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April 17, 2014

Homework Help: Science: Engineering

Recent Homework Questions About Engineering

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World History
How were the Byzantine's Engineering geniuses? Take two or three of their engineering feats and discuss how these marvels led to the empire's overall success.
Wednesday, April 3, 2013 at 8:45pm

MATH
An engineering consultant bids on jobs where he can make $10000 profit. If in a certain month, he has a 20% probability of getting a contract, 30% probability of getting 2 contracts, 40% probability of getting 3 contracts, and 10% probability of getting 4 contracts, what is ...
Wednesday, April 3, 2013 at 3:50pm

civil engineering
a. at the top, vf=0 vf=vi-9.8t b. hf=hi-1/2 g t^2 c. double time in a. d. vf=vi-1/2 9.8 t e.
Monday, April 1, 2013 at 7:58am

civil engineering
A stone (on the edge of the roof) thrown from the top of a building is given an initial velocity of 20.0 m/s straight upward. The building is 50.0 m high, as shown in Fig. 4. Using tA = 0 as the time the stone leaves the thrower’s hand at position ○A . The ...
Monday, April 1, 2013 at 7:09am

engineering mechanics
from what height must a heavy elastic body be dropped on a floor so that after rebounding thrice it will reach a height of 16m?take e=0.5
Sunday, March 31, 2013 at 12:41pm

engineering mathematics
check your typing, How many vessels in every 10 are wrecked ?
Sunday, March 31, 2013 at 8:17am

engineering mathematics
if on an average vessel in every 10 wrecked.find the probability that out of 5 vessels expected to arrive at least 4 will arrive safetly?
Sunday, March 31, 2013 at 2:40am

engineering physical
An elevator with a man inside, of gross mass 500KG, starts moving upwards with a costant acceleration and acquires a velocity os 2m/s after travelling a distance os 3m.Find the pull in the cables during the accelerated motion. If the elevator, before stopping, moves with a ...
Tuesday, March 26, 2013 at 12:03am

Ýndustrial Engineering
a. h = Yo*t + 4.9g*t^2 = 17.02 m Yo*2.94 - 4.9*(2.94)^2 = 17.02 2.94Yo - 42.35 = 17.02 2.94Yo = 17.02 + 42.35 = 59.37 Yo = 20.2 m/s = Ver. component of initial velocity. Dx = Xo*2.94 = 41 Xo = 13.95 m/s = Hor. component of initial velocity. tanA = Yo/Xo = 20.2/13.95 = 1.44803 ...
Tuesday, March 19, 2013 at 8:13pm

Ýndustrial Engineering
The figure shows the paths of a golf ball your friend drops from the window of her apartment and of the rock you throw from the ground at the same instant. The rock and the ball collide at x = 41.00 m, y = 17.02 m, and t = 2.94 s. If the ball was dropped from a height of h = ...
Monday, March 18, 2013 at 12:08pm

engineering mechanics
How can there be two values of w at the same time? Is one of those two numbers (1 and 2) an angular acceleration?
Sunday, March 17, 2013 at 3:01am

engineering mechanics
Pls anr give me
Sunday, March 17, 2013 at 12:31am

engineering mechanics
A vehicle on a monorail has a speed S = 10 m/s and an acceleration S=4m/s 2 relative to the ground reference XYZ when it reaches point A. Inside the vehicle, a 3 kg mass slides along a rod which at the time of interest is parallel to the X axis. This rod rotates about a ...
Sunday, March 17, 2013 at 12:13am

statistics
The Engineering Department Claims the Average Battery Lifetime is 500 Minutes. You wish to check whether the lifetime is different from 500 Minutes. What type of hypothesis test is it going to be?
Wednesday, March 13, 2013 at 6:35pm

Physics-VASTS
The Mass Budget: Mars Reconnaissance Orbiter Repair Mission Operational Concept Math Problem: The Mars Reconnaissance Orbiter (MRO) has encountered a failure in its High Resolution Imaging Science Experiment (HiRISE) camera. Mission Case: As the HiRISE camera contains the ...
Thursday, March 7, 2013 at 4:29pm

engineering science N4
A = (-21.2,21.2) B = (-19.3,-23.0) B-A = (1.9,-44.2) = 44.2,-87.5° or 44.2km/hr S2.5°E
Monday, March 4, 2013 at 2:28pm

engineering science N4
You add them as vectors. Vbreltoa=velocityb-veloictya AS VECTORS
Monday, March 4, 2013 at 2:28pm

engineering science N4
Two ships leave port simultaneously. Ship A sails north-west at 30 km/h and ship B sails S 40 degrees W at 30 km/h. Calculate the velocity of ship B relative to the velocity of ship A.
Monday, March 4, 2013 at 1:57pm

