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April 21, 2014

April 21, 2014

**Recent Homework Questions About Engineering**

Post a New Question | Current Questions

**Science**

1. Question : A decrease in “food miles” will most likely increase the environmental impact of any given food. Student Answer: True CORRECT False Instructor Explanation: The answer can be found in Section 3.5 of your text. Points Received: 1 of 1 Comments: 2. ...
*Monday, September 23, 2013 at 11:55pm*

**Engineering**

Steel column is 80 feet tall. Column is a W 14 x 730(wide-flange beam) The cross sectional area is 215 sq in. Supports a floor load of 6600 K. Determine the stress in the column and how much it will shorten due to the 6600K load. (Assume E= 29,000,000 lb/sq in)
*Saturday, September 14, 2013 at 3:07pm*

**ENGINEERING ECONOMY**

A man bought a house and a lot worth P300000. The annual amortization of the house and lot is P34200. Determine rate of interest he was changed?
*Monday, September 9, 2013 at 4:43am*

**Environmental Engineering**

To clarify the 'figure': Q, C(0) are the inflow parameters into the first pond. Q, C1 are parameters from pond 1 as it is about to enter pond 2. Q, C2 are outflow parameters from the second pond. Pond 1 has parameters V, C1, k1. Pond 2 has parameters V, C2, k2. Thanks...
*Monday, August 26, 2013 at 12:19pm*

**Environmental Engineering**

The two ponds in the figure below can be modeled as completely-stirred tank reactors (CSTRs) in series. The first-order decay rates for each pond are different but the inflow and outflow rates and volumes for the two ponds are the same. a. Write a mass-balance (differential) ...
*Monday, August 26, 2013 at 12:16pm*

**Science**

Which of the following is an environmental concern of genetically engineered crops mentioned in your text? (Points : 1) Genetically modified crops lead to larger applications of toxic herbicides and insecticides. The genetic modification of crops increases soil erosion while ...
*Thursday, August 22, 2013 at 11:48pm*

**engineering**

A thermometer is used to measure the temperature of a gas flow through a pipe. The gas temperature is read at 500°C and the duct temperature is measured to be 350°C. The thermometer is cylindrical with a diameter of 1 mm and an intrusion length of 1 cm. It can be ...
*Wednesday, August 14, 2013 at 11:17am*

**Vocabulary**

choose the term that matches the definition. building and construction. a.architecture b. engineering c.nursing d.statistics b
*Saturday, July 20, 2013 at 10:34pm*

**Vocabulary**

Building and construction A. Architecture B. Engineering C. Nursing D. Statistics im pretty sure its A
*Wednesday, July 17, 2013 at 1:35am*

**physics**

http://engineering.myindialist.com/2009/difference-between-a-heat-engine-refrigerator-and-heat-pump/#.UdxFaztM9u0
*Tuesday, July 9, 2013 at 1:17pm*

**Environmental Control Engineering **

A development in a town was designed to accomodate 10,000 people, in 2,000, 5 units building, each person in this settlement uses an average of 5 gallons of water per day for washing purposes. As an engineering technician you are required to design a waste water treatment ...
*Monday, July 8, 2013 at 9:24pm*

**element of chemical engineering**

the specific internal energy of a fluid is 200 cal/g .if the fluid leaves a system at a flow rate of 5 g/min ,at what rate does it transport internal energy out of the system?
*Wednesday, July 3, 2013 at 12:45pm*

**Mechanial engineering**

HW7_1A_1 P*(1-a/(a+b))*x -(a/(a+b))*P*x+P*a HW7_1A_2 -(a/(a+b))*P*a+P*a a HW7_1A_3 2
*Monday, July 1, 2013 at 12:19pm*

**Mechanial engineering**

HW7_1A: BENDING MOMENT DIAGRAMS AND STRESSES, PART I We will obtain bending moment diagrams for three beams and calculate stresses inside the beams. For each beam, take the x-axis along the neutral axis of the beam, oriented from left to right, with origin at A. HW7_1A_1 : 5.0...
*Sunday, June 30, 2013 at 12:19pm*

