Sunday

February 7, 2016
Total # Posts: 3,259

**physics**

A jetliner is traveling east from Seattle to Chicago, a distance of 1,750 miles. The jetliner travels at an average air speed of 620 mph relative to the air. At the jetliner's altitude, the wind is blowing 46 mph to the east. How long does the journey take?
*June 15, 2015*

**physics**

An astronaut in a spacecraft looks out her window and observes a comet travel in the opposite direction at a relative speed of 237 m/s. The velocity of the spacecraft is 114 m/s directly away from the sun. What is the comet's velocity relative to the sun? Assume that ...
*June 15, 2015*

**physics**

A stone is thrown vertically upwards, reaches a highest point, and returns to the ground. When the stone is at the top of its path, its acceleration
*June 15, 2015*

**physics**

Hot air balloon A is rising upward a rate of 5.0 m/s. A passenger aboard balloon A observes balloon B rising upward at a relative rate of 7.5 m/s. What is the velocity of balloon B relative to the ground? Assume that up is positive.
*June 15, 2015*

**physics**

A test rocket is fired straight up from rest. The net acceleration is 20 m/s2 upward and continues for 4.0 seconds, at which time the rocket engines cease firing. What maximum elevation does the rocket reach?
*June 15, 2015*

**Calculus**

So don't write cos x = 0 and sin x = 0 ?
*June 15, 2015*

**Calculus**

Okay
*June 15, 2015*

**Calculus**

Yes, so what work do I need to show how I got a Absolute Maximum at pi/2 and 3pi/2
*June 15, 2015*

**Calculus**

To show how I got the answer, is the work sufficient? f(x)= sin^2(x) f'(x)=2sinx(cosx) = cosx(2sinx) cosx=0 sinx=0 f(0)=0 f(pi)=0 f(pi/2)=1 f(3pi/2)=1 Absolute Maximum is at pi/2 and 3pi/2
*June 15, 2015*

**Calculus**

On the closed interval, [0, 2*pi], find the absolute maximum of the function f(x)= sin^2(x)
*June 15, 2015*

**Calculus**

-3/2 feet per minute I meant
*June 15, 2015*

**Calculus**

Is this right? 1.5 ft = dr/dt 2x dx/dt + 2y dy/dt = 0 2(18)(2) + 2(24)= 0 72 + 48 dy/dt = 0 48 dy/dt = -72 dy/dt = -72/48 = -3/4 feet per minute
*June 15, 2015*

**Calculus**

36 dx/dt + 48 dy/dt = 0 48 dy/dt = -36 dx/dt dy/dt = -.75 or -3/4
*June 15, 2015*

**Calculus**

So what's next to find the rate at which the ladder is moving toward the building when it is 18 ft from the wall?
*June 15, 2015*

**Calculus**

A ladder 30 ft. long is leaning up against a building. If the top of the ladder is being pulled up the wall of the building at a rate of 1.5 feet per minute, find the rate at which the base of the ladder is moving toward the building when it is 18 feet from the wall.
*June 15, 2015*

**French, foreign languages**

Hi the following sentences are basically unscrambling them in the first place and then putting the sentence in order. If when looking through my unscrambled sentences and you see something wrong with the grammar or something of that nature that does not make the sentence ...
*June 14, 2015*

**French, foreign languages**

Hi, This are my answers using verbs from a list provided in the assignment in the future. If something within the sentences or if I have used a verb wrong please let me know and if possible tell me a correction I can make to make it more understandable or more grammatically ...
*June 14, 2015*

**French, foreign languages**

I need help understanding the present subjunctive in French and also the usage of Il faut in said sentence
*June 14, 2015*

**Math**

Byron’s house has a roof with dimensions shown. (Roof: 1m Height, 7m Hypotenuses, 12m length) He knows that the average rainfall in his suburb is 30cm per year. Byron would like to install a cylindrical rainwater tank to hold the water that runs off the roof. The tank is ...
*June 14, 2015*

**French, foreign languages**

I need help completing an assignment that includes completing sentences from a reading. T The questions have my answers within them to complete the sentence. Once you have read the the questions with my answers within the questions and you see something wrong with my answers ...
*June 13, 2015*

**MWS**

:)
*June 13, 2015*

**MWS**

well then that can be the answer thxs
*June 13, 2015*

**MWS**

First i thought it was new companies and now i have second thought i think it is now trade organizations what do you think
*June 13, 2015*

