7. For 0

Elementary Algebra
17th Edition
ISBN:9780998625713
Author:Lynn Marecek, MaryAnne Anthony-Smith
Publisher:Lynn Marecek, MaryAnne Anthony-Smith
Chapter6: Polynomials
Section6.1: Add And Subtract Polynomials
Problem 6.5TI: Add: 12q2+9q2 .
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Question
7.
For 0 <t < 24 hours, the temperature inside a refrigerator in a kitchen is given by the function W that satisfies
3 cos t
dW
the differential equation
dt
W(t) is measured in degrees Celsius (°C), and t is measured in hours.
2W
At time t =
0 hours, the temperature inside the refrigerator is 3°C.
(a) Write an equation for the line tangent to the graph of y = W(t) at the point where t =
0. Use the equation
to approximate the temperature inside the refrigerator at t =
0.4 hour.
(b) Find y = W(t), the particular solution to the differential equation with initial condition W(0) = 3.
%3D
(c) The temperature in the kitchen remains constant at 20°C for 0 < t < 24. The cost of operating the
refrigerator accumulates at the rate of $0.001 per hour for each degree that the temperature in the kitchen
exceeds the temperature inside the refrigerator. Write, but do not evaluate, an expression involving an
integral that can be used to find the cost of operating the refrigerator for the 24-hour interval.
Transcribed Image Text:7. For 0 <t < 24 hours, the temperature inside a refrigerator in a kitchen is given by the function W that satisfies 3 cos t dW the differential equation dt W(t) is measured in degrees Celsius (°C), and t is measured in hours. 2W At time t = 0 hours, the temperature inside the refrigerator is 3°C. (a) Write an equation for the line tangent to the graph of y = W(t) at the point where t = 0. Use the equation to approximate the temperature inside the refrigerator at t = 0.4 hour. (b) Find y = W(t), the particular solution to the differential equation with initial condition W(0) = 3. %3D (c) The temperature in the kitchen remains constant at 20°C for 0 < t < 24. The cost of operating the refrigerator accumulates at the rate of $0.001 per hour for each degree that the temperature in the kitchen exceeds the temperature inside the refrigerator. Write, but do not evaluate, an expression involving an integral that can be used to find the cost of operating the refrigerator for the 24-hour interval.
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