Problem 16. At a certain height, a tree trunk has a circular cross section. The radius R(t) of that cross section grows at a rate modeled by the function dR 1 (3 + sin(t²)) centimeters per year de 16 for 0sts 3, where time t is measured in years. At time t = 0, the radius is 6 centimeters. The area of the cross section at time t is denoted by A(t). (a) Write an expression, involving an integral, for the radius R(t) for 0 sI 3. Use your expression to find R(3). (b) Find the rate at which the cross-sectional area A(t) is increasing at time t = 3 years. Indicate units of measure. (c) Evaluate A'(1) dt. Using appropriate units, interpret the meaning of that integral in terms of cross- sectional area.

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Problem 16

Problem 16.
At a certain height, a tree trunk has a circular cross section. The radius R(t) of that cross section grows at
a rate modeled by the function
dR
(3 + sin(t² )) centimeters per year
16
dt
for 0sts 3, where time t is measured in years. At time 1 = 0, the radius is 6 centimeters. The area of
the cross section at time t is denoted by A(t).
(a) Write an expression, involving an integral, for the radius R(t) for 0 <iS 3. Use your expression to
find R(3).
(b) Find the rate at which the cross-sectional area A(t) is increasing at time t = 3 years. Indicate units
of measure.
(c) Evaluate A'(1) dt. Using appropriate units, interpret the meaning of that integral in terms of cross-
sectional area.
Transcribed Image Text:Problem 16. At a certain height, a tree trunk has a circular cross section. The radius R(t) of that cross section grows at a rate modeled by the function dR (3 + sin(t² )) centimeters per year 16 dt for 0sts 3, where time t is measured in years. At time 1 = 0, the radius is 6 centimeters. The area of the cross section at time t is denoted by A(t). (a) Write an expression, involving an integral, for the radius R(t) for 0 <iS 3. Use your expression to find R(3). (b) Find the rate at which the cross-sectional area A(t) is increasing at time t = 3 years. Indicate units of measure. (c) Evaluate A'(1) dt. Using appropriate units, interpret the meaning of that integral in terms of cross- sectional area.
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