1. Observe the warped lines on asphalt pavement in front of a stoplight (Figure).

(a) What type of stress causes such curved lines?
(b) Why are the warped lines, as seen in the photograph, more noticeable at stop signs and stoplights than on other sections of road?
2. Raul weighs 235 lb and is able to float in seawater but not in fresh water. Find his volume assuming that his density is the average density of seawater and freshwater.

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