1. thermodynamic

    an engine operates on the carnot cycle between the temperature limits of 250c and 50c. the pressure and the volume at the start of the isothermal expansion are 6 bar and 0.1 m^3 respectively. pressure after isothermal expansion is 3 bar. assume

    asked by abody alabady on April 9, 2015
  2. Calculus

    y=x^3-3x. Fill out the following table and then make a rough sketch of the graph. I can make the sketch just having trouble understanding what is wanted. y=0 when y'=0 when Relative Max(s) Relative Min(s) y'>0 on the interval(s) y'

    asked by Kieran on October 2, 2012
  3. calculus

    I don't understand how to do this? I don't know the steps on how to do it! Can you please just tell me the steps? Find the intervals on which the function is increasing and decreasing. g(x) = x√((8-x)^2) (also, what is the difference between local

    asked by Desperado on January 11, 2010
  4. Math

    For the function y= (ax+b)/(cx+d) write the intervals where the function is increasing and intervals where it is decreasing. X intercept= -b/a Y intercept= b/d Vertical asymptote: x=-d/c Horozontal asymptote: a/c

    asked by Hyde on March 31, 2014
  5. Chemistry(Please check)

    1) The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I - = H2O + IO - (slow) H2O2 + IO - = H2O + O2 + I - (fast) Which

    asked by Hannah on February 25, 2012
  6. Chemistry(Please check)

    1) The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I - = H2O + IO - (slow) H2O2 + IO - = H2O + O2 + I - (fast) Which

    asked by Hannah on February 25, 2012
  7. Chemistry(Please check answers)

    1) The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I - = H2O + IO - (slow) H2O2 + IO - = H2O + O2 + I - (fast) Which

    asked by Hannah on February 26, 2012
  8. IT

    could someone please explain to me a how a business would benefit from Expert systems or even an example would help Thank you for using the Jiskha Homework Help Forum. In any business organization and efficiency are important. Check these sites for

    asked by Ray on June 14, 2007
  9. Science

    . A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? A. Test extracts from newly discovered plants for pain-killing substances. B. Read anthropological

    asked by Dulce on July 17, 2014
  10. Science

    . A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? A. Test extracts from newly discovered plants for pain-killing substances. B. Read anthropological

    asked by Dulce on July 28, 2014
  11. Science

    A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? A. Test extracts from newly discovered plants for pain-killing substances. B. Read anthropological

    asked by Dulce on July 13, 2014
  12. English

    Hello. Please check the structures: He and his wife didn't have bank accounts. He or his wife didn't have... Both he and his wife didn't have... Neither he nor his wife had ... THANK YOU FOR HELP.

    asked by Ilma on April 25, 2011
  13. calc 3

    The length script l, width w, and height h of a box change with time. At a certain instant the dimensions are script l = 7 m and w = h = 5 m, and script l and w are increasing at a rate of 6 m/s while h is decreasing at a rate of 4 m/s. At that instant

    asked by Becky on September 21, 2012
  14. health

    I am going to be making a power presentation on the RED CROSS, I am a little stuck on the following section, describe national incident command structure, I have been looking it up on the internet, and the results that I am recieving are to inroll in there

    asked by linda on February 4, 2010
  15. Basic English

    9. Which of the following sentences contains a comma splice? A. Our friend, who travelled from Tennessee, was quite tired when he arrived. B. The kitten climbed the drapes, it couldn't figure out how to get down. C. The cruise ship docked on Oahu, then

    asked by Anna on March 18, 2014
  16. English

    I am assigned to write a formal essay focusing on the theme of "Mrs Turner Cutting the Grass". Are job is to support our argument with any of the following: plot structure, symbolism, irony, humour, pathos, style or foreshadowing. How do I go about this?