Sound engineering
A Question of engineering about Sound. How to calculate in step by step? Thank you. The octave bands¡¦ Sound pressure levels in dB re 20 £g Pa are: Hz 57 129 220 420 1K 2K 4K 8K dB 85 95 90 80 88 70 68 72 What is the overall A-weighted sound pressure level?
Thursday, February 28, 2013 at 12:05am

MONGU COLLEGE
perpendicular to 5x-2y=10 2y=5x-10 x=2.5 x-2 slope is 2.5, so slope of line perpendicular is -1/2.5 or -2/5 y=-2/5 x + b but it goes thru 0,0 0=-2/5 (0)+b so b = 0 equation of the line: y=-2/5 x Rx in communication skills? I don't know. In Communication (Electronics) ...
Tuesday, February 26, 2013 at 7:52pm

Engineering Economy
What is the future worth of $1,000 in month 1, $1,040 in month 2, and amounts increasing by $40 per month through month 12, at the end of year 2 if the interest rate is 23.7631528% per year, compounded continuously?
Tuesday, February 26, 2013 at 11:59am

Engineering Econonmy
You decide to open an IRS-approved retirement account at your local brokerage firm. Your best estimate is that it will earn 9 percent. At the end of each year for the next 25 years, you will deposit $4000 per year into the account (25 total deposits). 3 years after the last ...
Saturday, February 23, 2013 at 7:13am

Engineering Maths
help solving the ffg. differential equation: dy/dx +ytanx=y^3sec^4x
Friday, February 22, 2013 at 2:56pm

Engineering Maths
Pleas help solve the ffg. differential equation: dy/dx-(1+1/x)y=y^2
Friday, February 22, 2013 at 2:54pm

Engineering Maths
please help solve this differential equation: x^3+(y+1)^2 dy/dx=0
Friday, February 22, 2013 at 2:52pm

engineering science
Its Engineering Science
Friday, February 22, 2013 at 2:32pm

Engineering Econonmy
To determine what you would have at the end of 3 or 5 years use: The following formula works for compounded annually. future value = P(1+r)^n for 1500 and 3 years at 8% 1500(1+.08)^3 Do this calculation and a similar one for the 5 year period and then compare.
Thursday, February 21, 2013 at 3:55pm

Engineering Econonmy
For your 21st birthday, your grandfather offers you a gift of $1000 today. However, you have the choice of waiting 3 years and receiving $1500 OR waiting 5 years and receiving $3000. If your money grows at a rate of 8 percent compounded annually, which alternative should you ...
Thursday, February 21, 2013 at 3:51pm

engineering
a ship is 100km north west of cape town harbour and it sails directly north at a velocity of 30km/h in ei ght hours.calculate its resultant speed with reference to the cape town harbour in magnitude and direction
Wednesday, February 20, 2013 at 2:51pm

Feature-Story Ideas
Nobody ever writes stories on the civil engineering aspects of modern life. Big electric (why do the lights stay on?), Big gas (Why does it mostly not explode?) Big water (where are the ~20ft cir.? pipes that feed the area, and why do they continue to exist?) Most importantly...
Wednesday, February 20, 2013 at 7:58am

engineering
Anybody knows the quiz3 of coursera "control of mobile robots"?
Monday, February 11, 2013 at 2:46pm

