1. physics

    How many grams of carbohydrate does a person of mass 75 kg need to metabolize to climb five flights of stairs (15 m height increase)? Each gram of carbohydrate provides 17.6 kJ of energy. Assume 10.0% efficiency—that is, 10.0% of the available chemical

    asked by Nasir on June 8, 2012
  2. 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

    asked by Matt on April 8, 2011
  3. Melting point

    Do you have any idea what the melting points and range might be for a 50/50 mixture of: 1. Benzoin (M.P.: 135-136) and succinimide M.P.: 121-123 and 2. Benzoic acid M.P.: 121-122 and succinimide M.P.: 122-124 I'm doing a lab with really laughable melting

    asked by Sheryl on October 1, 2006
  4. C++ programming computer

    I'm having some trouble trying to program these problems and putting them into the main function. Please help me by giving some advice or website that offer good information for me. The questions are below here: 1. Write a function that accepts a string of

    asked by Milo on April 13, 2011
  5. 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

    asked by Owen on October 22, 2012
  6. 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

    asked by Danny on May 11, 2013
  7. Algebra

    The power P (in watts) generated by a windmill that has efficiency E is given by the formula P = 0.31ED^2V^3, where D is the diameter (in feet) of the windmill blades and V is the wind velocity (in ft/sec). Approximate the wind velocity necessary to

    asked by Ashton on September 24, 2014
  8. CHEMISTRY HELP !!!!

    Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36 hours, what mass of aluminum is deposited at the electrode? Assume 100% current efficiency. a. 9.2 x 10–3 g b. 3.3 x 101 g c. 9.9 x 101 g d. 1.0 x 102 g e. 3.0 x 102 g

    asked by Anonymous on May 7, 2014
  9. Science: Physics

    We use an electric immersion heater to heat 2,0 liters water having temperature of 20C to the boiling point. Specific heat capacity of water is 4,19 kJ/(kg c). The power of the heater is 1,50 kW and efficiency of heating is 80 %. How much time does the

    asked by karem on December 22, 2016
  10. Chemistry

    My chemistry teacher said that the pCO2 value increases during hypoventilation. Why is that? If hypoventilation causes shortness of breath, would that not increase the CO2 concentration, therefore decreasing pCO2? Because if you think about pH, a larger H

    asked by Bobby on March 11, 2012
  11. Chemistry

    My chemistry teacher said that the pCO2 value increases during hypoventilation. Why is that? If hypoventilation causes shortness of breath, would that not increase the CO2 concentration, therefore decreasing pCO2? Because if you think about pH, a larger H

    asked by Bobby on March 11, 2012
  12. calculus

    the volume of a rectangular box with a square base remains constant at 500 cm^3 as the area of the box increases at a rate of 3cm^2/sec. find the rate at which the height of the box is decreasing when each side of the base is 18 cm long.

    asked by Anonymous on May 5, 2011
  13. calculus

    The Voltage v , Current I and Resistance R are related by the equation V=IR. Suppose that V is increasing at a rate of 2 volt/sec, while I is decreasing of the rate of 1/5 (amp/sec ). Let t denote time in seconds. Find the rate at which R is changing when

    asked by maria on November 8, 2014
  14. calculus

    The Voltage v , Current I and Resistance R are related by the equation V=IR. Suppose that V is increasing at a rate of 2 volt/sec, while I is decreasing of the rate of 1/5 (amp/sec ). Let t denote time in seconds. Find the rate at which R is changing when

    asked by Maria on November 8, 2014
  15. College Algebra

    A cars value is declining exponentially. The car is currently 3 years old and has a value of 18,000. The car sold for 26,000 brand new. Find the rate at which the value of the car is decreasing. So far my equation is 18,000=26,000 (3-.04)^the But I'm not

    asked by Austin on April 22, 2016
  16. Calculus

    A rectangle is 2 feet by 15 inches. Its length is decreasing by 3 inches/minute and its width is increasing at 4 inches/minute. How fast is the a) perimeter changing b) area changing

    asked by Anonymous on November 2, 2014
  17. Chemistry

    consider the equation for the following reaction at equilibrium. X+Y2Z+heat the concentration of the product could be increased by 1.adding a catalyst 2.adding more heat to the system 3.increasing the concentration of Y 4.decreasing the concentration of X