    asked by Karen on March 25, 2010
  17. tefl course

    Structure an ESA (boomerang pattern) based lesson for a pre-intermediate class, teaching language commonly used for shopping, so that students can ask for, find the price for and purchase everyday food and clothing items:

    asked by rahila on November 26, 2010
  18. physical science

    The exact question how are the following terms related - subatomic particels and atomic mass unit. The heading on the page is review and reinforcement structure of an atom - the three main subtomic particles are the proton, the nuetron and the electron.

    asked by liz on November 5, 2007
  19. Chemstry

    What is the structure of N4O, where the 3 nitrogen bonds have different bond lengths and the N=O bond is a double bond. I just don't get it

    asked by Phil on November 9, 2010
  20. Math

    The market trades in three fixed-income securities: A, B, and C. Security A is a 2-year bond paying 40 at date 1 and 80 at date 2. Security B is a 1-year bond paying 50 at date 1. Security C pays 30 at date 1 and 40 at date 2. Prices are pa=100, pb=45 and

    asked by Lou on October 28, 2011
  21. History After 1945

    Describe the social structure and lifestyles of the 1960s Counterculture. How did the Vietnam War influence the Counterculture? Do you think there is a counterculture today? Explain your answer.

    asked by Cace on March 28, 2009
  22. Science

    A dicot seed is preferred over a monocot seed to observe seed structure because? a.Distinct embryonic axis or b.Proper sepration of cotyldeons

    asked by Mona on March 15, 2015
  23. history

    Describe the social structure and lifestyles of the 1960s Counterculture. How did the Vietnam War influence the Counterculture? Do you think there is a counterculture today? Explain your answer.

    asked by scooby91320002 on July 31, 2009
  24. CJS 240

    what are any program-federal, state, or local that emplifies the concept of social structure, social process or social conflict theories? Or any references would be even better.

    asked by sasha on April 17, 2010
  25. English Improving writing

    Below is what I have to do for English It is very confusing to me General Instructions Single –space your prewriting, but double space your drafts. After preparing a rough draft read the evaluation criteria and revise your work carefully, correcting any

    asked by Kaleigh-Anne on June 9, 2008
  26. math

    The order of magnitude of the radius of our solar system is 10 to the 13th power meters. the order of magnitude of the radius of the visible universe is 10 to the 13th power times as great. find the approximate radius of the visible universe. can anyone

    asked by Marie on February 17, 2012
  27. math

    SOMEBODY PLEASE HELP ME!!!I CANT FIND TESSELATION.PLEASE HELP. The word is tessellation. If you had read my response to your original question you would have known how to spell it. Go to www.google.com, type in anything close and it will ask you if you

    asked by vaneesa on October 15, 2006
  28. Calculus

    The voltage,V, in an electrical unit is related to the current,I, and the resistance,R, by the equation V=IR. The current is decreasing at -4amps/sec as the resistance increases at 20ohms/sec. How fast is the voltage changing when the voltage is 100 volts

    asked by Luis on December 14, 2009
  29. physics

    A certain elevator car has mass 2200 kg and is lifted by cables driven by an electric motor. The efficiency of the lift system (motor, pulleys, cable, etc.) is 67.0%. As the elevator car moves at constant speed of 3.0 m/s it encounters 220N of friction

    asked by Bob on December 2, 2013
  30. Physics

    As an environmentally friendly idea, some have proposed using the temperature gradient of the ocean to generate electricity. This system would use the temperature gradient between the surface of the ocean (at about 200 C) and the water temperature at a

    asked by Anonymous on June 16, 2016
  31. physics

    As an environmentally friendly idea, some have proposed using the temperature gradient of the ocean to generate electricity. This system would use the temperature gradient between the surface of the ocean (at about 200 C) and the water temperature at a

    asked by Anonymous on June 16, 2016
  32. Physics

    Hey, have a question in Physics From a power magazine released 300,000 gallons of water pr.sekund into a pipeline leading to a turbine plant. Height difference between the magazine and the turbines are 300meter. The turbines provide 0.7 GW power. How large

