Unformatted text preview: 7. A crate that weighs 20 N starts from rest and slides down a rough 50 m long ramp,
inclined at 25 degrees with the horizontal. During this slide 20 J of energy is lost due
to friction. a. (5 points) What is the kinetic friction force on the crate?
b. (5 points) What is the speed of the crate at the bottom of the ramp? 8. (10 points) An ideal spring is compressed 12 cm from the equilibrium length
resulting in 72 J of potential energy being stored in the spring. What compression
from the equilibrium length would be required to store 100 J of potential energy in the spring? X7” O~\l'1- 3 iO)OOO N/m
\OO 2 ~53<IOJOOQ§ X1 ...
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- Fall '08