Mechanics: Work, Energy and Power
Work, Energy and Power: Audio Guided Solution
Justin Thyme is traveling down Lake Avenue at 32.8 m/s in his 1510-kg 1992 Camaro. He spots a police car with a radar gun and quickly slows down to a legal speed of 20.1 m/s.
a. Determine the initial kinetic energy of the Camaro.
b. Determine the kinetic energy of the Camaro after slowing down.
c. Determine the amount of work done on the Camaro during the deceleration.
Audio Guided Solution
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b. 3.05 x 105 J
c. -5.07 x 105 J
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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