Wednesday
April 16, 2014

Homework Help: College

Post a New Question | Current Questions

college alg.
recall that for the general quadratic, max y is at x = -b/2a. In this case, at t=7.1/9.8 Just plug that in to get s.
Tuesday, April 8, 2014 at 1:41pm

college alg.
An event in the Summer Olympics is 10-meter springboard diving. In this event, the height s, in meters, of a diver above the water t seconds after jumping is given by s(t) = –4.9t2 + 7.1t + 10. What is the maximum height that the diver will be above the water? Round to ...
Tuesday, April 8, 2014 at 1:31pm

college alg
well, just plug in your numbers and solve for t when the height is zero: -16t^2 + 184t = 0 just a good old quadratic equation.
Tuesday, April 8, 2014 at 12:57pm

college alg
The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height, v0 is the initial velocity, and t is the time. Find the time for a projectile to return to Earth if it has an initial velocity of 184 ft/s.
Tuesday, April 8, 2014 at 12:35pm

college alg.
Different initial up speed but use : http://www.jiskha.com/display.cgi?id=139​6965991#1396965991.1396967805
Tuesday, April 8, 2014 at 11:33am

college alg.
The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height, v0 is the initial velocity, and t is the time. Find the time for a projectile to return to Earth if it has an initial velocity of 184 ft/s. ____________ s
Tuesday, April 8, 2014 at 11:32am

college algebra
h = hi + Vi t - (1/2) g t^2 in ancient English units this is h = Hi + Vi t - (1/2) 32 t^2 If Hi = 0 Vi = 128 ft/s then h = 128 t - 16 t^2 for h = 144 144 = 128 t - 16 t^2 16 t^2 - 128 t + 144 = 0 t^2 - 8 t + 9 = 0 t = [ 8 +/- sqrt(64 -36) ]/2 t = 4 +/- sqrt 7 t = 1.35 t = 6.65
Tuesday, April 8, 2014 at 10:36am

college algebra
So you are solving: 144 = 128t - 16t^2 16t^2 - 128t + 144 = 0 t^2 - 8t + 9 = 0 I will complete the square, (in this case faster than the formula) t^2 - 8t + 16 = -9+16 (t-4)^2 = 7 t-4 = ±√7 t = 4 ± √7 I get appr 6.65 and 1.35
Tuesday, April 8, 2014 at 10:29am

college algebra
The height of a projectile fired upward is given by the formula s = v0t – 16t2, where s is the height, v0 is the initial velocity and t is the time. Find the times at which a projectile with an initial velocity of 128 ft/s will be 144 ft above the ground. Round to the ...
Tuesday, April 8, 2014 at 10:06am

college physics
191.1
Tuesday, April 8, 2014 at 5:04am

College Physics
F1 = 8.2N[125o] F2 = 6.40N[233.4o] A. Fx = 8.2*cos125 + 6.40*cos233.4 = -8.519 N. B. Fy = 8.2*sin125 + 6.40*sin233.4 = 1.579 N. C. F^2 = -8.519^2 + 1.579^2 = 75.07 F = 8.66 N. D. Tan Ar=Fy/Fx = 1.579/-8.519=-0.18535 Ar = -10.5o = Reference angle. A = -10.5 + 180 = 169.5o = 10....
Monday, April 7, 2014 at 5:59pm

Macroeconomics
Which of the following are examples of debt overhang? Which examples are likely to lead to a cutback in spending? Explain. a. Your uncle starts a restaurants, borrowing to fund his investment. The restaurant fails, and your uncle must shut down but still must pay his debt. b. ...
Monday, April 7, 2014 at 3:57pm

college algebra
If a 25 lb weight is attatched to a spring how far will it stretch? I got an answer for a 15 lb weight with 8 inches to be 15/8 but when I plug in 15/8 into my new equation it doesn't come up with the right answer.
Monday, April 7, 2014 at 1:13pm

college pre-calculus
f
Monday, April 7, 2014 at 12:47am

Physics
pls let the answer be at the end of this - sad college student
Sunday, April 6, 2014 at 11:03pm

