |xxxx[] b) |/ \x=2.8m

<----x=0---->

figure a) a box connected to the wall by a spring.

figure b) a graph of K over x where K is 0 at x=0 and at x = 2.8. Ks = 2.4 J

1) What is the magnitude of F?

2) What is k(spring coefficient)?

- physics -
**bobpursley**, Saturday, October 24, 2009 at 8:53pm
Is there a possiblity you can post the drawing on your website?

- physics -
**Jin**, Saturday, October 24, 2009 at 9:00pm
I figured it out. All you need to do is use Wnet = Wforce + Wspring = Kf - Ki twice. Once for the entire displacement Kf - Ki = 0 and once for half way where Kf - Ki = 2.4. Both times you will have a k(spring constant term) in the equation and if you solve for them and set equal you can solve for Force. Thanks anyway bobpursley.

- physics -
**Sopuruchi**, Tuesday, January 31, 2012 at 2:40pm
Solve this eqution in fall A body travels from rest with acceleration 8m/s2 find velocity when it has covered a distance of 100m.

## Answer This Question

## Related Questions

- PHYSICS - A block of mass m lies on a horizontal frictionless surface and is ...
- Physics - An ideal massless spring is fixed to the wall at one end. A block of ...
- physics - A physics student pulls a block of mass m = 23 kg up an incline at a ...
- physics - A solid block of mass m2 = 1.0 $kg$, at rest on a horizontal ...
- Physics - A block of mass M=6 kg and initial velocity v=0.8m/s slides on a ...
- AP PHYSICS MECH. - In Figure 9-62, block 2 (mass 1.3 kg) is at rest on a ...
- Physics - A 4.36 kg block free to move on a horizontal, frictionless surface is ...
- physics - A solid block of mass m2 = 8.3 kg, at rest on a horizontal ...
- physics - A 11.1-kg block rests on a horizontal table and is attached to one end...
- physics - The block in the figure below lies on a horizontal frictionless ...

More Related Questions