Ashley Nord Online C... x 2 LON-CAPA Railroad Car x C Physics question I Chegg x

Question

Ashley Nord Online C... x 2 LON-CAPA Railroad Car x C Physics question I Chegg x a search physi dak,ed u/res/msu/ p/kap6/prob d165 probl ded%2fndsu%2f 8A2361183b98e5602ndsull% New Messages Courses Help Logout Makenzie Reutter v Student section: 01 Physics 211 College Physics I Spring 2016 Main Menu Contents Grades syllabus Feeds Timer Notes Evaluate Feedback Print a Info Course Contents Homework 09 Railroad Car Due this Friday, Mar 25 at 11:59 pm (CDT) Railroad Car A railroad car of mass 27000 kg is released from rest in a railway switc and rolls to the bottom of a slope Hi 11.5 m below its original height. At the low point, it collides with and sticks to another car of mass 22500 kg. The two cars roll together up another slope and climb up to a height Hf above the low point, where they come to a stop before rolling back. Ignore the effects of friction and calculate Hf in m After Before Submit Answer Tries 0/5 Send Feedback Post Discussion 5:04 PM P 3/24/2016

Explanation / Answer

Potential energy converted to kinetic energy as the first car rolls down the slope
= mgh = 27 * 10^3 * g * 11.5 J
Total mass after the collision
=27000 + 22500
= 49500 kg
No energy is lost, so
27 * 10^3 * g * 11.5 = 49.5 * 10^3 * g * Hf
Hf = 6.27m

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