Kathy P. answered • 01/05/21

Mechanical Engineer with 10+ years of teaching and tutoring experience

Given: r' = 0.2 cm/sec

Find: A' in terms of C

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SOLUTION:

A = pi*r^2

dA/dt = pi*2r*r'

dA/dt = [2pi*r]*(r')

dA/dt = [ C ]*(0.2)

A' = C*(0.2) cm^2/sec