Thursday
April 24, 2014

Search: efficiency

Number of results: 771

microeconomics
suppose two passagers both end up with a reservation for the last seat on a train from san franciso to los angeles. two alternatives are proposed: a)toss a coin b)sell the ticket to the highest bidder. compare the two from the standpoint of efficiency and equity.
Sunday, February 21, 2010 at 8:54am by ronie

Agricultural Policy
Find the price and quantity that will satisfy the condition for static efficiency in the use of water resources given the following demand and supply equations for water: Demand: P=600-Q Supply: P=2+Q
Tuesday, February 17, 2009 at 9:02pm by jesse

physics
A load of 500N is raised 0.2m by a machine in which an effort of 150N moves 1m.What is a) the work done on the load b)the work done by the effort c)the efficiency
Wednesday, August 3, 2011 at 5:06am by Luc

PHYSICAL
A SIMPLE MACHINE PRODUCE 25 JOULES, WHAT IS THE OUTPUT WORK FOR EVERY 50 JOULES OF INPUT WORK. WHAT IS THE EFFICIENCY OF THIS MACHINE?
Sunday, January 13, 2013 at 5:26pm by FERNANDO

Business English
What are two or three solution that might improve the efficiency of my office What does each solution involve and how much work and money is required to introduce that change How exactly does each change solve the problem? which is the best solution at this time? why?
Friday, November 21, 2008 at 11:31am by Joycelyn

Physics
A pulley system is used to lift a piano 2.6 m. If a force of 2510 is applied to the rope as the rope is pulled in 14 m, what is the efficiency of the machine? Assume the mass of the piano is 750 kg. I know the equation is eff = Wout / Win I'm just confused on what I'm supposed...
Tuesday, March 29, 2011 at 9:14pm by Becky

chemistry
In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 39.0mi/gal , how many liters of gasoline would you need to buy to complete a 142-km trip in Europe? Use the following conversions: 1km=0.6214mi and 1gal=3.78L.
Sunday, September 8, 2013 at 10:44am by Anonymous

chemistry
In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 25.0mi/gal , how many liters of gasoline would you need to buy to complete a 142-km trip in Europe? Use the following conversions: 1km=0.6214mi and 1gal=3.78L.
Tuesday, February 11, 2014 at 3:51pm by Marzia

physics
A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C. Calculate the heat loss rate if the skin temperature is raised by 8 C by vigorous exercise.
Thursday, August 18, 2011 at 8:22pm by KAIT

physics
A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C. Calculate the heat loss rate if the skin temperature is raised by 8 C by vigorous exercise.
Thursday, August 18, 2011 at 8:27pm by KAIT

physics
A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C. Calculate the heat loss rate if the skin temperature is raised by 8 C by vigorous exercise.
Thursday, August 18, 2011 at 8:27pm by KAIT

math
twelve cans, each 6.6 cm in diameter are packed into a carton. what is the efficiency of this package; that is, what percent of the total base area of the carton is covered by the cans? (use the formula A = πr^2 to calculate the area of a circle)
Wednesday, September 25, 2013 at 8:31pm by Evelyn

Biology:respiration in plant
How do i define the efficiency of respiration in words Since this is not my area of expertise, I searched Google under the key words "plant respiration" to get these possible sources: http://www.sciencedaily.com/releases/2004/07/040723093305.htm http://photoscience.la.asu.edu/...
Thursday, March 15, 2007 at 12:46pm by bonita

college/Agricultural policy
Find the price and quantity that will satisfy the condition fpr static efficiency in the use of water resources given the following demand and supply equations for water: Demand: P=600-Q Supply: P=2+Q
Tuesday, February 17, 2009 at 8:49pm by jesse

algebra
Testers drive 8 vehicles 200 miles on a test track at the same speed. The table shows the amount of fuel ea vehicle uses. Find the fuel efficiency in miles per gallon for each vehicle.
Thursday, October 22, 2009 at 9:12pm by Tarik

physics
Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
Tuesday, October 5, 2010 at 9:23am by Kim

