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June 24, 2016

Search: Calculus - not sure if my work is correct?

Number of results: 67,490

chemistry
The tomato is dropped. What is the velocity, v , of the tomato when it hits the ground? Assume 91.9% of the work done in Part A is transferred to kinetic energy, E , by the time the tomato hits the ground.
November 15, 2014 by maxime Jones

Chemistry
The tomato is dropped. What is the velocity, v, of the tomato when it hits the ground? Assume 94.7% of the work done in Part A is transferred to kinetic energy, E, by the time the tomato hits the ground.
December 7, 2014 by Caitlin

physical science
John is using a pulley to lift the sail on his sailboat. The sail weighs 150 N, and he must lift it 4.0 m. How much work must be done on the sail?
May 16, 2016 by bob

Calculus
Why can't a equal 1 in y=log(base a) x. And why is x always positive in that? Hmmmm. a^y=x (from the problem statement). If a were to equal 1, then x would be 1 (1 to any power is 1). So if a is not one, but a positive number, then x has to be a positive number, if one is ...
May 8, 2007 by Raj

Writing
what are some advantages competion has over corporation and some disadvantages ceompetion have?? Please reread your question and let us know what you really mean. I think you're asking about competition and something else, but I'm not sure. Maybe you just need to double-check ...
October 31, 2006 by Bryan

Precalculus
The light pattern from a fog light at the airport can be modeled by the equation x^2/4 - y^2/16=1. One of the points on the graph is at (3, 4.5) and one of the x-intercepts is -2. Find the coordinates of the three addditional points on the graph and the other x-intercept. I'm ...
October 8, 2007 by Alicia

English
I need help with starting my essay. These are the organization of my essay. I am not sure what to put for paragraph #2. *Broad subject-My name *Limited Topic for thesis statement-Learning to cope with my height *Main Idea about this topic- Advantages of being tall Paragraph #2...
July 11, 2011 by lizzie

finance
Can someone please help me with the following question. I am not sure even where to start. A 5-year annuity of 10 $9,000 seminannual payments will begin 9 years from now, with the first payment coming 9.5 years from now. If the discount rate is 11 percent compounded ...
February 24, 2008 by student

ap calc
A pool, that is 12 feet wide and 18 feet long, is to have a sidewalk of uniform length constructed around its perimeter. a. write the equation for the area A, of the pool with the sidewalk b. determine the domain of the area of the pool with the sidewalk c. what would the ...
October 10, 2009 by MUFFY

Stat
Coin box Question: Assume that there are 25 pennies, 10 nickels, 10 dimes, and 5 quarters in a box. after shuffeling the box, you pick a coin at random and note down its face value. let x represent the face value of the coin in cents. then construct the probability ...
November 2, 2009 by BRITT

Statistics
Coin box Question: Assume that there are 25 pennies, 10 nickels, 10 dimes, and 5 quarters in a box. after shuffeling the box, you pick a coin at random and note down its face value. let x represent the face value of the coin in cents. then construct the probability ...
November 2, 2009 by BRITT

MATH
Coin box Question: Assume that there are 25 pennies, 10 nickels, 10 dimes, and 5 quarters in a box. after shuffeling the box, you pick a coin at random and note down its face value. let x represent the face value of the coin in cents. then construct the probability ...
November 2, 2009 by BRITT

Chemistry
You are given three test tubes that contain colourless liquid. One test tube contains benzene, another contains ethanol, and the third contains 2,4-hexadiene. Design a procedure that will tell you the contents of each test tube. Describe your expected observations. So benzene ...
June 20, 2010 by Jamie

PSY 301 Adult Development & Life Assessment
I'm not sure where and how to begin to answer this question. I read the chapter but I'm still not coming up with how to answer it. I just need some help. When you look at the idea of life stages, can we place ourselves in any self determined or appointed life stages? Are some ...
May 16, 2012 by Anonymous

childcare
Which of the following exhibits adult supervision with full accountability? A. Checking in from time to time to make sure that the child is safe B. Self-care for the child in his or her own home setting C. Sending a child to lessons or other youth groups to be looked after D...
December 15, 2012 by Anonymous

