Popular questions and responses by -
  1. math

    A fireplace arch is to be constructed in form of a semiellipse. The opening is to have a height of 2 feet at the center and a width of 6 feet along the base. The contractor cuts a string of a certain length and nails each end of the string along the base

    asked on October 15, 2017
  2. Math

    The height, h, in metres, above the ground of a rider on a Ferris wheel can be modelled by the equation: h= 10 sin ((pi/15 t) - 7.5) + 12 where t is the time, in seconds. At t=0, the rider is at the lowest point. Determine the first two times that the

    asked on November 16, 2009
  3. physics

    the velocity of the water jet discharging from the orifice can be obtained from v = (2gh)^(1/2), where h = 2m is the depth of the orifice from the free water surface. determine the time for a particle of water leaving the orifice to reach point B and the

    asked on April 3, 2011
  4. advanced functions

    Prove that: 2sinxsiny = cos(x-y) - cos(x+y)

    asked on November 8, 2009
  5. math

    The London Eye is a large ferris wheel. Each sealed and air-conditioned passenger capsule holds about 25 passengers. The diameter of the wheel is 135 m, and the wheel takes about half an hour to complete one revolution. a) Determine the exact angle, in

    asked on November 6, 2009
  6. CHEM-vaporization

    A 50.0g piece of iron an 152°C is dropped into 20.0g H2O(l) at 89°C in an open, thermally insulated container. How much water would you expect to vaporize, assuming no water splashes out? The specific heats of iron and water are 0.45 and 4.21

    asked on February 6, 2009
  7. mathematics

    A group of twelve people are going to take a ride on a roller coaster at the same time in two different trains, one of which cannot fit more than 8 passengers, and the other cannot fit more than 7. In how many ways can the group take a ride?

    asked on May 6, 2016
  8. math

    Solve 3sin2x - 1 = 0 Interval: [0, 2 pi] Solve 6cos^2x + 5cosx - 6 = 0

    asked on November 15, 2009
  9. social justice

    What is the fundamental difference between lifestyle branding and past forms of branding?

    asked on October 1, 2013
  10. Advanced Functions

    The vertical position, h, in metres, of a gondola on a Ferris wheel is modelled using the function h = 10 sin ((pi/15) (t-d)) + 12 where t is the time, in seconds. The gondola must assume a vertical position of 7 m at t=0 s , and be on its way upward.

    asked on November 20, 2009
  11. advanced functions

    Determine approximate solutions for this equation in the interval x is all real numbers [0, 2pi), to the nearest hundredth of a radian: cosx + 0.75 = 0

    asked on November 13, 2009
  12. Chemistry

    How do I find the empirical formula of FeSO4? Thanks!

    asked on June 5, 2008
  13. AP Physics

    The Eiffel Tower is 300 m tall. When you are standing at a certain place in Paris, it subtends an angle of 7.0°. How far are you, then, from the Eiffel Tower?

    asked on December 3, 2015
  14. AP Physics

    A car does 8.0 ✕ 104 J of work in traveling 2.7 km at constant speed. What was the average retarding force (from all sources) acting on the car?

    asked on November 11, 2015
  15. English

    4. Read the following passage from “The People Could Fly”: The slaves labored in the fields from sunup to sundown. The owner of the slaves callin himself their Master. Say he was a hard lump of clay. A hard, glinty coal. A hard rock pile, wouldn’t be

    asked on October 8, 2012
  16. calculus

    Deternime the instantaneous rate of change at x=2 for: y=x-2x^3

    asked on February 9, 2010
  17. Advanced Functions

    How bright a star appears can depend on how much light the star actually emits and how far away it is. The stellar magnitude scale can be adjusted to account for distance as follows: M2-M1 = log (b1 / b2) Here, M refers to a star's absolute magnitude, that

    asked on November 30, 2009
  18. adv functions

    Show that tanx= (sinx/ cosx) can be written as: tan(x-y) = (tanx - tany) / (1+ tanxtany)

    asked on November 7, 2009
  19. 12th grade calculus

    find points on the curve x^2+xy+y^2=7 (a) where the tangen is parallel to the x-axis and (b) wehre the tangent is parallel to athe y-axis. (in this case, dy/dx is not defined, but dx/dy is. what value does dx/dy have at these point?)

    asked on October 19, 2008
  20. MATH

    Aiden uses 1/4 of the water in a bucket to water 1 plotted plant.How many plotted plants can Aiden water with 3 full buckets of water?