**computer science & engineering**

15
*Tuesday, June 25, 2013 at 1:14pm*

**ECONOMICS/ACCOUNTING/BUSINESS**

PLS HELP, BEEN STUCK FOREVER ON TWO QUESTIONS, THIS IS ONE : There are usually no costs for the first 3 years, but thereafter maintenance is re- quired for restriping, weed control, light replacement, shoulder repairs, etc. For one section of a particular highway, these costs ...
*Monday, June 24, 2013 at 2:22am*

**Engineering science**

a=(vf-Vi)/time change km/hr to m/s force=mass*a
*Friday, June 21, 2013 at 10:39am*

**Engineering science **

A lorry has a mass of 5640kg and accelerates uniformly from rest to reach a velocity of 100km/h in 10s. Determine the acceleration of the lorry. Determine the force needed to accelerate the lorry
*Friday, June 21, 2013 at 10:26am*

**Mechanical Engineering**

This is engineering? Hmmmm. Vf^2=Vi^2 + 2 ad Vf^2=12f/s+2*-32f/s^2*-4.5 Vf^2=288 Vf=12 sqrt2 fps check that
*Friday, June 21, 2013 at 4:50am*

**Mechanical Engineering**

a tennis ball was held 4.5 ft above the surface of a tennis court and was thrown vertically downward with an initial velocity whose magnitude was 12 fps. determine the magnitude of the velocity of the ball just before it struck the surface of the court
*Friday, June 21, 2013 at 12:38am*

**Chemical Engineering**

BDABCADBAB
*Friday, June 14, 2013 at 4:56pm*

**petroleum engineering physics **

Vector A has a magnitude of 5.00units,and B has a magnitude of 9.00units.The two vectors make an angle of 50.0degrees with each other .Find A.B.
*Wednesday, June 12, 2013 at 6:48pm*

**Engineering**

6-1C
*Wednesday, June 12, 2013 at 4:01pm*

**Engineering**

HW6_1B: (2*Q*L^2)/(G*pi*t*d_A^2*(L+x)^2) Why? You have to start by describing the linear function of diameter/radius variations (whatever) r(x)=(d_A/2L)*x+d_A/2 d_A(x)=(d_A/L)*x+d_A We can obtain I(x)=pi*t*d_A^3*(x+L)^3/(4*L^3) We know that gamma=r(x)*(d_Phi/d_x) and d_Phi/d_x...
*Wednesday, June 12, 2013 at 3:40pm*

**Engineering**

anyone has hw6_1B answer?
*Tuesday, June 11, 2013 at 9:59am*

**Engineering**

6_3 = 8*phi_m*G*I_p/(L^2)
*Tuesday, June 11, 2013 at 7:25am*

**Engineering**

6_2A= -t_0*x 6_2B= -t_0*(x^2-L^2)/(8*pi*G_0*R^4) 6_2C= -L^2*t_0/(8*pi*G_0*R^4) 6_2D= 5*t_0*L/(4*pi*R^3) 6_3= 8*psi*G*I_o/(L^2) i need 6_1B
*Tuesday, June 11, 2013 at 12:38am*

**Engineering**

6.1B, 6.1C, 6_2a to 6_2d, 6_3
*Tuesday, June 11, 2013 at 12:19am*

**Engineering**

HW6_1A : 2*d_A^3*pi*t*G/(3*L )
*Monday, June 10, 2013 at 3:54pm*

**Engineering**

tapered thin-wall circular shaft has constant wall thickness, t, length L, and diameters linearly varying between dA at the support A(x=0) and dB at its free end B(x=L). The shaft is homogeneous with shear modulus G HW6_1A : 20.0 POINTS Obtain a symbolic expression for the ...
*Saturday, June 8, 2013 at 3:24pm*

**Engineering**

gamma= r*Q/(L*Kt)
*Saturday, June 8, 2013 at 5:13am*

**Engineering**

There is no figure.
*Friday, June 7, 2013 at 2:37pm*

**Engineering**

Help with the rest?
*Friday, June 7, 2013 at 2:07pm*

**Engineering **

A 10.0 Kg block is released from point A in the figure below. The block travels along a smooth frictionless track. It makes a collision with stationary 10 kg ball. The ball moves forward with speed of 2 m/s. a) What is the speed of the block at point C? b) What is the velocity...
*Friday, June 7, 2013 at 1:39pm*