Math
Micheal gave 1/12 of his money to Sally and 1/5 of his remaining money to Heidi. If he still had $704, how much money did he have originally? The answer is $960 I was told to take the fraction of what was left and multiply it by what Heidi took: 1/12 + (11/12 x 1/5) = 11/60 11...
October 13, 2014 by Jenny

Writing
Can This be read an let me know if have enough ideas/claims supported with enough examples? Did the essay presuade you to think a certain way? An does the organization/structure of the writing help the reader to identify the writer puporse? Successs is the fullfilment of your ...
November 2, 2006 by Bryan

English
1. I met her in mid July. 2. I met her in middle July. 3. I met her in late July. (Are all grammatical? Which one is correct #1 or #2?)
July 5, 2009 by John

calculus
this is an exploration in my textbook that we are assigned to do. it basically means we are supposed to use our graphing calculator to help. my calculator won't work for some reason so I'm trying to do it without and cannot figure it out. the question is really irrelevant to ...
January 1, 2015 by emilia``

Literature
11. Which of the following pairs of words may be used as an example of approximate rhyme? a. now and later b. crew and two c. again and friend d. applause and gauze C 13. The women in Walker's poem struggle on behalf of their a. employers b. friends c. teachers d. children D ...
November 22, 2009 by mysterychicken

Calculus
Use analytical methods to find the exact global maximum and minimum values of the function f(x)=8x-ln(4x) for x >0. If a global maximum or minimum does not exist, enter the word NONE. For the global maximum at x=none, But for the Global minimum at x=? Is the Global minimum ...
October 16, 2008 by George

Calculus Ladder Problem
A ladder 20 ft long rests against a vertical wall. Let \theta be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does x change with respect...
April 28, 2010 by Jennifer

PHYSICS
pete and john play a game of tug f war on a frictionless icy curface. pete weighs 539 N and john weights 392 N. during the course of the game, john accelerates toward pete at a rate of 3 m/s^2 a)what's the magnitude of the force that peter exerts on john? b)what's the ...
January 23, 2010 by samir

Calculus
Hi. In an integration solution, the integral of (1/(sqrt (8-u squared)) is written as arcsin(u/sqrt 8), but I dont see how they got it. When I did it I got (1/8)*(arcsin(u*sqrt8)). What I did was take sqrt8 common in the denominator to get it in the form sqrt(1-u sq.) and then...
December 5, 2009 by O_o Rion

calculus
a particle moves along a number line measured in cm so that its position at time t sec is given by s=72/(t+2) +k, k is a constant and t>=0 seconds. (a) Find the instantaneous velocity of the particle at t=4 seconds (b) Find the acceleration of the particle when t =4 seconds...
February 4, 2011 by nadra

calculus
given y = 4x-3 find the minimum value of xy. find the rate of change of xy with respect to x. find the rate of change of xy with respect to y.
January 6, 2008 by julie

Calculus
Find the derivative of y=5^(1-4x) lny=(1-4x)ln5 Can I split it? lny=ln5-4xln5 1/y dy/dx = -[4ln5/(4xln5)^2] dy/dx=-[4ln5/(4xln5)^2]y Thanks.
December 9, 2010 by sh

Calculus
Evaluate the integral. The integral from the square root of three over three to the square root of three of the function 6/(t^2+1)
April 12, 2012 by Michael

Pre calculus
Find the domain of the function. f(x) = sqrt 6-x A. (-∞, 6) (6, ∞) B. (-∞, sqrt6 ) (sqrt 6 , ∞) C. (-∞, sqrt6] D. (-∞, 6]
December 3, 2015 by Alex

English
I checked the sentence as you told me. I included a few other sentences I need to prepare on Poe. 1) In July 1814 the couple fled to France and later moved to Switzerland, where they rented a house on the banks of Lake Geneva. 2) Under the influence of her husband she was ...
December 12, 2011 by Henry2