PHYSICS ---HELP!
Water flows approx. 0 over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
Wednesday, October 6, 2010 at 11:16am by Leila

Physics
Water flows approx. 0 over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
Wednesday, October 6, 2010 at 1:24pm by Rick

business
What is the value to the company and the supplier in developing and implementing a Third Party Supplier Relationship Management (3 P.L. S.M.S.) System? How can such a system provide greater efficiency? In 200-250 words, describe the value to the organization.
Wednesday, January 9, 2013 at 9:48pm by Jared

Physics
A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the incline (T = 315 N). If the bed of the truck is 1.2 m above the ground what is the efficiency of this simple machine in loading the box into ...
Thursday, April 7, 2011 at 9:27pm by Matt

Physics :D
An electric motor is tested and found 76% efficient. if the input work is 400 J, what is the motors output work? A ramp has a length of 4m and a height of 1.5m. If a man pushes a 40N crate to the top of the ramp with a force of 60N, what is the efficiency of the ramp? How do I...
Monday, December 12, 2011 at 9:33pm by Kellie

Electricity
A motor running at its rated power provides 2.6 lb-ft torque at its rated speed of 2020 rpm. The motor draws 5.6-A from a 230-V supply at a phase angle of 37 degrees. Determine the following: The horsepower delivered by the motor, The efficiency of the motor.
Thursday, January 24, 2008 at 2:50pm by Nick

physics/ math
Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
Tuesday, October 5, 2010 at 11:05am by josh

Physics
container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
Wednesday, July 18, 2012 at 7:12pm by Rob

Physics
container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
Wednesday, July 18, 2012 at 8:56pm by Rob

Science
container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
Wednesday, July 18, 2012 at 9:38pm by Jack Hill

Physics
A particular microwave oven operates at 1000W. The wavelength of the microwave is 12.0cm. You decide that you like your snack to absorb 1.2 x 10^28 photons. For how much time should you have the oven on- with your snack inside of course. Assume 100% efficiency.
Wednesday, August 1, 2012 at 12:02am by Rosh

science
a river does 6500J of work on a water wheel every second.The wheels efficiency is 12 percent.A)How much work in joules can the axle of the wheel do in a second? B)What is the power output of the wheel?
Sunday, March 3, 2013 at 6:02pm by kayla

physics
A Norwegian hydroelectric power plant is built on a small river. The water falls 400m from the mountains to the turbines. The flow is 80 m3/s. Calculate: a) the produced electric power; b) the value of production of one day (unit price = 10 cnt/kWh). The efficiency of ...
Thursday, September 30, 2010 at 10:23am by winget

English,maths,physics,chemistry
Topic:machine,a block and tackle of 6 pulleys is used to raise a load of 300N steadily through a height of 30m.if the work done against friction is 2000J. calculate:the work done by effort,the efficiency of the system,the applied effort.
Monday, March 19, 2012 at 5:40pm by Chigozie

physics 2
a certain 12v storage battery with an internal resistance of 12 ohms delivers 80 A when used to crank a gasoline engine. if the battery mass is 20 kg and it has average specific heat of 0.2 kcal/kg K. what is its rise in temperaure during 1 min of cranking the engine. assume ...
Thursday, February 20, 2014 at 4:44am by Anne

Science
A man drinks a bottle of beer and proposes to work off its 460 kj by exercising with a 20 kg barbell. If each lift of the barbell from chest height to over his head is through 60 cm and the efficiency of his body is 10 percent under these circumstances, how many times must he ...
Friday, August 31, 2007 at 8:03pm by Michele

science
A crane whose motor has a power input of 5.0 kW lifts a 120-kg load of bricks through a height of 30m in 90s. what is the efficiency of the crane, which is the ratio between its output power and its input power.
Monday, February 19, 2007 at 2:10am by tasha

physics
The maximum possible efficiency of a heat engine which exhaust its heat at a temperature of 46.0o is 39.0 percent. What is the minimum value of the temperature at which the engine takes in heat? (in oC).
Friday, November 16, 2012 at 9:17pm by Erika

physics
The maximum possible efficiency of a heat engine which exhaust its heat at a temperature of 46.0o is 39.0 percent. What is the minimum value of the temperature at which the engine takes in heat? (in oC).
Sunday, November 18, 2012 at 1:37pm by chelsea