**engineering**

Let’s suppose the message x(t) is an analog signal shown in the figure below. a) Draw the block diagrams of the system which converts the analog message signal x(t) to a pulse modulated signal. b) Draw the sampled signal with the sampling frequency fs=2khz c) Carry out ...
*Thursday, June 6, 2013 at 1:01pm*

**Engineering**

22/7*pi*t*G/L
*Thursday, June 6, 2013 at 2:14am*

**Engineering**

A tapered thin-wall circular shaft has constant wall thickness, t, length L, and diameters linearly varying between dA at the support A(x=0) and dB at its free end B(x=L). The shaft is homogeneous with shear modulus G HW6_1A : 20.0 POINTS Obtain a symbolic expression for the ...
*Wednesday, June 5, 2013 at 5:04pm*

**Engineering**

can anyone post the solutions pls!!
*Tuesday, May 28, 2013 at 5:29am*

**Engineering**

All you guys are awesome !! Thanks a billion !! :D
*Tuesday, May 28, 2013 at 3:42am*

**Engineering**

Q1_2_3 (25/12*W*H)/A_0*E_0
*Monday, May 27, 2013 at 4:17pm*

**Engineering**

Q1_2 _1 400 500 699.99 665.68
*Monday, May 27, 2013 at 3:56pm*

**Engineering science**

Hints: Kinetic energy, KE=(1/2)mv² where m=mass of object (kg) v=velocity (m/s) Potential energy =mgh m=mass in kg g=acceleration due to gravity, m/s-2 h=height above datum in m. To calculate h, you need the distance travelled. For uniform acceleration, distance d, is the...
*Sunday, May 26, 2013 at 10:48am*

**Engineering science**

A vehicle with a mass of 1200 kg accelerates uniformly from rest upwards with an incline of 1:25 and reaches a speed of 72 km/h after 2 minutes,calculate: 1.The kineyic energy of the vehicle after 2 minutes 2.The potential energy of the vehicle after 2 minutes
*Sunday, May 26, 2013 at 10:16am*

**Engineering**

Please post 1_4 all parts
*Friday, May 24, 2013 at 11:14pm*

**Engineering**

Obtain symbolic expressions for the maximum tensile and compressive stresses ( σmax,Tn and σmax,Cn )and their locations (coordinates xmax,T and xmax,C ) in terms of ρ, g, L (with ρ written as rho). (Note: enter the expressions for the stresses with their ...
*Friday, May 24, 2013 at 7:45pm*

**Engineering**

I need all four parts for 1-1-4
*Friday, May 24, 2013 at 6:53pm*

**Engineering**

I need Tn and Cn
*Friday, May 24, 2013 at 6:52pm*

**Engineering**

I need Tn and Cn
*Friday, May 24, 2013 at 6:09pm*

**Engineering**

Q1_1_4 I only have the locations T=0 C= 3*L
*Friday, May 24, 2013 at 5:57pm*

**Engineering**

Q1_1_4 I only have the locations T=0 C= 3*L
*Friday, May 24, 2013 at 5:57pm*

**Engineering**

Q1_1_4 : 80.0 POINTS Obtain symbolic expressions for the maximum tensile and compressive stresses ( σmax,Tn and σmax,Cn )and their locations (coordinates xmax,T and xmax,C ) in terms of ρ, g, L (with ρ written as rho). (Note: enter the expressions for the ...
*Friday, May 24, 2013 at 5:45pm*

**Engineering**

1-1-4
*Friday, May 24, 2013 at 5:38pm*

**Engineering**

1000 bone cookies dog
*Friday, May 24, 2013 at 5:33pm*

**Engineering**

1_1_2 -A*g*L*rho
*Friday, May 24, 2013 at 5:30pm*

**Engineering**

1_1_2 -A*g*L*rho
*Friday, May 24, 2013 at 5:30pm*

**Engineering**

Q1_1_2 : 100.0 POINTS Use the force method for statically indeterminate structures to obtain a symbolic expression for the reaction RCx at the support C in terms of ρ, g, A, L (with ρ written as rho): Obtain symbolic expressions for the maximum tensile and ...
*Friday, May 24, 2013 at 5:15pm*