College Chemistry (DrBob222)
Ahhhh, now it's all clear! Thank you!
Sunday, April 6, 2014 at 10:35pm

Stats
the average placement test score of a sample of 64 students out of 1000 registered at a community college is 70 with a standard deviation of 15. Construct a confidence interval with a 5% chance of error.
Sunday, April 6, 2014 at 10:04pm

College Chemistry (DrBob222)
Yes, if you follow my directions above that will calculate Fe^2+. You have Eocell and Ecell which allows you to calculate Q. Then Q has the definition I gave and that has the concentrations in it. Q = (Fe^2+)/(Cu^2+). You know Q and Cu^2+, solve for Fe^2+. If you need help in ...
Sunday, April 6, 2014 at 9:46pm

College Chemistry (DrBob222)
Thank you very much, but the problem indeed says 35 degree C. I was wondering if there is a way to calculate the Fe2+ (aq)?
Sunday, April 6, 2014 at 9:13pm

College Chemistry (DrBob222)
I presume you meant 25C and not 35. If you meant 35 then replace the 0.0592 below by (RT/2*F) Ecell = Eocell -(0.0592/2)log Q You have Ecell. Eocell = Eo for Cu^2+ + 2e --> Cu and add to Eo for Fe(s) ==> Fe^2+ + 2e That leaves Q. Q in this case is Q = (Fe^2+)/(Cu^2+) ...
Sunday, April 6, 2014 at 9:06pm

College Chemistry (DrBob222)
Use the Nernst equation to calculate the iron (II) concentration for the following iron/copper electrochemical cell when [Cu2+] = 0.012 M and Ecell = 0.750 V at 35°C. Cu2+ (aq) + Fe (s) --> Cu (s) + Fe2+ (aq)
Sunday, April 6, 2014 at 8:55pm

college physics
dsf
Sunday, April 6, 2014 at 8:42pm

College Physics
A
Sunday, April 6, 2014 at 7:36pm

math
Mr. Benedict left half of his estate to his wife, one-fourth to his son, one-fifth to his daughter and the remainder, $5000 to his college. What is the total amount left by Mr. Benedict? a. $ 9,250 b. $ 10,000 c. $ 16,000 d. $ 50,000 e. $ 100,000 please answer and explain
Sunday, April 6, 2014 at 6:25pm

Statistics
1. For the following research question, specify the parameter and give the null and alternative hypotheses. "Is there a difference in the proportions of male and female college students who smoke cigarettes? 2. For the following research question, specify the parameter ...
Sunday, April 6, 2014 at 4:04pm

History
What higher education institution were established to assist blacks during reconstruction? is it college?
Sunday, April 6, 2014 at 10:57am

college chem
That's what I would do.
Saturday, April 5, 2014 at 5:56pm

college chem
Determine the molar solubility of AgBr (Ksp = 5.40e-13) in 2.502 M NH3 if the complex ion [Ag(NH3)2]+ forms with a Kf = 1.70e7 will I need to make an chemical equation using the compounds they give me? and then do an ICE table?
Saturday, April 5, 2014 at 5:44pm

college chemistry
Convert each of the Kb values to pKb = -log Kb and convert those to pKa by pKa + pKb = 14 The closest pKa values to the desired pH is the one you want.
Saturday, April 5, 2014 at 5:31pm

college chem
millimols NaOH = mL x m = 17.47 x 0.1 = 1.747 millimols HA = 25 x 0.1 = 2.5 .........HA + NaOH ==> NaA + H2O I........2.5....0.......0......0 added.........1.747............ C......-1.747.-1.747...1.747.....1.747 E......0.753....0......1.747 Substitute into the Henderson-...
Saturday, April 5, 2014 at 5:19pm

college chem
What would the [OH-] be after addition of 17.47 mL of 0.1000 M NaOH to 25.00 mL of 0.1000 HA (a weak acid, Ka = 3.16e-4)?
Saturday, April 5, 2014 at 4:32pm

college chemistry
Which base listed below would be the best to creat a buffer having a pH of 5.0230? hydrazine, Kb = 8.90e-7 methylamine, Kb = 3.70e-4 ethanolamine, Kb = 3.20e-5 pyridine, Kb = 1.40e-9
Saturday, April 5, 2014 at 1:50pm

