Tuesday

September 1, 2015
**Engineering Physics**

You want to use a spring (k=100 N/m) to send a 500-g mass up a frictionless incline (30 degree to horizontal) to arrive at a platform 3m above the ground. How far should you compress the spring?
*Sunday, July 1, 2012 by John*

**Engineering Science**

A bullet with a mass of 28g and travelling at 300m\s strikes a body with a mass of 14kg and which can move freely. The bullet remains in the body. At What velocity will the body start to move?
*Thursday, June 28, 2012 by Jan Vosloo*

**Essay:)**

Topic: Compare and Contrast the Tang and song dynasties China? The Tang Dynasties (June 18,618-June 4,907)was an imperial dynasty of china preceded by the Sui Dynasty and followed by the Five Dynasties Ten Kingdoms period. It was founded by the cifamily. In chinese history, ...
*Wednesday, June 13, 2012 by Ciara*

**Art**

Could you please check if everything is correct? Thank you. 1) In 1986, Eric Drexler published “Engines of Creation”, a scientific dissemination in which shows not only the theoretical bases of nanotechnology, but also a series of speculation about the possible ...
*Monday, June 11, 2012 by John*

**Art**

Could you please check scientific English in this short dissertation? Thank you, Ms. Sue. 1) Conrad Waddington introduced the term epigenetics in the early 1940s. He defined epigenetics as ‘‘the branch of biology which studies the causal interactions between genes ...
*Thursday, June 7, 2012 by Mike*

**engineering material**

1. Explain the difference between ‘eutectic’ and ‘eutectoid’. 2. Explain the terms ‘hyper-‐ and hypoeutectoin ’and ‘hyper-‐ and hypoeutectic
*Monday, May 28, 2012 by khairul*

**Engineering science**

A stone is thrown down a well at a velocity of 20m/s. If the well is 20m deep, calculate the time taken for the stone to reach the bottom of the well.
*Sunday, May 27, 2012 by Leonel*

**Science**

Here are the other sentences on the same theme I urgently need you to check. I hope you can help me. Thank you. 1) The existence of complex molecular structures present in every living system is used by Drexler to show the theoretical possibility of the design and construction...
*Friday, May 25, 2012 by Frank*

**english**

I wrote an essay because i'm apply to get into the honor's program. I'm supposed to write about who i was, who i am now, and who I would like to be. I would appreciate it if I got some feed back along with grammar correction. Is my essay even close to being okay or...
*Tuesday, May 22, 2012 by jennifer*

**ethic**

Contrast utilitarian and deontological approaches to a dilemma involving genetic engineering.
*Sunday, May 20, 2012 by ant*

**Desktop publishing-Elements of Design**

Well i took this test and failed. This is the last test and i graduate. I posted [my answers] to the ones i think are right. 1. Study the following sentence, then select the answer that best describes it. THE COW JUMPS OVER THE MOON! A. Italic serifed type B. Bold roman sans ...
*Sunday, April 29, 2012 by Caralynn93*

**Engineering Calculus**

f(x)=((6x-3)/(x+6)) how do you find the intervals of decreasing and increasing...I found that there were no critical points yet I was also correct that the function increased (-I,-6) and (-6,I). I was wrong that there were no decreasing intervals though.
*Saturday, April 28, 2012 by Cheallaigh*

**computer network engineering**

a steel ball weighing 128 lb is suspended from a spring, whereupon the spring is stretched 2 ft from its natural length. the ball is started in motion with no initial velocity by displacing it 6 in above the equilibrium position. assuming no damping force, find an expression ...
*Sunday, April 22, 2012 by anisah*

**engineering science**

a bale of weight 200 newtons hanged at the end of a rope.find the acceleration of the bale if the tension in the rope is 200 newtons,150 newtons,300 newtons.
*Tuesday, April 17, 2012 by aaron*

**engineering science**

The spherical side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the mirror. If the height of the car is 1.6 m, how tall is its image?
*Monday, April 16, 2012 by lindiwe*

