Monday

October 20, 2014

October 20, 2014

Posted by **leeece** on Sunday, October 16, 2011 at 4:58pm.

1) Plot the potential energy of the spring from = -5.00 cm to = 5.00 cm.

2) Determine the turning points of the block if its speed at x = 0 is 1.1 m/s

I am so stumped on this problem. Could someone please help?

Thank you!

- physics -
**Erica**, Monday, February 18, 2013 at 12:34amTo plot the potential energy, simply plug your givens into the equation U=(1/2)kx^2. You should get a parabola that goes to 0 in the center.

To determine the turning points of the block, use the law of conservation of energy. You know that Ui+Ki = Uf+Kf since there is no friction. At x=0, there will be no potential energy (Ui=0). A "turning point" is where the motion will stop and the block will move in the opposite direction. This means that Kf=0.

So, set Ki=Uf

(1/2)mv^2 = (1/2)kx^2

(1/2)(.9)(1.2)^2 = (1/2)(775)x^2

Solve for x=.0409 m

This will be the first turning point. The other turning point will be the opposite of this (remember the parabola) - so x=-.0409 m.

**Answer this Question**

**Related Questions**

physics - A block of mass = 0.85 kg is connected to a spring of force constant...

physics - a block of mass m=0.9 kg is connected to a spring of force constant k...

Physics - A 0.500 kg block is sitting on a horizontal, frictionless surface. The...

Physics - A 0.500 kg block is sitting on a horizontal, frictionless surface. The...

physics - In Figure (a), a block of mass m lies on a horizontal frictionless ...

Physics - Block A of mass 2.0 kg and Block B of 8.0 kg are connected by a spring...

physics - A spring (spring 1) with a spring constant of 520N/m is attached to a...

physics - A block of ice of mass 4.10 kg is placed against a horizontal spring ...

Physics, - A block of mass 0.25 kg is connected to a spring with spring ...

science, physics - A block of mass 0.25 kg is connected to a spring with spring ...