College Physics
Two forces, F⃗ 1 and F⃗ 2, act at a point, as shown in the picture. (Figure 1) F⃗ 1 has a magnitude of 8.20N and is directed at an angle of α = 55.0∘ above the negative x axis in the second quadrant. F⃗ 2 has a magnitude of 6.40N and is ...
Saturday, April 5, 2014 at 6:48am

college algebra
Assuming that you mean squared (2x10^2)(3.5x10^2)= 200*350= 70,000= 7*10^4
Friday, April 4, 2014 at 4:08pm

CHEM ABSTRACT
Depends on the lab. High school labs should run no more than 100 words, college maybe 200 words. I could write many descriptive HS labs in 50 words. <<The body of the abstract should indicate newly observed facts and the conclusions of the experiment or argument ...
Friday, April 4, 2014 at 2:11pm

Persuasive Speech
The primary reason for shelters at bus stops is bad weather. Is your college in an area where there is ... ... LOTS of rain? ... LOTS of snow? ... LOTS of wind? etc ... what else can you think of? If you want factual information to start off with, go to Google and search for ...
Friday, April 4, 2014 at 11:09am

Persuasive Speech
I am doing a speech on why my college should add more bus shelters to the bus stops. So far I have a few points about more students using buses so less pollution and protecting students from the elements, talking about how if they are dressed nice for a career fair or ...
Friday, April 4, 2014 at 11:03am

Algebra 2
1.) According to the American College Test (ACT), results from the 2004 ACT testing found that students had a mean reading score of 21.3 and a standard deviation of 6.0. The scores are normally distributed. A student scores a 35. What percent of the data would contain that ...
Friday, April 4, 2014 at 8:28am

math
As a savings plan for college, when their son Bob was born, the Wilburs deposited $10,000 in an account paying 8% compounded annually. How much will the account be worth when Bob is 18 years old?
Friday, April 4, 2014 at 1:18am

college chemistry
millimols BOH = 25 mL x 0.1M = 2.5 millimols HCl = 5.25 mL x 0.1M = 0.515 ..........BOH + HCl ==> BCl + H2O I.........2.5....0.......0......0 added.........0.515............... C......-0.515..-0.515...+0.515 E...... 1.985....0.......0.515 I would substitute the E line into ...
Thursday, April 3, 2014 at 5:01pm

college chemistry
What would the [H3O+] be after addition of 5.15 mL of 0.1000 M HCl to 25.00 mL of 0.1000 B (a weak base, Kb = 6.31e-5)?
Thursday, April 3, 2014 at 4:46pm

College advance english
To which basic pattern are you referring?
Thursday, April 3, 2014 at 4:42pm

College advance english
how do varieties of informative and positive messages adapt the basic pattern?
Thursday, April 3, 2014 at 3:44pm

Family
What career is more worthy to go to college for and save the most money? A.) Vet Tech B.) Preschool/Kindergarden Teacher C.) Pilot D.) Manager A or B ??
Wednesday, April 2, 2014 at 8:35pm

Reading Skills
This question is based on the following paragraph. (1) After my interview with these four young people, I reflected on the quiet sense of "difference" I sensed with many of these Upward Bound students. (2) As a college teacher who has also taught seventh-grade ...
Wednesday, April 2, 2014 at 5:51pm

Reading Skills
This question is based on the following paragraph. (1) After my interview with these four young people, I reflected on the quiet sense of "difference" I sensed with many of these Upward Bound students. (2) As a college teacher who has also taught seventh-grade ...
Wednesday, April 2, 2014 at 5:30pm