**MWS**

In recent times, Latin American countries have tried to improve their economies by forming these. Need help
*June 13, 2015*

**French, foreign languages**

Hi, Can you please check my sentences to see if I have the used verbs that are in the conditional correctly and also if they do not make sense tell me what I did wrong and if possible tell me what corrections I should make. Here are my sentences and the questions: Dans un ...
*June 13, 2015*

**French, foreign languages**

Hi, I desperately need help with double object pronouns in French. Here are questions that I am working on and I can't make heads nor tails of them: L'agence de voyages a envoyé les billets d'avion à mes parents. Mes parents ont acheté de ...
*June 13, 2015*

**French, foreign languages**

What verbs are in the conditional in French as I need it for an assignment that I am working on: 1.Dans un monde idéal, il n'y... 2. Vous n'avez pas d'argent? À votre place (In your place), je/j'... 3.On n'a pas cours lundi. On... 4.Dans un ...
*June 13, 2015*

**MWS**

well then thanks for the help i think i got it from here
*June 12, 2015*

**MWS**

because there were more job opportunities
*June 12, 2015*

**MWS**

Why has the sunbelt experienced growing populations over the past decades?
*June 12, 2015*

**French, foreign languages**

Here is what I think number 2 is : Mes parents achete les leur a mi soeur et a moi. For number 3 I have: Nous avons demande les leur visas aux différents consulats.
*June 12, 2015*

**French, foreign languages**

Hi, I desperately need help with double object pronouns in French. Here are questions that I am working on and I can't make heads nor tails of them: L'agence de voyages a envoyé les billets d'avion à mes parents. Mes parents ont acheté de ...
*June 12, 2015*

**science**

) If an ocean is opening at a rate of 5 cm/year and it has been doing so at the same rate for 10 million years, approximately how wide is that ocean?
*June 12, 2015*

**Math**

Cheers Steve.
*June 10, 2015*

**Math**

If f and g are functions defined for all real numbers, and f is an odd function, then f ∘ g is also an odd function. Justify. I wrote false cause for example if f = x^3(odd) and g=x^2(even) the fog is even.
*June 10, 2015*

**Physics**

A race car travels on a flat circular track at the maximum possible speed without slipping. If the radius of the track is 39m and the coefficient of friction is 0.73, how long (seconds) does it take the race car to complete 5 laps?
*June 9, 2015*

**math**

balance on an initial investment of $1,500 over 25 years at 5% APR. After 10 years about how much interest has the investment earned
*June 6, 2015*

**6th Grade World History Help Please!**

the answer is B
*June 5, 2015*

**Calculus**

Describe the solid whose volume is represented by the following definite integrals. The integral of 2pi(x-1)e^x from 2 to 7.
*June 5, 2015*

**Social Studies**

opps wrong disscution
*June 4, 2015*

**Social Studies**

ok ok ok ok i did read
*June 4, 2015*

**language arts**

not going to help anymore bad at helping people at least i tried
*June 4, 2015*

**language arts**

iris is my sister
*June 4, 2015*

**language arts**

now i am getting really confused
*June 4, 2015*

**language arts**

no this is alex
*June 4, 2015*

**language arts**

i agree it is awesome but the ending i was just made
*June 4, 2015*

**language arts**

opps wrong name
*June 4, 2015*

**language arts**

do you still want to learn more about it
*June 4, 2015*

**language arts**

never mind i still have the book
*June 4, 2015*

**language arts**

i consider it as horrible ending becasue there is no series and i do not have the book anymore although i wish i did
*June 4, 2015*

**language arts**

well in the book it says that well i think it had said that it is inportant so he does run away but with the younger brother then at the end it has a horrible endng
*June 4, 2015*

**Social Studies**

United States that American settlers were destined
*June 4, 2015*

**French, foreign languages**

Salut, I am taking French 20 through ALDC via VHLCentral and I am having trouble with 5 questions of Lesson 2B-Enregistrez. I have the answer for question 1. But for the other 5 I do not have a clue can someone please help me with this? If someone has done this course in the ...
*June 3, 2015*

**Math: 5th Grade**

A florist had an equal number of red and yellow tulips. She sold 624 red tulips. Then she had 4 times as many yellow tulips as red tulips. How many tulips did she start with? You must use a bar model to solve this problem.
*June 1, 2015*