**Engineering**

What is the upper tripper point (UTP) of a comparator with hysteresis if R1 = 47 kÙ, R2 = 68 kÙ and the maximum positive output voltage is 10V?
*Monday, April 9, 2012 by Robbie*

**Engineering**

A certain OTA with a transconductance of 5000 µS has a load resistance of 10 kÙ. If the input voltage is 100 mV, what is the output current? What is the output voltage?
*Thursday, April 5, 2012 by Bruce*

**engineering mechanics**

A car is travelling on a banked circular racetrack, Given that the track is banked at an angle of 16degree to the horizontal and the radius of the track is 50 metres and there are no friction forces present a) draw a free body diagram of the car b)calculate the linear velocity...
*Thursday, April 5, 2012 by dmkp*

**engineering mechanics**

An exercise bicycle's flywheel is 30cm in diameter and 2.5 cm thick and is constructed from steel (density=7850 kg m3) its moment of inertia is 0.156 kg m2 about its axis of rotation a) calculate the mass of the flywheel b) calculate the flywheel's radius of gyration c...
*Thursday, April 5, 2012 by dmkp*

**engineering mechanics**

An exercise bicycle's flywheel is 30cm in diameter and 2.5 cm thick and is constructed from steel (density=7850 kg m3) its moment of inertia is 0.156 kg m2 about its axis of rotation a) calculate the mass of the flywheel b) calculate the flywheel's radius of gyration c...
*Wednesday, April 4, 2012 by dmkp*

**engineering mechanics**

A car is travelling on a banked circular racetrack, Given that the track is banked at an angle of 16degree to the horizontal and the radius of the track is 50 metres and there are no friction forces present a) draw a free body diagram of the car b)calculate the linear ...
*Wednesday, April 4, 2012 by dmkp*

**Finance (Engineering Economics)**

You wish to retire at 60 and, at the end of each month thereafter for 25 years, to receive $6,000. Assume that you begin making monthly payments into an account at age 23 and continue these payments until age 60. If the annual interest rate is constant at 12 percent, how much ...
*Wednesday, April 4, 2012 by Chase*

**engineering**

Why people need to be engineering
*Tuesday, April 3, 2012 by Anonymous*

**computer science**

You have been working for the XYZ Computer Corporation as an entry-level software engineering since you graduated from college last May. You have done very well so far; you are respected by management, well liked by your fellow employees , and have been assigned to a team of ...
*Thursday, March 29, 2012 by Enid*

**English**

Writeacher, I need your help to check a few things. Thank you. 1) At the first time Clare didn't say if she was free, but the next day she confirmed she was able to go to the cinema. (Can you check this sentence for me?) 2) I would like to enrol at the faculty of ...
*Thursday, March 22, 2012 by Matthew*

**nutrition**

Making a transceiver from sccrtah is a pretty awesome project. It can take a while, though.There's a lot of theory of operation that factors in physics and engineering.I'm a radio technician, so I'm biased, but if I were a science teacher I would be amazed if ...
*Wednesday, March 21, 2012 by YHlFMKuHz*

**English**

As Writeacher is on holiday, I need someone of you, Ms Sue, to check my paragraph. In particular, sentence 1 (?) "he had daydreamed" and sentence 2 (the whole sentence). I really hope you can help me. 1)In Chapter ten Dr Jekyll comes to the realization of the ...
*Monday, March 19, 2012 by Matthew*

**English**

Ms Sue, here is the second and last part, concerning Stevenson's biography. Thank you very much for helping me. 1) Robert Louis Stevenson was born in Edinburgh in 1850. He spent most of his childhood in bed because of his poor health and grew up under the influence of his ...
*Sunday, March 18, 2012 by Matthew*

**Engineering Science (Physics)**

A platinum coil has a resistance of 3.146(ohms) at 40'C and 3.767(ohms) at 100'C. Find the resistance and the temperature coefficient of resistance at 0'C. Thanks in anticipation
*Wednesday, March 14, 2012 by Xyler*

