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April 19, 2014

Homework Help: Science: Engineering

Recent Homework Questions About Engineering

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electrical engineering
A three phase, four- pole, 30-hp, 220-V, 60-Hz, Y-connected induction motor draws a current of 77 A from the line source at a power factor of 0.88. At this operating condition, the motor losses are known to be the following: Stator copper losses = 1033 W Stator core losses = ...
Saturday, April 19, 2014 at 5:06pm

electrical engineering
A 3-ph., 4-pole, 60Hz induction motor is supplied by a 660-V source. At a particular loading, the total power consumed is 65KW and the current drawn from supply is 70A (assume star connection). The rotor speed is 1760rpm. The stator iron losses are 1.2KW, the windage and ...
Saturday, April 19, 2014 at 5:05pm

cost accounting
Marvin’s Motors Company (MMC) manufactures outboard motors for use on small to medium sized boats. MMC produces three models: the Standard, the Deluxe and the Performance. The company uses a normal job costing system with manufacturing overhead applied on the basis of ...
Friday, April 18, 2014 at 8:18am

engineering mathematics 1
you have 2x+y=80 and you want the maximum area, a = xy = x(80-2x) find the vertex of that parabola for max area. You will find that the fence is equally distributed among the lengths and widths. That is, 2x = 40 y = 40 so the max area pen is 20x40
Thursday, April 17, 2014 at 11:41pm

engineering mathematics 1
your father wants to fence a rectangular area in your backyard for a garden. one side of the garden is along rhe edgeof the yard is already fenced, so you only need to build a new fence along the other 3 sides of rectangle. if you have 80 meter of fencing available, what ...
Thursday, April 17, 2014 at 11:35pm

engineering
986.8*10^-9 * (1 - .5^(50/3.69*10^3)) = 9.225*10^-9 kg
Sunday, March 30, 2014 at 1:56pm

engineering
A certain amount of radioisotope (986.8 x 10-9 kg) is used to make the dial of a watch glow in the dark. If the half-life of this isotope is 3.69 x 103 years, how many kilograms of the radioisotope will disappear while the watch is in use for fifty years?
Sunday, March 30, 2014 at 1:30pm

Engineering Science
If a helical tension spring consisting of 12 live coils of ¼ inch steel wire and of 1 ¼ inch mean diameter is attached to the end of another helical tension spring of 18 live coils of ¼ inch steel wire and of 1 ¾ inch mean diameter, calculate the ...
Tuesday, March 25, 2014 at 4:16am

please check(Social studies)
please check my answers thanks 1.B 2.C 3.B 4.B 5.C and D 1.How did the haitian revolution impact the history of the united states? A.It brought the united states into a war with spain over cuba. B.France no longer had haiti,so Napeleon was willing to sell louisiana. C.Slave ...
Wednesday, March 12, 2014 at 8:04pm

life orientation
study fieldy/career of chemical engeneering,mechanical engineering,and provide two reasons for each choice
Wednesday, March 12, 2014 at 12:08pm

Finance
Wanstead Engineering Case 9 The annual bonus for senior managers at Wanstead Engineering was first agreed in 1998. Since then the company has seen no need to make any changes to the way in which the bonus is calculated. Both shareholders and managers agree the bonus is ...
Wednesday, March 12, 2014 at 12:47am

Engineering science
h = 0.5g*t^2 = 4.9*4.5^2 = 99.23 m. PE = mg*h = 6*9.8 * 99.23 = 5834 J.
Tuesday, March 11, 2014 at 4:36pm

Engineering science
A brick with a mass of 6kg is dropped vertically from a certain height.it takes 4,5 seconds for the brick to reach the ground.determine the ff.the height from which the brick is dropped and potential energy of the brick
Saturday, March 8, 2014 at 3:39pm

