Heat transfer from a body to its surroundings by radiation, based or he Stefan-Boltzmann law, is described by the differential equation du = -a(u' – T*) (1. dt where u(t) is the absolute temperature of the body at time t, T is th absolute temperature of the surroundings, and a is a constant depending on the physical parameters of the body. However, if u is nuch larger than T, then solutions of equation (1) are well pproximated by solutions of the simpler equation du = -qu". -au". (2 dt Suppose that a body with initial temperature 2450 K is surrounded medium with temperature 280 K and that a = 6 × 10-1²K-³/s. ) Determine the temperature of the body at any time by solving equation (2). u(t) K p) Use a graphing utility to plot the graph of u versus t. :) Find the time r at which u(7) = 560 –that is, twice the ambient temperature. Up to this time the error in using equation (2) to approximate the solutions of equation (1) is no more than 1%.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Heat transfer from a body to its surroundings by radiation, based on
the Stefan-Boltzmann law, is described by the differential equation
du
= -a(u' – T*)
(1)
dt
where u(t) is the absolute temperature of the body at time t, T is the
absolute temperature of the surroundings, and a is a constant
depending on the physical parameters of the body. However, if u is
much larger than T, then solutions of equation (1) are well
approximated by solutions of the simpler equation
du
= -qut,
dt
(2)
Suppose that a body with initial temperature 2450 K is surrounded by
a medium with temperature 280 K and that a = 6 × 10-1'K-3/s.
a) Determine the temperature of the body at any time by solving
equation (2).
u(t)
K
b) Use a graphing utility to plot the graph of u versus t.
c) Find the time 7 at which u(T) = 560 –that is, twice the ambient
temperature. Up to this time the error in using equation (2) to
approximate the solutions of equation (1) is no more than 1%.
T =
Transcribed Image Text:Heat transfer from a body to its surroundings by radiation, based on the Stefan-Boltzmann law, is described by the differential equation du = -a(u' – T*) (1) dt where u(t) is the absolute temperature of the body at time t, T is the absolute temperature of the surroundings, and a is a constant depending on the physical parameters of the body. However, if u is much larger than T, then solutions of equation (1) are well approximated by solutions of the simpler equation du = -qut, dt (2) Suppose that a body with initial temperature 2450 K is surrounded by a medium with temperature 280 K and that a = 6 × 10-1'K-3/s. a) Determine the temperature of the body at any time by solving equation (2). u(t) K b) Use a graphing utility to plot the graph of u versus t. c) Find the time 7 at which u(T) = 560 –that is, twice the ambient temperature. Up to this time the error in using equation (2) to approximate the solutions of equation (1) is no more than 1%. T =
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