Algebra
A machine has a work output of 28ax^5 joules and a work input of 7a^2x^6 joules. What is the efficiency of the machine?
Sunday, August 5, 2012 at 2:06am by Lizzie

PHYSICS
Given: The energy equivalent of one gallon of gasoline is 1.3 108 J. A compact car has a mass of 847 kg, and its efficiency is rated at 18.1%. (That is, 18.1% of the input power available is delivered to the wheels.) Find the amount of gasoline used to accelerate the car ...
Thursday, April 7, 2011 at 3:40am by anonymous

Physics
1. A 2.5kg rock is dropped from a 350m cliff. It hits the ground with a speed of 60 m/s. What percent of its mechanical energy was lost to air resistance? -the answer is 48% 2. A motor uses 5500J to lift a 35kg object a vertical distance of 12m. What is the efficiency of the ...
Sunday, June 17, 2012 at 3:34am by lenny

French
I am doing a presentation on the efficiency of appliances. I am going to be comparing the past and the present and then France and the US. Do you guys know of any good websites that would talk about any of this. All I can really find is different brands of appliances and then ...
Wednesday, April 4, 2012 at 9:44am by rebekah

french
I am doing a presentation on the efficiency of appliances. I am going to be comparing the past and the present and then France and the US. Do you guys know of any good websites that would talk about any of this. All I can really find is different brands of appliances and then...
Thursday, April 5, 2012 at 8:52am by rebekah

Physics
elbow raises a 1200 N piano a distance of 5 meters using a set of pulleys. elbow pulls in 20.0 meter of rope while exerting a force of 340 N. a) what is the work output? b) what is work input c) what is the mechanical advantage of this machine? d) what is the efficiency of ...
Sunday, November 3, 2013 at 7:43pm by Andy

social studies
to achieve full employment without inflation; > to restore external equilibrium and defend the dollar; > to enhance the efficiency and flexibility of our private and public economies; > to widen the benefits of prosperity; > to improve the quality of American life...
Saturday, February 6, 2010 at 2:21pm by love

Physics
Electric stairs bring people up from Newyork metro station. Calculate the power consumption of the stairs during the rush hour if the stairs elevate 120 persons per minute up to the street level 30 meters above. Assume that the average weight of passengers is 70 kg and the ...
Thursday, September 30, 2010 at 10:30am by winget

economics
Need Help on my final exam. Willing to reward for help. 1. Relate the legal concept of tort to the economic concept of externalities. 2. Does the existence of a tort necessarily mean that economic inefficiency is present? How do torts differ from other types of externalities? ...
Monday, May 11, 2009 at 11:21pm by Sung

physics
A theoretical gasoline engine runs with 76 percent efficiency. It is calculated that it expels 3.25*10^4 J of heat. a. Find the heat absorbed in one cycle. b. Find the work output in one cycle.
Saturday, March 17, 2007 at 9:34pm by anonymous

economic
ASSIGNMENT 5: DUE 4.00PM, 4/09/08 1. A competitive firm uses coal to generate electricity. Its supply curve is Q = 300P - 1000, where Q is quantity produced (units of electricity per year), and P is market price of electricity per unit. The production of each unit of ...
Tuesday, September 2, 2008 at 12:43pm by qweiop90

Physics 1
The label on a candy bar says 470 Calories. Assuming a typical efficiency for energy use by the body, if a 74 person were to use the energy in this candy bar to climb stairs, how high could she go?
Tuesday, March 30, 2010 at 8:18pm by Naso

physics
The label on a candy bar says 470 Calories.Assuming a typical efficiency for energy use by the body, if a 74 kg person were to use the energy in this candy bar to climb stairs, how high could she go?
Wednesday, March 31, 2010 at 10:08am by ziddi