**Engineering**

1-1-2, 1-1-4
*Friday, May 24, 2013 at 5:06pm*

**Engineering**

Great dog
*Friday, May 24, 2013 at 4:47pm*

**Engineering**

Thanks dog
*Friday, May 24, 2013 at 4:43pm*

**Engineering**

UX(=2l) (3*g*L^2*rho)/(8*E)
*Friday, May 24, 2013 at 4:35pm*

**Engineering**

1_2 also
*Friday, May 24, 2013 at 4:11pm*

**Engineering**

Please post the answers for 1_4 and 1_5
*Friday, May 24, 2013 at 3:26pm*

**Engineering**

Help with Question 1_1_2, 1-1-4, 1-1-5? SERIOUS ANSWERS NEEDED Use the force method for statically indeterminate structures to obtain a symbolic expression for the reaction RCx at the support C in terms of ρ, g, A, L (with ρ written as rho): Obtain symbolic ...
*Friday, May 24, 2013 at 2:21pm*

**Engineering**

Q1_1_3 0<x<L rho*g*A*(L-x) L<x<3L (rho*g*A)/2*(L-x)
*Friday, May 24, 2013 at 2:13pm*

**Engineering**

Q11 2 always false
*Friday, May 24, 2013 at 1:51pm*

**Engineering**

Q.1_1_1 rho*g*A 1/2*rho*g*A Q.1_1_2 -2*rho*g*A*L
*Friday, May 24, 2013 at 1:37pm*

**Engineering**

No it is not good Jason
*Friday, May 24, 2013 at 12:57pm*

**Engineering**

Q1_1_2. My answer is -4*rho*A*g*L
*Friday, May 24, 2013 at 12:50pm*

**Engineering**

Use the force method for statically indeterminate structures to obtain a symbolic expression for the reaction RCx at the support C in terms of ρ, g, A, L (with ρ written as rho): RCx= incorrect 34⋅ρ⋅g⋅A⋅L You have used 1 of 3 submissions ...
*Friday, May 24, 2013 at 12:16pm*

**Engineering**

Sorry, just noticed Q1_1_1: 3/2*rho*g*A is WRONG! It is 0.5*rho*g*A as trustee says.
*Friday, May 24, 2013 at 11:43am*

**Engineering**

Anyone for the rest please?
*Friday, May 24, 2013 at 11:33am*

**Engineering**

Q1_2_4= 300 mm^2
*Friday, May 24, 2013 at 11:33am*

**Engineering**

These are my results (done by me): Q1_1_1 rho*g*A 3/2*rho*g*A Q1_2_1 400 500 700 565.685424 Q1_2_2 -800 -300 0 700 Q1_2_3 ((W*1.25)*(5/3*H))/(A_0*E_0) need the rest...
*Friday, May 24, 2013 at 11:11am*

**Engineering**

In my case it was 500 guys, just try it.
*Friday, May 24, 2013 at 10:34am*

**Engineering**

q1-2 wrong
*Friday, May 24, 2013 at 10:34am*

**Engineering**

Thanks simonsay, in q1_2_1: 300 is wrong for me, is there maybe a -300?
*Friday, May 24, 2013 at 10:30am*

**Engineering**

q1_2_1 400, 300, 700, 565.685 q1_2_2 -800, -300, 0, 700
*Friday, May 24, 2013 at 10:19am*

**Engineering**

Trustee thanks the first two answers right but third one is wrong, can you check please?
*Friday, May 24, 2013 at 9:36am*

**Engineering**

3/4*rho*g*A*L is not good answer
*Friday, May 24, 2013 at 9:29am*

**Engineering**

1. rho*g*A 2, 0.5*rho*g*A 3. 3/4*rho*g*A*L
*Friday, May 24, 2013 at 8:44am*

**Engineering**

Anyone?
*Friday, May 24, 2013 at 8:23am*

**Engineering**

Any help please?
*Friday, May 24, 2013 at 4:19am*

**Engineering**

Anyone please?
*Thursday, May 23, 2013 at 4:32pm*

**Engineering**

Please help!
*Thursday, May 23, 2013 at 3:34pm*

**Engineering**

The bar in the figure has constant cross sectional area A. The top third of the bar, of length L, is made of a material with mass density ρ and Young's modulus E. The bottom two thirds of the bar (length 2L) is made of a different material, with density ρ/2 and ...
*Thursday, May 23, 2013 at 2:00pm*

