Electrical Resistance The resistance R of a certain type of resistor is R = 0.001 T 4 − 4 T + 100 where R is measured in ohms and the temperature T is measured in degrees Celsius. (a) Use a computer algebra system to find d R / d T and the critical number of the function. Determine the minimum resistance for this type of resistor. (b) Use a graphing utility to graph the function R and use the graph to approximate the minimum resistance for this type of resistor.
Electrical Resistance The resistance R of a certain type of resistor is R = 0.001 T 4 − 4 T + 100 where R is measured in ohms and the temperature T is measured in degrees Celsius. (a) Use a computer algebra system to find d R / d T and the critical number of the function. Determine the minimum resistance for this type of resistor. (b) Use a graphing utility to graph the function R and use the graph to approximate the minimum resistance for this type of resistor.
Solution Summary: The author explains the Maple command to obtain the derivative of the function.
Electrical Resistance The resistance R of a certain type of resistor is
R
=
0.001
T
4
−
4
T
+
100
where R is measured in ohms and the temperature T is measured in degrees Celsius.
(a) Use a computer algebra system to find
d
R
/
d
T
and the critical number of the function. Determine the minimum resistance for this type of resistor.
(b) Use a graphing utility to graph the function R and use the graph to approximate the minimum resistance for this type of resistor.
Consider the following system of equations, Ax=b :
x+2y+3z - w = 2
2x4z2w = 3
-x+6y+17z7w = 0
-9x-2y+13z7w = -14
a. Find the solution to the system. Write it as a parametric equation. You can use a
computer to do the row reduction.
b. What is a geometric description of the solution? Explain how you know.
c. Write the solution in vector form?
d. What is the solution to the homogeneous system, Ax=0?
2. Find a matrix A with the following qualities
a. A is 3 x 3.
b. The matrix A is not lower triangular and is not upper triangular.
c. At least one value in each row is not a 1, 2,-1, -2, or 0
d. A is invertible.
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