40 20 12 24 Time (hr) Flow rate of water (m³hr)
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
A reservoir with a capacity of 2500 m3 is filled
with a single inflow pipe. The reservoir is empty when the inflow pipe is opened at t = 0. Letting Q(t) be the amount of water in the reservoir at time t, the flow rate of water into the reservoir (in m3/hr) oscillates on a 24-hr cycle (see figure) and is given by
Q'(t) = 20(1 + cos∏t/12)
a. How much water flows into the reservoir in the first 2 hr?
b. Find the function that gives the amount of water in the
reservoir over the interval [0, t], where t ≥ 0.
c. When is the reservoir full?
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