LECTRICAL ENGINEERING
WHAT IS THE FORMULAR FOR CALCULATING THERMAL ENERGY WHEN GIVEN CURRENT,VOLTAGE,TIME,TEMPERATURE
Thursday, March 6, 2014 at 2:08pm

engineering
What is your question?
Thursday, February 27, 2014 at 10:04pm

engineering
Building and construction A. Architecture B. Engineering C. Nursing D. Statistics
Thursday, February 27, 2014 at 8:53pm

social studies
In 1846, the population of San Francisco, California, was only 200. By 1852, the city's population was 36,000. Which contributed the most to San Francisco's population change? (5 points) The Gold Rush The Mexican-American War The Monroe Doctrine The Trail of Tears 2. ...
Tuesday, February 25, 2014 at 7:04pm

social studies
In 1846, the population of San Francisco, California, was only 200. By 1852, the city's population was 36,000. Which contributed the most to San Francisco's population change?  (5 points) The Gold Rush The Mexican-American War The Monroe Doctrine The Trail ...
Sunday, February 23, 2014 at 6:14pm

physical since,pure maths,life science
wt cn i become? except all de engineering thngs?plz help
Sunday, February 23, 2014 at 5:20am

tech
Why is drawing important to Technology and Engineering?
Thursday, February 20, 2014 at 6:08pm

engineering
. A platform with boat weighs 10,000 N. Four cables are attached to the platform as shown; the edges of the platform are always a horizontal distance of 2 m from the pulleys. As the platform rises smoothly and evenly, the length L of the cables decreases and the angle θ ...
Monday, February 17, 2014 at 3:40am

careers
Universities in India from where jobs from abroad will be offered to students after completing B.Tech in aeronautical engineering.
Wednesday, February 12, 2014 at 11:16pm

Science~!
This is out of my field but I think turbines is the right answer. I have done some geothermal work (the chemistry of it and not the engineering part) and in all cases the pressure was to run turbines which in turn generated electricity. Water and wind also run turbines to ...
Tuesday, February 11, 2014 at 3:48pm

Science
Associate each item in the table with at least one field of science and one area of technology/engineering. Choose from the terms given at the bottom. Automobile aspirin shirt computer pesticide satellite robot atomic bomb vaccination can of soup polyester wrapper skyscraper ...
Tuesday, February 11, 2014 at 1:00am

Engineering science N4
Distance = Vo^2*sin(2A)/g = 12000 m 700^2*sin(2A)/9.8 = 12000 50000*sin(2A) = 12000 sin(2A) = 12000/50000 = 0.240 2A = 13.9o A = 6.94o
Friday, January 31, 2014 at 9:40pm

Engineering
Microprocessing chips are randomly sampled one by one from a large population, and tested to determine if they are acceptable for a certain application. Ninety percent of the chips in the population are acceptable.
Thursday, January 30, 2014 at 1:44pm

Engineering science N4
Calculate the angle of projection of a projectile in order to hit a target 12km away.the initial velocity is 700m/s ant the time of the flight is 80seconds.
Thursday, January 30, 2014 at 4:57am

Engineering science N4
A ship is 100km north-west of cape town harbour and it sails directly north at a velocity of 30km/h in 8 hours.calculate its resultant speed with reference to the cape town harbour in magnitude and direction.
Thursday, January 30, 2014 at 4:52am

Engineering Math
i need this answer if any one know it please
Monday, January 27, 2014 at 7:57pm

Engineering science
V=u+at 20=0+9.8t
Monday, January 27, 2014 at 12:42pm

Engineering science
V=u+at 20=0+9.8t
Monday, January 27, 2014 at 12:42pm

Accounting, TAX
Which of the following entities may not use the cash method of accounting? A partnership with average annual gross receipts in excess of $5 million. A C corporation whose average annual gross receipts for the preceding 3 taxable years do not exceed $5 million. A C corporation ...
Saturday, January 25, 2014 at 8:28pm

materials science engineering
Identify the [221] vector.(crystallographic directions qns) The answer given corresponds to 0.5 in x direction,0.5 in y and 1 in z. Why is it not [1 1 0.5], the simply reduced form. The ans is the reciprocal of [221], which puzzles me since this is not a plane.
Saturday, January 25, 2014 at 1:50am

