August 2016

Differential Equations (PLEASE HELP PO)

Submitted by Zirrein on August 27, 2016 - 6:54pm

Find the differential equation of all circles with fixed radius and the centers are on the x-axis.
Please po :'(

Problem 426 - Fink Truss by Method of Sections

Problem 426
Using the method of sections, compute the force in bars FH, GH, and EK.
 

426-fink-truss-given.gif

 
 

Infinitesimal's picture

Exponential Function: $4^x + 6^x = 9^x$

Submitted by Infinitesimal on August 30, 2016 - 11:29am

Let $x$ be a real number that satisfy the equation

$4^x + 6^x = 9^x$

What is the value of $\left(\dfrac{2}{3}\right)^x$ ?

Differential Equations - Elementary Application

Submitted by agentcollins on August 31, 2016 - 1:09pm

Orthogonal Trajectories
y^3 - 3 = ln |Cx|

Please check if the answer I solved is correct.
My answer: y(3x^2 + c)=2

Differential Equations - Elementary Application

Submitted by agentcollins on August 31, 2016 - 11:01pm

A parachutist is falling with speed 176 ft/s when his parachute opens. If the air resistance is Wv2/225 lb where W is the total weight of the man and the parachute and v is in ft/s, find his speed as a function of time after the parachute opens.

If I use the suvat equations, the given resistance is the value of my what? Or I can't use the suvat equations at all?

If I use Fresultant=Fapplied-Fresistance. I can substitute the given resistance, but what would be the value or formula for getting my Fresulant and Fapplied?

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