**Math**

prove: sec^2(x)=1+tan^2(x)
*June 1, 2015*

**Math**

'Write as a piecewise defined function.'
*June 1, 2015*

**Math**

Can someone please help me with piecewise functions. I know what they are but when it gets to advanced i have ttrouble. s(x)= /x-2/ + /x-3/ + /x+1/ (/ / = 'modulus') Write as a piecewise defined function. Have no idea tbh. Thanks
*June 1, 2015*

**art**

setting up a photograph to control the lighting, the subjects position, and the angle of the photograph is an example of which artistic technique A.) improvisation B.) staging C.) photo editing d.) cropping
*May 29, 2015*

**Physics**

On a flat golf course, a golf ball lies 12m from the base of a lamp post. A golfer hits the ball with a club, giving the golf ball an initial velocity of 18 m/s. At 2.9 seconds, after being hit, the golf ball strikes the top of the lamp post. How high (m) is the lamp post?
*May 26, 2015*

**chemistry**

how many grams of solid magnesium nitrate should be added to 5.0 grams of solid sodium nitrate in a 500 mL volumetric flask in order to produce an aqueous 0.25M solution of NO3- ions (once the flask is filled to the 500mL volume line)? No idea where to start for this question.
*May 25, 2015*

**Foreign language, French**

I also need help understanding what the speaker for Lesson 4A Decrivez is saying because she kind of mumbles and I can't catch it. If someone is currently doing the course ( the course is French 2) that will be ideal but any and all help I will find acceptable. Thanks (Merci)
*May 25, 2015*

**Foreign language, French**

I need help with speaking portion of the VHL Central Lesson 2B Enregitrez as I can't really hear the speaker quite properly. If someone is currently doing the course ( the course is French 2) that will be ideal but any and all help I will find acceptable. Thanks (Merci)
*May 25, 2015*

**Math**

It did help but not sure if they are two different experiments cause your are comparing the effectiveness of each weed killer. Also not really sure on how to draw the flow chart for the design.
*May 23, 2015*

**Math**

And what if i'm having problems cause i did not attend class for these? Anyways From what i can figure out: a) The explanatory variables would be the actual weed killers (A and B) and the different type of weeds themselves... so two explanatory variables ?.. weird? ...
*May 23, 2015*

**Statistics**

So can you confirm if this is good enough? (4marks) Sample size is a very important factor in terms of the test of significance. Increasing the sample size increases the power of a significance test. Here the 'power' of a significance test measures its ability to ...
*May 23, 2015*

**Statistics**

The interpretation of a test of significance can depend on the sample size and the practical context of the test. Write a short explanation of how sample size can affect the decision about statistical significance and whether or not the result is of any practical significance.
*May 23, 2015*

**Physics**

An object is placed 20.0 cm to the left of a convex lens with a focal length of +8.0 cm. Where is the image of the object? A)28 cm to the right of the lens B)13 cm to the left of the lens C)13 cm to the right of the lens
*May 21, 2015*

**help**

The sum of two numbers is 20. One number is 3 times the other. Find the numbers.
*May 20, 2015*

**math**

The Bishop's Peak 4-H club is having its annual fundraising dinner. Adults pay $35 apiece and children pay $20 apiece. If the number of adult tickets sold is twice the number of children's tickets sold, and the total income for the dinner is $1,890, how many of each ...
*May 20, 2015*

**math**

2 N 11D ?
*May 20, 2015*

**math**

Diane has $1.20 in dimes and nickels. She has a total of 13 coins. How many of each kind does she have?
*May 20, 2015*

**mathematicalmodel**

This is very true, I haven't got the answer, but the exam finishes today. I am not interested in using it to pass, but I would like to see the working (if possible, when the exam is finished!)
*May 19, 2015*

**mathematicalmodel**

I can not figure this out! has anyone got it?
*May 19, 2015*

**physics**

Work=change in potential energy therefore W=mgh = 75kg*9.8m/s^2*1.75m = 1286.25 J
*May 19, 2015*

**Calculus**

The following definite integral gives the area of the region between the graph of the function f(x) = Icosx - x^2I (I=modulus), the x-asis, and the lines x=-2 and x=2. the integral of mod cosx - x^2 from -2 to 2. Describe a different region whose area is given by this integral...
*May 19, 2015*

**Calculas**

and this got me to Galagan's answer of 4*pi... but still not sure so don't take my answer for it Galagan.
*May 19, 2015*

