Mechanics: Work and Energy

Work and Energy: Audio Guided Solution

Extra Problem 10:

A toe rope is being used to toe 18 skiiers up a ski hill at a constant speed. The average mass of the skiiers is 49.8 kg. The hill is inclined at 11.4 degrees. The power output of the motor is 3.44 kW. With what maximum speed (in m/s) can the skiier be toed? Assume that there is negligible friction.

 

 

Audio Guided Solution

Read About It!

Get more information on the topic of Work and Energy at The Physics Classroom Tutorial.

• Work
• Sample Work Calculations
• Power
• Resolving the Weight Vector on an Inclined Plane
• Potential Energy
• Kinetic Energy
• Mechanical Energy
• Situations Involving External Forces
• Situations Involving Energy Conservation

Return to Original Problem Set

Return to Index of Extra Problems

Return to Overview




 

Habits of an Effective Problem Solver

An effective problem solver by habit approaches a physics problem in a manner that reflects a collection of disciplined habits. An effective problem-solver...

• ...reads the problem carefully and develops a mental picture of the physical situation. If needed, they sketch a simple diagram of the physical situation to help visualize it.
• ...identifies the known and unknown quantities in an organized manner, often times recording them on the diagram iteself. They equate given values to the symbols used to represent the corresponding quantity (e.g., v_o = 0 m/s; a = 4.2 m/s/s; v_f = 22.9 m/s; d = ???).
• ...plots a strategy for solving for the unknown quantity; the strategy will typically center around the use of physics equations be heavily dependent upon an understaning of physics principles.
• ...identifies the appropriate formula(s) to use, often times writing them down. Where needed, they perform the needed conversion of quantities into the proper unit.
• ...performs substitutions and algebraic manipulations in order to solve for the unknown quantity.