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where to start from???please help
- Thread starter iamageek
- Start date
Hello, iamageek!
\(\displaystyle \text{Since }\,C \:=\:2\pi r\text{, we have: }\:2\pi(5) \:=\:10\pi \text{ ft/rev}\)
\(\displaystyle \text{The tire is moving at }145\text{ ft/sec.}\)
\(\displaystyle \text{Hence: }\:\frac{145\text{ ft/sec}}{10\pi\text{ ft/rev}} \;=\;\frac{29}{5\pi}\text{ rev/sec}\)
\(\displaystyle \text{Therefore: }\:60 \times \frac{29}{5\pi}\text{ rev/sec} \;=\;\frac{860}{\pi}\text{ rev/min} \;\approx\; 277\text{ rpm.}\)
A tire of a car has a radius of 5 feet.
What is the rpm when the car is traveling at a speed of 145 feet per sec?
i tried by finding the Circumference, then multiplying it with 145. . . . . no
\(\displaystyle \text{Since }\,C \:=\:2\pi r\text{, we have: }\:2\pi(5) \:=\:10\pi \text{ ft/rev}\)
\(\displaystyle \text{The tire is moving at }145\text{ ft/sec.}\)
\(\displaystyle \text{Hence: }\:\frac{145\text{ ft/sec}}{10\pi\text{ ft/rev}} \;=\;\frac{29}{5\pi}\text{ rev/sec}\)
\(\displaystyle \text{Therefore: }\:60 \times \frac{29}{5\pi}\text{ rev/sec} \;=\;\frac{860}{\pi}\text{ rev/min} \;\approx\; 277\text{ rpm.}\)