    asked by Jazmin F. on March 9, 2011
  18. precalc

    For the graph y=2, what is the: A) Domain B) Range C) X values of all zeroes D) Equations of all asymptotes E) 1 to 1 or not F) Continuous or not (if continuous tell where) G) Increasing, decreasing, both (if both tell where), or neither H) Bounded above,

    asked by u on September 3, 2015
  19. chemistry

    Identify the true statement(s) regarding the entropy of chemical substances. a. All pure substances have a positive entropy at room temperature. b. The dissolution of an ionic salt in water usually leads to an increase in entropy of the system (salt +

    asked by Anonymous on November 23, 2008
  20. Agosec Ghana

    a machine was used to lift a load of 30N through a distance of 2metres. the effort applied was 10N through a distance of 8metres. calculate the. A) mechanical advantage B) work input of the machine C) work output of the machine D) the efficiency of the

    asked by Phidelis on June 25, 2015
  21. chem

    A certain first-order reaction has a rate constant of 2.75 10-2 s−1 at 20.°C. What is the value of k at 50.°C if Ea = 75.5 kJ/mol? i know to use the ln(k1/k2)= (ea/R)((1/T1)-(1/T2)) but how do i know what T2 is when i only have one temp? there is a b

    asked by Hannah on February 10, 2013
  22. french - reflexive verbs

    the word order for past tense is je ne me le lui y en ai pas donné but when you're using reflexive verbs for past tense its "je me suis" does the suis incorporate into the word order?

    asked by paul on November 3, 2008
  23. Shalee ^~^

    1) Which of the following statements about the sun's structure is true? The sun has a solid surface The sun has an interior and an atmosphere The sun's interior is similar to the Earth's; it has a core, mantle, and crust*** The sun's outermost layer is

    asked by Shalee ^~^ on October 7, 2015
  24. Science

    1) Which of the following statements about the sun's structure is true? The sun has a solid surface The sun has an interior and an atmosphere The sun's interior is similar to the Earth's; it has a core, mantle, and crust*** The sun's outermost layer is

    asked by Shalee ^~^ on October 7, 2015
  25. math

    An efficiency expert has calculated that about 9.5% of the articles produced in a manufacturing plant are defective. This is equivalent to expressing the defective articles as a. 9 out of 15 b. 9 out of 50 c. 10 out of 95 d. 19 out of 100 e. 19 out of 200

    asked by thomas on April 9, 2014
  26. Physical Geography SOMEONE PLEASE HELP!

    Assume that a parcel of air is forced to rise up and over a 6000-foot-high mountain. The initial temperature of the parcel at sea level is 76.5°F, and the lifting condensation level (LCL) of the parcel is 3000 feet. The DAR is 5.5°F/1000’ and the SAR

    asked by Sandra on June 8, 2012
  27. Physical Geography

    Assume that a parcel of air is forced to rise up and over a 6000-foot-high mountain. The initial temperature of the parcel at sea level is 76.5°F, and the lifting condensation level (LCL) of the parcel is 3000 feet. The DAR is 5.5°F/1000’ and the SAR

    asked by Sandra on June 7, 2012
  28. Physical Geography PLEASE HELP!

    Assume that a parcel of air is forced to rise up and over a 6000-foot-high mountain. The initial temperature of the parcel at sea level is 76.5°F, and the lifting condensation level (LCL) of the parcel is 3000 feet. The DAR is 5.5°F/1000’ and the SAR

    asked by Sandra on June 6, 2012
  29. Criminal Justice

    1. How do city police chiefs come to power? A. They are elected by voters in specific districts. B. They are appointed by the mayor or selected by the city council. C. They are promoted up through the rank system. D. They are appointed by the outgoing city

    asked by Amy on April 13, 2014
  30. Organic Chemistry

    Suggest structures for C10H14O; C10H16; C10H18; C10H16O3; C10H16O2 ; C12H22O2 in the following reaction schema: The UV/Visible spectrum for C10H14O exhibits a at 244 nm C10H16 + hot KMnO4 + H2SO4 → C10H16O3 C10H16O3 + Zn(Hg)/conc HCl → C10H18O2

    asked by chem on April 6, 2011
  31. science

    Which experimental approach would be the most effective and easiest to clearly determine the evolutionary relationship between these 2 organisms? The 2 organisms are a starfish and snake. A. Sequence the same gene in both species to compare their

    asked by brianna on May 5, 2014
  32. english

    Fix the underlined part in the sentence. This was an important question to Americans in the eighteen century. When they were ruled by Great Britain, and it is an important question today when countries find themselves controlled by more powerful outsiders.