**health informatics**

how is emerging technology influencing healthcare? and give an example. all what i know is that they are basiclly new technologies and my example is about tissue engineering but the problem is that i don't know how it influences the healthcare!!! so please please your ...
*Saturday, March 3, 2012 by lenny*

**engineering**

in a hydralic jack 1:5 ratio piston diameter,and we apply a fofce of 25kg,what can it lift.
*Tuesday, February 28, 2012 by Anonymous*

**engineering**

A steady, two-dimensional velocity field is given by V = (u, v) = (1.35 + 2.78x - 0.896y)i + (3.45x + cx - 2.78y)j Calculate constant c such that the flow field is irrotational.
*Monday, February 27, 2012 by Angel*

**MATH**

THE HOSTEL OF AN ENGINEERING INSTITUTE HAS 320 STUDENTS AND THE FOOD STOCK FOR 80 DAYS. IF 20 STUDENTS LEAVE THE HOSTEL AFTER 20 DAYS,FOR HOW MANY MORE DAYS WILL THE FOOD LAST?
*Sunday, February 26, 2012 by RAVI*

**engineering**

Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is the volume of each atom...
*Sunday, February 19, 2012 by ali*

**Math, mathematics of finance**

I am stuck on these two math questions. If nyone could help me solve them it would be greatly appreciated! Here is the information: Engineering estimates indicate that the variable cost of manufacturing a new product will be $35 per unit.Based on market research, the selling ...
*Saturday, February 18, 2012 by Zoey*

**Science/English**

Writeacher, now that the grammar is OK, I just want to know if everything is correct from a scientific point of view. Could you please ask your science teacher, Bob Pursley? 1) After meeting with the engineer ......... we became interested in exploring the problems of water ...
*Wednesday, February 15, 2012 by Henry2*

**English**

I tried to reduce the sentences myself though I think you still need to revise it. Thank you very much. 1) We decided to create an effective and inexpensive filter using knowledge of genetic engineering. 2) In particular, we prepared (have prepared)a genetically modified ...
*Wednesday, February 15, 2012 by Henry2*

**English**

Here is a presentation entitled "treatment plant from arsenic and pathogenic bacteria". I don't know how to check it as I'm not familiar with the content. I'd like you to help me check the grammar. The paragraph contain long-winded sentences with no ...
*Wednesday, February 15, 2012 by Henry2*

**Chemistry/Engineering**

A 25 gram sample of CT is vaporized and used to fill a 5 L container. If the pressure in the container is 1.2 atm at 27 degrees Celsius, what is the molecular weight of CT in grams per mole? I used PV=nRT and found n=.2437 mol, but how do I got to grams per mole? CT is a made-...
*Tuesday, February 14, 2012 by Becca*

**Engineering **

The angular velocity of a rigid body rotating about an axis of rotation is w = 5^i + 2^j - 4^k rad. per. sec. Determine the linear velocity of point B on the body with a position vector r = 3^i - ^j + 3^k ft. directed from a point on the axis of rotation. Would the solution ...
*Sunday, February 12, 2012 by Aaron*

**Engineering/Physics**

A force F = 7^i + 6^j - 5^k lb. acts at the origin. Find the magnitude and direction cosines of the moment of this force about point A (-4; 5; 6) ft So in this case wouldn't vector r= -4i +5j +6k and vector F = 7i + 6j - 5k lb? and r X F = -61i +22j -59k = MA [MA]= 87.67 ...
*Sunday, February 12, 2012 by Aaron*

**Engineering **

A force of 26 lb. acts through a point (4; 5; -7) ft. and is equally inclined to the positive ends of the orthogonal axes. What is the moment of this force about the origin So i'm assuming vector r is 4i+5j-7k? And using the fact that cos^2α + cos^2β + cos^2γ...
*Sunday, February 12, 2012 by Aaron*

