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March 5, 2015

March 5, 2015

Posted by **lost** on Tuesday, May 1, 2012 at 8:42pm.

a. at what rate does mechanical energy turn into thermal energy. I found this:

28.2528 kW

b.While the elevator is moving downward at 1.6 m/s, the braking system fails and the elevator is in free-fall for a distance of 5.3 m before hitting the top of a large safety spring with force constant of 1.50 104 N/m. After the elevator hits the top of the spring, find the distance d that the spring is compressed before the elevator is brought to rest.

- physics -
**bobpursley**, Tuesday, May 1, 2012 at 9:02pmrate of energy: force*distance/time=mg*velocity

KE of fall+ addedPE= PE spring

1/2 m*1.6^2+mg*5.3+ mg*x= 1/2 k x^2

solve for x

Looks like a quadratic equation.

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