ENGLISH
hy! Can somebody be so kind and correct my essay on " Being a surgeon is very stressful" I would really appreciate it, because my english is not perfect and I think I made some mistakes :) According to my opinion being a surgeon is one of the most stressful jobs in the whole ...
April 25, 2010 by Lulu

Calc III
Hello, Can somebody help me with the following two problems? 1. Find a value of a such that the vector <a, 1,1> makes an angle of 45 degrees with the vector <1,2,1> or show that no such a exists. ---I started by using theta = arccos (u*v)/(absu*absv) must equal (...
November 26, 2007 by Em

physics
A class of 11 students taking an exam has a power output per student of 122 W. Assume that the initial temperature of the room is 18.8oC and that its dimensions are 6.40 m by 14.5 m by 3.50 m. What is the temperature of the room at the end of 54.0 min if all the heat remains ...
November 10, 2012 by Chad

statistics
I have done an entire project based on football scores from a certain team over the last 3 years and I'm not sure what information I can get from my answers. Ive done a frequency distribution table, Ogive, Histogram,cumulative frequency table, frequency polygon, etc. and I don...
December 16, 2013 by Amy

Calculus
The point P(4,2) lies on the curve y=x^1/2 If Q is the point (x,x^1/2) use your calculator to find the slope of the secant line PQ for the following values of X: 1)3.5 2)3.9 3)3.99 4)3.999 5)4.5 6)4.1 7)4.01 8)4.001 i plugged these points into the intial equation and got that ...
September 25, 2007 by Judy

Calculus
Find the volume of the solid whose base is the region in the xy-plane bounded by the given curves and whose cross-sections perpendicular to the x-axis are (a) squares, (b) semicircles, and (c) equilater triangles. y=x^2, x=0, x=2, y=0 I know how to graph what is given, but I ...
December 15, 2007 by Anonymous

calculus
A Norman window has the shape of a rectangle surmounted by a semicircle. If the perimeter of the window is 30ft, find the dimensions of the window so that the greatest possible amount of light is admitted. I keep screwing up in creating my equation. p = perimeter of window l...
November 20, 2011 by Daniel

calculus
At a summer campfire, the radius of a marshmallow on a stick expands at the rate of \ {r ' (t)} = \frac{2.4 }{3 t + 6} mm/s where t is the time of heating in seconds. Initially the radius was 3.8 mm. Find the radius after 16 seconds using the following steps: When substituting...
March 8, 2014 by Marcus

english
Hey you :) Can you please read that letter to my host family? Can you maybe give me tips what I can add? what I don't have to say? And look up the grammer? Thank you Minnie Dear Host Family, My name is Minnie. Im 21 years old, my birthday is on 2nd September. I study to ...
June 5, 2013 by Minnie

Chemistry check
First, percent error can be negative, correct? Because in my lab I got -32%. Here are my questions that I need checked: 1. List possible manipulation errors that might contribute to the following errors in results: 1) obtaining a significantly larger amount of NaCl than was ...
February 13, 2007 by Jay

physics
please check my answers and help me with the first one. how can you charge an object negatively with only the help of a positively charged object? -This one I am not too sure, when one material is rubbed against another electrons jump readily from one to the other but protons ...
November 6, 2007 by Soly

PreCalculus
A kite has a lifting surface area of 630 square meters. Suppose the wind is blowing against the kite with a force of 100 newtons at an angle of 20 degrees above the horizontal. How much force is lifting the kite? I tried to draw a diagram, but I don't really understand what ...
March 8, 2009 by Katie

Trigonometry
I really need help with this trigonometry question.please any help is appreciated. 1.I have to draw the graph of y=cos x from 0deg to 360deg. 2.Be sure to show a table of vales similar to the this table. colum X l colum :y=sinx 0 l 0.00 pi/10 l 0.31 pi/5 l 0.59 3pi/10 l 0.81 ...
March 7, 2011 by anon

