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Chapter 6: Q 91. (page 381)
Iffindrole="math" localid="1646573441822" .
The value ofis.
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The Montauk Point Lighthouse on Long Island has dual beams (two light sources opposite each other). Ships at sea observe a blinking light every five seconds. What rotation speed is required to do this?
Keeping Up with the Sun How fast would you have to travel on the surface of Earth at the equator to keep up with the Sun (that is, so that the Sun would appear to remain in
the same position in the sky)?
The Cable Cars of San Francisco At the Cable Car Museum you can see the four cable lines that are used to pull cable cars up and down the hills of San Francisco. Each cable travels at a speed of 9.55 miles per hour, caused by a rotating wheel whose diameter is 8.5 feet. How fast is the wheel rotating? Express your answer in revolutions per minute.
For a circle of radius r, a central angle of u degrees subtends an arc whose length s is . Discuss whether this is a true or false statement. Give reasons to defend your position.
Find the exact value of each expression. Do not use a calculator.
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