Monday

August 31, 2015
Total # Posts: 2,242

**cheistry**

Fractional distillation is suitable for separation of miscible liquids with a boiling point difference of about 25 K or less. What part of fractional distillation apparatus makes it efficient and possess an advantage over a simple distillation process. Explain using a diagram.
*August 21, 2015*

**Physics**

The stoplights on a street are designed to keep traffic moving at 34 mi/h. The average length of a street block between traffic lights is about 80 m. What must be the time delay between green lights on successive blocks to keep the traffic moving continuously? There are 1.609...
*August 20, 2015*

**Physics**

On a drive from your home to town, you wish to average 44 mph. The distance from your home to town is 106 miles. However, at 53 miles (half way), you find you have averaged only 33 mph. What average speed must you maintain in the remaining distance in order to have an overall ...
*August 20, 2015*

**maths**

x^2+y^2=25^2 2x+2y.dy/dx=0 dy/dx=-x/y dy/dt=dx/dt.dy/dx =(0.3).(-x/y) =(0.3).(-15/20) =-0.225m/s
*July 24, 2015*

**Math**

z2(pi)rh=2(0.064)2(pi)r + 0.064(2*pi*h) z2*pi*r^2= 0.064(2*pi*r) pi*r^2h=1567.8 Find z,r,h
*July 22, 2015*

**Differential Equation**

(xD-1)D
*July 7, 2015*

**Math**

Show that the curve with parametric equations x=tcost, y=tsint, z=t lies on the cone z^2=x^2+y^2
*July 5, 2015*

**Math**

4x-e^(-(4x-y+3))=-e^(-2) y=________ I have tried multiple times and cant get it. Please help
*June 24, 2015*

**Math**

Thank you!
*June 24, 2015*

**Math**

e^(x-y)=-x+C where y(2)=2 so I found C=3? y=_____________ so I thought it would be y=-ln(-x+3)-x but that is wrong please help!
*June 24, 2015*

**psy 410**

1. Which of the following is NOT usually one of the effects of abuse on a child?
*June 18, 2015*

**Differential equation**

well when I set it up i get Ce^(-5ln(x+4))*integral(e^(5ln(x+4)*(16/(x+4)^2) which i think brings me to Ce^(-5ln(x+4))*(4(x+4)^4) which would simplify to: Ce^(-5ln(x+4))+(4/(x+4)) am I doing the process right because this is where I am getting stuck. I understand the ...
*June 15, 2015*

**Differential equation**

A first order linear equation in the form y′+p(x)y=f(x) can be solved by finding an integrating factor μ(x)=exp(∫p(x)dx) (1) Given the equation (x+4)^2y′+5(x+4)y=16 find μ(x)= I found it to be e^(5ln(x+4))which is correct** (2) Then an explicit ...
*June 15, 2015*

**Area/volume of hollow figure**

A hollow box 10x10in with a thickness of 1in with a length of 500 Would the area be (10*10) Would the volume be ((10*10)-(9*9))*500
*June 15, 2015*

**case study**

Fred and Zuma Palermo contacted Colorado Carpet Installation, Inc., for a price quotation on providing and installing new carpeting and tiling in their home. In response, Colorado Carpet submitted a written proposal to provide and install the carpet at a certain ...
*June 13, 2015*

**Differential equation**

y′=12x^(3)sqrt(1+x^4)(1+y^2), y(0)=1 ⇒ y= Thanks!
*June 12, 2015*

**Differential equation**

awesome! thank you so much! I see where I went wrong! Would it be ok if I asked you another one I am having trouble with?
*June 12, 2015*

**Differential equation**

y′=8e^(4x)(1+y2)solve for y(0)=−2 ⇒ y= I tried to solve the problem and got the equation: tan^-1((2e^(4x)-2+tan(-2)))it says I am wrong and I resolved and got the same thing I must be doing something wrong please help!
*June 12, 2015*