Politics
I'm writing a speech, and it's about the topic "Private sector investment is preferable to public sector investment for Human Space Exploration" I'm on the con side for this argument, and one of my reasons was that public sector will spur cooperation, while private sectors ...
September 18, 2011 by Anna

English/History
In Maus, what 3 times does Vladek almost die, but is saved? I feel like there are a ton of times he could have dies (being in the concentration camps alone is life-threatening enough), but I'm not sure what specific times Vladek was really close to death, but was saved? If ...
May 20, 2012 by Ellie

Physics
Here's the question: A 55 kg swimmer is standing on a stationary 235 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +4.3 m/s relative to the shore. Find the recoil velocity that the raft would have if there were no friction and resistance ...
December 10, 2012 by Christina

Chemistry
An 8.07g sample of impure Ag2O decomposes into solid silver and O2(g). If 395mL O2 is collected over water at 25C and 749.2mmHg barometric pressure, then what is the percent by mass of AgO2 in the sample? The vapor pressure of water at 25C is 23.8mmHg. Could someone help me ...
September 27, 2013 by Nancy

history
Ii need to find an actual newspaper report on Jack the Ripper. we have to show actual article with our work. I have tried to find this and have been unable to do so. Hope you can you help.
December 22, 2008 by frances

Algebra
Determine whether the given numbers are solutions of the inequality. t - 8 > 2t - 3 The given numbers are: 0, 3.3, -9, -3 I understand the problem and how to figure it out. Its just that when I tried this problem, none of the numbers worked. Did any work for you? Thanks in ...
January 15, 2009 by Carrie

Physics
Force F causes displacement d of a 20-Kg object starting from rest along a frictionless path. F= 10 N i + 50 N j + 15 N k and d= 10 m i + 60 m k A) Calculate the work done by the force. B) Calculate the angle between the vectors F and d. C) Calculate the final speed of the ...
April 22, 2009 by Sandhya

physics
a 0.85 kg block of aluminum is heated at atmospheric pressure so that its temperature increases from 22degC to 40degC. find the work done on the aluminum? find the energy added to it by heat? find the change in its internal energy?
February 2, 2010 by jenn

Algebra HELP:(
I am terrible at word problems. How do I work this? A large park is to be built in the shape of a rectangle. The length is to be 5 m shorter than three times the width. The perimeter of the park is to be 750 m. What will be the length and width of the park?
June 8, 2010 by bb

Chemistry
A pure sample of (R)-limonene has a specific rotation of +125.6. If a sample had a specific rotation of +35.6, how much of each enantiomer is present in the sample? Show your work. I dont even know where to begin....please help :(
November 8, 2011 by Adrianna

pre calc
the hour hand of a clock is 5 inches long and the minute hand is 6 inches long. Determine the distance between the tips of the hand at 11:40 p.m. please help i don't understand how to do this. if you work it out this will help alot
December 8, 2011 by jim

Math
A bottle contains at least 4 times as much juice as a glass contains. The bottle contains 32 fluid ounces. Write an inequality that shows this relationship. Please help me show your work please and thank you
February 21, 2012 by Amanda

Physics
a 65 kg sled starting from the rest slides down a 14 m high frictionless ramp. at the bottom of the ramp the sled encounters a level area that is not frictionless. how much work is done by friction to stop the sled?
April 16, 2012 by Kim

college algebra
Write an equation of the line parallel to the line given by 3x-2y=8 and having the same y-intercept as the line given by 2y+3x=-4 (show work) I am stuck with this problem. Can you please show me how to do these types of equations? Thank you
February 9, 2013 by Clay

Math
Coach Coleman is ordering hats for this year's teams. There are 6 teams. Each team has 12 players on the roster. He orders 12 more hats for the team managers. How many hats does he order in all? Show your work.
October 23, 2013 by Anonymous

algebra 2
the 2 unequalities -26<4k-2 and 2k-1<6 A. Write a compound inequality to combine the inequalities shown previously. and B. Solve the compound inequality for values of k. Show your work. Write your final answer as one inequality. please help
October 31, 2013 by hannah

