# Rank the crystal lattice structures in order of decreasing efficiency of space in the structure.

20,951 results, page 55-
## Science

What is the difference between conserving energy and energy efficiency? What are 5 benefits of conserving energy?

*asked by Anonymous on June 11, 2014* -
## math

1. You have recently found a location for your bakery and have begun implementing the first phases of your business plan. Your budget consists of an $80,000 loan from your family and a $38,250 small business loan. These loans must be repaid in full within

*asked by Anonymous on September 26, 2009* -
## Calculus

Suppose that f(x)=3x^3+3x. Find all critical values of f. Then use interval notation to state when f(x) is increasing and when f(x) is decreasing and to state when f(x) is concave up and concave down. Find the local maxima and local minima. Find all

*asked by Skirby on November 6, 2013* -
## ecoc

TC=50+16 Q -2 Q2+0.2 Q3 a.plot this curve for quantites 1 to 10 b.calculate the average total cost,average variable cost, and marginal cost for these quantities, and plot them on another graph c. discuss your results in term of decreasing,constant, and

*asked by kim on August 9, 2007* -
## critical thinking

Which of the following is not a way to succeed in college? A. Be flexible with planning activities B. avoid procrastination C. establish realistic goals for yourself D. organize a work space my answer is b.

*asked by Saddia on March 22, 2015* -
## early childhood

which of the following is best suited to a formative assessment of progress 1. muscular strength snd endurance 2. body fat analysis 3. flexibility 4. qwareness of self and space

*asked by mary on March 14, 2013* -
## early childhood education

which one of these factors is most likely to determine the total number of children you can take into your facility (a)physical space available (b)childreds need (c)staff members skills (d)program philosophy

*asked by rowan on June 22, 2011* -
## Math

How many tiles of length 8cm breath 5cm are needed to tile a floor of dining space which is 400 cm long and 300 cm wide

*asked by Anonymous on January 17, 2016* -
## science

Grapic organizer.show details that support this main ideals.thermal energy moves through solids liquid, gases and space

*asked by anonymous on December 3, 2012* -
## Science

I'm trying to figure out the ratio of floor to window space needed for passive solar heating...some sources say windows should be equivalent to 8% of the floorspace, others 80%? What do you think is the most realistic?

*asked by Heather on April 12, 2011* -
## adult education

How do a write this sentence so it is parallel. Every town and city needs more parking space and places where people can recreate, and to have more money from taxes to pay for these things.

*asked by Toni on October 27, 2008* -
## fundamental concepts

Free play, eating a snack, painting, hearing a story, and so forth are related to which of the following learning concepts? A. Space B. Classification C. Size D. Time a.

*asked by Luis on February 15, 2015* -
## Physical Science

Harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that they have been in a different....? health plan :-) spcae times

*asked by Gina on March 30, 2007* -
## Humanities

The style that fills the picture space with figures and uses bright colors and lots of gold is called? a. Romanesque b. Renaissance c. three-dimensional d. gothic e. none of the above

*asked by Marilu on January 30, 2009* -
## a&p

If an astronaut returned to earth after a 180 day stay in a weightless space station he would have a decrease in bone mass? true or false?

*asked by sam on May 4, 2008* -
## From theory and practice

Which of the following is best suited to a formative assessment of progress? A. Muscular strength and endurance B. Awareness of self and space C. Body fat analysis D. Flexibility My answer is B

*asked by Amanda on July 16, 2015* -
## Maths

How much air space is contained inside a rectangular cardboard box that has the dimensions 85 cm by 62 cm by 36 cm. Answer using cubic metres correct to two decimal places.

*asked by simone on April 18, 2017* -
## physics

The earth's atmosphere extends to a height of nearby 200KM above its surface there many be explosion and noises taking place in the outer space but we do not hear them.why?

*asked by Vivek on January 3, 2012* -
## Living a Healthy Life

The National Association for the Education of Young Children recommends a minimum of _______ square feet of usable floor space per child. A. 50 B. 10 C. 35 D. 45 C.