**Basic Differential Equation**

I cant really follow how you got your work...
*June 5, 2015*

**Basic Differential Equation**

Hi all. I need help understanding something my book dosn't go over well. For example dy/dx=-4y is a given solution and I need to find the differential equation. I simply isolate y then integrate. Getting y=e^(-4x) which is correct. My question is for something like (d^2y...
*June 5, 2015*

**LA**

1 a 2a 3 d 4 c
*June 3, 2015*

**algebra**

Find the equation of a horizontal line that goes through the point (5, -3). Explain your answer
*May 12, 2015*

**chemistry**

How much of a 6.0M sucrose solution should you use to make 77.0mL of a 0.055M solution?
*May 8, 2015*

**Calculus**

Find the average value of the function f(x)= 8/ (3+x)^2 on the interval [0,2]
*May 6, 2015*

**Calculus**

A cable that weighs 3 lb/ft. is used to lift a golf cart which weighs 700 lbs up to the deck of a boat which is 300 ft above a loading dock. Find the work done.
*May 6, 2015*

**Calculus**

The region bounded by y= e^x, y=0, x= -1 and x=1 is rotated about the x-axis, find the volume generated.
*May 6, 2015*

**Calculus**

Find the volume of the solid obtained by rotating the region bounded by y= x^(1/3), and y= x about the line y=1
*May 6, 2015*

**Calculus**

Find the volume of the solid obtained by rotating the region bounded by y= x^2, y=0, and x=3 about the x-axis.
*May 6, 2015*

**Calculus**

Find the area of the region bounded by the curves y=x^2 - 2x and y= x + 4
*May 6, 2015*

**Econ**

I think it is A & C, but am not sure.. In a perfectly competitive market in which no market failure occurs and no government policy interferes with the equilibrium price and quantity: a. deadweight loss is zero b. the sum of producer and consumer surplus is maximized c. ...
*April 25, 2015*

**Microecon**

Juan mows lawns in his neighborhood for extra money. Suppose the demand for lawn mowing in Joe’s neighborhood is: QD = 48 – 2P and that the supply of lawn mowing (Juan’s willingness to mow lawns) is: Qs = -12 + P. The market-clearing price of lawn mowing is $...
*April 25, 2015*

**Interest**

Jim opens a savings account with a deposit of $10,000. If the account has an annual interest rate of 6%, compounded quarterly, how much is in the account after one year? (Assume that he does not make any withdrawals. Round only your final answer to the nearest cent.)
*April 24, 2015*

**math**

A boat leaves port P and steers 5 km due east and then 10 km on a bearing of 060 degrees. Find its distance and bearing from P
*April 19, 2015*

**Math**

Jennifer rode her bike to the store at a rate of 15 mph. She rode back home at a rate of 10 mph. How far is it to the store if the round trip takes an hour?
*April 19, 2015*

**Science**

Simply standing. 71.1kg.
*April 19, 2015*

**Science**

Estimate the pressure that is exerted on the ground by an average female. In runners? and then In "high heels"?
*April 19, 2015*

**PHYSICS**

Determine the resulting temperature when 1kg of ice at 0 Degree celcius is mixed with 9kg of water.
*April 12, 2015*

**PHYSICS**

In a power plant the high pressure turbine trips due to an unauthorised valve shutdown. What are a) what is the angular acceleration of the turbine blade? b) what is the distance travelled by a point on the rim of the turbine blade during the acceleration? c) what is the ...
*April 9, 2015*

**Math**

[1 0 -5 0 1 3 0 0 0]
*April 9, 2015*

**Math**

A. you have one independent event then make a choice dependent on that. wrong answer. B. Two independent events, correct answer. C. The chance a person who is not yet picked increases as more and more people get picked, dependent event, wrong answer. D. Same as C, dependent ...
*April 8, 2015*