History
Efficiency was a central theme of the reform movement. Who of the following was not an example of someone striving to examine every aspect of life itself and determine, often through new scientific principles, how to do more work with less energy? (Points : 1) Frederick W. ...
Sunday, July 15, 2012 at 9:59am by Geraline

physics
The label on a candy bar says 410 Calories.Assuming a typical efficiency for energy use by the body, if a 74kg person were to use the energy in this candy bar to climb stairs, how high could she go?
Saturday, November 13, 2010 at 5:34am by Isabel-A

physic
A turnbuckle is needed to apply an 8kN force on a cable. If the efficiency of the turnbuckle is 40% and the force applied is 159.155N with a lever of 20cm in length. a) Find the mechanical advantage. b) Find the velocity ratio. c) Find the mean pitch of thread.
Thursday, April 2, 2009 at 9:05pm by luc

Physics
Simple Machines A simple wheel and axle has a wheel diameter of 2.3m and an axle diameter of 92mm. If an effort of 26N is required to raise a mass of 16 kg what is the efficiency of the machine? A- 2.46% B- 95.3% C- 24.1% D- 20.1% E- 65.5% I am having a problem determining ...
Saturday, May 11, 2013 at 3:10pm by Danny

physics
A small motor draws a current of 1.76 A from a 110 V line. The output power of the motor is 0.20 hp. (a) At a rate of $0.060/kWh, what is the cost, in cents, of operating the motor for 4.0 h? (b) What is the efficiency of the motor? for (a) i am doing IV*hours*price and its ...
Monday, March 14, 2011 at 7:02pm by julie

physics
you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 80 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 690 kcal have been burned at the end of the workout, what efficiency is the machine using in ...
Sunday, December 4, 2011 at 6:25pm by Shawn

managerial Accounting
Smith Co uses a standard cost system for its single product in which variable manufacturing overhead is applied on the basis of direct labor hours. The following information is given: 4 Standard costs per unit: Raw materials (1.5 grams at $16) $24.00 Direct labor (0.75 hour at...
Thursday, September 30, 2010 at 6:48pm by Klatoyaa

Physics
the input and output of hydraulic jack are respectively 1 cm and 4 cm in diameter. A lever with a mechanical advantage of 6 is used to apply force to the input piston. How much mass can the jack lift if a force of 180 N is applied to the lever and efficiency is 80%
Monday, October 22, 2012 at 12:26am by Owen

physics
A boy is pushing his sled up a snowy slope. The sled has a mass of 20.4 kg and weighs 200 N. The boy pushes with a constant force of 75 N. The sled travels a distance of 10 m and gains 3 m in height. When the sled reaches the top, it is traveling 2 m/s. What is the efficiency ...
Wednesday, March 27, 2013 at 12:34pm by bill

Literacy
Efficiency can best be defined as A. the amount of output generated in a given amount of time. B. producing items using the least amount of resources. C. using high-tech equipment on a job. D. producing as much as you can as fast as you can, regardless of cost. my answer is B
Saturday, January 21, 2012 at 11:54pm by Heather

Help! Physics!!
Water flows (v = approx 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency. Express your answer using two significant ...
Thursday, October 7, 2010 at 9:57am by Melissa

Water Treatment
a) Which five quality parameters of the raw water may not meet drinking water standards? Bacterial colony count (less than 100 cfu/ml) Ammonium (less than 0.2 mg/l) Nitrite (less than 0.1 mg/l) Nitrate (less than 50 mg/l) Iron (less than 200 g/l) Turbidity (less than 4 FTE) ...
Friday, October 18, 2013 at 3:49pm by youlife2015

Water-Treatment
a) Which five quality parameters of the raw water may not meet drinking water standards? Bacterial colony count (less than 100 cfu/ml) Ammonium (less than 0.2 mg/l) Nitrite (less than 0.1 mg/l) Nitrate (less than 50 mg/l) Iron (less than 200 g/l) Turbidity (less than 4 FTE) ...
Saturday, October 19, 2013 at 7:20pm by youlifex