*asked by Amanda on November 22, 2014* -
## Physics

Two identical particles, each of mass 1400 kg, are coasting in free space along the same path. At one instant their separation is 30.0 m and each has precisely the same velocity of 820 m/s. What are their velocities when they are 4.00 m apart?

*asked by tmigs on June 2, 2010* -
## science

Three very small spheres of mass 3.00 kg, 5.00 kg, and 3.00 kg are located on a straight line in space away from everything else. The first one is at a point between the other two, 13.0 cm to the right of the second and 24.0 cm to the left of the third.

*asked by Rachel on June 27, 2012* -
## Calculas

(Inventory Cost) A shopkeeper finds that the cost C of ordering and storing the latest laptop is C = 2 x + (300000 / x), where x is in the interval [1, 300]. The delivery of truck can bring at most 300 units per order. (a) Find the order size that will

*asked by matthew on December 16, 2011* -
## Physics

On a postition versus time graph to find the acceleration you would simply find the area under the graph right? and how would you figure out whether acceleration is increasing, decreasing, constant of unknown from a graph? My guess is that the accereration

*asked by Tammy on September 21, 2007* -
## Business Math

Please answer these problem for me.Thanks so much. 1. Border's Bookstore ordered 800 art books. On verifying the order, only 160 books were actually received. The percent of the order missing was: 2. The net price equivalent rate of 9/15/18 is: 3. If the

*asked by Angela on October 19, 2011* -
## Please help-Math

Please answer these problem for me.Thanks so much. 1. Border's Bookstore ordered 800 art books. On verifying the order, only 160 books were actually received. The percent of the order missing was: 2. The net price equivalent rate of 9/15/18 is: 3. If the

*asked by Angel on October 19, 2011* -
## Math

Please answer these problem for me.Thanks so much. 1. Border's Bookstore ordered 800 art books. On verifying the order, only 160 books were actually received. The percent of the order missing was: 2. The net price equivalent rate of 9/15/18 is: 3. If the

*asked by Angela on October 19, 2011* -
## Physics

Your dog has been diagnosed with a terminal illness for which there is no cure. The Veterinarian expects that it will live for 1 year before it succumbs to the condition. You have the idea that if you could keep the dog alive a little longer, a cure might

*asked by Jon on January 22, 2010* -
## english pt.2

I acquired a strong foundation of writing skills, including the ability to write op-eds, proposals, and memos. Throughout my studies I demonstrated the ability to be a team player who enjoys team settings yet maintains efficiency when working alone to

*asked by ann on December 17, 2015* -
## chemistry

can you explain how to find the bond order of (σ1s)^2(σ1s*)^2(σ2s)^2(σ2s*)^2(σ2p)^2(π 2p)^4(π 2p*)^2... I know that Bond order = (number of bonding electrons - number of antibonding electrons)/2 but i have no idea what to do..

*asked by Sarah on July 4, 2013* -
## Calculus

Can someone help me finish this question... I got most of the answers but need help. Suppose that f(x)=3x−6x+5. (A) Use interval notation to indicate where f(x) is defined. If it is defined on more than one interval, enter the union of all intervals

*asked by Nicola on November 27, 2011* -
## Chemistry

Quick question: How can I be sure that a slow reaction is not running out of reagents? Thanks The question is too general for a quick answer. Depending upon the reaction, intensity of color (either decreasing or increasing) might be one way, the odor of a

*asked by Chrissy on April 24, 2007* -
## trig

A spring is attached to the ceiling and pulled 17 cm down from equilibrium and released. After 3 seconds the amplitude has decreased to 16 cm. The spring oscillates 13 times each second. Assume that the amplitude is decreasing exponentially. Find an

*asked by Tricia on August 18, 2014* -
## 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?

*asked by Mohammedabbas on July 7, 2009* -
## physics

With each cycle, a 2650-W engine extracts 2330 J from a thermal reservoir at 85.1°C and expels 1840 J into a thermal reservoir at 20.9°C. a) What is the work done for each cycle? b) What is the engine's efficiency? c) How much time does each cycle take?

