Tuesday

March 31, 2015

March 31, 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.

**Answer this Question**

**Related Questions**

physics - The cable of a 1800-kg elevator has broken, and the elevator is ...

physics - The cable of a 1800-kg elevator has broken, and the elevator is moving...

physics - An elevator is being lifted up an elevator shaft at a constant speed ...

physics - A 800·kg elevator is attached to a cable whose tension is 7800·N. ...

Physics - In a "worst-case" design scenario, a 2000-{\rm kg} elevator with ...

Physics - An elevator is initially moving upward at a speed of 11.04 m/s. The ...

Physics - An elevator and its load have a combined mass of 1600 kg. Find the ...

Physics - An elevator has a combined mass of 1700kg. Find the tension of the ...

physics - an elevator and its load have a total mass of 1000kg. find the tension...

physics - An elevator is initially moving upward at a speed of 12.84 m/s. The ...