Problem

Find how fast the circumference of a circl is growing, if its radius $r$ grows according to the following equation: \[ \frac{d r}{d t}=7 \frac{\mathrm{cm}}{\mathrm{s}} \] Show your work here

Solution

Step 1 :Given the rate at which the radius is growing: \(\frac{dr}{dt} = 7 \frac{\text{cm}}{\text{s}}\)

Step 2 :Find the rate at which the circumference is growing: \(\frac{dC}{dt} = 2 * \pi * \frac{dr}{dt}\)

Step 3 :Plug in the given value: \(\frac{dC}{dt} = 2 * \pi * 7 \frac{\text{cm}}{\text{s}}\)

Step 4 :Calculate the value of \(\frac{dC}{dt}\): \(\frac{dC}{dt} \approx 43.98 \frac{\text{cm}}{\text{s}}\)

Step 5 :\(\boxed{\text{Final Answer: The circumference of the circle is growing at a rate of approximately 43.98 cm/s}}\)

From Solvely APP
Source: https://solvelyapp.com/problems/7382/

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