*asked by maria on January 1, 2012* -
## Chemistry

A Power plant rated at 800 MegaWatts generates steam at 585 K and discards heat to a river at 295 K. If thermal efficiency of plant is 70% of maximum value, how much heat is discarded to river at rated power? Please help with steps on how to solve this

*asked by Levi on September 28, 2014* -
## Math

Hello! I am not asking for the answer to this question, I am asking for a step-by-step explanation. Mr. Green band, choir, and math. This year, he has 57 students that take at least one of his classes. He teaches band to 25 students. There are 9 students

*asked by The Philly Inquirer on March 31, 2016* -
## Finance

AQ&Q has EBIT of $2 million, total assets of $10 million, stockholders' equity of $4 million, and pretax interest expense of 10 percent. A. What is AQ&Q's indifference level of EBIT? B. Given its current situation, might it benefit from increasing or

*asked by Anonymous on March 5, 2013* -
## Finance

AQ&Q has EBIT of $2 million, total assets of $10 million, stock holder’s equity of $4 million, and pretax interest expense of 10 percent. a) What is AQ&Q’s indifference level of EBIT? b) Given its current situation, might it benefit from increasing or

*asked by Anonymous on June 16, 2013* -
## Math

Find the intervals on which the function is increasing, decreasing, concave up, or concave down and find any local extreme values and inflection points. So I know how to do the above, but not with piece wise functions. Someone help me out? Y={3-x^2, x=0} I

*asked by Beth on February 3, 2016* -
## 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?

*asked by Britt on December 10, 2007* -
## PHYSICS NEED HELP FAST

A power plant has a power output of 1055 MW and operates with an efficiency of 33.0 percent. Excess energy is carried away as heat from the plant to a nearby river that has a flow rate of 1.1 x 10^6 kg/s. How much energy is transferred as heat to the river

*asked by ricki on March 2, 2011* -
## math

1. You have recently found a location for your bakery and have begun implementing the first phases of your business plan. Your budget consists of an $80,000 loan from your family and a $38,250 small business loan. These loans must be repaid in full within

*asked by Sequoiao9 on May 23, 2010* -
## physics

a 65 kg object is pulled at a constant velocity up an incline w/ a force of 95 N parallel to the incline. Assuming that the difference between the work output and input is work required to overcome friction, what is the force of friction along the incline

*asked by Jun on April 8, 2011* -
## Math-precalc

Is it possible to find a rational function that has x-intercepts (-2,0) and (2,0), but has vertical asymptote x=1 and horizontal asymptote of y=0? The horizontal asymptote and the x-intercepts parts stump me. If you can't reach y=0, then how can you get

*asked by Pamela on July 7, 2007* -
## Algebra

Im having a hard time figuring out this problem: Use the function, y=-(x+1)^2 +2, to answer the following parts. Find the y-intercept y=-(0+1)^2 +2 y=-(1)^2 +2 y=-1+2 y=1 is my answer Find the x-intercept 0=-(x+1)^2 +2 0=-((x^2)+(1^2))+2 0=-x^2 - 1 + 2

*asked by Mike on May 4, 2011* -
## math

the lengths of two legs of a right triangle depend on time. One, whose length is x increase at the rate of 5 feet per second, while the other, of length y, decreases at the rate of 6 feet per second. At what rate is the hypotenuse changing when x=3 and

*asked by Aaron on November 26, 2012* -
## calculus

Boyle's law states that if the temperature of a gas remains constant, then PV = c. Where P is the pressure, V is the volume, and c is a constant. Given a quantity of gas at constant temperature, if V is decreasing at a rate of 13 in.^3/s, at what rate is P

*asked by Hussain on May 3, 2010* -
## Calculus

A spotlight on the ground is shining on a wall 24\text{m} away. If a woman 2\text{m} tall walks from the spotlight toward the building at a speed of 0.6\text{m/s}, how fast is the length of her shadow on the building decreasing when she is 2\text{m} from

*asked by Spencer on December 8, 2015* -
## math

Let f(x) be a polynomial of degree 3 which has a critical point at(-1,8/3) and an inflexion point at(2,-46/3) (a)Determine f(x) . (b) Find another critical point of f(x) (if any). (c) Determine the intervals where f(x) is increasing and where it is