english
You've been assigned to invite a group of mechanical engineering professors to tour your facility. What type of language should you use in the invitation? A Formal language B Direct, simple language C Technical jargon D Pompous language
Thursday, January 23, 2014 at 10:02pm

soicalstudies(CHECK ANSWERS) 10Qs
please check them ! 1. The Aztecs adapted to their environment mainly by A.using terracing and irrigation to farm. B.living a nomadic hunter-gatherer lifestyle. C.trading peacefully with neighbors. D.settling along the coasts where they could fish.(I PICK THIS) 2. Why did ...
Thursday, January 23, 2014 at 3:04pm

intro to computers
what type of device is characteristic of an enterprise environment? a workstation used by a retired person. a workstation used at an engineering firm. a tablet computer used by an elementary school student a notebook used by a college student
Tuesday, January 21, 2014 at 6:33pm

Environmental Engineering
The EPA requires hazardous waste incinerators to meet a standard of 99.99% destruction and removal of hazardous constituents injected into the incinerator. Determine the allowable quantity of contaminant in the exit stream if the incinerator is burning 1.0000 g/s of hazardous ...
Wednesday, January 15, 2014 at 3:35pm

Python programming Language
Hello, plz hav bin lookin for an answer to dis question too.. Am a student studying software engineering in india, plz mail me if you got any answer plz forward to cooproton@gmail .. Thanx, I'ld really appreciate it
Thursday, January 2, 2014 at 4:54pm

linear optimization
During a summer session a student enrolls in two courses, psychology for four hours and engineering for three hours. The student wants to use the available time to amass the largest number of grade points (numerical grade multiplied by the number of hours). Students who have ...
Sunday, December 29, 2013 at 10:45am

Engineering
plz... post all the answers you know so that other people will be benefited.....
Monday, December 23, 2013 at 9:37am

engineering
No idea. But i want to know. Does anyone have an idea??
Saturday, December 21, 2013 at 4:43am

Engineering
Guys, I would be glad if you post the answer for this questions. Thank you so much.!
Saturday, December 21, 2013 at 2:56am

Engineering
What is the answer for b and c? Please Help.
Friday, December 20, 2013 at 2:14am

engineering
In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the ...
Thursday, December 19, 2013 at 9:42pm

engineering
The flow system as shown in the Figure, the centrifugal pump(3500 R.P.M.) is delivering water at 100 gal/min and 70 °F into a boiler operating at a pressure of 35 psig. The water levels in the feed tank and boiler are constant. Because corrosion is expected to be ...
Wednesday, December 18, 2013 at 12:04pm

Engineering
Thank you. I can find it now. But can you tell me how to do 2d,e , please?
Wednesday, December 18, 2013 at 11:09am

Engineering
yes, I know...but I don't know how to find n and eta? can you teach me how to find it?
Wednesday, December 18, 2013 at 10:23am

engineering
The flow system as shown in the Figure, the centrifugal pump(3500 R.P.M.) is delivering water at 100 gal/min and 70 °F into a boiler operating at a pressure of 35 psig. The water levels in the feed tank and boiler are constant. Because corrosion is expected to be ...
Wednesday, December 18, 2013 at 10:06am

Batteries - Engineering
Here we consider instead dissolving guns (which we will assume are pure iron) with sulfuric acid. Fe+H2SO4->FeSO4+H2 It is apparent that they must use an outside source of electrical power to drive the dissolution of the iron. They use a small current so that the ...
Wednesday, December 18, 2013 at 2:33am

Solar Energy - Engineering
In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the ...
Wednesday, December 18, 2013 at 2:30am

Math-Algebra
(Engineering) The current / varies as the electromotive force E and inversely as the resistance R. If in a system, a current of 20A flows through a resistance of 20 ohms with an electromotive force of 100V, find the currect that 150V will send throu+gh the system. (Navigation...
Wednesday, December 18, 2013 at 1:55am