University, Engineering Math
Hi.. that website is not helping much
Sunday, February 10, 2013 at 5:58am

engineering
1kg=9.81newton 75kg(9.81)=735.75newton tension stess= p/a 1.25kn/cm^2=0.73575kn/a a=1.6989 cm^2 a=3.1415/4(d^2) 1.6989=3.1415/4(d^2) d=1.471 cm edsel salariosa research and development engineer
Sunday, February 10, 2013 at 12:39am

world history
Explain the importance of Roman technology and engineering? Cover two separate kinds of Roman technology and engineering.
Friday, February 8, 2013 at 3:10pm

english (theses writing)
Wouldn't it depend on what and why you are writing? IT seems to me, if you are writing a short essay, you ought to greatly narrow the topic. I am reminded of Thoreau's Walden Pond. The thesis of each essay was written so that its meaning could be discerned by inference...
Friday, February 8, 2013 at 8:36am

english (theses writing)
hello! :) I am a freshman college student and I am looking for a thesis topic about civil engineering.Can you give me a topic on my thesis about civil engineering? thanks :)
Friday, February 8, 2013 at 7:39am

english (theses writing)
Can you give us a topic on our thesis about civil engineering?
Friday, February 8, 2013 at 7:29am

University, Engineering Math
wolframalpha.com and http://wood.mendelu.cz/math/maw-html/ind​ex.php?lang=en&form=ode can solve many ODE's
Tuesday, February 5, 2013 at 11:47am

University, Engineering Math
solve the ffg. differential equations: 1. x^3 +(y+1)^2 dy/dx=0 2. dy/dx-(1+1/x)y=y^2 3. dy/dx + ytanx=y^3sec^4x
Tuesday, February 5, 2013 at 10:27am

Engineering Math
sorry didn't mean to lol but it is lol
Monday, February 4, 2013 at 9:37am

Engineering Math
lol
Monday, February 4, 2013 at 9:36am

Engineering Math
LJMU i bet u
Saturday, February 2, 2013 at 10:30am

Engineering Math
LJMU i bet u
Saturday, February 2, 2013 at 10:30am

Intro to Computer Engineering
5*8^2 - 5b(8) + b^2+2b+5 = 0 b^2 -38b + 325 = 0 b = 13,25 check: base 13 5*8*8 = 328 50*8 = 520 125 = 200 328-520+200 = 0 base 25 5*8*8 = 0 12 20 (base 25) 125 = 1 2 5 add: 1 15 0 50*8 = 1 15 0 subtract: 0
Thursday, January 31, 2013 at 2:34pm

Intro to Computer Engineering
When solving 5x^2-50x+125=0, a space alien got x=8 for one of the two roots. What possible base could the alien be using? (Note: the coefficients are also in this base. That is 5,50,125 are all in this mystery base as well)
Thursday, January 31, 2013 at 1:29pm

Math
A mechanical engineering student wishes to inscribe a rectangle in a quarter circle of radius 2.00 cm. Determine the dimensions of the rectangle that will give it the greatest area. length in cm = height in cm = My attempt on find the relationship between the rectangle and the...
Tuesday, January 29, 2013 at 8:45am

Engineering Math
A Theme Park site is being designed. It will occupy a rectangular piece of land 800m by 600m. There are to be 4 particularly noisy rides. The ‘Drumbeat’ uses music which reaches a level of 95dB(A). The ‘Bigdrop’ generates screams which can reach 98dB(A). ...
Monday, January 28, 2013 at 10:05am

Engineering Math
A Theme Park site is being designed. It will occupy a rectangular piece of land 800m by 600m. There are to be 4 particularly noisy rides. The ‘Drumbeat’ uses music which reaches a level of 95dB(A). The ‘Bigdrop’ generates screams which can reach 98dB(A). ...
Monday, January 28, 2013 at 10:01am

electrical engineering
3c, 5c
Thursday, January 17, 2013 at 11:36am

engineering
the pringles manufacturing company tells you that they are switching to a potato supply that has a higher moisture content than those used previously. The new supply, after being mashed an cooked, prior to drying for pringles production, now contains 70% moisture content. they...
Thursday, January 17, 2013 at 11:27am

engineering
Your friend, a 75 kg mountain climber is suspended from a cliff by a rope. Calculate the tension in the rope, in Newtons, when you lift your friend to safety. If the rope can withstand 1.25 kN of stress per square centimeter of cross-sectional area, what minimum diameter of ...
Thursday, January 17, 2013 at 11:17am

7th grade science ASAP
1. How many chromosomes do human sex cells have? (1 point) 22 43 46 23 2. The actual genetic makeup of an organism for a particular trait is called the ______. The physical characteristic that trait gives the organisms is called the ______. (1 point) genotype; phenotype genome...
Wednesday, January 16, 2013 at 8:55pm