*asked by weloo_volley on April 21, 2012* -
## Physics

Blocks of mass 4, 8, and 24 kg are lined up from left to right in that order on a frictionless surface so each block is touching the next one. A rightward-pointing force of magnitude 15 N is applied to the left-most block. Suppose now that the left-right

*asked by Raji on February 21, 2011* -
## Algebra

The Reptile Farm has 400 square feet in which to house a collection of new lizards and frogs. A lizard requires 2 square feet of living space and costs $6 per month to feed. A frog also requires 2 square feet for living space but costs only $1 per month to

*asked by Anonymous on August 2, 2018* -
## Bio

The type of cartilage associated with bone function and development is what? I know that the elastic cartilage contains elastin which allows for elasticity and maintains shape of certain structures. Fibro is strong and rigid (strongest of 3) Hyaline

*asked by Lena on September 27, 2010* -
## Philosophy

Leibniz presents monads as simple substances. Monads are infinite in number, unextended, and windowless, and each mirrors the universe. As a consequence, Leibniz contends that the universe manifests both order and perfection. Why does Leibniz give monads

*asked by Joe on February 5, 2008* -
## business information system

ROI & NPV: wireless order-tracking system I need to identify the ROI and NPV of the wireless order-tracking system. Here is the information I have been given: - The acquisition cost is $35,000 paid at the time of installation. - It reduces the wait staff

*asked by Beatrice on September 3, 2010* -
## Finance

ROI & NPV: wireless order-tracking system I need to identify the ROI and NPV of the wireless order-tracking system. Here is the information I have been given: - The acquisition cost is $35,000 paid at the time of installation. - It reduces the wait staff

*asked by jackie on April 11, 2010* -
## physical science

A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine? A. 92 percent B. 94 percent C. 97 percent D. 96 percent

*asked by Unmei on May 27, 2014* -
## Literature/Social Studies (Ms. Sue!)

The New Frontier" by John F. Kennedy. 1. What ideas does Kennedy express by quoting William Brandford? A: By quoting William Bradford, Kennedy expresses the idea that, despite great difficulties, man can overcome anything through their will and

*asked by Anonymous on March 25, 2014* -
## Math

An ice cream store sells 30 different flavours of ice cream and it offers a choice of 3 different kinds of cones. In how many ways can we order a dozen two-scoop ice cream cones if any two of them in one order must differ at least by a flavor or by the

*asked by Excel on April 11, 2015* -
## Math

An ice cream store sells 30 different flavours of ice cream and it offers a choice of 3 different kinds of cones. In how many ways can we order a dozen two-scoop ice cream cones if any two of them in one order must differ at least by a flavor or by the

*asked by Excel on April 20, 2015* -
## Math

An ice cream store sells 30 different flavours of ice cream and it offers a choice of 3 different kinds of cones. In how many ways can we order a dozen two-scoop ice cream cones if any two of them in one order must differ at least by a flavor or by the

*asked by Excel on April 9, 2015* -
## math

*asked by Excel on April 9, 2015* -
## Math

*asked by Excel on April 10, 2015* -
## Statistics

Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of 32 months before certain electronic components deteriorate, causing the watch to become unreliable. The standard deviation of

*asked by Amy on November 17, 2016* -
## astronomy

The luminosity of the Sun is 4*10^33 erg/s, and its radius is 7*10^10 cm. You are tasked with building a solar power plant in the Arizona desert, using solar panels with 10% efficiency. How large an area (km^2) must your solar panels cover to match the

*asked by Tsambikos on October 1, 2015* -
## science

The following statement is a vaild scientific theory. If Watson and Crick had not discovered the structure of DNA, bio - technology would be 20 years behind where it is today. TRUE FALSE true

*asked by pam on September 6, 2010* -
## History

Is anyone available to help me? I need to create a metaphor to describe the structure of our federal government The example they provided is "The American Government is a tripod; without each post, it would collapse." I can't find anything that fits very

*asked by Abby on October 2, 2015* -
## english

By adding sentence variety in writing you can give it life and rhythm. Your readers can be bored by reading too many sentences with the same structure and length. It can grow to be monotonous for readers.

