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Q. A 1200 kg car carrying four 84 kg people travels over a rough "washboard" dirt road with corrugations 4.0 m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude when its speed is 19 km/h. The car now stops, and the four people get out. By how much does the car body rise on its suspension owing to this decrease in weight?

Q. The volume of a gas is changed along the curved line between A and B in the drawing below. Do not assume that the curved line is an isotherm or that the gas is ideal. (a) Find the magnitude of the work for the process, and (b) determine whether the work is positive.

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