Math-Trigonometry
Show that if A, B, and C are the angles of an acute triangle, then tan A + tan B + tan C = tan A tan B tan C. I tried drawing perpendiculars and stuff but it doesn't seem to work? For me, the trig identities don't seem to plug in as well. Help is appreciated, thanks.
November 6, 2013 by Sam

Customary units
A sculptor has a 3lb block of clay he adds 24 oz of clay to the block in order to make a sculptor. What is the total weight of the clay before he stars to sculp. (Have to show work)
December 9, 2013 by Car

physics
A 1,500 kg car starts from rest and accelerates to a speed of 12 m/s over a distance of 68 m a) calculate the total work on the car b) calculate the net force that caused the car to accelerate (constant force)
May 4, 2014 by cee

college physics
What work is done by a friction force acting on an object? Select one: a. Always negative b. Always positive c. May be positive or negative depending on the choice of coordinate system d. Always zero
May 26, 2014 by wes

maths
carl thought of 5 numbers and told danny all the sums that could be made by adding the numbers in pairs. the list of sums is given below. what are the five numbers 6,7,8,8,9,9,10,10,11,12 I thought of 34426 but the 11 does not work
October 30, 2014 by Yasmin

Physics please help me (:
Calculate the change in internal energy of a system if 25000 J of heat is added to the system while the system does 40000 J of work on its surroundings. Does this represent an increase or decrease of internal energy?
October 20, 2015 by Sammie

Math
Golds gym charges $150 to sign up and $10 per month. Fitness express charges not initial fee but charges $25 per month. When will the cost be the same? Show work please!!
October 27, 2015 by Michelle

Math
What is the approximate percentile rank of a lightbulb that failed at 9000 hours if the number of lightbulbs is 400? The number of lightbulbs that lasted between 5400 and 9000 were about 326 lightbulbs. The mean is 7800 and the standard deviation is 1200 My guess was: ...
December 5, 2012 by alice

Heallth Help NOW
which type of fat is not naturally found in foods and should be very used very little in your diet? A. monounsaturated fat B. Saturated fat C. trans fat D. unsaturated fat my answer is B is it correct.
January 26, 2015 by Vanessa16

Science
Plz correct me if I'm wrong!! Which of the following is a chemical property of aluminum? A.) The melting point of aluminum is 660 degrees C B.) The boiling point of aluminum is 2519 C C.) Aluminum does not dissolve in water D.) Aluminum reacts with oxygen
January 29, 2016 by Vanessa

Business Calculus
A manufacturer has found that marginal cost is dc/dx=3x^2-60x+400 dollars per unit when x units have been produced. The total cost of producing the first 2 units is $900. What is the total cost of producing the first 5 units? I would integrate, you are given at x=2 the cost, ...
December 3, 2006 by Lisa

calculus
Two positive numbers have a sum of 60. what is the maximum product of one number times the square of the second number? a) 3481 b) 3600 c) 27,000 d) 32,000 e) 36,000 So Idk if this is right, but I have .... x+y=60 p=xy^2 p=x(60-x)^2 P'=-2x(60-x)+(60-x^2) x=.5021 x= 119.498 idk...
December 14, 2010 by Jenny

Calculus
a pond that lies in a crater is being drained at the rate of 1000m3/min.If the crater has the shape of an inverted cone of radius 200(at he original water level) and original depth is 50 m (at the center) find that rate at which the water level begins to fall.How fast is it ...
March 12, 2011 by Mehak

Calculus
A balloon leaves the ground 500 feet away from an observer and rises vertically at the rate of 140 feet per minute. At what rate is the angle of inclination of the observer's line of sight increasing at the instant when the balloon is exactly 500 feet above the ground? Please ...
April 14, 2013 by Gabby