*asked by jessica on October 19, 2010* -
## Chemistry

Iron crystallizes in a body–centered cubic structure. The volume of one Fe atom is 9.38 x 10–24 cm3, and the density of Fe is 7.874 g/cm3. Find an approximate value for Avogadro’s number.

*asked by Ian Palen on December 9, 2012* -
## Chemistry

For acids of the same general structure but differing electronegativities of the central atoms, acid strength decreases with increasing electronegativity of the central atom. True or false

*asked by Josh G. on November 15, 2012* -
## Math

Using the term structure in Problem 29 what is the present value of an investment that pays $100 at the end of each of years 1., 2. and 3? If you wanted to value this investment correctly using the annuity formula which discount rate should you use?

*asked by J on June 7, 2014* -
## geometry

sodium has a body-centered cubic structure with a unit cell that is 430 picometers wide. estimate the radius of a sodium atom. please help me, I don't know how to get the solution. THank you

*asked by lin on January 28, 2013* -
## AP CHEM

A secondary alcohol results from the attachment of a hydroxy group to which carbon atom? C |

*asked by Anonymous on April 5, 2013* -
## Organic cChemistry

For each pair of molecules or ions, select the stronger base and write its lewis structure a) CH3S- or CH3O- b) CH3NH- or CH3O- c) CH3COO- or OH- d) CH3CH2O- or H- e) NH3 or OH- I would really appreciate the help!

*asked by Kourtnei on October 10, 2013* -
## science

The following statement is a vaild scientific theory. If Watson and Crick had not discovered the structure of DNA, bio - technology would be 20 years behind where it is today. TRUE FALSE true

*asked by pam on September 6, 2010* -
## Solar Energy Please Help

a) Family Smith has already installed PV in their house. Now, they also want to cover their needs for warm water with solar energy. For this, they consider having a solar thermal water heating system. Considering that the need for warm water is 100L/day,

*asked by Anonymous on October 26, 2013* -
## mgt/230

what is the relationship between organizational structure and organizational function? help please?

*asked by ann on October 23, 2011* -
## science

What is the meaning of cell structure because i can't find the meaning anywhere.

*asked by saiyda on January 27, 2010* -
## Science

Please help me with my sciene? Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a

*asked by eannaL on September 15, 2016* -
## ECONOMICS

The following table illustrates the points a student can earn on examinations in economics and biology if the student uses all available hours for study. Economics Biology 100 40 90 50 80 60 70 70 60 80 50 90 40 100 Plot this student’s production

*asked by RAYNE on September 14, 2011* -
## English

Feminists argue that since the past millennium in the West have been dominated by men-whether they be politicians in power or the historians recording it all - Western literature reflects a masculine bias.and consequently, represents and inaccurate and

*asked by Jessica on January 10, 2015* -
## biology

Allegra is a blockbuster allergy medication that generated over $1.8 billion in global sales in 2004. Allegra, or Fexofenadine, decreases allergy symptoms by inhibiting the action of histamines. Histamines are naturally occurring molecules that are

*asked by selly on March 12, 2013* -
## Physics

If the distance between two slits is .05mm and the distance to the screen is 2.5m find the spacing between the first and second order bright fringees for yellow light of wavelenght 600nm. d=5x10^-5m L=2.5m wavelength= 6x10^-7m x=? x=wavelength*L/d

*asked by Jason on April 23, 2008* -
## science - atoms and bonds

#1) Draw the following ions using a Bohr diagram: b)oxygen: i got [oxygen:2)8)]-2 (the -2 is an exponent) but the answer said [oxygen: 2)8)8)]-2...is this right? d)fluorine: i got [fluorine:2)8)]-1 and the book says [fluorine: 2)8)8)]-1..again, is the book

*asked by Sarah on May 10, 2008* -
## Business Communication

Will someone look over my answers and think this is okay? The assignment is and I'm suppose to find the strengths and weaknesses. I am a new publisher with some really great books to sell. I saw your announcement in Publishers Weekly about the bookseller's