    asked by Please check answers on February 16, 2018
  33. AP US History DBQ Question

    For my midterm I was given a list of DBQ topics that she will pick from to give to us. I wrote the question below and I don't have the documents yet, but I have a general outline and I'm hoping people on this site can give me opinions and some more

    asked by Belinda on January 25, 2007
  34. Physics

    We have a heat engine that produces 150 J of heat, does 40 J of work, and emits 110 J into another system. What is the efficiency of the heat engine? (show you work)

    asked by Mark on December 7, 2016
  35. 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?

    asked by Sung on May 12, 2009
  36. physics!

    howdy, just cant seem to get this question, can anyone express this question in words i can get?! thanks A sound wave of wavelength 0.8 m divides into two equal parts that recombine to interfere constructively, with the original difference between their

    asked by johnny on June 3, 2010
  37. 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

    asked by Sonya on December 4, 2011
  38. Chemistry

    b)Rubidium Express your answer in condensed form, in order of increasing orbital energy. c)Tellurium Express your answer in condensed form, in order of increasing orbital energy. d)Palladium Express your answer in condensed form, in order of increasing

    asked by Chironjit on November 26, 2012
  39. Caculas

    (Airplane & Radar) An airplane is flying (horizontally) at the height of 6 km on a flight path that will take it directly over a radar tracking station (on ground). If the distance D between the plane and the radar is decreasing at a rate of 300 km/hr,

    asked by matthew on December 16, 2011
  40. math

    A spring is attached to the ceiling and pulled 6 cm down from equilibrium and released. After 4 seconds the amplitude has decreased to 3 cm. The spring oscillates 15 times each second. Assume that the amplitude is decreasing exponentially. Find an equation

    asked by amira on November 2, 2015
  41. Airplane & Radar

    (Airplane & Radar) An airplane is flying (horizontally) at the height of 6 km on a flight path that will take it directly over a radar tracking station (on ground). If the distance D between the plane and the radar is decreasing at a rate of 300 km/hr,

    asked by math on December 15, 2011
  42. 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

    asked by new things on November 16, 2009
  43. algebra

    You are planning an ornamental garden that has a total area of 200 square feet. There are two sizes of ornamental plants you have chosen for your garden. Each small plant requires 2.5 square feet of space and each large plant requires 8 square feet of

    asked by eve on November 26, 2012
  44. math

    A car skids to a stop, leaving four skid marks with an average length (D) of 60 feet. The road is asphalt. Skid tests reveal a drag factor(f) of 0.75. Since all four wheels were braking, the braking efficiency (n) is 100% or 1.00. To the nearest mile per

    asked by Matthew on October 2, 2018
  45. science

    how come there is a blackout period when the space shuttle goes behind the moon? Is it because radio waves can be transmitted through a solid object or through a vacuum or why?

    asked by anonymous on January 1, 2011
  46. Science ASAP

    How does the C horizon form? A) color and chemistry B) texture and pure space C) decayed organic matter D) oil

    asked by Mileena on December 6, 2013
  47. about microsoft office word

    I'm typing my research paper and I'm going to indent the left,right, top, and bottom by 1 inches. what am i going to do? i have another question, how will I double space it?

    asked by james on May 15, 2008
  48. science

    earth appears to be mostly blue when viewed from space because it is mostly covered by ? a) water b) oxygen c) carbon dioxide d) ozone

    asked by victoria on November 8, 2013
  49. AP physics

    suppose that the surface (radius=r) of the space station is rotating at 35.8 m/s. what must be the value of r for the astronauts to weigh one-half their earth weight?