7th grade science
1. How many chromosomes do human sex cells have? (1 point) 22 43 46 23 2. The actual genetic makeup of an organism for a particular trait is called the ______. The physical characteristic that trait gives the organisms is called the ______. (1 point) genotype; phenotype genome...
Wednesday, January 16, 2013 at 8:21pm

SOCIAL STUDIES URGENT!!
1. When people talk about natural resources, they usually mean (1 point) vegetation. water. minerals. all of the above 2. Geothermal energy is considered a (1 point) fossil fuel. renewable resource. nonrenewable resource. recyclable resource. 3. Minerals, coal, and natural ...
Wednesday, January 16, 2013 at 1:16am

engineering mechanics
A person A is trying to keep his balance while on a sled B that is sliding down an icy incline. Let mA = 78kg and mB = 25 kg be the masses of A and B, respectively. In addition, let the static and kinetic friction coefficients between A and B be μs = 0.4 and μk = 0....
Monday, December 31, 2012 at 7:58pm

maths
Engineering -- E Science ------ S Prob (E is picked from 1st group) = 3/8 prob(E is picked from the 2nd group) = 5/8 first picking is determined by a die toss of 3 or 5 which has a prob of 2/6 or 1/3 2nd picking is determined by any other die toss which is 2/3 prob of your ...
Friday, December 28, 2012 at 8:27am

maths
5. There are two groups of subjects one of which contains 5 science subjects and 3 engineering subjects and the other consists of 3 science and 5 engineering subjects. An unbiased die is cast. If the number 3 or number 5 turns up, a subject is selected at random from the first...
Friday, December 28, 2012 at 4:00am

engineering
45 MN/900Gg
Monday, December 24, 2012 at 4:30am

engineering economic
a. P1 = Po(1+r)^n. r = (6%/100%) = 0.06 = APR expressed as a decimal. n = 1Comp./yr * 5yrs = 5 compounding periods. P1 = $2676.45. b. P2 = Po + Po*rt. P2 = 2000 + 2000*0.07*5 = $2700.
Thursday, December 20, 2012 at 6:02pm

engineering economic
Ahmad is considering investing RM2000 to Ali's project at an interest rate 6% compound annually for 5 years or investing RM2000 to Rosli at 7% per year simple interest for 5 years. From your point of view which option is better and state your reason
Tuesday, December 18, 2012 at 4:45pm

Biology
Suppose you are a scientist trying to help people who cannot produce an enzyme needed for proper digestion. How could you use genetic engineering techniques to make transformed bacteria that produce the enzyme?
Monday, December 17, 2012 at 5:17pm

math To MS.SUE
I wouldn't worry much about missing one problem because of a minor error. Many very smart engineers and mathematicians make minor errors. My son, now with a masters in engineering from Stanford, didn't ace all of his high and middle school tests because he usually made...
Sunday, December 16, 2012 at 4:58pm

Fundamental Of Chemical Engineering
OK what about if we have all this equations: H2SO4→ so3+H2O SO3→ SO2+1\2O2 SO2→ S+O2
Saturday, December 15, 2012 at 1:08pm

Fundamental Of Chemical Engineering
so, now you know the relative amounts (in moles) of the various compounds. 10 tons of 98% acid is 9.8 tons of H2SO4 convert tons to moles (at 98g/mol) for each mole of S you need 1.5 moles of O2 and 1 mole of H2O. Now, if you have to account for the fact that air is not pure ...
Saturday, December 15, 2012 at 12:24pm

Fundamental Of Chemical Engineering
They didn't give us an equation but I write this, I don't now if it's right or not. SO3 (g) +H2O (l) → H2SO4 (l)
Saturday, December 15, 2012 at 12:14pm

Fundamental Of Chemical Engineering
why don't you at least provide the balanced equation used for industrial production of H2SO4? In doing so, you will have almost solved the problem.
Saturday, December 15, 2012 at 11:33am

Fundamental Of Chemical Engineering
If a sulfuric acid plant is to produce 10 ton/day of 98% sulfuric acid, How much sulfur is needed, how much air is required and how much water is used?
Saturday, December 15, 2012 at 11:30am