Pre-Calculus
Let f(x) be the function 1/(x+9). Then the quotient [f(5+h)−f(5)]/h can be simplified to −1/(ah+b). What does a and b equal to? So I understand the overall concept, and did f(5+h) = 1/(14+h) and f(5) = 1/14. Then to subtract the two, you get the common denominator ...
October 18, 2013 by Ann

calculus
A wire 360cm is cut into two pieces.One piece is formed into a square and the other is formed into a circle.If two figures have the same area,what are the two lenghts of two pieces of wire( to the nearest hundreth of centimeter?,show all the necessary working clearly.
November 10, 2014 by Mandla

pre-calculus 11
I have a question that two ski decide to have a race. I need show a graph of height versus time of the two skiers going over a jump. I am assuming that both skiers graphs would be parabola's and have a maximum height with both graphs opening downward.
June 16, 2015 by george

american government
Through the grants of power in Constitution,the Framers sought to: a)define the powers of state government b)create a government in which sovereignty was invested in the national government only c)enumerate the rights of individuals d)both empower government and limit it. IS B...
June 23, 2010 by vedrana

chemistry
1. Calcuate the distance(km) from the Earth to the Moon if it takes light 1.3 seconds to make the trip? 2. Saturn is about 1.2 billionkm from Earth. How long does it take light to travel that distance? (I was only given the wave equation, Max Plancks equation, De Broglies ...
November 11, 2015 by Brooke N

Science
A man drinks a bottle of beer and proposes to work off its 460 kj by exercising with a 20 kg barbell. If each lift of the barbell from chest height to over his head is through 60 cm and the efficiency of his body is 10 percent under these circumstances, how many times must he ...
August 31, 2007 by Michele

thermodynamic
The air 10 cm diameter cylinder, as shown below, is heated until the spring is compressed 50mm. Find the work done by the air on the frictionless piston. The spring as the beginning of this process has a displacement of 0.0m with a spring constant of K=10KN/m. (assume Patm=101...
January 9, 2011 by chris

thermodynamic
The air 10 cm diameter cylinder, as shown below, is heated until the spring is compressed 50mm. Find the work done by the air on the frictionless piston. The spring as the beginning of this process has a displacement of 0.0m with a spring constant of K=10KN/m. (assume Patm=101...
January 9, 2011 by chris

physics
I have 2 fill in the blanks that I need help with. 1) When electrons are forced away from a/an ___ plate, work is done. could the answer be positive? 2) Any pointed or angular surface of an object must have a/an ___ concentration of charge to establish equilibrium. I do not ...
April 10, 2011 by Kriti

Business English
Buying time with limited agreement is a useful strategy when you: A. Have too much work to do. B. Cannot think of anything to say. C. Want to avoid escalating a conflict but do not agree with other person D. Know that the presenting problem is not the real problem but do not ...
October 23, 2011 by Diana

physics
i need help i dont understand how to do this problem so please help me. A student lifts a 5kg chair 0.8m off the floor, walks at a constant speed for a distance 10m, and then puts the chair back down on the floor. calculate the total amount of work done on the chair.
November 7, 2011 by pinky

chem30
what is the molar enthalpy of combustion for magnesium? calimetry experiment results 100.0ml of HCl with 0.31g of Mg ribbon temp before ribbon added 23degrees and after ribbon added 37degrees. Need to show work so I understand. q=mcdeltaT
March 7, 2013 by redeye

Physics
A 54.0-g Super Ball traveling at 29.0 m/s bounces off a brick wall and rebounds at 18.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 4.00 ms, what is the magnitude of the average acceleration of the ball during this time interval in ...
September 2, 2014 by Grant

statistic
Of all mortgage foreclosures in the United States, 50% are caused by disability. People who are injured or ill cannot work--they then lose their jobs and thus their incomes. With no income, they cannot make their mortgage payment and the bank forecloses. 14 mortgage ...
November 10, 2015 by Anonymous