    asked by Oddbjørn on November 22, 2010
  33. IB Chemistry

    Which statements are correct for an endothermic reaction? I. The system absorbs heat. II. The enthalpy change is positive. III. The bond enthalpy total for the reactants is greater than for the products. A. I and II only B. I and III only C. II and III

    asked by chirikamo on March 1, 2013
  34. calculus

    let f(x) = 2x^5-5x^4 find open intervals on which f is a) increasing b)decreasing Find values of x at which f has c) relative max and min find open intervals d) concave upward e) concave downward c) find the inflection points of f

    asked by Martha on November 5, 2012
  35. Physics

    Calculate the magnitude of the magnetic field at a point 43.6 cm from a long, thin conductor carrying a current of 1.24 A. The permeability of free space is 1.25664 × 10^−6 T · m/A. Answer in units of T

    asked by Like a Boss on April 22, 2013
  36. Geography and Society

    What is the primary function of Earth's atmosphere? a. to trap heat from the sun b. to shield the planet from harmful radiation*** c. to disintegrate space debris before it reaches the surface d. all of the above

    asked by Kaai97 on March 1, 2016
  37. Physics!

    Consider someone in a rotating space habitat. The outward force felt by the person A.has no reaction counterpart B.is an interaction with Earth C.is a form of gravity D.is real in the traditional sense

    asked by Anonymous on March 20, 2014
  38. algebra

    I don't quiet know where to start can anyone help guide me? Bonnie has a container in the shape of rectangular pyramid. The formula for the surface area of the enclosed space is S=lw+0.5Ph. Solve for P? P= S - lw- 0.5h P= S + lw + 0.5h P= S-lw/ 0.5h P=

    asked by kat on October 6, 2015
  39. Science-QUICKLY PLEASE!!

    3. Which of the following projects is a good example of the current cooperation between nations for the furthering of scientific research? a. International Space Station b. NAFTA c. Hoover Dam d. Panama Canal please help!!!!!

    asked by Ashley on November 25, 2009
  40. science

    i need help what do astronauts eat, drink when in space???? sanitation??? health???? exercise??? sleep?????how do they do all of this http://www.pbs.org/spacestation/station/living_sanitation.htm

    asked by tita on March 8, 2007
  41. Physics

    Suppose the surface (radius = r) of a cylindrical space station is rotating at 29.1 m/s to provide artificial gravity. What must be the value of r for the astronauts to weigh 1/3 of their earth weight? Don't know how to start please help.

    asked by S on October 21, 2014
  42. physics

    two charge 5NC and -2NC are placed at a point (5cm,0,0)and (23cm,0,0)in a region of a space where there is no other electric field.calculate the electrostatic potential energy of this charged system

    asked by prachi on April 27, 2013
  43. Physics

    If a cylindrical space station 300 {\rm m} in diameter is to spin about its central axis, at how many revolutions per minute ({\rm rpm}) must it turn so that the outermost points have an acceleration equal to g?

    asked by Bronson on June 11, 2011
  44. Art

    Sketchbook 7 by Vivian W. Which element did this artist use most to emphasize her original creation of a cotton candy creature? A. negative space B. color C. line D. texture Is the answer C?

    asked by Callie on November 19, 2014
  45. Physics

    If a cylindrical space station 300m in diameter is to spin about its central axis, at how many revolutions per minute rpm must it turn so that the outermost points have an acceleration equal to g?

    asked by Carmen on November 11, 2010
  46. chemistry

    explain what is meant by the term 'Hybridisation' in molecular orbital theory and show how the concept can be used to explain the structure and bonding in ethane C2H6 ETHENE C2H4 AND ETHYNE C2H2

    asked by rebecca on December 13, 2011
  47. ENG125

    how is the more direct performative aspect of drama and /poetry reflected in these forms? for example, each genre's uses of literary structure, language, technique, and style. How do these literary elements affect your reading experence?

    asked by bonnie on September 2, 2011
  48. Chemistry

    Describe 3 experiments, run prior to 1930, and the types of energies/particles used to probe the structure of the atom. What did each experiment investigate? Include the names of the scientists associated with each experiment in your answer.

