Saturday
December 10, 2016

Posts by alex

Total # Posts: 3,592

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

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
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

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

life orientation
Alien & Sedition Acts.
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

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

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

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

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

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

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

Algebra 1
My answer is 27 sqrt 15y^2
April 13, 2015

Physics
A spring of length 10.0 cm and spring constant 160 kN/m is compressed to a length of 4.00 cm. If, when released, it pushes a block of mass 100 kg, a) what is the speed of the block after it slides up a 15.0 cm hill? b) What is its speed after it falls into a 10.0 cm dip?
April 9, 2015

ttu
The triprotic acid H3A has ionization constants of Ka1 = 2.5× 10–4, Ka2 = 3.4× 10–8, and Ka3 = 5.4× 10–13. Calculate the following values for a 0.0760 M solution of NaH2A
April 9, 2015

chemistry
how many electrons can n=4 l=1 have?
April 8, 2015

Spanish
in that case if you are referring to a specific cafeteria like the school's cafeteria it would be "la comida de la cafeteria no es saludable" if not then "la comida de cafeteria no es saludable"
April 7, 2015

Spanish
Are you going to write it with in a sentence or by itself?
April 7, 2015

ela help me on this please damon,reed,writeacher
"inappropriate" lol'd
April 1, 2015

Trigonometry
Solve each equation, giving a general formula for all of the solutions: a. 2sin^2(x)-5 sin(x)-3=0 b. (cos(x)-((sqrt2)/2))(sec(x)-1)=0
March 28, 2015

Trigonometry
Solve each equation for theta, giving a general formula for all of the solutions: a. tan(theta)=-1 b. sin(theta/2)=1/2
March 28, 2015

English
i don't know
March 25, 2015

English
During our summer vacations, we would always go out to our cabin by Butterfly Creek. The trips were always fun and relaxing. We would take hikes, photograph the wildlife, and swim in the river. Wildflowers in high meadows. Butterflies hovering. I still remember the smell of ...
March 25, 2015

science
based on the masses of CaCl2 and Na3PO4 you determined from the periodic table, what mass combining ratio would you predict?
March 22, 2015

Chemistry
If there are 57.6 mL of water that change from 19.4 degrees Celsius to 34.7 degrees Celsius, calculate the number of joules of energy transferred in the form of heat. Round to the nearest whole number. The specific heat capacity of water is 4.18 J/g*C and density of water is 1...
March 22, 2015

Economics
1. What determines the size of the key-money payments that landlords demand (and tenants offer) for the right to rent a controlled apartment? 2. Who, other than the owners of rental units, loses as a result of rent controls? Who gains from rent controls? What effect would the ...
March 20, 2015

Stereo Inc. sells a stereo system for \$500 down and monthly payments of \$60 for the next 4 years. If the interest rate is 1.75% per month, find: a) The cost of the stereo. b) The total amount of interest paid.
March 18, 2015

French, foreign language
Read each definition and write the appropriate word or expression in the space provided. 1. C'est un plat typiquement français. On les prépare avec du beurre et de l'ail. Ce sont un escargot . (incorrect) 4.On les utilise pour faire des omelettes. Ce sont...
March 18, 2015

French, foreign language
Hi, I need help with answering some questions for French Here's my work on them tell me what you came up with for each question that is incorrect: 1.C'est un plat typiquement français. On les prépare avec du beurre et de l'ail. Ce sont un escargot (...
March 17, 2015

calculus
1.) Find the derivative of ((x + 3)/e^x) ^ (Log e X) 2.) T/F (log e X)' = (log e |x|)' 3.) T/F (Log e 7x)' = (log e x)' 4.) Find the derivative of e^(log e 7x)
March 15, 2015

algebra
March 13, 2015

The coordinates of two vertices of triangle DEF are D(-5,5) and E(9,8). Determine two possible coordinates for for F that would make DEF a right triangle ? ans: slope DE = 8-5 / 9 - (-3) = 3/12 I don't know this part :how to Determine two possible coordinates for for F ...
March 12, 2015

Physics
A pilot wants to fly directly north to an airport 500 km away. His speed relative to the air is 100 km/h. Howevere there is a 40 km/h cross wind blowing from west to east. At what angle relative to the south north direction should he fly to arrive at the distant airport? How ...
March 11, 2015

Art
thank you pancake you are the best
March 10, 2015

Foreign Language, French
Can you please proofread my answers to the questions assigned by my teacher and correct me where needed? 1. découvrir / vieille / qu'est-ce qu' / dans / ils / valise / la Qu'-est-ce qu' ils veieille ont découvert la valise? 2. cette / nous / ...
March 10, 2015

Math
(1*5)+(5*5)+(25*5)=155 1st group: Chair calls 5 2nd group: 5 calls 5 each=25 3rd group: 25 call 5 each=125 Members called= 155. It is easier if you draw and name each member.
March 6, 2015

science
Part I: Units of Measurement for Gas Laws For the following questions, use the following answer choices to indicate what each unit of measurement is used to measure (pressure, volume, or temperature). 1. atm 2. kPa 3. L 4. oC 5. torr 6. K 7. mL 8. cubic centimeters (cm3) ...
March 2, 2015

chemistry
everything
March 2, 2015

chemistry
Find the molar masses of the following compounds: 1. LiI 2. PbCO4 3. Mg(OH)2 4. (NH4)3PO4 Find the percent composition (percent by mass) of the given element in the following compounds: 1. Fluorine in AgF 2. Hydrogen in glucose (C6H12O6) 3. Oxygen in Fe2(SO4)3 PART II: ...
March 2, 2015

Chemistry Help
Thank you so much DrBob222. Now I understand.
February 27, 2015

Chemistry Help
February 27, 2015

Chemistry Help
The theoretical yield of Cl2 that could be prepared by mixing 15.0 g of manganese dioxide (MnO2) with 30.0 g of HCl is 12.2 g. The limiting reagent was MnO2. When the reaction was run only 8.82 g of Cl2 was collected. The percent yield of Cl2 is_? a)58.8 % b)72.3 % c)29.4 % d)...
February 27, 2015

Calculus II
A square plate of side 3 m is submerged in water at an incline of 30 degrees with the horizontal. Calculate the fluid force on one side of the plate if the top of the plate lies at a depth of 6 m. (* The only thing i can think to use is the equation: p * g * (S from a to b of...
February 26, 2015