    asked on January 6, 2018
  21. chemistry

    In an experiment, 95.0 mL of 0.225 M silver nitrate was mixed rapidly with 47.5 mL of 0.225 M calcium chloride in a coffee cup calorimeter. If a reaction occurred, was it exothermic or endothermic? If the reaction started at 23.7 °C, what is the final

    asked on April 22, 2016
  22. AP Physics

    A centrifuge rotor rotating at 12000 rpm is shut off and is eventually brought to rest by a frictional torque of 1.50 m·N. If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, through how many revolutions

    asked on January 6, 2016
  23. AP Physics

    How fast (in rpm) must a centrifuge rotate if a particle 6.0 cm from the axis of rotation is to experience an acceleration of 130000 g's

    asked on December 4, 2015
  24. AP Physics

    What is the minimum work needed to push a 1025 kg car 290 m up a 17.5° incline with zero friction?

    asked on November 11, 2015
  25. MATHS

    WHAT IS 32X14+_=689

    asked on March 20, 2014
  26. social justice

    what is the difference in older forms of corporate censorship and how it looks today?

    asked on October 1, 2013
  27. social justice

    how do you think globalization relates to the kind of large multinational corporations?

    asked on October 1, 2013
  28. English

    1. Which sentence describes setting? As much as it saddened her, the first thing Nan had to do was leave her beloved family home. Marcy wanted to go to the dance, but Rob’s treatment of her that day gave her second thoughts. Steve was fairly short, with

    asked on October 8, 2012
  29. math

    four of every seven teenagers would prefer to watch a comedy when going to the movies

    asked on August 20, 2012
  30. Trigonometry

    Solve for x: 1. 2sin(2x)+cos(x)=0 2. cos(2x)=-2sin(x) 3. tan(x)=2sin(x)

    asked on April 21, 2010
  31. math

    Estimate the instantaneous rate of change for x=2 for y=x y=x^2 y=7

    asked on February 9, 2010
  32. math

    Estimate the instantaneous rate of change for x=2 for y=x y=x^2 y=7

    asked on February 9, 2010
  33. math pls

    Tidal forces are greatest when the Eaetg, the sun and the moon are in line. When this occurs at the Annapolis Tidal Generating Station, the waterhas a maximum depth of 9.6 m at 4:30 pm and a minimum depthof 0.4 m 6.2 hourslater. the equation is: y= 4.6cos

    asked on January 26, 2010
  34. math please help

    solve (sq.rt 2) (tanx)(cosx) = tanx

    asked on January 26, 2010
  35. math

    solve 2.84 = (1 + x ) ^ 12

    asked on January 23, 2010
  36. Hamlet

    Something is rotten in the state of Denmark. (I.iv.90) Using two different literary devices, prove or refute the quotation above.

    asked on November 30, 2009
  37. advanced functions

    Solve 2tan^2x + 1 = 0 Interval : [0, 2 pi]

    asked on November 15, 2009
  38. math

    A painted dot on the circumference of the wheel is 12cm from the centre of rotation of the wheel. How far does the dot travel in 5 sec., to one decimal place?

    asked on November 9, 2009
  39. advanced functions

    Show that tanx = sinx / cosx can be written as tan(x+y) = (tanx + tany) / (1 - tanxtany)

    asked on November 8, 2009
  40. trigonometry

    What is the exact value for sin5pi / 12 ?

    asked on November 8, 2009
  41. Spanish 3

    Would someone be willing to proofread my essay? It's supposed to be from the point of view of Pablo Picasso. Yo nací el 25 de octubre, 1881, en Malaga, Andalucia. Mi padre fue un pintor y un profesor de arte. Me enseñó los fundamentos de arte. Cuando

    asked on October 19, 2009
  42. Biology

    In a double-stranded fragment of DNA, which of the base pairs would you expect to be most stable

    asked on October 12, 2009
  43. advanced functions

    The manufacturer of a propeller for a small aircraft mandates a maximum operating angular velocity of 300 rad/s. Determine whether it is safe to install this propeller on an aircraft whose engine is expected to run at a maximum of 2800 rpm.

    asked on November 8, 2009
  44. Chem

    For the reaction I_2(s)+Cl_2(g) ==> 2ICl(g) ÄH= 36kJ, ÄS= 158.8J/K at 25° C. Calculate the temperature at which Keq is 4.0*10^3. ÄG= ÄH- TÄS = 36 - (298)(0.1588) = -11.32 ÄG= -RTlnK -11.32= -8.31Tln(4*10^3) -11.32= -6892.35 T T= .00164 correct

    asked on August 10, 2009
  45. chem- easy

    What is the total mass of a solution prepared by dissolving 4.00 of in 1.00 of water?