Fundamental Of Chemical Engineering
If a sulfuric acid plant is to produce 10 ton/day of 98% sulfuric acid, How much sulfur is needed, how much air is required and how much water is used?
Saturday, December 15, 2012 at 11:11am

biology
genetic engineering can provide a variety of advantages and disadvantages to today's society. what are current scientists more likely to learn from transgenic animals than from transgenic bacteria or transgenic plants?
Thursday, December 13, 2012 at 2:52pm

7th grade science
1. A Punnett square shows you all the ways in which ____ can combine. (1 point) alleles eggs sperm colors 2. Mendel called plants that received different alleles for a trait from each parent ____. (1 point) hybrids dominant genotypes phenotypes 3. Which is a possible genotype ...
Wednesday, December 12, 2012 at 10:27pm

8th Grade Math
1.8*10^7 is correct. In engineering notation, 18*10^6
Wednesday, December 12, 2012 at 10:02pm

Engineering Fund.
Since the force 235 N is at an angle, you want it to be parallell with the ground. To do that you do the cosine of the angle multiplied by the force. So 235*cos34.8 = 192.97 N Using F=ma 192.97=19a so a= 10.1563 m/s^2
Wednesday, December 12, 2012 at 3:03pm

civil engineering
the propane gas tank has an inner diameter of 1500mm and wall thickness of 15mm. If the wall is pressurized to 2MPa, determine the absolute maximum shear stress in the wall of tank.
Tuesday, December 11, 2012 at 7:33am

Science help needed
Posted by This Girl on Thursday, December 6, 2012 at 1:41pm. 1. __________ is one type of genetic engineering, in which a normal allele is placed into a virus. (1 point) A color blind test Down syndrome Gene therapy Polygenic inheritance 2. Human insulin can be produced by ...
Thursday, December 6, 2012 at 4:43pm

This is Urgent Science
1. __________ is one type of genetic engineering, in which a normal allele is placed into a virus. (1 point) A color blind test Down syndrome Gene therapy Polygenic inheritance 2. Human insulin can be produced by _______, which introduces DNA from one organism into a _______...
Thursday, December 6, 2012 at 2:52pm

Science
1. __________ is one type of genetic engineering, in which a normal allele is placed into a virus. (1 point) A color blind test Down syndrome Gene therapy Polygenic inheritance 2. Human insulin can be produced by _______, which introduces DNA from one organism into a _______...
Thursday, December 6, 2012 at 1:41pm

Chemical Engineering
The pressure is constant, and so the heat at constant pressure is qp = - dH vaporization. W=-pdV and so since p=pext=1atm and dV = (vf - vi) = vliquid - vvapor, we'll say that since the volume of the vapor is significantly greater than that of the liquid, then vf-vi is ...
Saturday, December 1, 2012 at 6:10pm

university, physics
current=power/120 a. do the math b. add them c. Hmmmm. You ought to do engineering estimates first. 1200w is about 10 amp 1100 watts is about 10 amps 1400 watts is about 10 amps That answers the last part pretty easily.
Monday, November 26, 2012 at 4:21pm

engineering
Resultant of what other forces? What is ox? To come up with numerical answers, other numbers must be provided.
Tuesday, November 20, 2012 at 7:33am

engineering
Determine the resultant force and its inclination with ox
Tuesday, November 20, 2012 at 5:26am

Chemical Engineering: Raoult's Law
A binary mixture of benzene and styrene is kept in a closed vessel at equilibrium such that both liquid and vapor phases co-exist. The total amount of moles in the vessel is 100. The total moles of benzene that is distributed in the liquid and vapor phases is 35. The ...
Sunday, November 18, 2012 at 8:36am

engineering
a bolt located 50mm from the center of an auto wheel is tightened by the couple shown for .10 seconds. determine the resulting angular velocity of the wheel if the wheel has a radius of gyration of 250 mm and a mass of 19 kilograms
Saturday, November 17, 2012 at 3:45pm

structural engineering
Fig P9 shows a drawbridge being rasied by a cable EI. The structure is a loaded truss consisting of a pinned assembly of members(links) joined at their ends designed to from a rigid structure. The four joint loadings shown result from the weight of the roadway. Calculate the ...
Saturday, November 17, 2012 at 3:55am

Engineering Statistics
what numbers did u plug in for z and x in the formula z=x-u divided by the s.d
Thursday, November 15, 2012 at 11:58pm