**Business math**

At the beginning of each year, Al rose invested $1,200 semiannually at 12 percent for 8 years. The cash value of the annuity due at the end of the eighth year is?
*April 7, 2015*

**physics**

An elevator and its load have a combined mass of 1962 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 7.5 m/s, is brought to rest with constant acceleration in a distance of 4.2 m.
*April 6, 2015*

**physics**

a 50g slug is shot from a rifle at 900m/s a) what is the KE of the slug? b) how much work is done on the slug if it starts from rest?
*March 30, 2015*

**phusics**

oil is pumped at 31000/liters/min into a tank 25m above the ground.(1lter of oilhas a mass of 0.68kg) a) what power, in kw, must be delivered by the pump? b)what is the increase in PE of ht eoil after 10 minutes? c)Find the increase in PE of the oil after 10minutes if the tank...
*March 30, 2015*

**phusics**

a 2200kg car accelerates from 5m/s to 17m/s in 3 seconds. a) find the work done on the car in this time period. b)find the average power delivered by the engine in this time interval.
*March 30, 2015*

**math**

Find the angle of inclination of the equation 3x+2y+4=0
*March 22, 2015*

**algebra**

The sum of a number and three times another number is 18. Find the number if their product is a maximum.
*March 18, 2015*

**Cal state**

A movie theatre has 30 rows. The first row has 26 seats and as you move to the back each additional row has one seat added. How many seats are in the theatre?
*March 18, 2015*

**Physics**

A solid sphere, a hoop, and a solid disk. all with equal masses and radii, roll at the same translational speed along a horizontal surface toward a ramp inclined at a 30 degree angle. Which of the three will make it furthest up the ramp before it stops and begins to roll back ...
*March 18, 2015*

**chemistry**

I found 3.39 mols of HF and 0.56 mols of CaSiO3 but I'm confused what is the limiting reactant. It would be CaSio3 because it has less moles than HF?
*March 15, 2015*

**chemistry**

CaSiO3(s) +6 HF (g)-> CaF2(aq) + SiF4 (g) + 3 H2O(l) If a 65.6 g sample of CaSiO3 is reacted in an inert 83 L container at 25.5°C with HF at 1.00 atm pressure find the following. a. the mass of water, and CaF2 produced in the reaction and the mass of HF that remains. b...
*March 15, 2015*

**Math**

nvm
*March 8, 2015*

**Math**

if you look this up open study name a pair of complementary angles its the first result click on it the image is omarios reply
*March 8, 2015*

**Math**

Use the figure to answer the following questions. figure for questions 1–3 1. Name a pair of complementary angles. (1 point) angle sign1 and angle sign4 angle sign1 and angle sign2 angle sign3 and angle sign4 angle sign1 and angle sign6 2. If mangle sign1 = 37°, what ...
*March 8, 2015*

**Math**

a) Write an expression in terms of n and m for the area of the top of the solid region being drilled at the right. Use 3.14 for x. Factor your expression. b) Find the area of the solid region in n=10 in. and m=3 in.
*March 6, 2015*

**ela**

Ms. Sue do not you think that he, as all people do, deserve 3rd guesses? And even if you did not want to you should tell him in a nicer way.
*March 5, 2015*

**Statistics**

Science scores for high school seniors in the United States are normally distributed with a mean of 78 and a standard deviation of 10. Students scoring in the top 10% are eligible for a special prize consisting of a laptop and $2,000. What is the approximate cutoff score a ...
*February 28, 2015*

**Physics**

two small spheres lie 1.5 meters apart and carry identical charges. How large is the charge on each if a sphere experiences a force of 2.0 N.
*February 24, 2015*

**HELP getting gray hair with this one**

Pregnancy Test Results Positive Test Result (Pregnancy is indicated) Negative Test Result (Pregnancy is not indicated) Subject is pregnant 80 5 Subject is not pregnant 3 11 a) Based on the results in the table, what is the probability of a women being pregnant if the test ...
*February 23, 2015*

