Solve the problem.
-The radius of a car wheel is 13 inches. How many revolutions per minute is the wheel making when the car is travelling at $45 \mathrm { mph }$. Round your answer to the nearest revolution.
A) $582 \mathrm { rpm }$
B) $7 \mathrm { rpm }$
C) $1214 \mathrm { rpm }$
D) $5742 \mathrm { rpm }$

Question

Quizplus · Accepted Answer

First, convert the speed from mph to inches per minute: $45 \mathrm { mph } = 45 \times 5280 \times 12 \mathrm { inches/minute }$. Then, calculate the circumference of the wheel: $C = 2\pi r = 2\pi(13)$. The number of revolutions per minute is the total inches traveled per minute divided by the circumference of the wheel. Plugging in the numbers gives approximately $582 \mathrm { rpm }$.

Solve the Problem 45mph45 \mathrm { mph }45mph Round Your Answer to the Nearest Revolution

Solve the Problem $45 \mathrm { mph }$ Round Your Answer to the Nearest Revolution