    asked on February 10, 2009

    what mass of ethylene glycol C2H6O2 the main component of anitfreeze, must be added to 10.0L water to produce a solution for use in a car's radiator that freezes at -23.3°C. Assume the density for water is exactly 1 g/m.L

    asked on January 27, 2009
  47. government

    Advocates of a parliamentary system argue that congress is inefficient, moves slowly, and develops policies laced with compromises. What evidence exists to support this negative evaluation?

    asked on October 19, 2008
  48. Chemistry

    assuiming that the calorimeter contains 5.00 * 10^2 g of water and the intial temperature is 30.0 degreddc, what will the final temperature be?

    asked on October 19, 2008
  49. chemistry

    what is the 'big idea of energy'???!

    asked on September 26, 2008
  50. chemistry

    how do i draw a particle model to describe the reaction between sulphur and iron in detail?

    asked on September 26, 2008
  51. French

    How do you say "we watched the sunset" in French? Is it "nous avons regardé le coucher du soleil?" Merci!

    asked on October 1, 2007
  52. French

    I need help with the adjective bien et bon. How do you know when to use what in a sentance. For Example: Would it be. Maire danse bonne. or Marie danse bien. How can I tell the difference. Bonne/bon is an adjective meaning "good." Bien is an adverb meaning

    asked on June 20, 2007
  53. French

    How do you say "if you want to read this..." in French? Would it be "Si vous voulez lire ceci...?" Thank you for using the Jiskha Homework Help Forum. Yes, that is one way. To be more polite, you might say "if you wish..." = Si vous voudriez.....

    asked on June 7, 2007
  1. Biochemistry

    A. Phe. Three of them are non polar. Phe is larger than others, introduce a greater sterical clash. B. Asp. Lys and Arg are positively charged. Asp is negatively charged. C. Glu. Gln and Asn are polar side chains. Glu is negatively charged. D. His. Pro and

    posted on November 24, 2019

    Hi I am going to go somewhere else to get my car back from work and then I’ll be back

    posted on November 20, 2019
  3. ELA


    posted on May 16, 2019
  4. Eng 1

    What no answers?? Pathetic, why'd you even post here then?

    posted on March 31, 2019
  5. mATH

    @Fellow Cheater, no one says lolz anymore.

    posted on March 19, 2019
  6. Math - Another question to check, sorry... =/

    thank you for you answer kind sir

    posted on March 13, 2019

    12×3=36 36+12=48 48÷8=6 Answer:6

    posted on January 17, 2018
  8. physics


    posted on June 7, 2017
  9. Language Arts

    1D 2D 3C 4B 5B 6C 7 - do it yourself 8A 9C 10B 11B 12B 13B 14D 15C 16D 17B 18D good luck!!!

    posted on May 19, 2017
  10. LA - 1 question

    1D 2D 3C 4B 5B 6C 7 - do it yourself 8A 9C 10B 11B 12B 13B 14D 15C 16D 17B 18D good luck!!!

    posted on May 19, 2017
  11. English

    1D 2D 3C 4B 5B 6C 7 - do it yourself 8A 9C 10B 11B 12B 13B 14D 15C 16D 17B 18D good luck!!!

    posted on May 19, 2017
  12. English

    1D 2D 3C 4B 5B 6C 7 - do it yourself 8A 9C 10B 11B 12B 13B 14D 15C 16D 17B 18D good luck!!!

    posted on May 19, 2017
  13. Physics


    posted on August 31, 2016
  14. chemistry

    4.76 atm

    posted on April 6, 2016
  15. Art.

    Lamp was correct, 5 is A.

    posted on March 21, 2016
  16. physics 11

    how did you fins 41.5??

    posted on February 23, 2016
  17. Spanish

    were they right?

    posted on January 27, 2016
  18. language art

    I think A. But I'm not sure

    posted on December 9, 2015
  19. AP Physics

    sorry 8.0*10^4 J of work

    posted on November 11, 2015
  20. math

    now all you have to do is find the number from the steps above that has the tens digit as twice the ones digit

    posted on November 11, 2015
  21. math

    if the sum of the numbers is 9, then it must be a multiple of 9 now what are all the 2 digit multiples of 9?

    posted on November 11, 2015
  22. Math

    ^ that is actually wrong, because you are getting 4 marbles out of the bag...