Reading Skills
This question is based on the following paragraph. (1) After my interview with these four young people, I reflected on the quiet sense of "difference" I sensed with many of these Upward Bound students. (2) As a college teacher who has also taught seventh-grade ...
Wednesday, April 2, 2014 at 5:26pm

physics college level
A 2.0-kg block is projected up a frictionless inclined plane with a speed of 10 m/s. The angle of inclination is 30o . The block goes a distance of _____ up the plane before stopping. Assume g = 10 m/s2
Wednesday, April 2, 2014 at 4:27pm

central texas college
Can somebody help please!!!This is the first time that that I take a literature class, on English II in English and I can really use some help. I am taking English 1302, which is pretty much literature and the teacher told us to define some literacy terms, for example: ...
Tuesday, April 1, 2014 at 10:41pm

Math 25 College
Which "same linear equation"? ($22.40 - $12.80)/6 = $1.60/day $1.60 * 30 = $48.00
Tuesday, April 1, 2014 at 2:19pm

college math
1 - .85^5
Tuesday, April 1, 2014 at 12:33pm

college math
The area of a wetland drops by 15 every 9 years. What percent of its total area disappears after 45 years?
Tuesday, April 1, 2014 at 11:10am

college physics 2
A healthy astronaut's heart rate is 60 beats/min. Flight doctors on Earth can monitor an astronaut's vital signs remotely while in flight. How fast would an astronaut be flying away from Earth if the doctor measured her having a heart rate of 28 beats/min?
Monday, March 31, 2014 at 9:48pm

math
As a savings plan for college, when their son Bob was born, the Wilburs deposited $10,000 in an account paying 8% compounded annually. How much will the account be worth when Bob is 18 years old?
Monday, March 31, 2014 at 7:18pm

Math 25 College
Sharlise bought a commuter pass and after riding 3 days to and from scool the pass is worth $22.40. After 6 days of riding to and from school the pass is worth $12.80. Rosa pays $50 for an unlimited rides monthly pass lasting 30 days? Can the monthly cost of these students'...
Monday, March 31, 2014 at 3:34pm

Math
In a survey of 280 college students, it is found that 67 like brussels sprouts, 93 like broccoli, 60 like cauliflower, 26 like both brussels sprouts and broccoli, 21 like both brussels sprouts and cauliflower, 20 like both broccoli and cauliflower, and 10 of the students like ...
Sunday, March 30, 2014 at 9:10pm

college algebra
2 x 10to the what? and 3.5 times ten to the what ?
Sunday, March 30, 2014 at 3:12pm

college algebra
perform the indicated computation. write the answer in scientific notation (2x10^)(3.5x10^)
Sunday, March 30, 2014 at 3:00pm

math
2. In a certain state, it has been shown that only 56% of the high school graduates who are capable of college work actually enroll in colleges.Find the probability that, among the 11 capable high school graduates in this state, each number will enroll in college. c.At least 4...
Sunday, March 30, 2014 at 2:34pm

English
There are many suggestions over college and jobs : " I suggest that you study hard in college, but get a job too. Jobs teach much more than school ever does." ( Workman). ?
Sunday, March 30, 2014 at 2:18pm

English
Embed a quotation from an interview that you conducted. " I suggest that you study hard in college, but get a job too. Jobs teach much more than a school ever does." Workman, Tom. Personal Interview. 25 Feb. 2007.
Sunday, March 30, 2014 at 1:51pm

math
2. In a certain state, it has been shown that only 56% of the high school graduates who are capable of college work actually enroll in colleges.Find the probability that, among the 11 capable high school graduates in this state, each number will enroll in college at least 4
Sunday, March 30, 2014 at 1:33pm

math
Good logic, but I wonder about the .47 in light of P(college) = .56
Sunday, March 30, 2014 at 12:54pm

math
In a certain state, it has been shown that only 56% of the high school graduates who are capable of college work actually enroll in colleges.Find the probability that, among the 11 capable high school graduates in this state, each number will enroll in college. all 11
Sunday, March 30, 2014 at 11:59am

math
I wonder how anyone can measure who is capable of college work? Exactly what is "college work" anyway? From my observation of all these online students enrolled in "colleges", being told they are doing "college work", and getting "degrees&...
Sunday, March 30, 2014 at 10:04am

math
In a certain state, it has been shown that only 56% of the high school graduates who are capable of college work actually enroll in colleges.Find the probability that, among the 11 capable high school graduates in this state, each number will enroll in college. a. Exactly 7 b...
Sunday, March 30, 2014 at 9:32am

college Managerial accounting
dont know
Friday, March 28, 2014 at 6:39pm

College Chemistry (DrBob222)
Excellent job! Thanks a lot
Friday, March 28, 2014 at 12:37pm