**English- Mr Pip**

Oh aha thanks anyway!
*February 22, 2015*

**English- Mr Pip**

Sorry, no, Mr Pip, a book based upon the reading of Great Expectations.
*February 22, 2015*

**English- Mr Pip**

I'm thinking of ideas for my Mr Pip ideas and a theme I came across was lies and lying in the book. I would really appreciate it if you could give me some more examples of lies in the book that I can review. Thanks! What I have so far (Spoilers): -Mr Watts says that he is...
*February 22, 2015*

**Last help Thanks **

Karen claims that the odds against randomly drawing the letter S from the letters in the word MISSISSIPPI are 4:7. How do you respond?
*February 20, 2015*

**help please**

A student wants to know why if the odds in favor of an event are 3:4, the probability of the event occurring is not 3/4 How do you respond?
*February 20, 2015*

**Satistics Help**

A student claims that if the odds in favor of winning a game are a:b, then out of every a+b games she would win a games. Hence, the probability of the event of winning the game is a/b+b Is the student's reasoning correct? why or why not?
*February 20, 2015*

**statistics**

When drawing a histogram, it is important to a. eliminate the extremes to minimize the effect of skewness. b. choose class intervals, so they all have the same number of observations c. make sure that the mean and the median fall in the same class interval, so that the correct...
*February 20, 2015*

**math**

a recipe calls for 2/3 cup of flour i am making a amount that is 3/7 of the recipe how much flour do i need
*February 19, 2015*

**Science**

I got 100% thx
*February 19, 2015*

**alg 1**

the perimeter of a rectangle is 24 m. the width is 30 m less than five times the length. find the dimentions of the rectangle.
*February 13, 2015*

**chemistry**

how many grams of calcium bicarbonate would it take to reach a ph of 7 if i have 10ml 3 molar sulfuric acid?
*February 10, 2015*

**Math**

After a busy day of orders, a florist has 6 roses, 7 lilies, 3 carnations, 35 chrysanthemums, 27 sunflowers, 18 violets, and 9 tulips left in her inventory. Part A: Write a ratio that compares the number of roses to the number of violets. Part B: Describe what three other ...
*February 9, 2015*

**math**

An object is thrown vertically so that its height in feet above the ground x seconds after it is thrown can be found using the following quadratic function f(x)=-16x^2+64x+80
*February 9, 2015*

**MATH**

Assuming the interest is compounded annually. You are finding the interest 21 times. There is a formula for it that you can certainly Google or you can just simply take the amount 300*(1.055)=SUM and do the same to the sum each time SUM*(1.055). I believe its answer is 923.47...
*February 7, 2015*

**Chem/Hydrocarbons**

So for methane through decane determining and drawing the isomers should be straight forward? Im just unsure as how to determine what makes them unique and if the structure and such matter in terms of location. If that makes any sense haha...Thanks for responding by the way
*February 7, 2015*

**Chem/Hydrocarbons**

Determining and naming the unique isomers of a hydrocarbon? Please help!? Hey all. I am studying a petroleum fluids class and am having difficulty in understanding one topic. Specifically, in some cases we are asked to draw and name the unique isomers of a certain compound. ...
*February 7, 2015*

**physics**

A space satellite has a total mass of 500kg. A portion of mass 20kg is ejected a velocity of 10ms-1 . Calculate the recoil velocity of the remaining portion (ignoring the initial velocity of the satellite).
*February 2, 2015*

**Chem**

a solution is prepared by dissolving 0.47 g of a solute in 12.7 g of cyclohexane what is the freezing point change
*February 1, 2015*

**Chem**

a solution is prepared by dissolving 0.47 g of a solute in 12.7 g of cyclohexane what is the freezing point change
*February 1, 2015*

**Chem**

a solution is prepared by dissolving 0.47 g of a solute in 12.7 g of cyclohexane what is the boiling point
*February 1, 2015*

