Physics 163

Unit 5: Work, Energy and Power

Problem Set A

Problem 8:

During peak shopping season at Northbrook Court, an escalator elevates 1396 passengers a vertical distance of 8.28 meters over the course of 27.9 minutes. If the average mass of the passengers are 53.9 kg, determine the power (in Watts) delivered by the escalator to the people.

• Read the problem carefully and diagram the physical situation
• Identify known and unknown information in an organized manner
• Take the time to plot out a strategy prior to beginning the solution
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

Work, energy and power concepts can be reviewed on the Set A Overview page.

Further information about the concept of and equation for power is available online at The Physics Classroom.

Further information about the mass-weight relationship is available online at The Physics Classroom.

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