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Mechanics: Work and Energy

Work and Energy: Audio Guided Solution

Problem Set WE5, Question 5:

During peak shopping season at Northbrook Court, an escalator elevates 1148 passengers a vertical distance of 8.28 meters over the course of 22.9 minutes. If the average mass of the passengers are 51.4 kg, determine the power (in Watts) delivered by the escalator to the people.

 




 

Audio Guided Solution

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Habits of an Effective Problem Solver

  • Read the problem carefully and develop a mental picture of the physical situation. If necessary, sketch a simple diagram of the physical situation to help you visualize it.
  • Identify the known and unknown quantities in an organized manner. Equate given values to the symbols used to represent the corresponding quantity - e.g., vo = 0 m/s; a = 4.2 m/s/s; vf = 22.9 m/s; d = ???.
  • Use physics formulas and conceptual reasoning to plot a strategy for solving for the unknown quantity.
  • Identify the appropriate formula(s) to use.
  • Perform substitutions and algebraic manipulations in order to solve for the unknown quantity



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