    asked by Leah- PLEASE HELP!!! :) on October 29, 2010
  50. statistics

    A and B are events defined on a sample space, with the following probabilities. Find P(A and B). (Give your answer correct to two decimal places.) P(A) = 0.5 and P(B | A) = 0.4

    asked by DeeDee on May 26, 2013
  51. physics

    Peter Pan is suspended in space. He throws an entire jar of pixie dust to his left. Which way does he move?

    asked by Anonymous on February 7, 2018
  52. math

    verify The set of all 2 × 2 invertible matrices with the standard matrix addition and scalar multiplication is a vector space or not?

    asked by tasbeer on October 31, 2017
  53. math

    A and B are events defined on a sample space, with the given probabilities. Find P(A and B). (Give your answer correct to two decimal places.) P(A | B) = 0.43 and P(B) = 0.75

    asked by DeeDee on May 28, 2013
  54. Accounting

    The company rents office space and on December 1 had paid 7200 to the landlord for 12 months' rent in advance.

    asked by Danielle on September 10, 2016
  55. Physics

    If a space station must "provide one sixth the magnitude of the acceleration due to gravity on Earth" Can I use 9.81ms^-2/6 or is that too simple? Thanks.

    asked by charlie on October 9, 2008
  56. geometry

    A number is selected at random from the set {2, 3, 4, … 10}. Which event, by definition, covers the entire sample space of this experiment?

    asked by cfd on July 24, 2014
  57. Science - Weather

    Describe what would happen to the temperature on Earth if the amount of energy reflected back to space a) increased to 80% b) decreased to 5%

    asked by Kate on May 22, 2009
  58. Physics

    What is the gravitational field strength at a place 220km above Earth's surface, the altitude of many piloted space flights?

    asked by Bobbie on October 14, 2008
  59. College Physics II

    Consider a region in space where a uniform electric field E = 7450 N/C points in the negative x direction. What is the distance between the +13.1 V and the +14.1 V equipotentials?

    asked by VJC on September 15, 2010
  60. Math/Statistics

    A and B are events defined on a sample space, with the given probabilities. Find P(A and B). (Give your answer correct to two decimal places.) P(A | B) = 0.43 and P(B) = 0.75

    asked by Nora on May 30, 2013
  61. Marketing

    What is the impact of the competition in Internet space and how challenging it is and going to be for marketers to effectively compete for market share and customers?

    asked by Tammie on August 31, 2010
  62. calculus

    f(x)= x^3/x^2-16 defined on the interval [-19,16]. Enter points, such as inflection points in ascending order, i.e. smallest x values first. Enter intervals in ascending order also. What are F(x) TWO vertical asympototes? F(x)is concave up on the region

    asked by mkcolema on March 17, 2009
  63. Chemistry URGENT

    I have to match the items to the statements below, and I'm stuck! My answers are in parentheses, but I know that some of them are wrong. Please help if you know how...I would GREATLY appreciate it! A Dilute B Unsaturated C Saturated D Supersaturated 1.

    asked by Lindsay on April 25, 2007
  64. stats (please help)

    I need help determining what x and y is in this question. A psychologist has constructed a paper and pencil test purported to measure depression. To see how the test compares with the ratings of the expert, 12 emotionally disturbed individual are given the

    asked by Lou on April 2, 2009
  65. Chemistry

    A can of soda has the total volume of 350ml. This can is open and only contains atmospheric air, and is placed within a furnace 100 ° C. After the can achieve this reduced temperature at 25 ° C. With decreasing temperature, there is a reduction of the

    asked by Kelly on January 22, 2016
  66. chemestry

    draw the Lewis structure for the following compounds,and predict the molecular shapes. a) water,H2O b)Oxygen gas,O2 c)Ammonia, NH3 d)Ammonium ion,NH4

    asked by irfan on June 3, 2013
  67. Organic chemisty(Please check)