Physics
1. A steam engine converts 150 kg of water completely to steam. The process involves transfer of 4 x 10^8 J as heat. If steam escaping through the safety valve does 2 x 10^8 J of work against outside atmosphere, the net change in the internal energy is: a. 2 J b. 2 x 108 J c. ...
December 21, 2015 by Isabella

physics
A rope attached to a truck pulls a 180-kg motorcycle at 9.0 m/s. The rope exerts a 400-N force on the motorcycle at an angle of 15∘ above the horizontal. What is the work that the rope does in pulling the motorcycle 300 m? Express your answer with the appropriate units.
December 14, 2014 by Myah

calculus
Help - I have three problems that I am stuck on - 1. Lim x approaches infinity (x-3/x squared + 4) 2. Lim x approaches 3 x cubed - x squared - 7 x +3/ x squared - 9 3. Lim x approaches negative infinity (x + square root x squared + 2x)
October 27, 2008 by Jane

Calculus
If m ≤ f(x) ≤ M for a ≤ x ≤ b, where m is the absolute minimum and M is the absolute maximum of f on the interval [a, b], then m(b − a) ≤ b f(x) dx a≤ M(b − a). Use this property to estimate the value of the integral. The ...
April 9, 2012 by Michael

Calculus
Find the arc length of the curve 𝑥(𝑡)=cos𝑡+𝑡sin𝑡, 0≤𝑡≤𝜋/2 𝑦(𝑡) = sin 𝑡 − 𝑡 cos 𝑡 ^2
April 18, 2016 by Desperate Student

History Pls help me
Sonya writes an essay about children in the early 1800s: Children in the early 1800s faced a lot of hard work. They usually had to help their families with household chores. These chores included gardening, sewing, and caring for other children. When their parents got sick, ...
January 8, 2016 by Aaliyah

Chemistry Very Urgent!!
A 0.035 M solution of a weak acid (HA) has a pH of 4.88. What is the Ka of the acid? HA ==>H^+ + A^- Ka = (H^+)(A^-)/(HA) pH = -log(H^+) You know pH. Convert that to (H^+). (H^+)=(A^-) so plug those into the expression for Ka. (HA) = 0.035 M - (H^+). Plug that in. Calculate...
April 2, 2007 by Paul

algebra
3x-5(3x-7)= 2(x+9) + 45 You won't learn unless you try these yourself. Multiply out the term in parentheses, combine the x terms together and the constants together, and then put all the x terms on one side of the = and the constants on the other. Show your work and we will ...
April 24, 2007 by Anonymous

Math
Kevin's wife picks him up after work every day at 5:30 pm. One day, he leaves at 4:58 pm, and starts walking home. She pick him up along the way , and when they get home, he notices that they saved four minutes. How long did Kevin walk? :)
October 1, 2007 by Chris

Greens Theorem
Can someone show me step by step how to work this problem out please. Let C be the triangle with vertices (0,0), (1,0), and (1,2). Find the following line integral by two methods, directly and using greens theorem. 2xy^2dx + yx^2dy Thanks!!!
December 10, 2007 by julia

physics
Three moles of an ideal gas are compressed from 5.5*10^-2 to 2.5*10^-2 m^3. During the compression, 6.1*10^3J of work is done on the gas, and heat is removed to keep the temperature of the gas constant at all times. Find the temperature of the gas. Can anyone please give me ...
March 2, 2008 by Stella

PHYSICS
Three moles of an ideal gas are compressed from 5.5*10^-2 to 2.5*10^-2 m^3. During the compression, 6.1*10^3J of work is done on the gas, and heat is removed to keep the temperature of the gas constant at all times. Find the temperature of the gas. Can anyone please give me ...
March 2, 2008 by sTELLA

IT
identify at least two data structures that are used to organize a typical file cabinet. why do you feel it is necessary to emulate these types of data structures in a computer program. For what kind of work project would you want to use this type of program?
July 22, 2008 by micheal

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