College math
f(x)=x^2+7 upward 8 units
Friday, March 28, 2014 at 2:17am

Introduction to Criminal Courts
Analyze and explain the importance of a college degree for someone seeking to join the police or police training. Analyze and explain how higher education plays a pivotal role in advancement and promotions in the police department. Analyze whether higher education is pivotal ...
Thursday, March 27, 2014 at 10:25pm

Calculus
Posted by MG on Wednesday, March 26, 2014 at 6:54pm. The hands of a clock in some tower are 4.5m and 2m in length. How fast is the distance between the tips of the hands changing at 9:00? (Hint: Use the law of cosines) The distance between the tips of the hands is changing at ...
Thursday, March 27, 2014 at 3:36am

College Calculus
Thank you for the response, i tried the method mentioned above three times and was incorrect each time, i double checked all my work to match the method above. The correct answer is always just .3 under the answer All of your arithmetic is right as well, so it is not that. ...
Thursday, March 27, 2014 at 3:31am

College Calculus
let Ø be the angle between them the angular velocity of the minute hand = 2π/60 rad/min = π/30 rad/min the angular velicity of the hour hand = 2π/(12(60)) or π/720 rad/min then, so dØ/dt = (π/30 - π/720) rad/min dØ/dt = 23&#...
Wednesday, March 26, 2014 at 8:25pm

College Calculus
I followed this example, where am i missing something or going about it wrong? If we let y be the angle between the two hands and x be the distance between the two tips, then, by the law of cosines, we have: x^2 = 5^2 + 1.5^2 - 2*5*1.5cos(y) x^2 = 27.5 - 15cos(y) Take the ...
Wednesday, March 26, 2014 at 6:58pm

College Calculus
The hands of a clock in some tower are 4.5m and 2m in length. How fast is the distance between the tips of the hands changing at 9:00? (Hint: Use the law of cosines) The distance between the tips of the hands is changing at a rate of _______ m/hr at 9:00? I tried several times...
Wednesday, March 26, 2014 at 6:54pm

college
Solve the problem. Round to the nearest cent. Joan wants to have $250,000 when she retires in 27 years. How much should she invest annually in her annuity to do this if the interest is 7% compounded annually? A) $1861.10 B) $3356.43 C) $2672.15 D) $937.86
Wednesday, March 26, 2014 at 3:11pm

college physics
A 0.240-kg billiard ball that is moving at 3.00 m/s strikes the bumper of a pool table and bounces straight back at 2.40 m/s (80% of its original speed). The collision lasts 0.0150 s. (a) Calculate the average force exerted on the ball by the bumper. (b) How much kinetic ...
Wednesday, March 26, 2014 at 2:32am

college physics
Competitive divers pull their limbs in and curl up their bodies when they do flips. Just before entering the water, they fully extend their limbs to enter straight down. Explain the effect of both actions on their angular velocities. Also explain the effect on their angular ...
Wednesday, March 26, 2014 at 1:48am

College Chemistry (DrBob222)
Thank you very much!!! Now it makes sense
Tuesday, March 25, 2014 at 6:54pm

College Gen.Chemistry
The straight line of y = 3,256x + 0.007 is the calibration curve of Absorbance on the y axis vs concn on the x axis. So insert 0.545 for y (that's the absorbance) and solve for x (that's the concn). I assume that is concn in grams/250 mL although nowhere is that ...
Tuesday, March 25, 2014 at 6:43pm

College Chemistry (DrBob222)
If I didn't mess up somewhere the pKa = 5.20. Interesting problem. mmols NaOH added = 36.12 x 0.1 = 3.612 ...........HA + NaOH ==> NaA + H2O So at the equivalence point you have 3.612 mmols NaA in solution. Now you add 18.06 mL x 0.1M = 1.806 mmols ..........A^- + H...
Tuesday, March 25, 2014 at 6:28pm