**Engineering**

Calculate the moment about a point (5; 4; 3) ft. caused by the forces P = 3^i - 2^j - 4^k lb. and Q = 5^i + 7^j - 2^k lb. acting at the points (7; 2; -2) ft. and (-3; -2; 5) ft., respectively. What I did was this; vector r1= (7,2,2) - (5,4,3) = 2i-2j-5k vector r2= (3,2,5) - (...
*Saturday, February 11, 2012 by Aaron*

**Engineering**

Calculate the moment about a point (5; 4; 3) ft. caused by the forces P = 3^i - 2^j - 4^k lb. and Q = 5^i + 7^j - 2^k lb. acting at the points (7; 2; -2) ft. and (-3; -2; 5) ft., respectively. What I did was this; vector r1= (7,2,2) - (5,4,3) = 2i-2j-5k vector r2= (3,2,5) - (...
*Saturday, February 11, 2012 by Aaron*

**Physics/ Engineering**

Calculate the moment about a point (5; 4; 3) ft. caused by the forces P = 3^i - 2^j - 4^k lb. and Q = 5^i + 7^j - 2^k lb. acting at the points (7; 2; 2) ft. and (3; 2; 5) ft., respectively. What I did was this; vector r1= (7,2,2) - (5,4,3) = 2i-2j-5k vector r2= (3,2,5) - (5,4,...
*Saturday, February 11, 2012 by Aaron*

**ENGINEERING**

100 lb of loose gravel can fill a 1-ft^3 box. Its specific gravity is 2.68. What is the dry rodded weight? Find the volume of voids in the preceding problem.
*Friday, February 10, 2012 by GSU*

**engineering science**

a boat can sail at 27 m.s in still water. the boat must cross a river that flows at 9 m.s towards the east . if the boat crosses the river by going up stream at an angle of 23 south, what will the size and angle of the resulting velocity be?
*Thursday, February 9, 2012 by Zane*

**elements of design**

1. Study the following sentence, then select the answer that best describes it. THE COW JUMPS OVER THE MOON! A. Italic serifed type B. Bold roman sans serif type C. Bold italic sans serif type(my answer) D. Bold roman serifed type 2. Which one of the following statements about...
*Tuesday, February 7, 2012 by Samantha*

**English**

Here is the second part of the school description I need to translate. Some words are unclear and the sentences are too wordy. I need your help to improve them. 1) third branch includes the study of two foreign languages: English and French and addresses to all those who wish ...
*Monday, February 6, 2012 by Henry2*

**electrical engineering**

Input range: -100mV to +60mV Voltage supplies to the op-amp= ±15V how do we find the input offset voltage?
*Friday, February 3, 2012 by eng*

**Engineering/Chemistry**

Milk is flowing through a heat exchanger at a rate of 2000kg/h. he heat exchanger supplies 111,600kJ/h. The outlet temperature of the product is 95C. Determine the inlet temperature of the milk. The product specific heat is 3.9kJ/(kg*C)
*Tuesday, January 31, 2012 by Janice*

**engineering science**

If a person has a mass of 83 kg, what will that person weigh in newton
*Tuesday, January 31, 2012 by kabelo*

**engineering science**

A 250 cc motorbike must accelerate from rest to 126 km/h in 150 m in 10 seconds. Draw a velocity/time graph of the movement. (Hint: change km/h to m/s
*Tuesday, January 31, 2012 by kabelo*

**engineering**

an airplane was moving with a velocity equal to 300 mph when the velocity was increased with uniform acceleration to 600 mph in 5 min. calculate the number of miles the airplane traveled during that interval of time
*Sunday, January 29, 2012 by Anonymous*

**mechanical engineering**

A railroad car that weighs 20,000 lb is traveling eastward with a velocity whose magnitude is 5fps. A second car, on the same track, that weighs 40,000 lbs also traveling in an easterly direction with a velocity of 7.8fps. When the cars collided, they became coupled together ...
*Sunday, January 29, 2012 by Anonymous*

