Magic triples Let x , y , and z be nonnegative numbers with x + y + z = 200. a. Find the values of x, y , and z that minimize x 2 + y 2 + z 2 . b. Find the values of x , y , and z that minimize x 2 + y 2 + z 2 . c. Find the values of x , y , and z that maximize xyz. d. Find the values of x , y , and z that maximize x 2 y 2 z 2 .
Magic triples Let x , y , and z be nonnegative numbers with x + y + z = 200. a. Find the values of x, y , and z that minimize x 2 + y 2 + z 2 . b. Find the values of x , y , and z that minimize x 2 + y 2 + z 2 . c. Find the values of x , y , and z that maximize xyz. d. Find the values of x , y , and z that maximize x 2 y 2 z 2 .
Solution Summary: The author explains how to find the values of x, y and z that minimize the value of x2+y2.
3. A spring is stretched 6 in. by a mass that weighs 8 lb. The mass is attached to a dashpot
mechanism that has a damping constant of 0.25 lb-sec./ft. and is acted on by an external
force of 4 cos 2t lb.
a. Set-up the differential equation and initial value problem for the system.
b. Write the function in phase-amplitude form.
C.
Determine the transient solution to the system. Show your work.
d. Determine the steady state of this system. Show your work.
e.
Is the system underdamped, overdamped or critically damped? Explain what this
means for the system.
4. Suppose that you have a circuit with a resistance of 20, inductance of 14 H and a
capacitance of 11 F. An EMF with equation of E(t) = 6 cos 4t supplies a continuous charge
60
to the circuit. Suppose that the q(0)= 8 V and the q'(0)=7. Use this information to answer the
following questions
a. Find the function that models the charge of this circuit.
b. Is the circuit underdamped, overdamped or critically damped?
1. Solve the initial value problem:
y" -11y' + 30y = x³e6x
y(0) 11, y'(0) = 36
=
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