Friday
October 24, 2014

Posts by john


Total # Posts: 6,305

physics
Two cars collide head on and stick together. The one moving East was going 20.00 m x sec-1 and had a mass of 1500.0 kg. The one heading West was going 25.00 m x sec-1 and had a mass of 1000.0kg. I n which direction were the two cars moving and how fast were they moving?
May 2, 2013

statistics
Linda Silbers is a social scientist studying voter opinion about a city bond proposal for a light rail mass transit system in Denver If Linda wants to be 90 percent Confident that her sample estimate of the proportion of voters who favor the bond is within 2 percent of the ...
May 2, 2013

physics
A projectile was fired out of a lead ejector at an angle of 45 degrees up from horizontal. The projectile velocity was 1000.00 meters per second. How high did it go? and how far did the projectile go?
May 2, 2013

Calculus
Consider the lamina ( with uniform density .01m) having the shape of the region Q in the xy-plane: 1≤x^2+y^2≤4. The density at each point P varies directly with the distance from P to the origin, with density at the point P(2,0,0) being 10kg/m3.Find the polar ...
May 2, 2013

Math-calculus
Evaluate ∫∫ln(x^2+y^2)/sqrt(x^2+y^2) dA where 1≤x^2 +y^2≤e
May 2, 2013

English
Can someone correct these questions, please? Thank you very much in advance. 1) Briefly outline the features of the 18th-century novel focussing on the type of narrator, the hero and the time and place setting. 2) Analyze the structure of Swift's Gulliver's Travels ...
May 1, 2013

Analytic Geometry
What is the equation of a circle passing through (-4,-4) and tangent to the line 2x-3y+9=0 at (-3,1)?
April 30, 2013

accounting 206
asasas
April 29, 2013

Chemistry
What is the pH of a solution prepared by mixing 50.00 mL of 0.10 M NH3 with 25.00 mL of 0.10 M NH4Cl? Assume that the volume of the solutions are additive and that Kb= 1.8 × 10-5 for NH3.
April 29, 2013

business math
One-ninth of Polymer Plastics’ sales are made in New England. If New England sales amount to $600,000, what are the total sales of the company? (Points : 2)
April 28, 2013

physis
A ball of mass 80kg falls from rest from a height of 100m.neglecting air resistance, calculate it K.E after falling a distance of 30cm
April 28, 2013

Physics
The boom weighs 2450 and is attached to a friction less pivot at its lower end. It is not uniform; the distance of its center of gravity from the pivot is 39.0% of its length. What is the tension in the guy wire? Link to picture of problem which is needed to solve the problem...
April 28, 2013

Physics
The boom weighs 2450 and is attached to a friction less pivot at its lower end. It is not uniform; the distance of its center of gravity from the pivot is 39.0 of its length. What is the tension in the guy wire? Link to picture of problem which is needed to solve the problem...
April 27, 2013

Physics
Add com after tinypic
April 27, 2013

Physics
The boom weighs 2450 and is attached to a friction less pivot at its lower end. It is not uniform; the distance of its center of gravity from the pivot is 39.0 of its length. Picture Link: tinypic./view.php?pic=53qp3m&s=5 What is the tension in the guy wire?
April 27, 2013

Chemistry
Calculate the percent ionization of 0.140 M lactic acid in a solution containing 8.5×10−3 M sodium lactate.
April 27, 2013

economics
hi new to economics, and struggling with some of its concepts. got this posed as a homework question, and i have to admit stumped as how to begin. Suppose a firm finds that the marginal product of capital is 60 and the marginal product of labor is 20. If the price of capital ...
April 26, 2013

Physics
I need the formulas for Q5 , Q6 and Q7
April 26, 2013

Math
Math Problem: Find the area of a circle that has a radius of 14 feet. Round your answer to the nearest hundredth. Would someone please check the way I worked this and let me know if I did it correct or not? Thank You A=3.14 (14ft)2 A=3.14 (196) A=615.44 Im thinking I didn'...
April 26, 2013

statistics
out of ten questions two students got 8 wrong find out probability if they are cheating
April 25, 2013