**Engineering Physics**

An ideal gas at 12.1 °C and a pressure of 2.38 x 105 Pa occupies a volume of 2.88 m3. (a) How many moles of gas are present? (b) If the volume is raised to 4.70 m3 and the temperature raised to 28.3 °C, what will be the pressure of the gas?
*Wednesday, May 22, 2013 at 9:01pm*

**Mechanical Engineering**

A load W=2 kN is applied vertically to joint C of truss ABCDE as indicated. You will use the method of joints to obtain the axial forces in the bars and reactions at the supports A, E . We start with the classification of the degrees of freedom as "free" or "...
*Sunday, May 19, 2013 at 9:13pm*

**physics**

Name of physics book for 11 and 12.to catch engineering exam and other competetive exam
*Monday, May 13, 2013 at 2:55pm*

**Engineering**

use fomular P*v=n*R*T cause temperature and volumn not change: n(initial)=(P(initial)*V)/(R*T) n(final)=(P(final)*V)/(R*T) we want the final n, therefore: n(final)=P(final)*n(initial)/P(initial) =5.3*1.2/28.5=0.223
*Wednesday, May 8, 2013 at 8:34am*

**Chemical engineeing **

Can someone help me with online exam ( fundamental of chemical engineering class ) ? Please eamil me ( davd_jo(at)(ya h o o )dot (com ) I'll offer money
*Monday, May 6, 2013 at 5:45pm*

**MECHANICAL ENGINEERING**

design a hydraulic jack with 1000kn and which can left 0
*Sunday, April 28, 2013 at 4:55pm*

**Engineering**

m*v^2/R=mg centripetal force=the weight under the condition that traveled without losing contact with the sphere --> g= v^2/R--> v=(2gR)^(1/2)=(2*9.8*13.4)^(1/2)=16.206
*Sunday, April 28, 2013 at 12:39pm*

**Engineering **

A physics major is working to pay his college tuition by performing in a traveling carnival. He rides a motorcycle inside a hollow transparent plastic sphere. After gaining sufficient speed, he travels in a vertical circle with a radius of 13.4 . The physics major has a mass ...
*Sunday, April 28, 2013 at 11:16am*

**Physics**

An elevator cable can withstand a maximum tension of 1.89×104N before breaking. The elevator has a mass of 480kg and a maximum acceleration of 2.25m/s^2 . Engineering safety standards require that the cable tension never exceed two-thirds of the breaking tension.
*Friday, April 19, 2013 at 9:28pm*

**MECHANICAL ENGINEERING**

Need help with some engineering math problems? 1. You wish to determine the total system efficiency of your hydraulic press that is powered by an electric motor. The characteristics of the hydraulic press are as follows: •Electric motor utilizes 5 amps under load & ...
*Thursday, April 18, 2013 at 1:07am*

**engineering**

F = 9C/5 + 32 = 80 9c/5 = 80-32 = 48 9c = 240 C = 26.67o Celsius.
*Tuesday, April 9, 2013 at 9:17pm*

**Engineering**

The power plant is to be operated in a region where the same company operates several other coal fired power plants that were all built in the 1960s. The new power plant is planned to have 500 MW energy generating capacity. The next largest plant is 50 MW and each is emitting ...
*Tuesday, April 9, 2013 at 5:50pm*

**Engineering**

The power plant is to be operated in a region where the same company operates several other coal fired power plants that were all built in the 1960s. The new power plant is planned to have 500 MW energy generating capacity. The next largest plant is 50 MW and each is emitting ...
*Tuesday, April 9, 2013 at 5:47pm*

**Air pollution Engineering**

The power plant is to be operated in a region where the same company operates several other coal fired power plants that were all built in the 1960s. The new power plant is planned to have 500 MW energy generating capacity. The next largest plant is 50 MW and each is emitting ...
*Tuesday, April 9, 2013 at 5:03pm*

**stat probability**

At a certain college, there were 780 science majors, 320 engineering majors, and 390 business majors. If one student was selected at random, the probability that they are a business major is?
*Monday, April 8, 2013 at 7:38pm*

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