    posted on November 11, 2015
  23. algebra

    well I always start by drawing a small diagram just to help you visualize. you can see that you need to set a proportion of Rogers height Poles height _____________ = ______________ Rogers shadow Poles shadow 5 P _ = __ 3.5 15 now you can cross multiply

    posted on November 1, 2015
  24. Physics

    To answer this question you must first solve: Acceleration=(gravity)(coefficient of friction) which equals 3.724 you than plug acceleration into the equation (velocity final)^2=(velocity initial)^2+2(acceleration)(distance) and you solve for velocity

    posted on November 1, 2015
  25. math

    let the width of the rectangle be k. so the length of rectangle is (3/2)k. Perimeter of the rectangle=(3/2)k+(3/2)k+k+k =5k =180m so, 5k=180 k=36. thus, the width of the rectangle is 36m. For the length, Length=(3/2)(36) =54m

    posted on September 10, 2014
  26. Grammar

    some ideas for thought: 1.education-to get a better job and future 2.knowledge-open our eyes to see the world in another light and gain insights of how things work. 3.Appreciation of knowledge 4.Make new friends 5.An alternative of home

    posted on September 10, 2014
  27. math

    1)1-1 and 4 (i can only think of this) 2)1-2 and 2

    posted on September 10, 2014
  28. Grammar

    is it an essay?

    posted on September 10, 2014
  29. physics

    Assumption: no air resistance. Since the downwards direction is stated as negative, acceleration due to gravity is -10m/s2. using a=(v-u)/t, a being -10, u being initial velocity, v as velocity when hits the ground, t as time, u get t=(3.9-v)/10. find

    posted on September 10, 2014
  30. MATHS

    multiply sign

    posted on March 20, 2014
  31. chemistry


    posted on March 20, 2014
  32. social justice

    how though? i need help!

    posted on October 1, 2013
  33. English

    Submitted it and got it right, thank you ma'am. :)

    posted on October 8, 2012
  34. English

    I'll take each answer and show you why I think it is right, or why I think it is wrong. "He has skin that is rough and burned by the sun." This answer is completely irrelevant and is trying to throw me off course. "He is cruel and feels no compassion for

    posted on October 8, 2012
  35. english 1

    "To help prevent pollution, people could walk, ride bikes, and use public transportation."

    posted on October 8, 2012
  36. lang arts

    The correct answers are: 1. D 2. A 3. B 4. B The kid above was wrong with number 1.

    posted on October 8, 2012

    Patern: adcdetfa

    posted on May 30, 2011
  38. MATH!

    You would multiply the top one by -4 and the bottom one by +3, if you want to keep y positive.

    posted on October 19, 2009
  39. biology please help!

    Nucleus, Cell membrane/wall or cytoskeleton (depends on what you learned in class, or your text book). I'm not sure of the last one.

    posted on October 19, 2009
  40. Spanish 3

    Continued Tenía una pequeña carrera de la película. Estaba en películas múltiples, pero me jugué siempre. Mori en el 8 de abril, 1873 cuando yo y la segunda esposa, Jacqueline, recibían un partido de cena. mis palabras pasadas eran, “Beba a mí,

    posted on October 19, 2009
  41. Spanish 3

    En el próximo ano, mi amigo Soler y yo publicamos una revista se llama “Arte Joven” que se ilustré. En este tiempo tenía muchas novias, junto con una esposa o dos. También en este tiempo, mis pintores grises y azules. Se llamó me “Periodo

    posted on October 19, 2009
  42. Spanish 3

    Continued : En el año 1900, viajé a París y me encantó! Viví con mi amigo Max. Max durmió en la noche y trabajó en el día y yo dormí en el día y trabajé en la noche. Era como la vida solamente. Éramos pobres y tuvimos que quemar algo de mi arte

    posted on October 19, 2009
  43. chem...help PLEASE!!!

    can you explain that better? i'm confused.

    posted on March 9, 2009

    I did it again this time I got 7774.51g which is much better. Thanks alot!

    posted on January 27, 2009

    I feel like I have made a mistake because the mass seems too small. I don't know where I went wrong :S Molality = ÄTf / (Kf * i) = 23.3°C / (1.86°C/m * 3) = 4.18m (mol C2H6O2 / kg water) The amount to dissolve is: n_C2H6O2 = molality * m_water = 4.18

    posted on January 27, 2009
  46. 12th grade calculus

    thank alot

    posted on October 19, 2008
  47. the big idea of energy

    don' fikin ask me! got nooooooooo idea AT ALLLLLLLLLLLLLLLLLLLLLLLLLLLLLL!

    posted on April 17, 2008