Heat flux in a plate A square plate R = {( x , y ): 0 ≤ x ≤ 1, 0 ≤ y ≤ 1} has a temperature distribution T ( x , y ) = 100 – 50 x – 25 y . a. Sketch two level curves of the temperature in the plate. b. Find the gradient of the temperature ▿ T ( x, y ) . c. Assume that the flow of heat is given by the vector field F = –▿ T ( x , y ). Compute F . d. Find the outward heat flux across the boundary {( x , y ): x = 1, 0 ≤ y ≤ 1}. e. Find the outward heat flux across the boundary {( x , y ): 0 ≤ x ≤ 1, y = 1}.
Heat flux in a plate A square plate R = {( x , y ): 0 ≤ x ≤ 1, 0 ≤ y ≤ 1} has a temperature distribution T ( x , y ) = 100 – 50 x – 25 y . a. Sketch two level curves of the temperature in the plate. b. Find the gradient of the temperature ▿ T ( x, y ) . c. Assume that the flow of heat is given by the vector field F = –▿ T ( x , y ). Compute F . d. Find the outward heat flux across the boundary {( x , y ): x = 1, 0 ≤ y ≤ 1}. e. Find the outward heat flux across the boundary {( x , y ): 0 ≤ x ≤ 1, y = 1}.
Solution Summary: The author illustrates the two level curves of the temperature in the square plate.
Heat flux in a plate A square plate R = {(x, y): 0 ≤ x ≤ 1, 0 ≤ y ≤ 1} has a temperature distribution T(x, y) = 100 – 50x – 25y.
a. Sketch two level curves of the temperature in the plate.
b. Find the gradient of the temperature ▿ T(x, y).
c. Assume that the flow of heat is given by the vector field F = –▿ T(x, y). Compute F.
d. Find the outward heat flux across the boundary {(x, y): x= 1, 0 ≤ y ≤ 1}.
e. Find the outward heat flux across the boundary {(x, y): 0 ≤ x ≤ 1, y = 1}.
Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.
A driver is traveling along a straight road when a buffalo runs into the street. This driver has a reaction time of 0.75 seconds. When the driver sees the buffalo he is traveling at 44 ft/s, his car can decelerate at 2 ft/s^2 when the brakes are applied. What is the stopping distance between when the driver first saw the buffalo, to when the car stops.
Topic 2
Evaluate S
x
dx, using u-substitution. Then find the integral using
1-x2
trigonometric substitution. Discuss the results!
Topic 3
Explain what an elementary anti-derivative is. Then consider the following
ex
integrals: fed dx
x
1
Sdx
In x
Joseph Liouville proved that the first integral does not have an elementary anti-
derivative Use this fact to prove that the second integral does not have an
elementary anti-derivative. (hint: use an appropriate u-substitution!)
1. Given the vector field F(x, y, z) = -xi, verify the relation
1
V.F(0,0,0) = lim
0+ volume inside Se
ff F• Nds
SE
where SE is the surface enclosing a cube centred at the origin and having edges of length 2€. Then,
determine if the origin is sink or source.
Chapter 17 Solutions
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