College Chemistry (DrBob222)
A solution of an unknown weak acid, HA, is titrated with 0.100 M NaOH solution. The equivalence point is achieved when 36.12 mL of NaOH have been added. After the equivalence point is reached, 18.06 mL of 0.100 M HCl are added to the solution and the pH at that point is found ...
Tuesday, March 25, 2014 at 5:31pm

College Gen.Chemistry
A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 ± 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a volumetric flask and ...
Tuesday, March 25, 2014 at 5:29pm

College Gen. Chemistry - Science
Dear Dr Bob222, Thank you so much! The answer is 35.5 mL on H2O has evaporated.
Tuesday, March 25, 2014 at 5:22pm

College Chemistry (DrBob222)
See your post below.
Tuesday, March 25, 2014 at 4:56pm

College Gen. Chemistry - Science
So how many mols did you have to start? That's mols = M x L = 0.120 x 0.245 = 0.0294. When some of the water has evaporated you know you still have 0.0294 mols there. And the molarity now is 0.348M and not 0.245M. So M = mols/L. M = 0.348; mols = 0.0294. Solve for L of ...
Tuesday, March 25, 2014 at 4:55pm

College Chemistry (DrBob222)
You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?
Tuesday, March 25, 2014 at 4:52pm

College Gen. Chemistry - Science
You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?
Tuesday, March 25, 2014 at 4:47pm

Literature/Social Studies
"We meet at a college noted for knowledge, in a city noted for progress, in a State noted for strength, and we stand in need of all three, for we meet in an hour of change and challenge, in a decade of hope and fear, in an age of both knowledge and ignorance. The greater ...
Tuesday, March 25, 2014 at 3:39pm

College Chemistry
pH = 3.16 Al(OH)3 + OH^- ==> Al(OH)4-
Monday, March 24, 2014 at 11:00pm

Math-Statistics
The chance that a college student has a job offer before graduation is 70%. If I sample 200 graduates… (use continuity correction) a) what is the chance more than 130 of them have a job offer? b) what is the chance less than 133 of them have a job offer? c) what is the ...
Monday, March 24, 2014 at 7:25pm

business
Ask your college advisor.
Monday, March 24, 2014 at 4:58pm

Social Studies :)
2. The only Native Americans who successfully stayed on their land were the (1 point) Seminole. *** Sauk. Cherokee. Fox. 3. What act did the United States government pass in order to be able to move Native Americans off their land into Indian Territory? (1 point) Native ...
Monday, March 24, 2014 at 4:36pm

college statistics
Twelve different video games showing substance use were observed and the duration times of game play ( in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 95% ...
Monday, March 24, 2014 at 8:33am

college chem 2
The enthalpy of vaporization of liquid diethyl ether is 26.0kJ/mol at 35'C calculate the deltaS' for vapor to liquid
Monday, March 24, 2014 at 3:08am

college chem 2
Calculate the deltaS univ for the dissolving of NaCl at room temp. S' NaCl(s)=72.11 J/k*mol; S' NaCl(aq)=115.5 J/k*mol;deltaH' NaCl(s)=-411.12 kJ/mol; deltaH' NaCl(aq)=-407.27 kJ/mol.
Monday, March 24, 2014 at 3:07am

College Chem
What is the maximum amount of barium sulfate that will dissolve in 600mL of 0.02M Na2SO4? Barium sulfate ksp=1.1*10^-10
Monday, March 24, 2014 at 3:02am

College Chemistry
NaI will ppt. Gases are more soluble at lower temperatures. MOST, but not all, ionic solids are more soluble at higher T.
Monday, March 24, 2014 at 12:29am

College Physics
A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?
Monday, March 24, 2014 at 12:25am

College Physics
The point charges in Figure 17.41 are located at the corners of an equilateral triangle 25.0 cm on a side, where qb = +12.0 µC and qc = -4.50 µC. (Assume that the +x-axis is directed to the right.) (a) Find the electric field at the location of qa. Magnitude ? N/C ...
Monday, March 24, 2014 at 12:18am

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