**basic engineering electricity**

At what current drain does the ampere-hour Energizer d cell drop to 75% of its value at 25mA?
*Sunday, January 29, 2012 by kali*

**industrial electronics N2**

Hi, i'm seriously need your help on this subject just to explain the basics, chapter by chapter. i registered a part-time Electrical Engineering and placed me in N2.
*Thursday, January 19, 2012 by emmanuel*

**Engineering/physics **

Calculate the moment if you were to hold a 15lb bowling ball with your arm straight out and your forearm perpendicular to your body. What is the pinnned connection
*Wednesday, January 18, 2012 by r.khepra *

**SOFTWARE ENGINEERING**

Draw an E-R diagram its related tables showing its integrity constraints.
*Wednesday, January 11, 2012 by Kavya Tank*

**Thermodynamics**

Determine the units of viscosity,m, in the following equation: t=m(du/dy), where t is a shear stress, u a velocity, and y is a distance in (a) the Engineering English system, and (b) the SI system.
*Wednesday, January 4, 2012 by Jack*

**computer engineering**

what is optical fiber cable?
*Sunday, December 11, 2011 by MUHAMMAD UMAR*

**math engineering**

) ∫_(-1)^2 ∫_0^6▒〖x² sin(x-y)dxdy= 〗 ∫_0^6 ∫_(-1)^2▒〖x^2 sin(x-y)dydx〗 determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an ...
*Saturday, December 10, 2011 by syakila*

**environmental engineering /hydrology**

estimate the volume of water that will infiltrate into a soil before surface saturation occurs using the Green-Ampt equation.The following data are known ; 1-saturated moisture content is 0.25 2-the initial moisture content is 0(zero) 3-the average rainfall rating is 2 in./hr ...
*Tuesday, December 6, 2011 by aysegul*

**statistics**

An engineering company believes it has developed a faster way to complete the assembly of an industrial machine. The present process takes an average of 6.5 hours to complete and the times it takes to complete the process are approximately normally distributed. If the mean ...
*Tuesday, November 29, 2011 by amy*

**Physics/Engineering**

1. The problem statement, all variables and given/known data I am using a Vishay strain indicator with it hooked up to a strain gage hooked up 1" away from the wall on the solid beam. The beam is .5" by .5", and it is solid. The beam is 16" long and I am ...
*Thursday, November 17, 2011 by Z32*

**Engineering**

A 2kg piece of gold metal at 90 C is placed in 5 liters (=5kg) of water at 30 C. Determine the final temperature (Tf).
*Wednesday, November 16, 2011 by Devin*

**Materials Engineering**

Can someone please tell me what material is used for the an electric window switch (the part that the driver presses)?
*Tuesday, November 8, 2011 by Claire*

**engineering**

Problem 1: A long embankment is located on a soil profile consisting of 4m of medium clay followed by 8m of medium to dense sand on top of bedrock. A vertical settlement of 5mm at the center of the embankment was measured during construction. Assuming all the settlement is ...
*Sunday, November 6, 2011 by Can someone help me please? *

**engineering**

I need help in my homework concerning Fire Science Engineering. Acetone is released into the diked area surrounding its storage tank. The dike measures 40 feet long by 30 feet wide. What heat is the Heat Release Rate should it catch on fire? This help will be appreciated. Thanks.
*Saturday, November 5, 2011 by Deborah*

**engineering**

I need help with homework in Fire Engineering. What flame height would result from a 3 megawatt fire located in the corner of a compartment? This help will be appreciated. Thanks.
*Friday, November 4, 2011 by Deborah*

**engineering**

I need help with my Fire Engineering homework. What is the heat release rate of a flame measuring five feet in height assuming the flame is in the center of a room?
*Friday, November 4, 2011 by Deborah*

**math**

R. C. Droid has developed a new computer. He calls it the Droid computer. Mr. Droid has virtually every aspect of his new company well underway except for his sales force. He has not yet hired any salespeople to sell the Droid computer. Mr. Droid believes that any person with ...
*Friday, November 4, 2011 by Anonymous*