    When drawing a kekule structure for CH3CH2OH(alcohol) do I leave the OH at the end just like it is (OH) or would it be shown as O-H? I know that to start of it would be -C- with an H on the top and the bottom as well as the left side and then connected to

    asked by Hannah on September 12, 2012
  68. Science

    Which of the following is the minimum level of structure needed to preform the function of waste removal? A. Body System B. Tissue C. Cell D. Organ I chose A for my answer, is it correct? Thanks. :)

    asked by SandpitTurtle on January 23, 2014
  69. Chemistry

    Use principles of atomic structure to Explain why in aqueous solution, (a) potassium forms 1+ but not a 2+ ion (a) Ti3+ is colored but Sc3+ is not. (b) Ti2+ is a reducing agent but Ca2+ is not.

    asked by Lily on October 21, 2012
  70. science

    Help me please looked everywhere T- the skeletal system consists of 206 bones H- helps protects the body E- S-support K- E- L-ligaments E- T-tendons A- L- S-skeleton Y- S-shape and structure T- E-exercise M-

    asked by Anonymous on September 22, 2015
  71. organic chemistry

    Provide a structure for the following compound: C9H10O3; IR: 2400–3200, 1700, 1630 cm–1; 1H NMR: δ 1.53 (3H, t, J = 8 Hz); δ 4.32 (2H, q, J = 8 Hz); δ 7.08, δ 8.13 (4H, pair of leaning doublets, J = 10 Hz); δ 10 (1H, broad, disappears with D2O

    asked by Joseph on February 19, 2015
  72. ELA

    Which of the following pairs of poetry elements best help the reader to identify the poem's tone? 1. Rhyme and rhythm 2. Structure and theme 3. (Connotation and denotation) 4. Speaker and line length

    asked by Help I need somebody not just anybody on February 1, 2017
  73. chemisry

    A solid metal is described as having "AN ARRAY OF POSITIVE IONS IN A SEA OF ELECTRONS". Write down the electronic structure of a magnesium atom and use it to explain what this PHRASE means? can you please help me with this question thanks

    asked by abdul ali on August 20, 2012
  74. ELA

    Which of the following pairs of poetry elements best help the reader to identify the poem's tone? 1. Rhyme and rhythm 2. Structure and theme 3. (Connotation and denotation) 4. Speaker and line length

    asked by Help I need somebody not just anybody on February 1, 2017
  75. science

    Relate their structure of a neuron to the anatomy of the cerebral cortex and spinal cord. Be sure to discuss the locations of soma, axons, dendrites, and supportive cells in each area.

    asked by no need to worry on October 29, 2012
  76. organic chemistry

    Provide a structure for the following compound: C9H10O3; IR: 2400–3200, 1700, 1630 cm–1; 1H NMR: δ 1.53 (3H, t, J = 8 Hz); δ 4.32 (2H, q, J = 8 Hz); δ 7.08, δ 8.13 (4H, pair of leaning doublets, J = 10 Hz); δ 10 (1H, broad, disappears with D2O

    asked by Joseph on February 20, 2015
  77. AP Chem

    An aqueous solution contains 4.50 g of calcium chloride, CaCl2, per liter. What is the molarity of CaCl2? When calcium chloride dissolves in water, the calcium ions, Ca^+2, and chloride ions, Cl^-, in the crystal go into the solution. What is the molar

    asked by Anna on November 4, 2008
  78. Chemisdtry - Lewis Structures (check + help)

    Draw Lewis structures for each of the following ion: CO3 (2-) I tried this method below, i do not know where am i going wrong, please help me understand this concept for ions. Valence Electrons 4e- + 18e- = 22e- Noble gas Config 8e- + 24e- = 32e- Total

    asked by Farah on February 13, 2011
  79. 7th grade Science

    How does the internal structures of earth's density compare to the lithosphere's density? It is a lot greater, a little greater, a lot smaller or a little smaller?

    asked by Mary Grace on January 4, 2009
  80. Algebra

    A print shop makes bumper stickers for election campaigns. If x stickers are ordered (where x < 10,000), then the price per sticker is 0.28 − 0.000002x dollars, and the total cost of producing the order is 0.087x − 0.0000005x2 dollars. Use the fact

    asked by miriam on July 21, 2015
  81. 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.

    asked by bill on March 27, 2013
  82. Early Child Ed.