    asked by Anonymous on July 1, 2015
  49. english

    what is isolating morphology? What is agglutinating morphology? thanks a lot! =) Variations in the study of word structure: http://www.lang.ltsn.ac.uk/resources/goodpractice.aspx?resourceid=319 =)

    asked by jules on April 28, 2007
  50. psychology

    language structure is important in cognition, but is it really? For example, if a child said to you, "You, me, cookie, go now, hurry," you would know what the child meant even thought it is not grammatically correct, how is that possible? Please note that

    asked by missy on December 7, 2010
  51. A LEVEL LAW

    where can we students find the best answers attempted by the highest scorers in past years on A level Law exam? can we get any clear answer structure which helps us know how to attempt an A grade answer?

    asked by fahmida on March 25, 2011
  52. Bio(its urgent!)

    according to cell theory, the cell is the basic unit of structure and function in the body. in two or more sentences, explain how this fact relates to the need for digestion. please i help! i have searched the sites but cannot find a answer...... plz help!

    asked by Anonymous on November 12, 2008
  53. social studies

    What is the order in which the caste system has changed in India? Place the first development at the top and the most recent developments at the bottom. 1. Castes are rigid and inflexible; people are born into a caste and cannot leave it. 2. Discrimination

    asked by Susan on October 9, 2018
  54. Math (Calculus)

    The function f(x)=-2x^3+10.2x^2+202.275x+0.87 is increasing on the open interval (?,?). It is decreasing on the open interval (-oo,?) and the open interval (?,+oo) The function has a local maximum at ? I used derivative -6x^2+20.4x+202.275 and find the

    asked by Anonymous on April 22, 2016
  55. Physics

    a shaft rotation @ 800 rpm delivers a torque of 240 N.m to an output shaft that is rotating @ 200 rpm. a. if the efficiency of the machine is 70%, compute the output torque b, what is the output power e=Po/Pi .7=x/240 N.m = 168 N.m this is not the answer

    asked by Jeannine on April 4, 2011
  56. Laws of Physics

    A block and tackle has a velocity of 6 and it is being used to raise a mass of 68 newtons through 3 meters. The efficiency is 60% Calculate the amount of energy needed to lift the mass through 3 meters and calculate the amount of energy that was put into

    asked by Laura on February 18, 2017
  57. Science

    Which explains the greenhouse effect? A. Greenhouse gases like water vapor and carbon dioxide trap heat in the atmosphere, thereby radiating heat energy back into space. B. Greenhouse gases like water vapor and carbon dioxide release heat in the

    asked by Anonymous on January 29, 2015
  58. math

    You have been appointed by the new executive director to chair a committee of agency administrators charged with (1) conducting an inventory of the agency’s various services and activities, (2) recommending a program structure, and (3) recommending

    asked by amber on September 27, 2008
  59. 4 CALCULUS study problem

    1. How fast does the radius of a spherical soap bubble change when you blow air into it at the rate of 15 cubic centimeters per second? Our known rate is dV/dt, the change in volume with respect to time, which is 15 cubic centimeters per second. The rate

    asked by Samantha on January 9, 2014
  60. math

    A store has 300 televisions on order and 80% are high definition. How many televisions on order are high definition?

    asked by makenzey on January 28, 2015
  61. Biochem

    Computers English Foreign Languages Health Home Economics Math Music Physical Education Science Social Studies GRADE LEVELS Preschool Kindergarten Elementary School 1st Grade 2nd Grade 3rd Grade 4th Grade 5th Grade 6th Grade 7th Grade 8th Grade High School

    asked by Pop on November 13, 2014
  62. physics

    why does an ideal fluid move faster through a pipe with decreasing diameter? a. the pressure within the fluid increases b. the pressure within the fluid decreases c. the pipe exerts more pressure on the fluid d. the fluid moves downhill