Engineering
for b you use Butler Volmer equation and for c you use eq: I=n*F*dH2/dt
Tuesday, December 17, 2013 at 3:29pm

system design
This sounds like a nice engineering project. Do you have any questions about it?
Tuesday, December 17, 2013 at 10:16am

Engineering
how are about b,c? can you calculate it?
Tuesday, December 17, 2013 at 7:59am

Engineering
1 - 1.23v
Tuesday, December 17, 2013 at 6:22am

Engineering
In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the ...
Sunday, December 15, 2013 at 10:31am

Engineering
Here we consider instead dissolving guns (which we will assume are pure iron) with sulfuric acid. Fe+H2SO4->FeSO4+H2 The characters realize that their hideout has been discovered by the police and they still have a last handgun that weighs 0.25 kg to dissolve. The cops will...
Sunday, December 15, 2013 at 10:28am

Engineering
Here we consider instead dissolving guns (which we will assume are pure iron) with sulfuric acid. Fe+H2SO4->FeSO4+H2 It is apparent that they must use an outside source of electrical power to drive the dissolution of the iron. They use a small current so that the ...
Sunday, December 15, 2013 at 10:25am

statistic
Sometimes we can answer specific questions if a math or engineering or economics or science teacher is around who does statistics.
Friday, December 13, 2013 at 9:44pm

science(please check answers)
Identify the choice that best completes the statement or answers the question. 1.Studies conducted in England during the Industrial Revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely ...
Wednesday, December 4, 2013 at 11:57am

engineering
A saturated soil sample under CU test was subjected to a confining pressure of 200 kPa with back pressure (pore pressure) of 50 kPa. What would be the value of pore pressure if the confining pressure was raised to 400 kPa without drainage? If the pore pressure parameter A is 0...
Wednesday, December 4, 2013 at 2:05am

Science SCI 207
Question : Which of the following is an environmental concern of genetically engineered crops mentioned in your text? Student Answer: Genetically modified crops lead to larger applications of toxic herbicides and insecticides. The genetic modification of crops increases soil ...
Monday, December 2, 2013 at 1:50pm

engineering
In a Direct Shear Test please help. 1)How do we determine the spacing between the two parts of shear box? What would happen if it is not set properly? 2) The shear and normal stress can be calculated with the corrected area considering the movement of displacement. How would ...
Sunday, December 1, 2013 at 11:30pm

engineering
can you give us the solution
Sunday, December 1, 2013 at 11:18am

Electrical Engineering
answer please
Saturday, November 30, 2013 at 12:14pm

Electrical Engineering
Winter is coming, so I want to make a 1500 W heating coil which will plug into a 120 V wall outlet. The coil will have a cross sectional area of 0.01 cm2 and a length (when fully unwound) of 5 m. Determine the resistivity of the coil required, in Ωcm:
Friday, November 29, 2013 at 11:07am

Science
Scientists have inserted the gene for human insulin into bacteria. These bacteria make the insulin protein, which can then be used by people who have diabetes. This process is an example of -hybridization -gene therapy -selective breeding -genetic engineering my answer is D
Thursday, November 21, 2013 at 12:56pm

English
Which words go in the following sentences. Young Charles was born in 1902 and was growing/grew up on a farm. Later, although he has studied/had studied engineering in college, he was more interested in flying planes.
Monday, November 18, 2013 at 4:39pm

civil engineering
For a soil with significant secondary compression, if the duration of each loading increments is lengthened to a few days, what would be the effects on the void ratio vs. Log p curve and the preconsolidation pressure?
Monday, November 18, 2013 at 7:22am

Electrical Engineering
anyone ?
Wednesday, November 6, 2013 at 11:53pm

Anyone wanna help me with this math?
Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Studies conducted in England during the Industrial Revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The ...
Saturday, November 2, 2013 at 2:42am

question
At one time the university where I taught had a honors chemistry class taught in freshman class of college(not high school) and it was open to students who scored above a certain level on a test we gave the first day of class to everyone enrolled in freshman chemistry. Those ...
Friday, November 1, 2013 at 11:21pm