Water Treatment
a) Which five quality parameters of the raw water may not meet drinking water standards? Bacterial colony count (less than 100 cfu/ml) Ammonium (less than 0.2 mg/l) Nitrite (less than 0.1 mg/l) Nitrate (less than 50 mg/l) Iron (less than 200 g/l) Turbidity (less than 4 FTE) ...
Sunday, October 20, 2013 at 7:41pm by youlifex

Chem
Hi! I need help with this problem, also I was wondering what kind of problem is this... limiting reactant?calculate the mass of hydrogen cyanide that could be produced by the complete reaction of 500.0 g of ammonia, 700.0 g of oxygen and 400.0 g of methane according to the ...
Tuesday, April 20, 2010 at 1:41pm by Anonymous

UNCP
In a study of worker efficiency at Wong Laboratories it was found that the number of components assembled per hour by the average worker t hours after starting work could be modeled by the formula. Rewrite the formula by factoring the right-hand side completely. b) Use the ...
Friday, January 7, 2011 at 5:40pm by casey

eco
Does GDP accurately reflect our nation's productivity?Explain GDP is a pretty accurate measurement of total goods and services produced. It does not accurately measure the efficiency (productivity, per manhour or per resources used) in generating this production
Tuesday, June 26, 2007 at 7:21pm by stacy

Physics
FIGURE: h t t p : / / g o o . g l / a 7 j C F The figure is a PV diagram for a reversible heat engine in which 1.0 mol of argon, a nearly ideal monatomic gas, is initially at STP (point a). Points b and c are on an isotherm at T = 423 K. Process ab is at constant volume, ...
Wednesday, December 1, 2010 at 6:49pm by Elgoog

Physics
FIGURE: h t t p : / / g o o . g l / a 7 j C F The figure is a PV diagram for a reversible heat engine in which 1.0 mol of argon, a nearly ideal monatomic gas, is initially at STP (point a). Points b and c are on an isotherm at T = 423 K. Process ab is at constant volume, ...
Wednesday, December 1, 2010 at 9:49pm by Schnitzel

Physics
I eat a 500 Calorie lunch and go hiking up a mountain afterwards. Assuming that chemical energy is converted to gravitational potential energy with 50% efficiency, approximately how many miles up the mountain can I go before I need my dinner? 0.5 miles 1 mile 2 miles 3 miles 4...
Sunday, October 7, 2012 at 2:47am by StressedStudent

physics
A gasoline engine runs with 28 percent efficiency. It expels 3.60x10^4 J of heat in each cycle. a. Find the heat absorbed in one cycle. 128,571.4????? b. Find the work output in one cycle.
Monday, February 19, 2007 at 4:21am by anonymous

Health Physics
As a result of doing work, a person supplies a machine with 1100 J of energy in 12 seconds. The machine in turn does work and delivers 900 J of energy in 14 seconds to some object. What is the efficiency of this machine?
Friday, January 22, 2010 at 7:52pm by Shannon

physics
With each cycle, a 2650-W engine extracts 2330 J from a thermal reservoir at 85.1C and expels 1840 J into a thermal reservoir at 20.9C. a) What is the work done for each cycle? b) What is the engine's efficiency? c) How much time does each cycle take?
Sunday, January 1, 2012 at 9:39am by maria

physics
(a) How much waste heat is produced by an electrical power station that uses 1.05 multiplied by 1014 J of heat input with an efficiency of 40.0%? (b) What is the ratio of waste heat to work output? (c) How much work is done?
Wednesday, July 24, 2013 at 9:54pm by Eric

Physics
In each cycle of its operation, a heat engine expels 6,100 J of energy and performs 1,300 J of mechanical work. (a) How much thermal energy must be added to the engine in each cycle? (J) (b) Find the thermal efficiency of the engine. (%)
Monday, November 26, 2012 at 4:27pm by Sam

economics
What is the difference between the application of strict liability in products liability and in other applications of strict liability? Do these different concepts of strict liability have different implications for economic efficiency?
Monday, May 11, 2009 at 11:11pm by Sung