**engineering**

I need help with a Fire Science Engineering homework. A fuel has heat of combustion equal to 30 kj/g. How much energy is released when 5 kilograms are oxidized? Assuming the fuel is reacted in 10 minutes, what is the average heat release rate for the fire? This will be greatly...
*Wednesday, November 2, 2011 by Deborah*

**Engineering**

-From the following two linear homogeneous algebraic equations:(sqr= square root) (1) B*sin(kl/sqr2) = D*sin(kl) (2) (k/sqr2)*B*cos(kl/sqr2) = (k)*D*cos(kl) -Form matrix of these 2 equations and solving the determinant=0 will lead to: (1/sqr2)*cos(kl/sqr2)*sin(kl) - sin(kl/...
*Sunday, October 30, 2011 by Chris*

**engineering**

I am studying Fire Science Engineering. I have a question concerning my homework. The question is A compartment measures 3 meters by 5 meters and is 2.8 meters high. A fire raises the temperature from 20 degrees C to 1000 degrees C. If the starting pressure was one atmosphere...
*Saturday, October 29, 2011 by Deborah*

**Science**

Is genetic engineering the answer to ending global hunger?
*Friday, October 28, 2011 by Akira*

**English**

Can someone edit this essay? Topic is "if given funding for a small engineering project, what would you do?" 250 word limit Millions of Americans purchase bottled water everyday simply because they don't like the taste of their own tap water. While most Americans...
*Wednesday, October 26, 2011 by Mathew*

**engineering**

The 50-kg stone has a speed of v_A = 8m/s when it reaches point A.Determine the normal force it exerts on the incline when it reaches point B. Neglect friction and the stone's size.
*Wednesday, October 19, 2011 by HELP!!!*

**physics**

Your engineering firm is asked to specify the maximum load for the elevators in a new building. Each elevator has mass 500 kg when empty and maximum acceleration 2.25 m/s^2. The elevator cables can withstand a maximum tension of 19.6 kN before breaking. For safety, you need to...
*Friday, October 14, 2011 by mera*

**Engineering Statistics**

"A study has shown that 20% of all college textbooks have a price of $90 or higher. It is known that the standard deviation of the prices of all college textbooks is $9.50. Suppose the prices of all college textbooks have a normal distribution. What is the mean price of ...
*Tuesday, October 11, 2011 by Christian*

**engineering**

A slotted bar is attached to the origin and rotates in the horizontal plane with a constant angular velocity of 0.665 radians/s . The bar moves a roller weighing 33.6 lb along the cam's perimeter. A spring holds the roller in place; the spring's spring constant is 1.34...
*Tuesday, October 11, 2011 by HELP PLEASE! DOn't know How to do it!!! :(*

**Engineering Economics**

Sales of bottled water in the U.S totaled 16.3 gallons per person in 2004. Water costs .40 cents per bottle.A municipal company provides tap water for $2.10 per 1000 gallons. If the average person drinks two bottles of water per day or uses 5 gallons per day in getting that ...
*Monday, October 10, 2011 by Margie*

**MATH**

At McLeod University, thirty percent of the students are in Engineering. Forty percent of Engineering students study Probabilistic Systems, and sixty percent of the students studying Probabilistic Systems are in Engineering. What percentage of students at McLeod are either in ...
*Thursday, October 6, 2011 by Sarah*

**English**

What do you thing of an exercise on reporting verbs like the one that follows? I'm postin you just some examples. Put the following into the indirect speech using a suitable reporting verb. 1) "You took my money", he told Emma. 2) "I think you should do ...
*Tuesday, October 4, 2011 by Henry2*

**statistics**

At a certain college, there were 400 science majors, 100 engineering majors, and 600 business majors. If one student was selected at random, the probbility that they are an engineering major is
*Saturday, October 1, 2011 by Diva99*