Chemical Reaction Engineering
The following elementary first-order reactions occur at constant density: k1 k2 A --> B --> C k1 = 5 hr-1 k2 = 4 hr-1 CA0 = 1 mol/lit CB0 = CC0 = 0 v0 = 20 m^2/min Find the maximum production rate of B in moles per minute and the optimum  for (a) a plug flow reactor...
Thursday, November 15, 2012 at 12:36pm

Physics
An advertising firm has contacted your engineering firm to create a new advertisement for a local ice-cream stand. The owner of this stand wants to add rotating solid cones (painted to look like ice-cream cones, of course) to catch the eye of travelers. Each cone will rotate ...
Tuesday, November 13, 2012 at 9:09pm

operating system
Case 2-2: Comparing Word-Processing Applications You see an opportunity to possibly save your company money by adopting the OpenOffice suite for the new PCs in the Engineering Department. Your boss is interested in your suggestion, but wants to see a list of pros and cons for ...
Sunday, November 11, 2012 at 6:24pm

engineering
how many btu's does it take to raise one pound of water at 32 degrees f to the boiling point at 14.7 psia and then to steam?
Sunday, November 11, 2012 at 4:08pm

Engineering
If you have a 300 ohm transmission line terminated with an antenna that presents a (400 ohm - j 600 ohm) load impedance: What is the normalized load admittance? (I come up with 1.5 - j 2 but am uncertain if correct) How far from the load should a short circuit stub be placed ...
Saturday, November 10, 2012 at 4:33pm

chemical reaction engineering
Propane steam reforming over an alumina supported Ni metal catalyst: C3H8 (g) + H2O (g) → CO2 (g) + H2 (g) is proposed to follow these mechanisms: C3H8 + 2S1 ↔ C2H5-S1 + CH3-S1 (M1) H2O + 2S2 ↔ OH-S2 + H-S2 (M2) CH3-S1 + OH-S2 → CH3O-S1 + H-S2 (M3) CH3O...
Tuesday, November 6, 2012 at 7:51am

Engineering Problem Solving
if a car can accelerate at 7 meters/second, what will its 0-60 mph time be?
Sunday, November 4, 2012 at 5:40pm

personal statement
this is my personal statement. plese check my grammar and what other stuff i can add or remove? thanks Ever since I was a little kid and till a year ago, I really didn’t know what I wanted to be in life. I imagined myself to be a teacher when I was 8 years old. As I grew ...
Friday, November 2, 2012 at 2:54pm

Engineering maintenance
an undamped mass spring system is with mass of 12kg and stiffness of 15N/mm,a)determine the natural frequency and the period of the free motion of the system b)determine the amplitude of displacement A and the phse shift for the initial conditions x0=2mm,v0=-1mm/s
Monday, October 29, 2012 at 2:36am

pltw
Please follow directions and type the name of your class in the appropriate box. Engineering experts will probably overlook your cryptic heading.
Tuesday, October 23, 2012 at 6:07pm

I.E.D
ITS introduction to engineering design
Tuesday, October 23, 2012 at 5:57pm

engineering
A string is fit snugly around the circumference of a spherical hot air balloon. More hot air is added (probably by a prominent scientist’s lecture) and it now takes an additional 12.4 feet of string to fit around the circumference. What is the increase in diameter?
Wednesday, October 17, 2012 at 4:43pm

CVP Analysis - Business Math
Engineering estimates show that the variable cost of manufacturing a new product will be $35 per unit. Based on market research, the selling price of the product is to be $120 per unit and variable selling expense is expected to be $15 per unit. The fixed costs applicable to ...
Tuesday, October 16, 2012 at 6:25pm

physics
plz tell me in which website can I get free engineering notes for first year B.E?
Tuesday, October 16, 2012 at 10:07am

Bachelor in Science
Bachelor's degrees usually take 4 to 5 years to complete. You'll probably need to decide which field of science -- geology, physics, engineering, chemistry, biology, physiology, etc. to specialize in.
Monday, October 8, 2012 at 7:06pm

Engineering Fund.
A large box whose mass is 19.0 kg rests on a frictionless floor. A mover pushes on the box with a force of 235 N at an angle 34.8° below the horizontal. Draw the box's free-body diagram and use it to determine the acceleration of the box. m/s2
Thursday, October 4, 2012 at 5:38pm

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