# Posts by -

Total # Posts: 86

**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?

*May 6, 2016*

**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 temperature of the ...

*April 22, 2016*

**Spanish**

were they right?

*January 14, 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 will the rotor ...

*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

*December 4, 2015*

**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?

*December 3, 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?

*November 11, 2015*

**AP Physics**

sorry 8.0*10^4 J of work

*November 11, 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?

*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

*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?

*November 11, 2015*

**Math**

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

*November 10, 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 initial: (0)^2=(VI)^2+2(-3...

*November 1, 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 5(15)=3.5(P) 75=3.5P P...

*November 1, 2015*

**physics 11**

how did you fins 41.5??

*October 20, 2015*

**Art.**

Lamp was correct, 5 is A.

*March 10, 2015*

**language art**

I think A. But I'm not sure

*January 9, 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

*September 10, 2014*

**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

*September 10, 2014*

**Grammar**

is it an essay?

*September 10, 2014*

**math**

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

*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=(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 another value of such ...

*September 9, 2014*

**MATHS**

multiply sign

*March 20, 2014*

**MATHS**

WHAT IS 32X14+_=689

*March 20, 2014*

**CHEMistry**

MOLES=MASS/MR

*March 20, 2014*

**social justice**

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

*October 1, 2013*

**social justice**

how though? i need help!

*October 1, 2013*

**social justice**

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

*October 1, 2013*

**social justice**

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

*October 1, 2013*

**Physics**

9876

*September 9, 2013*

**English**

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

*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 the...

*October 8, 2012*

**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 moved. What...

*October 8, 2012*

**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 glasses and dark ...

*October 8, 2012*

**english 1**

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

*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.

*August 31, 2012*

**math**

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

*August 20, 2012*

**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 horizontal distance x ...

*April 3, 2011*

**chemistry**

4.76 atm

*January 31, 2011*

**Trigonometry**

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

*April 21, 2010*

**OPERATING SYSTEM**

Patern: adcdetfa

*February 10, 2010*

**calculus**

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

*February 9, 2010*

**math**

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

*February 9, 2010*

**math**

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

*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 (2pi/12.4) (t-4.5) + ...

*January 26, 2010*

**math please help**

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

*January 26, 2010*

**math**

solve 2.84 = (1 + x ) ^ 12

*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.

*November 30, 2009*

**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 is, how brightly...

*November 30, 2009*

**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. Determine the phase shift...

*November 20, 2009*

**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 rider is 20 m above the ...

*November 16, 2009*

**math**

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

*November 15, 2009*

**advanced functions**

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

*November 15, 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

*November 13, 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?

*November 9, 2009*

**advanced functions**

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

*November 8, 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.

*November 8, 2009*

**trigonometry**

What is the exact value for sin5pi / 12 ?

*November 8, 2009*

**advanced functions**

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

*November 8, 2009*

**adv functions**

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

*November 7, 2009*

**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 radians, that a ...

*November 6, 2009*

**MATH!**

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

*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.

*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 ...

*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...

*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. &...

*October 19, 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 ...

*October 19, 2009*

**Biology**

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

*October 12, 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 ...

*August 10, 2009*

**chem...help PLEASE!!!**

can you explain that better? i'm confused.

*March 9, 2009*

**chem- easy**

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

*February 10, 2009*

**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 respectively, and Ä...

*February 6, 2009*

**CHEMISTRY!**

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

*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 mol/kg * ...

*January 27, 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

*January 27, 2009*

**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?)

*October 19, 2008*

**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?

*October 19, 2008*

**12th grade calculus**

thank alot

*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?

*October 19, 2008*

**chemistry**

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

*September 26, 2008*

**chemistry**

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

*September 26, 2008*

**Chemistry**

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

*June 5, 2008*

**French**

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

*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 "well...

*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.....

*June 7, 2007*

**the big idea of energy**

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

*December 5, 2006*

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