**Calculas**

hhmmmm... i used the equation v=integral of pi*y^2 from a to b.
*May 19, 2015*

**Math**

Simplify -5x-5y+3+x+2y-3.
*May 14, 2015*

**Computer science**

Write the pseudocode for a method that receives as input the cost of a meal, and then adds a 9% tax rate, and then outputs a 15% tip on top of the price+tax
*May 13, 2015*

**Science **

When a water wave with a positive amplitude of one meter meets another water wave with a negative amplitude of one meter, what will be the result? Explain.
*May 11, 2015*

**Science**

What is the formula for the frequency of visible light? Using this formula, explain what will happen to the frequency when yellow light (580 nanometers) is slowed down slightly when it passes through a crystal.
*May 11, 2015*

**Chemistry**

A voltaic cell consists of an Mn/Mn2+ half-cell and a Pb/Pb2+ half-cell. Calculate [Pb2+] when [Mn2+] is 2.1 M and Ecell = 0.13 V.
*May 4, 2015*

**history**

What geographical advantage does the Italian landscape have over the Greek landscape?
*April 29, 2015*

**history**

How long did the Byzantine Empire last?
*April 29, 2015*

**science**

How much heat is added to 10 g of water when you start from room temperature and heat it to its boiling point?
*April 27, 2015*

**Social Studies Please Help!!!**

That makes a lot more sense....
*April 27, 2015*

**Social Studies Please Help!!!**

My reasoning behind changing my name was to see if alphabetic order mattered, but it doesn't..... just wanted to let you know....(=
*April 27, 2015*

**Social Studies Please Help!!!**

(=
*April 27, 2015*

**Social Studies Please Help!!!**

1) Which of the following most directly made possible the Age of Exploration? A) hydropower B) caravel C) aqueduct D) wind turbine 2) Which region of Western Europe experiences an arctic climate. A) the Iberian Peninsula B) Italy and Greece C) the British Isles D) Northern ...
*April 27, 2015*

**Chemistry **

One mole of N2 and 3 moles of H2 are placed in a flask at 375 degree celsius.? Calculate the total pressure of the system at equilibrium if the mole fraction of NH3 is found to be 0.21. The Kp for the reaction is 4.21 x 10 raise to -4
*April 22, 2015*

**Science**

The effect _______ explains how fast air moves across a surface, the ____ pressure that presses on that surface. In contrast, the more ____ that air moves, the more of _____ there will be. I'm sorry that it might not make sense, I translated it from French. I tried using ...
*April 21, 2015*

**Math**

Hi again. Just realised that i got B wrong. So it means i need that too. Just to clarify (b) Show that if x and y are related by the equation √x + √y = 1 then dy _____ dx= -√(y/x) _ _ I got -√y/-√x.
*April 21, 2015*

**Math**

In this problem we consider drawing some straight lines which form a nice pattern. Consider joining the point (0.1,0) to the point (0,0.9) by a line segment; then joining (0.2,0) to (0,0.8) by a line segment; and so on. In general, consider joining the points (a,0) and (0,b) ...
*April 21, 2015*

**history**

Gaul is the Roman term for what modern country?
*April 20, 2015*

**Math**

7. You are having a discussion about sequences with your classmate. She insists that the sequence 2, 3, 5, 8, 12 must be either arithmetic or geometric. Is she correct or incorrect? Explain.
*April 17, 2015*

**AP Chemistry**

The thing is I tried the negative p delta v on my UT homework, and it didn't accept so I thought maybe moles had something to do with it. Unless I was doing the equation wrong.
*April 16, 2015*

**AP Chemistry**

How much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.1 liters against a constant external pressure of 0.0100 atm? Answer in units of J. I get w=-p(deltaV) but what about moles?
*April 16, 2015*

**6th grade math**

Chris has made the following grades on five math test. 90,74,86,75,94 What score must Chris earn on the next math test to have a test average of exactly 85?
*April 14, 2015*

**6th grade math**

While battling a forest fire , Samuel was only able to get three hours of sleep during the first day. What was the percent of the day was Sam awake F. 87.5% G. 37.5% H. 90% J. 10%
*April 14, 2015*

**5th grade math**

As of july 2004, the population Was 293,027,571 if more than half of these peaple live within 80 kilometers of an ocean,about how many peaple live within that distance show your work
*April 13, 2015*