Mechanics: Work and Energy

Work and Energy: Audio Guided Solution

Problem Set WE5, Question 1:

An 1159-kg car accelerates uniformly from rest to a speed of 11.4 m/s in 3.29 seconds. Determine the average power (in hp) delivered by the engine during these 3.29 seconds. (1 hp = 746 W)
 

 

 

Audio Guided Solution

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., v_o = 0 m/s; a = 4.2 m/s/s; v_f = 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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Read About It!

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

• Work
• Sample Work Calculations
• Power

 

 

Watch It!

Try our YouTube videos on the topic of ...

• Physics of Work
   
• Work Calculations
   
• Power