Tuesday

September 23, 2014

September 23, 2014

Posted by **Anonymous** on Sunday, December 5, 2010 at 3:37pm.

A 156 g hockey puck is attached to a rubber band and rotated with an angular speed of 12.8 rad/s on frictionless horizontal ice. It takes a force of 1.12 N to stretch the rubber band by 1 cm.

(a) If the original length L of the rubber band is 1 m, by how much (in m) will it be stretched by the rotation?

Delta L = .29568m

(b) How much energy do you need to start the stone from rest and rotate as in part (a) with an angular speed of 12.8 rad/s? Neglect the mass of the rubber band.

Etotal = J

HELP: Add up the kinetic energy and the elastic potential energy.

HELP: Ekin = 1/2*m*v2, with v = length*omega.

Remember again to use the stretched length:

Eelast = 1/2*k*(Delta L)2

**Answer this Question**

**Related Questions**

Chemistry - An alpha particle (mass 6.6 x 10^-24 grams) emitted by radium ...

physics - I really need help on D part of the following problem: A clever ...

physics - Vector V1 is 6.4 units long and points along the negative x axis. ...

Physics - h t t p : / / i m g 2 0 5 . i m a g e s h a c k . u s / i / c a p t u ...

Chemistry - Part A Calculate the standard enthalpy change for the reaction 2A+B...

Chemistry - Part A Calculate the standard enthalpy change for the reaction 2A+B...

Physics - I got part a and b, but not c. We are trying to find delta T in part c...

math - I ONLY NEED HELP WITH PART C I DID THE REST ON MY OWN plz help Shane drew...

Physics B - Part 1 Calculate the magnitude of the linear momentum for each of ...

Physics - An electron passes location <0.02m, 0.04m,−0.06m>, and 4...