Electrical Engineering
Find the latitude at Stanford University using Google Maps to the nearest degree (This is how you do it) and calculate the Air Mass Factor on the autumnal equinox (when the center of the sun is in the same plane as the equator of the earth) at noon (when the sun is directly ...
Friday, November 1, 2013 at 1:02am

Engineering
give us solution please?
Friday, November 1, 2013 at 1:01am

Engineering
At 300 K we see the electron concentration in the conduction band for pure (undoped) Si is 1010/cm3. How many electrons per Si atom is this? You can use scientific notation, as in A.AAeB Si is diamond cubic with 8 Si atoms per unit cell and a lattice parameter of 0.543 nm.
Friday, November 1, 2013 at 1:00am

engineering
A compartment measures 3 meters by 5 meters and is 2.8 meters high. A fire raises the temperature from 20oC to 1000 oC. If the starting pressure was 1 atmosphere, what pressure is present at the elevated temperature assuming the compartment remains closed?
Wednesday, October 23, 2013 at 10:49am

engineering
What is the change in enthalpy for an isothermal, isentropic compression of an ideal gas from 2 atm to 12 atm?
Wednesday, October 23, 2013 at 1:23am

World History
Ahh. Thank you for clarifying this. People in a complex society make their livings by farming as priests making art producing consumer goods constructing buildings maintaining water and sewer lines engineering and maintaining streets and roads
Tuesday, October 22, 2013 at 6:41pm

Report (Writeacher or Ms. Sue)
Does my report require any editing? "Incorporated as a city in 1837, Chicago has experienced great changes, rapid growth, and an immense amount of industrialization since the time of its original creation. From once being inhabited merely by a Native American tribe known ...
Monday, October 21, 2013 at 8:56pm

Geography Report (Ms. Sue)
Incorporated as a city in 1837, Chicago has experienced great changes, rapid growth, and an immense amount of industrialization since the time of its original creation. From once being inhabited merely by a Native American tribe known as the Potawatomi to being populated by 12...
Monday, October 21, 2013 at 7:35pm

Geography Report (Ms. Sue)
Therefore, to summarize this report, the city of Chicago, located in northeastern Illinois in the Great Lakes Region, has become a highly industrialized city, possessing a large population and moderate climate as well as filled with marvelous tourist attractions, extraordinary...
Monday, October 21, 2013 at 7:22pm

Geography Report (Ms. Sue)
This is what I have written for the conclusion paragraph so far. "Therefore, to summarize this report, the city of Chicago, located in northeastern Illinois in the Great Lakes Region, has become a highly industrialized city, possessing a large population and miserable ...
Monday, October 21, 2013 at 7:07pm

Geography Report (Ms. Sue)
This is what I have written so far. Do you suggest any improvements? Location: Chicago's absolute location is about 42 degrees North latitude and 87 degrees West longitude. It is located upon the southwestern shore of Lake Michigan in the northeastern part of Illinois. ...
Monday, October 21, 2013 at 5:01pm

Geography Report (Ms. Sue)
This is the human-environment interaction paragraph. "There are many examples of human-environment interaction in the city of Chicago, such as its architecture, dams, bridges, and its highways. However, what it is believed to the most astonishing display of human-...
Sunday, October 20, 2013 at 11:00pm

Geography Report (Ms. Sue)
There are many examples of human-environment interaction in the city of Chicago, such as its architecture, dams, bridges, and its highways. However, what it is believed to the most astonishing display of human-environment interaction is the Chicago River—the river that ...
Sunday, October 20, 2013 at 10:59pm