    asked by y912f on February 18, 2009
  63. physics

    A mass of 0.04 kg is attached to a cord passing through a small hole in a frictionless, horizontal surface. The mass is initially orbiting with speed 4.9 m/s in a circle of radius 0.4 m. The cord is then slowly pulled from below, decreasing the radius of

    asked by will on October 19, 2011
  64. Physics

    A mechanic uses a chain and block to lift a 875-kg engine 4.00 m to the top of the garage. The downward force in the chain over the 4.00 m distance is 5.00 x 10^4 N. A) Calculate the work done in raising the motor B) How much useful work was done? C) What

    asked by Holly on January 16, 2014
  65. physics

    Just like the efficiency can be used to tell how 'good' an engine is, the Coefficient of Performance can be used to compare refrigerators. If a refrigerator requires 1.21×104 J of work to remove 3.23×104 J of energy from the inside of a refrigerator,

    asked by taylor on November 28, 2016
  66. science (check!)

    Which experimental approach would be most effective and easiest to clearly determine the evolutionary relationship between the starfish and green snake? a. sequence the same gene in both species to compare their similarity. b. dissect specimens of both

    asked by Me on June 3, 2014
  67. chemistry

    The skeletal structures of the two amino acids, glycine and lysine, are given below along with the values of the relevant acid dissociation constants (pKa). (b) Calculate the pI (isoelectric point) of the dipeptide, Lys-Gly, assuming that there is

    asked by bonjo on June 1, 2013
  68. law

    Ron supervises delivery of flowers for a wholesale distributor of fresh flowers, Flowers. Inc. In order to accommodate one of the company’s best customers, Ron offers to immediately rush a delivery of fresh peonies. All of the delivery trucks are

    asked by Anonymous on February 2, 2014
  69. 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,

    asked by nuts on April 19, 2014
  70. Physics

    The escape velocity on Planet X is the speed the rocket needs in order to never fall back down again in a universe in which X is the only object. In order for the rocket to not fall back down, its velocity to never become negative, how far away does the

    asked by Scoop on October 30, 2012
  71. Computer Programming using python

    Assume s is a string of lower case characters. Write a program that prints the longest substring of s in which the letters occur in alphabetical order. For example, if s = 'azcbobobegghakl', then your program should print Longest substring in alphabetical

    asked by Anonymous on October 24, 2013
  72. chemistry

    An element with body centred cubic structure.Edge length is 400pm.Calculate the density of element.Atomic Mass of element is 100u?

    asked by Aarathy on July 13, 2013
  73. Chemistry

    An element has a body centred cubic structure with edge cell of 288 pm .The density of the element is 7.2 g/cm3.How many atoms are present in 208g of the element.

    asked by Raynold on November 8, 2012
  74. physics

    In space, an object has only ONE force acting on it. Can the object have constant acceleration and/or a velocity of 0. Explain.

    asked by sally on June 20, 2014
  75. Physical Science

    A 75 kg astronaut in space pushes against a 200 kg navil. when the astronaut lets go of the anvil pushing it:

    asked by brandi on December 13, 2011
  76. Physics

    The space shuttle is in a 200-mile-high orbit. What is the shuttle's orbital period?

    asked by mike on October 27, 2010
  77. Physics

    If the electric field is zero everywhere inside a region of space, the potential must also be zero in that region. TRUE or FALSE, WHY?

    asked by Bano on February 14, 2014
  78. science

    Two copper globes are floating in space with a charge of -10 and charge of +16. They come together then go back apart. What are the resulting charges

    asked by christy on March 24, 2017
  79. science

    A point charge of 0.5C is brought from infinity to a point A in free space.how much work is required to this?

    asked by benjamin on October 10, 2014
  80. Educational Tech

    Which of the following elements of design is the only element that is not added to a design? 1) Typography 2) Shape 3) Color 4) Space

    asked by @AmeliaTheGamer on April 24, 2017
  81. Physics

    A spaceship travels through space at a constant velocity of 3.00 x 10^2 m/s. What is the net force acting on the spaceship?