Physics
As a result of doing work, a person supplies a machine with 1100 J of energy in 12 seconds. The machine in turn does work and delivers 900 J of energy in 14 seconds to some object. What is the efficiency of this machine?
Monday, January 25, 2010 at 10:21am by Anonymous

Math
A real estate company owns 218 efficiency apartments, which are fully occupied when the rent is $940 /month. The company estimated that for each $25 increase in rent, 5 apartments will become unoccupied. What rent should be charged so that the company will receive the maximum ...
Sunday, January 26, 2014 at 7:47pm by Anonymous

chemistry
The first ionization energy of a carbon atom is 1.81 aJ. What is the frequency and wavelength, in nanometers, of photons capable of just ionizing carbon atoms? v=______s^(-1) lambda =_____nm Assuming an ionization efficiency of 47.0%, how many such photons are needed to ionize...
Tuesday, April 2, 2013 at 6:58am by Anonymous

chemistry
The first ionization energy of a carbon atom is 1.81 aJ. What is the frequency and wavelength, in nanometers, of photons capable of just ionizing carbon atoms? v=______s^(-1) lambda =_____nm Assuming an ionization efficiency of 47.0%, how many such photons are needed to ionize...
Tuesday, April 2, 2013 at 7:02am by Anonymous

Solar Energy Help ASAP
A solar cell with dimensions 12cm x 12cm is illuminated at standard test conditions. The cell presents the following external parameters: Voc=0.8V,Isc=3A,Vmp=0.75V,Imp=2.5A Calculate the fill factor in percentage [%]: Calculate the efficiency (in %):
Thursday, October 17, 2013 at 3:50pm by Anonymous

Science
Hi, I asked this question earlier, but didn't get any replies. If anybody could help, it would be extremely appreciated! A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the incline (T = 315 N). ...
Thursday, April 7, 2011 at 10:51pm by Matt

Biology { PLEASE HELP :D }
From an ATP production viewpoint, use fact B to make a statement regarding the efficiency of fats vs. carbs. Fact b - Carbs bind and store water. The metabolism of water yields no ATP. Fat has no water bound to it.
Monday, March 25, 2013 at 8:22pm by Emily

Physic
Air moving at 13.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and having an efficiency of 29.0%. The energy generated by the windmill is used to pump water from a well 31.0 m deep into a tank 2.30 m above the ground. At what rate in liters per minute can ...
Sunday, November 18, 2012 at 9:22pm by Thanh

Physic
Air moving at 13.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and having an efficiency of 29.0%. The energy generated by the windmill is used to pump water from a well 31.0 m deep into a tank 2.30 m above the ground. At what rate in liters per minute can ...
Sunday, November 18, 2012 at 10:12pm by Thanh

bio
I am doing the biology ap bacteria DNA transformation lab and I came up with a transformation efficiency of 150,000. I read somewhere that they should be between 2,000-8,000. is my answer way off? My group counted an average of 1529 colonies to begin with so i dont see how the...
Friday, May 17, 2013 at 10:15am by hannah

ped212
Discuss the differences between process and product evaluation. Give examples of each type of evaluation. Discuss the value of each type of evaluation. What is the significance of focusing on the process in physical education? How does this information help you as a teacher to...
Monday, October 3, 2011 at 9:15pm by tamika

PHYSICS DUE SOON
In each cycle of its operation, a heat engine expels 6,100 J of energy and performs 1,300 J of mechanical work. (a) How much thermal energy must be added to the engine in each cycle?_____J (b) Find the thermal efficiency of the engine.____%
Thursday, November 29, 2012 at 3:47pm by Ame

biology 2
The digestive, circulatory, respiratory, immune, and excretory systems all work together to maintain homeostasis. Discuss how a minor malfunction in one of these systems could lead to major malfunctions in others. If methods were developed to improve the efficiency and ...
Monday, June 25, 2012 at 6:23pm by sheehan

