September 2016

Sydney Sales's picture

Bernoulis

Submitted by Sydney Sales on September 19, 2016 - 2:58pm

y' + y = e×

Sydney Sales's picture

equations

Submitted by Sydney Sales on September 19, 2016 - 9:48pm

2xy' + y³ e^(-2x) = 2xy

Sydney Sales's picture

DE

Submitted by Sydney Sales on September 19, 2016 - 9:50pm

xy' = y + 2 √xy

Problem 428 - Howe Truss by Method of Sections

Problem 428
Use the method of sections to determine the force in members DF, FG, and GI of the triangular Howe truss shown in Fig. P-428.
 

428-howe-truss.gif

 

Junel Jhon D. Maglasang's picture

Shear and Moment in Frames

Submitted by Junel Jhon D. M... on September 21, 2016 - 12:28am

Ask ko lang po? Bat wala po kayong Shear and Moment in Frames?

Jay Mhinx Amoroto's picture

spherical triangle

Submitted by Jay Mhinx Amoroto on September 21, 2016 - 12:53pm

ambigous case of right triangle

02 - Time for the thermometer reading to drop to within half degree of the air temperature

Problem 02
A thermometer reading 75 degree Fahrenheit is taken out where the temperature is 20 degree Fahrenheit. The thermometer reading is 30 degree Fahrenheit 4 minutes later. Find the time (in minutes) taken for the reading to drop from 75 degree Fahrenheit to within half degree of the air temperature.
 

Physics

Submitted by Angela on September 24, 2016 - 10:57am

what is the magnitude of the resultant force of the two forces which are perpendicular to each other? the two forces are 20 units and 30 units respectively.

Differential Equations - Inverse D Operator

Submitted by agentcollins on September 25, 2016 - 8:52pm

(D^6 – 10D^5 + 20D^4 + 50D^3 – 121D^2 – 40D + 100)y = (64x^3)e
^(5x)
(Use Exponential Shift)

Differential Equations - Second Order Elementary Application

Submitted by agentcollins on September 25, 2016 - 8:56pm

Please help!!! :( I need it before midnight strikes. It's for my hhomework but I'm having a hard time. Thank you.

1. For a parallel RLC circuit, R = 1/3 ohms, C = 0.5 farads, and L = 2/13 henrys. If the
current source of the circuit produces i(t) = 20e^(–3t)sin 2t, find the voltage v at any time t
if v(0) = 2 and v’(0) = 1.5.

Related to velocity of sound

Submitted by soneng on September 28, 2016 - 9:55am

Please help. I can't find any solution of this problem on the internet. Thank you.

A glass falls from the window of a tall building . The sound of broken glass reaches the same level 3 s later. How high is the window? Assume velocity of sound to be 340m/s

03 - Excess of the Sum of Parts over the Difference of Parts of a Number

Problem
The excess of the sum of the half and the third parts over the difference of the fourth and the fifth parts of a number is 188. What is the value of the number?
 

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