*asked by Cupcake on November 23, 2007* -
## algebra

Consider the equation 7x + 3y = 42. Part 1: On your own paper, graph this equation using the slope-intercept method. In the space provided, explain, in words, each step of the procedure you used. Make sure to use complete sentences and correct grammar. (3

*asked by Ka'Sandra on August 11, 2010* -
## Algebra

Consider the equation 5x + 2y = 30. Part 1: On your own paper, graph this equation using the slope-intercept method. In the space provided, explain, in words, each step of the procedure you used. Make sure to use complete sentences and correct grammar. (3

*asked by Heather on November 15, 2010* -
## chemistry

a. Listening to the weather report, you hear that the barometer is falling. What part of the barometer is falling? The level of mercury is falling. b. What is happening to the air pressure? The air pressure is decreasing.

*asked by krystal on February 22, 2012* -
## PHYSICS!!

(a) Suppose 10 astronauts are sent to Mars and then back to Earth. The average power usage of each astronaut is 10,000,000 joules per day. What is the average power usage of each astronaut in watts and horsepower? (b) It will take approximately 2 years for

*asked by tom on April 11, 2016* -
## PHYSICS HELP!!

(a) Suppose 10 astronauts are sent to Mars and then back to Earth. The average power usage of each astronaut is 10,000,000 joules per day. What is the average power usage of each astronaut in watts and horsepower? (b) It will take approximately 2 years for

*asked by Ben on April 12, 2016* -
## Operations management

Tax Preparers Inc. works 250 days per year. The company uses adding machine tape at a rate of eight rolls per day. Usage is believed to be normally distributed with a standard deviation of three rolls during lead time. The cost of ordering the tape is $10

*asked by Patrice on March 2, 2012* -
## 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

*asked by Nella on January 10, 2011* -
## math

the roller coaster has two seats in each of 12 rows. Riders are assigned to seats in the order they arrive. if you ride this roller coaster once, what is the probablilty of getting coveted first row? How many times must you ride in order to have atleast a

*asked by jasmine on September 28, 2007* -
## Chemistry Please Help!!!

Airbags contain a mixture of sodium azide, potassium nitrate, and silicon dioxide. A sensor detects a head on collision that cause the sodium azide to be ignited and to decompose forming sodium and nitrogen gas. This gas fills a nylon or polyamide bag such

*asked by Annie on July 25, 2014* -
## physics

A man wished to travel due north in order to cross river 5kilometer wide flowing due east at 2kilometer per hour. If he can roll at 9kilometer per hour in still water, find 1. The direction in which he must head his boat in order to get to his destination

*asked by ayomide on June 8, 2015* -
## physics- please check

a. Two sticks are rubbed together to start a fire. b. A firecracker explodes. c. A red-hot iron bar is set aside to cool. In which of the situations listed above is energy being transferred as heat to the system in order for the system to do work? I would

*asked by Anonymous on February 4, 2007* -
## Physics

Sorry for reposting this but I'm still confused with the last part... You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the

*asked by Catherine on May 9, 2011* -
## Physics

You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International Space Station. Due to mishandling of units by a

*asked by Catherine on May 8, 2011* -
## Stats

Suppose a Normal model describes the fuel efficiency of cars currently registered in your state. The mean is 27 mpg, with a standard deviation of 4 mpg. Describe the mileage of the most efficient 3% of all cars. a. greater than 24.9 mpg b. greater than

*asked by Ali on July 29, 2016* -
## Science

A person performs a work task at a mechanical efficiency of 20 percent and at total energy output of 15kcal/min. How much energy(kcal/min) is lost as heat? and how much energy(kcal/min) is used to actually perform the work?

*asked by Sam on February 29, 2012* -
## Kinesology

A person performs a work task at a mechanical efficiency of 20 percent and at total energy output of 15kcal/min. How much energy(kcal/min) is lost as heat? and how much energy(kcal/min) is used to actually perform the work?

*asked by Sam on February 29, 2012*