biology 2
The digestive, circulatory, respiratory, immune, and excretory systems all work together to maintain homeostasis. Discuss how a minor malfunction in one of these systems could lead to major malfunctions in others. If methods were developed to improve the efficiency and ...
Monday, October 14, 2013 at 8:42am by rayan

physics
ir moving at 10.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and having an efficiency of 26.5%. The energy generated by the windmill is used to pump water from a well 28.0 m deep into a tank 2.30 m above the ground. At what rate in liters per minute can ...
Sunday, November 18, 2012 at 10:15pm by Emily Tran

physics
A lift is used to carry boxes to the top floor of a hotel 20m high.A total weight of 100kg of boxes was caried up in 20second.If the useful output of the engine driving the lift mechanism is 1.2 kilowatt.calculate the efficiency of the engine of the lift mechanism.
Wednesday, October 12, 2011 at 4:05pm by Blessig iliya

ACC350
Operations deals with how the company is performing. Operations may be refined into different manufacturing processes such as design, material acquisition, assembly, testing and so on. A VP of operations has asked you to make recommendations at the weekly status meeting on how...
Monday, November 16, 2009 at 9:24am by new things

calculus
The efficiency of an internal combustion engine is given by E= (1-v/V)^0.4 Where V and v are the respective maximum and minimum volumes of air in each cylinder. a) Show that ∂E/ ∂V > 0 and interpret your result b) Show that ∂E/ ∂v < 0 and ...
Sunday, March 11, 2012 at 1:22pm by help

calculus
The efficiency of an internal combustion engine is given by E= (1-v/V)^0.4 Where V and v are the respective maximum and minimum volumes of air in each cylinder. a) Show that ∂E/ ∂V > 0 and interpret your result b) Show that ∂E/ ∂v < 0 and ...
Monday, March 12, 2012 at 5:45am by wei

physics
7150/(33.5e4) = g ice doesn't work. Am I calculating incorrectly? heat of fusion for water is 334 J/g. You want it in J/g since q is given in the problem in J. The answer will be in units of grams of ice. You will need to change to kg since the problem asks for it in kg. ...
Tuesday, December 12, 2006 at 8:35pm by Ann

Calc
Ralph is taking his final exam. After t minutes into the exam Ralph has correctly solved P(t)=-.001t^3+.078t^2+.16t problems. a) at what time was Ralph solving problems most efficiently? b) at what time did Ralph's efficiency decline?
Sunday, December 9, 2007 at 7:58pm by Britt

Business management quest
A college professor told her students, The purpose of a management course is to teach students about management, not to teach them to be managers. Do you agree or disagree with this statement? Why or Why not? Also, is efficiency and effectiveness more important to ...
Saturday, December 3, 2011 at 10:52pm by Sonya

Physics
A student uses a bottle opener to find that a force of 15 N must be exerted to lift a cap 1.4mm. The opener has a velocity ratio of 16 and efficiency of 90% (a) What is the mechanical advantage of the opener? (b) What force is applied to the bottle cap? (c) How far does the ...
Tuesday, July 7, 2009 at 4:28pm by Mohammedabbas

Integrated Physics and Science
A crowbar is used as a lever. The effort force of 40 newtons moves 3 meters. The resistance force of 54 newtons moves 2 meters. What is the efficiency of the lever? A) 100% because energy must be conserved B) 90% C) 25% D) 18% i need help. i don't know how to figure this one out
Monday, January 10, 2011 at 11:07am by Nella

renewable energy
If a solar cell with 2 m^2 surface area is placed in a direct light having 780 W/m power density provides an output power of 346 W, what is the efficiency in percent? (0 to 100 %, no decimals). Provide your answer in base units (no scientific notation or magnitude modifiers ...
Saturday, January 29, 2011 at 11:48am by christian

phy
An engine absorbs 2000j of heat from a hot reservoir and expels 750j to a cold reservoir during each poerating cycle, (i)what is the efficiency of the engine (ii)How much work is done during the cycle? (iii)What is the power output of the engine if each cycle last for 0.5 ...
Thursday, July 4, 2013 at 8:02am by kate

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