**engineering science**

A ramjet is to propel an aircraft at Mach 3 at high altitude where the ambient pressure is 8.5 kPaand the ambient temperature T-node is 220 K. The turbine inlet temperature T is 2540 K. If all components of the engine are ideal - that is, frictionless - determine (a) the ...
*Thursday, September 29, 2011 by david*

**engineering **

: The coat hanger shown below is made of PVC (polyvinyl chloride). The neck of the hanger is 0.010 m in diameter and is 0.10 m long. If a coat hangs on the hanger, the length of the neck will increase by 1.00 x10 -5 m. 1. What is the mass of the coat? 2. How many such coats ...
*Wednesday, September 28, 2011 by sandeep*

**statistics**

at a certain college, there were 700 science majors,100 engineering majors and 500 business majors. if one student was selected at random, the probability that they are an engineering major is?
*Tuesday, September 27, 2011 by carol*

**Physics**

Engineering 100 Homework Problem #1 Below is a diagram of a beam supported on the left end by a pin connection, and toward the right side by a simple fulcrum. A force F is applied to the far right end of the beam as shown. The uniform beam has mass, m, length, l, and the ...
*Tuesday, September 27, 2011 by Jamie*

**engineering physics**

An object of mass m is dropped at t=0 from the roof of a building of hdight h. A wind blowing parallel to the face of the building exerts a constant force F on the object. At what time t does the object strike the ground? Express t in terms of g and h.
*Sunday, September 25, 2011 by Margaret*

**engineering**

A cylinder has 500 cm^3 of water. after a mass of 100 grams of sand is poured into the cylinder and all air bubbles are removed by a vacuum pump, the water level rises to 537.5 cm^3. Determine the specific gravity of the sand?
*Wednesday, September 21, 2011 by Marilyn*

**Engineering**

It is found that ozone reaction in water nearly follows first-order kinetics in ozone concentration decreases by 50% in 12 minutes (t1/2 = 12 min). A water supplier wants to inject ozone into a pipe bringing water to thee water treatment plant to pre-disinfect the influent. ...
*Monday, September 19, 2011 by Jimmy*

**Environmental Engineering**

Consider the air over a city to be a box 100km on a side that reaches up to an altitude of 1.0 km. THe air is blowing into the box along one of its sides with a speed of 4 m/s. Suppose an air pollutant with a reaction rate of K = 0.20/hr is emitted into the box at a total mass...
*Monday, September 19, 2011 by Jimmy*

**engineering**

The velocity of a sports car is graphed as a function of time . Use the graph to answer the questions. a) Find the sports car’s maximum velocity, , during the 10- interval depicted in the graph. b) During which time interval is the acceleration positive?
*Monday, September 19, 2011 by AnaLuisa*

**Environmental Engineering**

A bankrupt chemical firm has been taken over by new management. On the property they found a 20,000 m3 brine pond containing 25,000 mg/L of salt. The new owners propose to flush the pond into their discharge pipe leading to the Atlantic Ocean, which has a salt concentration ...
*Friday, September 9, 2011 by RaeZur*

**ap biology**

how has genetic engineering modified darwins theories?!?
*Wednesday, September 7, 2011 by Anonymous*

**engineer**

If you possess a recognized diploma in marine engineering, will working onboard a ship as a marine engineer a better choice compared to working at shipyards or on land as a sales engineer in term of salary, freedom, risk, nature of job and area of job scope. Please help. Thanks!
*Tuesday, September 6, 2011 by marine engineer*

**Physical Education**

Preliminary design of a compressor drive train Determine the force-time function within the compressor’s cylinder and the torque-time function acting on the input shaft on the compressor during any cycle. Given: Compressor speed is 1500rpm. The compressor has a bore of 3....
*Wednesday, August 24, 2011 by IceBerg*

**engineering**

Does winmax interfare with each other if they comes in contact?
*Sunday, August 21, 2011 by subash*

**engineering**

what is civil engineering?
*Sunday, August 21, 2011 by lee*