Unit 5: Work, Energy and Power
Problem Set C
A 843-kg roller coaster car is lifted to a height of 57.1 meters above the ground where it begins its descent from an initial rest position. A total of -14061 Joules of work are done on the car by air resistance as it descends the first hill and rises to the top of the first loop - a height of 16.2 m. What is its speed (in m/s) at the top of this loop?
0.5 m vi2 + m g h i + F d cos = 0.5 m vf2 + m g h f
General information about work and energy problems is described on the Set C Overview page.
A detailed discussion of how to analyze physical situations using work-energy bar charts is provided online at The Physics Classroom.
A detailed description of the work-energy relationships for situation in which external forces are doing work is provided online at The Physics Classroom.
Audio Help for Problem: 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9 || 10 || 11 || 12 || 13 || 14
Retrieve info about: Audio Help || Technical Requirements || Usage Policy || CD-ROM
Return to: Physics 163 Problem Set Page || Physics 163 Home Page