    asked by Student12 on March 19, 2017
  82. math

    The question is 24 (-6)-1/-5 I don't understand what you do with the 24. I got -145/-5=29 I multiplied 24 by -6 but I don't think this is right there is a big space between the 24 and the other numbers.

    asked by Cherie on October 12, 2012
  83. linear algebra urgent

    Use the Gram-Schmidt process to transform the basis 1 1 1 , 0 1 1 , 2 4 3 for the Euclidean space R3 into an orthonormal basis for R3.

    asked by sara on April 10, 2015
  84. math

    suppose n points are in space, no three are collinear and no four or are coplanar. How many tetrahedral can be formed with these points as vertices? 1/24 *n*(n-1)*(n-2)*(n-3)

    asked by Blonde Glamour on December 21, 2006
  85. CDA

    Licensing requirements ensure minimum A. space. B. children. C. requirements. D. standards. My answer is C

    asked by Kaleisha on April 1, 2015
  86. math

    You own 19 CDs. You want to randomly arrange 9 of them in a CD rack. What is the probability that the rack ends up in alphabetical order? The probability that the CDs are in alphabetical order is ?

    asked by hana on November 9, 2015
  87. AP Calculus

    The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second? a. -(0.2)pie C b. -(0.1)C c. -(0.1)C/2 pie d. (0.1)^2C e.

    asked by Naz on January 19, 2011
  88. AP Calculus

    The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second? a. -(0.2)pie C b. -(0.1)C c. -(0.1)C/2 pie d. (0.1)^2C e.

    asked by Naz on January 18, 2011
  89. Math

    The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second? a. -(0.2)pie C b. -(0.1)C c. -(0.1)C/2 pie d. (0.1)^2C e.

    asked by Naz on January 19, 2011
  90. business

    1 for a large company stock/mutual fund would you expect the betas to be positive or negative for each of he factores in a fama french multifactor model? 2 What do you observe abouth the bata coefficients for the different mutual funds? comment on any

    asked by Ann on February 17, 2013
  91. Economics~~URGENT!!!

    i am not a spoon feeder, i just don't have any idea about these messy questions. 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

    asked by zhuie on September 3, 2008
  92. Economic - Cost and benefit analysis

    i am not a spoon feeder, i just don't have any idea about these messy questions. 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

    asked by zhuie on September 3, 2008
  93. PHYSICS

    1) A diffraction grating with 2.500 x 10^3 lines/cm is used to examine the sodium spectrum. Calculate the angular separation of the two closely spaced yellow lines of sodium (588.995 and 589.592) in each of the first three orders. 2) A diffraction grating

    asked by Anonymous on October 23, 2008
  94. Linear Algebra

    V = Mnxn is a space vector formed by all the square matrices. Is W = {A in Mnxn : A^x = A} a subspace of V? Thanks

    asked by Isaac on May 2, 2009
  95. guess and check sheet

    denzil list starts with the light show. Could the list start with the space first?

    asked by shaniah on January 9, 2012
  96. probability

    Let A and B two mutually exclusive events of a sample space S. If P(A)=0.6, P(B)=0.2 , find the probability of each of the following events a)P(A ∩ B)

    asked by anonymous on July 26, 2010
  97. earth

    give two examples of how exploring space and exploring the ocean depths are similar

    asked by Anonymous on August 23, 2008
  98. Astronomy Grade 9( PLEASEEE HELP!!!!!!!!!!!!!!)

    What hazards do humans face when they are in space and what technologies have been developed in response to these hazards?

    asked by Curly Sue on November 30, 2012
  99. Exploring Space

    What force musst be overcome to a launch a vehicle into space? Would that force be weight?

    asked by Sara on March 15, 2010
  100. To Henri - applied mechanics

    When you re-post, be sure to put the SUBJECT AREA in the space marked SCHOOL SUBJECT. Thanks.

    asked by Writeacher on April 19, 2009