
Popular questions and responses by 
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 
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 
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 
advanced functions
Prove that: 2sinxsiny = cos(xy)  cos(x+y)
asked on November 8, 2009 
math
The London Eye is a large ferris wheel. Each sealed and airconditioned 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 
CHEMvaporization
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 
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 
math
Solve 3sin2x  1 = 0 Interval: [0, 2 pi] Solve 6cos^2x + 5cosx  6 = 0
asked on November 15, 2009 
social justice
What is the fundamental difference between lifestyle branding and past forms of branding?
asked on October 1, 2013 
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) (td)) + 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 
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 
Chemistry
How do I find the empirical formula of FeSO4? Thanks!
asked on June 5, 2008 
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 
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 
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 
calculus
Deternime the instantaneous rate of change at x=2 for: y=x2x^3
asked on February 9, 2010 
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: M2M1 = log (b1 / b2) Here, M refers to a star's absolute magnitude, that
asked on November 30, 2009 
adv functions
Show that tanx= (sinx/ cosx) can be written as: tan(xy) = (tanx  tany) / (1+ tanxtany)
asked on November 7, 2009 
12th grade calculus
find points on the curve x^2+xy+y^2=7 (a) where the tangen is parallel to the xaxis and (b) wehre the tangent is parallel to athe yaxis. (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 
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 
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 
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 
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 
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 
MATHS
WHAT IS 32X14+_=689
asked on March 20, 2014 
social justice
what is the difference in older forms of corporate censorship and how it looks today?
asked on October 1, 2013 
social justice
how do you think globalization relates to the kind of large multinational corporations?
asked on October 1, 2013 
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 
math
four of every seven teenagers would prefer to watch a comedy when going to the movies
asked on August 20, 2012 
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 
math
Estimate the instantaneous rate of change for x=2 for y=x y=x^2 y=7
asked on February 9, 2010 
math
Estimate the instantaneous rate of change for x=2 for y=x y=x^2 y=7
asked on February 9, 2010 
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 
math please help
solve (sq.rt 2) (tanx)(cosx) = tanx
asked on January 26, 2010 
math
solve 2.84 = (1 + x ) ^ 12
asked on January 23, 2010 
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 
advanced functions
Solve 2tan^2x + 1 = 0 Interval : [0, 2 pi]
asked on November 15, 2009 
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 
advanced functions
Show that tanx = sinx / cosx can be written as tan(x+y) = (tanx + tany) / (1  tanxtany)
asked on November 8, 2009 
trigonometry
What is the exact value for sin5pi / 12 ?
asked on November 8, 2009 
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 
Biology
In a doublestranded fragment of DNA, which of the base pairs would you expect to be most stable
asked on October 12, 2009 
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 
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 
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 
CHEMISTRY!
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 
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 
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 
chemistry
what is the 'big idea of energy'???!
asked on September 26, 2008 
chemistry
how do i draw a particle model to describe the reaction between sulphur and iron in detail?
asked on September 26, 2008 
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 
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 
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

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 
8TH GRADE LANGUAGE ARTS. HELP PLEASE MS.SUE ASAP
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 
ELA
lolollolollollollollollollollollollolollolollollollollollollollollollolollolollollollollollollollollollolollolollollollollollollollollollolollolollollollollollollollollollolollolollollollollollollollollollolollolollollollollollollollollollolollolollollollo
posted on May 16, 2019 
Eng 1
What no answers?? Pathetic, why'd you even post here then?
posted on March 31, 2019 
mATH
@Fellow Cheater, no one says lolz anymore.
posted on March 19, 2019 
Math  Another question to check, sorry... =/
thank you for you answer kind sir
posted on March 13, 2019 
MATH PLEASE HELP!!!!!
12×3=36 36+12=48 48÷8=6 Answer:6
posted on January 17, 2018 
physics
Nono
posted on June 7, 2017 
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 
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 
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 
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 
Physics
9876
posted on August 31, 2016 
chemistry
4.76 atm
posted on April 6, 2016 
Art.
Lamp was correct, 5 is A.
posted on March 21, 2016 
physics 11
how did you fins 41.5??
posted on February 23, 2016 
Spanish
were they right?
posted on January 27, 2016 
language art
I think A. But I'm not sure
posted on December 9, 2015 
AP Physics
sorry 8.0*10^4 J of work
posted on November 11, 2015 
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 
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 
Math
^ that is actually wrong, because you are getting 4 marbles out of the bag...
posted on November 11, 2015 
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 
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 
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 
Grammar
some ideas for thought: 1.educationto get a better job and future 2.knowledgeopen 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 
math
1)11 and 4 (i can only think of this) 2)12 and 2
posted on September 10, 2014 
Grammar
is it an essay?
posted on September 10, 2014 
physics
Assumption: no air resistance. Since the downwards direction is stated as negative, acceleration due to gravity is 10m/s2. using a=(vu)/t, a being 10, u being initial velocity, v as velocity when hits the ground, t as time, u get t=(3.9v)/10. find
posted on September 10, 2014 
MATHS
multiply sign
posted on March 20, 2014 
chemistry
MOLES=MASS/MR
posted on March 20, 2014 
social justice
how though? i need help!
posted on October 1, 2013 
English
Submitted it and got it right, thank you ma'am. :)
posted on October 8, 2012 
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 
english 1
"To help prevent pollution, people could walk, ride bikes, and use public transportation."
posted on October 8, 2012 
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 
OPERATING SYSTEM
Patern: adcdetfa
posted on May 30, 2011 
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 
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 
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 
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 
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 
chem...help PLEASE!!!
can you explain that better? i'm confused.
posted on March 9, 2009 
CHEMISTRY!
I did it again this time I got 7774.51g which is much better. Thanks alot!
posted on January 27, 2009 
CHEMISTRY!
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 
12th grade calculus
thank alot
posted on October 19, 2008 
the big idea of energy
don' fikin ask me! got nooooooooo idea AT ALLLLLLLLLLLLLLLLLLLLLLLLLLLLLL!
posted on April 17, 2008