August 2016

Algebra: Remainder Theorem

Submitted by soneng on August 1, 2016 - 12:40pm

Hello. I'm having a hard time with this problem. Please help. Thank you.

When a certain polynomial p(x) is divided by (x-1), remainder is 12. When the same polynomial is divided by (x-4), the remainder is 3. Find the remainder when the polynomial is divided by (x-1)(x-4).

Differential Equations

Submitted by agentcollins on August 2, 2016 - 4:34pm

The topic is chemical reaction rate.

Two substances A and B are combined to form a product C. The formation of product is proportional to the time the reactants are combined. The final product is composed of two parts of B for every part of A. If initially A is 30 kg and B is 20 kg, and 5 kg of the product is formed after 30 mins., find the function of product formed at any given time.

Differential Equations

Submitted by agentcollins on August 2, 2016 - 4:37pm

The topic is chemical reaction rate.

Two substances A and B are combined to form a product C. The formation of product is proportional to the time the reactants are combined. The final product is composed of three parts of A for every part of B. If initially A is 50 lbs and B is 60 lbs, and 10 lbs of the product is formed after 45 mins., find the time it takes for the reaction to form 25 lbs.

The answer is 135 minutes. Show complete solution please. Thank you.

John Rey Arellano Necor's picture

math

Submitted by John Rey Arella... on August 3, 2016 - 8:11pm

Guys can you help me to solve and graph this one . thanks

1. y^2=(x^2=1)(x-3)/X^3
2. x^2y-xy-x^2+10x-12y-21=0
3. y^2=x^3-9x^2+20x

Differential Equations - Elementary Application

Submitted by agentcollins on August 4, 2016 - 1:48am

An RL circuit has the following values: R=1 kilo ohms, and C= 1microF. If v(0)=10v, find v(1 ms), i(1 ms) and w(1 ms).

Answers respectively: 3.68 V, 3.68 mA and 6.8 microJ.

Please show the complete solution. It'll be a great help. Thank you.

Cristine Ferranco Bunales's picture

[Locked] engineering mechanics

Submitted by Cristine Ferran... on August 4, 2016 - 2:05pm

PLEASE PO.. PATURO KUNG PANO KUMUHA NG REACTION AT PAANO ANG PAG MOMENT

This post is locked by moderator. Note: be more specific; provide more information.

Differential Equation $2y \, dx+x(x^2 \ln y -1) \, dy = 0$

Submitted by qwerty on August 6, 2016 - 9:58pm

Please help me solve this Differential Equation

2ydx+x(x2lny -1)dy=0

Differential Equation xdy-[y+xy^3(1+lnx)]dx=0

Submitted by qwerty on August 7, 2016 - 11:23am

Please hep me to obtain the general solution

xdy-[y+xy3(1+lnx)]dx=0

Sydney Sales's picture

engineering economy

Submitted by Sydney Sales on August 7, 2016 - 2:07pm

A sum of Rs. 725 is lent in the beginning of a year at a certain rate of interest. After 8 months, a sum of Rs. 362.50 more is lent but at the rate twice the former. At the end of the year, Rs. 33.50 is earned as interest from both the loans. What was the interest earned in the principal of P725?
What is the interest earned in the principal of P362.50?

Differential Equation

Submitted by qwerty on August 7, 2016 - 3:07pm

dx-(1+2xtany)dy=0

Please help me to solve that

Sydney Sales's picture

linear DE

Submitted by Sydney Sales on August 8, 2016 - 1:55pm

tdx/dx = 6t(e^ 2t) +x(2t-1)

Differential Calculus: center, vertices, foci of the ellipse: 16x² + 25y² - 160x - 200y + 400 = 0

Submitted by darbz11 on August 8, 2016 - 9:42pm

Please Help...

Find the center, vertices, foci of the ellipse given the equation 16x² +25y² -160x - 200y + 400 = 0.

Please help...

Colene Gammad's picture

Engineering Economics: How much is left in the account one year after the purchase?

Submitted by Colene Gammad on August 10, 2016 - 12:00pm

You deposit \$1,000 into a 9% account today. At the end of two years, you will deposit another \$3,000. In five years, you plan a \$4,000 purchase. How much is left in the account one year after the purchase?

Mech

Submitted by benty on August 14, 2016 - 2:39pm

Find each member and reactions. (by joint method)
1.jpg

Mech2

Submitted by benty on August 14, 2016 - 2:43pm

Find each member. (method of sections)
14012863_1423460777668646_1897516565_o.jpg

Problem 423 - Howe Roof Truss by Method of Sections

Problem 423
Use the method of sections to determine the force acting in members DF, EF, and EG of the Howe truss described in Problem 409.
 

423-howe-roof-truss-section-mm.gif

 

Problem 424 - Method of Joints Checked by Method of Sections

Problem 424
For the truss shown in Fig. P-424, determine the force in BF by the method of joints and then check this result using the method of sections. Hint: To apply the method of sections, first obtain the value of BE by inspection.
 

424-triangular-truss.gif

 

Problem 425 - Fink Truss by Method of Sections

Problem 425
In the Fink truss shown in Fig. P-425, the web members BC and EF are perpendicular to the inclined members at their midpoints. Use the method of sections to determine the force in members DF, DE, and CE.
 

425-fink-truss.gif

 

Ode real life problems and solution

Submitted by Prince Fausto on August 19, 2016 - 9:55pm

Can someone give me a link or teach me some ODE (ordinary differential equations) based on real life situations? Thanks!

Differential Equations - Elementary Application - Vertical Motion

Submitted by agentcollins on August 21, 2016 - 10:16pm

Mechanics Problem. I need it tomorr before 7 am. Thank you.

A ball is thrown upward with an initial velocity of 49 m/s. Find the velocity after 3 seconds. Find its maximum height. Compute the time it takes for the ball to return to its original point. Use g= 9.81 m/s^2 .

Differential Equations - Elementary Application

Submitted by agentcollins on August 21, 2016 - 10:17pm

Electric Circuits

Please solve completely. Thank you.

An RL circuit has the following values: R=550 ohms, L=4 henrys and Esub0=110 volts. If i(0)= 0 in the circuit, when does the current reach 90% of its limiting value?

Raniedel Inocencio's picture

Engineering Economy

Submitted by Raniedel Inocencio on August 23, 2016 - 11:12pm

Juan plans to raise a new building of 1 million. He raise the building by issuing 10%, 20 yr bond that would pay one hundred fifty thousand interest per year an repay the amount of maturity he can least it for Php 140,000 per year. First payment being due one year from now. The building has an expected life of 20 yrs. ignoring effects on income tax, what is the difference between buying the building and leasing it?

Tonette Villanueva's picture

Need help po

Submitted by Tonette Villanueva on August 25, 2016 - 10:38am

A constant horizontal force of 10 lb rests on a body of smooth horizontal plane. The body starts from rest and is observed to move 250 ft in 5s.
a). What is the mass of the body?
b). If the force ceases to act at the end of 5s, how far will the body move in the next 5s?

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