Introduction to computers
What type of device is characteristic environment? a. a workstation used by a retired person b.a workstation usedat an engineering firm c.a tablet computer used by an elementary school student d. a notebook used by a college student
Thursday, October 17, 2013 at 6:53pm

school of engineering
distance=1/2 a *8^2 + speed(T-8-18) change a, and speed to m/s T=42 sec
Thursday, October 17, 2013 at 4:25pm

school of engineering
police officer in a patrol car parked in a70km/h observes a passing auto mobile travelling at a slow constant speed believing that of the automobile might be intoxicated the officer starts his car accelerate uniformly to 9km/h in 8s.and maintaining a constant velocity of 90km/...
Thursday, October 17, 2013 at 4:06pm

school of engineering
A train of mass 200 tonne travelling at 140 km/hour applies the brakes fiercely, so that the brakes lock and the wheels slide along the rails. It stops after sliding 1000m. Calculate: (i) The acceleration, (ii) The longitudinal force on the rails, (iii) The coefficient of ...
Wednesday, October 16, 2013 at 11:20am

school of engineering
A train of mass 200 tonne travelling at 140 km/h applies the brakes fiercely , so that the brakes lock and the wheels slides along the rails.it stops sliding 1000m. calculate. 1. The acceleration. 2. The longitudinal force on the rail. 3. The coefficient of friction between ...
Wednesday, October 16, 2013 at 10:43am

school of engineering
i. Acceleration is the change in velocity over time. a = (v,f - v,o) / t where v,f and v,o are the final and initial velocities respectively, and t is the time. Substituting, a = (100 - 50 km/h)*(1000 m / 1 km)*(1 h / 3600 s) / 10 s a = 1.39 m/s^2 ii. Since the motion is ...
Tuesday, October 15, 2013 at 7:12am

school of engineering
A train of mass 200 tonne travelling at 140 km/h applies the brakes fiercely , so that the brakes lock and the wheels slides along the rails.it stops sliding 1000m. calculate. 1. The acceleration. 2. The longitudinal force on the rail. 3. The coefficient of friction between ...
Tuesday, October 15, 2013 at 7:08am

school of engineering
a motor of mass 1500 kg accelerates from 50 km/h to 100 km/h in 10 seconds.calculate. (i)The acceleration in metre/second2. (ii)The distance travelled. (iii)The force on the vehicle.
Tuesday, October 15, 2013 at 6:59am

chemistry
The use of the British thermal unit (Btu {\rm Btu}) is common in much engineering work. (1 Btu {\rm Btu} = 1054J {\rm J}) A Btu {\rm Btu} is the amount of heat required to raise the temperature of 1 lb {\rm lb} of water by 1 ∘ F ^\circ {\rm F}. How many quads of energy ...
Monday, October 7, 2013 at 11:31pm

engineering (logic systems design)
Two flip-flops are connected as shown below. The delay represents wiring delay between the two clock inputs, which results in clock skew. This can cause possible loss of synchronization. The flip-flop propagation delay from clock to Q is 10 ns < tp < 15 ns, the set-up ...
Thursday, October 3, 2013 at 2:50pm

engineering mechanics
14 degrees
Tuesday, October 1, 2013 at 1:36pm

engineering mechanics
14 degrees
Tuesday, October 1, 2013 at 1:36pm

Engineering
What is the critical buckling force that will buckle a 9 foot tall 2 x 4 (K = 1.0)? Please show how to set up the problem and the steps to solve. I do not understand. Thank you.
Sunday, September 29, 2013 at 11:46am

physics
Outside the battery, electrons do flow from negative (cathode) to positive (anode). Why? The chemicals attached to the anode will need (gain) electrons when the circuit is completed, those electrons then assist the chemical reaction. At the negative terminal, inside the ...
Thursday, September 26, 2013 at 11:06am

chemisry
What are the specializations of sanitary engineering? Drinking water supply Sewage Wastewater treatment 2) Name the different parts of the drinking water supply system? Production Storage Distribution 3) Which of the following three systems can be discerned when producing ...
Tuesday, September 24, 2013 at 11:55am

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