**10th algebra**

x2+22x +c find the value of c that makes the trinomial a perfect square
*January 28, 2015*

**math**

Emma is using connecting cubes to make a rectangular model with a height of one connecting cube. With her cubes she can make the model in exactly 3 different ways. If Emma has more than 12 but fewer than 17 cubes, how many cubes does she have?
*January 23, 2015*

**physics**

HENRY, it's a good job.
*January 23, 2015*

**physics**

A copper telephone wire has essentially no sag between poles 30 m apart on a winter day when the temperature is −16◦C. How much longer is the wire on a summer day when the temperature is 26 ◦C? Assume that the thermal coefficient of copper is constant ...
*January 22, 2015*

**5th grade math**

Julian wants to put a border around two sides of his rectangular shaped garden. he has a 12 foot piece of lumber that will be cut into 1/3 foot pieces. how many 1/3 foot pieces can Julian cut from the lumber? 12 divided by 1/3
*January 13, 2015*

**statistics**

Statistics students were asked to go home and fill a 1-cup measure with raisin bran and to tap the cup gently on the counter 3 times to settle the contents. Then, if necessary, add more raisin bran to bring the contents exactly up to the 1-cup line. Once at the 1-cup line, the...
*January 13, 2015*

**Language arts**

Ms. Sue i never thought that i would hear such language from anyone on jiskha, much less you!
*January 7, 2015*

**mathematics**

If there are 18 elements in a set how many possible subsets of 6 can I get
*January 3, 2015*

**math**

How many subset of 6 can I get from 18 elements
*January 1, 2015*

**Lotto**

Next winning
*December 22, 2014*

**Physics**

An attack helicopter is equipped with a 20 mm cannon that fires 116 g shells in the forward direction with a muzzle speed of 819 m/s. The fully loaded helicopter has a mass of 4870 kg. A burst of 96.2 shells is fired in a 4.51 s interval. What is the resulting average force on...
*December 17, 2014*

**Calculus**

If the y-coordinate at each point of inflection on the curve y=e^(-x^2) is 1/e^a, then a = ?
*December 10, 2014*

**Physics**

An 11 kg object moves down a 25 degree incline at a constant speed. what is the magnitude of the coefficient of friction? I have m=11.0kg incline = 25 deg but i feel like I am missing one more number in order to calculate
*December 10, 2014*

**Math**

A taxi charges $1.00 for the first mile and $.20 for an additional 1/6 of a mile. How far can you travel for $5.00.
*December 4, 2014*

**physics **

If the acceleration due to gravity on the earth is 9.8 m/s2, what is the acceleration due to gravity on Rams?
*December 4, 2014*

**Thermodynamics**

Drawing a blank studying last minute for an exam: when does a piston cylinder not follow the 2nd law of thermodynamics!!!!
*November 25, 2014*

**pt1420 **

if the expression is false, the_____ operator will return true.
*November 24, 2014*

**Chemistry 211**

Which of the following statements is a reasonable explanation for why a percent yield may be less than 100% for the synthesis of the alum, select all that apply. a) The aluminium foil did not completely react b) Some alum sample remained in the beaker and was not transferred ...
*November 24, 2014*

**Physics**

A lathe, initially at rest, accelerates at .60 rad/s^2 for 10s, then runs at a constant angular velocity for 20s, and finally decelerates uniformly for 10s to come to a complete stop. What is its average angular velocity?
*November 23, 2014*

**Physics**

A boy wants to throw a ball into his friend’s window 16.0 m above. Assuming it just reaches the window, he throws the ball at 55.0° to the ground. At what velocity should he throw the ball?
*November 23, 2014*

**Physics**

A lathe, initially at rest, accelerates at .60 rad/s^2 for 10s, then runs at a constant angular velocity for 20s, and finally decelerates uniformly for 10s to come to a complete stop. What is its average angular velocity?
*November 23, 2014*