When a Single Boxcar in the Freight Yard Hooks onto a Stationary

question 13

Multiple Choice

When a single boxcar in the freight yard hooks onto a stationary string of four boxcars, as in example 7.4, there is some kinetic energy lost. Which of the following could account for the missing energy?

• A) Sound energy in the loud CLANG when they hook together.
• B) Heat energy in the clamping mechanism between cars as it opens and then captures the fifth boxcar.
• C) Both A and B

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