    Would you please check these questions and my answers? If they are wrong-- please let me know. 1. Early childhood professionals know that the beginning step in assisting non-mainstream children to develop literate style oral language is to: A) identify

    asked by Anonymous on November 9, 2007
  83. life science

    An organism's ability to maintain steady internal conditions despite changes in its external environment is called biogenesis homeostasis osmosis respiration In an organism, a virus enters, and reproduces within, a(n) host cell infection interferon

    asked by joe on May 12, 2010
  84. Calculus please help me

    f(x) = \frac{ x^3 }{ x^2 - 25 } defined on the interval [ -18, 18 ]. Enter points, such as inflection points in ascending order, i.e. smallest x values first. Enter intervals in ascending order also. The function f(x) has vertical asympototes at (? )and

    asked by Anonymous on November 4, 2014
  85. Calc

    For the function f(x) = 5x^6 + 6x^5 - 15x^4 a.) find where the function is increasing & decreasing b.) find where the graph if concave up & concave down c.) name all inflection points d.) find all relative extrema

    asked by Amy on February 7, 2011
  86. Math

    The length, l mm of an elastic string at time t seconds is given by l=t^3 / 3 - 4t +10 Find the instants (that is, the value of t ) when a) The length is increasing at a rate of 5 mm/Sec b) The length is decreasing at a rate of 4 mm/Sec

    asked by Aaqib zaman on January 28, 2015
  87. Differential Calculus

    The base of an isosceles triangle is 10 feet long and the base angles are decreasing at a rate of 2° per second. Find the rate of change of the area when the base angles are 45°.

    asked by Serena on May 11, 2016
  88. American Government, Lesson 1 Unit 3

    When the Framers created the legislative branch of government, why did they decide that this branch would have a bicameral structure?

    asked by Samantha on October 10, 2016
  89. English

    I have to do a plot outline, can someone tell me, "what the traditional pyramidal structure to map the important parts of the plot" is?

    asked by Michael on January 26, 2008
  90. science

    I am in seventh grade. I need to draw the structure of a lipid, protein, carbohydrate. Is there a simple way to draw these? Thank you.

    asked by rochelle on October 26, 2008
  91. chemistry

    convert the condensed formula to a complete and skeletal structure of the following formula (ch3)2chch2ch3

    asked by hensha on November 1, 2014
  92. organic chemistry

    Looking at a diagram of cortisone, where are all the stereocenters? I know there are 6 of them, I just don't know where they are in the structure. Sorry I can't provide a diagram, but I'm sure they can be found online.

    asked by Dre on February 8, 2011
  93. English

    The family structure is by far the greatest cause of people's social dysfunctioning. do you agree or not agree with this statement and why?

    asked by priya on November 12, 2008
  94. Chemistry

    What is the Lewis structure formula, electron pair geometry and the molecular geometry for SO4^2-

    asked by rose on August 7, 2013
  95. Engllish Grammar

    Help me to identify the sentence structure of this sentence. "Holmes is called in to help solve a mysterious problem"

    asked by Ram on March 23, 2011
  96. English

    1. She helped it happen for me to drive a car. 2. He let it happen to break the window. (What about these sentences? Can we use these structure?)

    asked by rfvv on November 4, 2016
  97. Chemistry

    What is the difference between an amino acid and a protein? How does this difference in structure affect biological function?

    asked by Laura on February 24, 2009
  98. science

    Suppose an ideal car jack has an input work 2750 J. It lifts a car 0.35 meters in 8 seconds. a. What is the output work of the jack? b. How much power is required to lift the car? c. What is the efficiency of the jack?

    asked by Anthony on March 14, 2017
  99. Physics

    A wind turbine has blades that sweep an area of 2000m2. It converts the power available in the wind to electrical power with an efficiency of 50%. What is the electrical power generated if the wind speed is 10ms–1? (The density of air is 1.3 kg m–3.)

    asked by Me on June 3, 2014
  100. Chemistry

    The order of the boiling points for the hydrogen halides, except for HF, is HI > HBr > HCl. The reason for this order can be attributed to a) the relative covalent bond strengths. b) differences in hydrogen bonding. c) differences in dipole-dipole

    asked by Ashley on February 1, 2012