Math
How do you find the length of the base of a triangle? My math problem is: The area of a triangle is 33.6 inches. If the height is 4 inches what is the length of the base? thank you
April 25, 2013

A.P. Chemistry
Thorium-232 undergoes alpha decay and has a half-life of 1.4 * 10^10 years. How long will it take for a 1.00mg sample of thorium-232 to be reduced to 0.5mg?
April 25, 2013

chemistry
A 33.0g sample of nitrogen, N2 has a volume of 42.0L and a pressure of 640.mmHg. What is the temperature, in kelvins and degrees Celsius, of the gas?
April 24, 2013

Public Speaking
when speaking about abstracts concepts, make them concrete to the audience by?
April 24, 2013

physics
A standard man climbs 10 m up a vertical rope. How much energy in calories is dissipated as heat in a single climb if 20% of the total energy required is used to do the work?
April 24, 2013

Math
Compare the areas of two rectangular regions if the length of one rectangular region is double that of the other, and the width is triple that of the other. (Use an algebraic formula.)
April 24, 2013

Biology
you are studying a single-gene locus with two alleles in a population that is in Hardy-Weinberg equilibrium. Examination of a large sample of individuals from the population reveals there are six times as many heterozygotes as there are homozygote recessive individuals in this...
April 23, 2013

biology
In a natural population of outbreeding plants, the variance of the total number of seeds per plant is 16. From the natural population, 20 plants are taken into the laboratory and developed into separate true-breeding lines by self-fertilization—with selection for high, ...
April 23, 2013

maths
the frst term of AP is 4 and the last term is 79.given that the sum of the AP is 996, find the number of terms and the commmon difference.
April 23, 2013

Health
What physical changes do individuals encounter at the first stage of stress (alarm)?
April 22, 2013

Health
Can you please Analyze the health impacts of the second stage of stress (Resistance?
April 22, 2013

english
write your points for or against the motin which states that 'excessive self confidence is indisputably a boon and not a bone .750 words
April 22, 2013

maths
In an AP the first term is 2 and the nth term is 29 and the sum of the n term is 155 find n
April 22, 2013

physics
suppose that there are 1.9*10^25 stars in the universe. how many moles of stars would this be?
April 22, 2013

physics 70
d) F = ma (in the 'y' direction) *ball at bottom mean 'T' is upward and 'mg' is downward* T - mg = ma T - mg = m(v^2/r) (r(T - mg))/m = v^2 v = sqrt((r(T - mg))/m) v = sqrt((.85(22.5 - (.275*9.8))/.275) v = 7.82 m/s
April 21, 2013

physics 70
c) F = ma (in the 'y' direction) *ball at top means 'T' and 'mg' are pointing "downward"* -T -mg = ma -T = mg + ma T = -mg -ma T = -m(g + v^2/r) T = -.275(9.8 + (5.20^2/.85)) T = -11.4 N, or, 11.4 N downward
April 21, 2013

Chemistry
Assume you dissolve 0.235 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 4.00*10^2 mL of solution and then titrate the solution with 0.138 M NaOH. C6H5CO2H(aq) + OH-(aq) C6H5CO2-(aq) + H2O(l) Find concentration of Na+ at equivalence point.
April 21, 2013

Chemistry
Calculate the H3O+ ion concentration and the pH at the equivalence point when 45.0 mL of 0.4000 M NH3 is mixed with 45.0 mL of 0.4000 M HCl. Ka=5.6x10-10
April 21, 2013

Chemistry
Calculate the H3O+ ion concentration and the pH at the equivalence point when 45.0 mL of 0.4000 M NH3 is mixed with 45.0 mL of 0.4000 M HCl. Ka=5.6x10-10
April 21, 2013

Physics
1. Ohm's Law states that for some circuits the voltage is proportional to the current. In other words, if you double the voltage, you will double the current. Which of these equations agrees with this statement of Ohm's Law? (∝ means "is proportional to"...
April 18, 2013

Statistics
The design tolerance thickness for an automotive part is 55mm to 65mm. If the process mean thickness is 61mm with a standard deviation of 2.3mm, then what percentage of the sheets will be acceptable?(What percentage will fall within the design tolerence?) Assume that the ...
April 18, 2013

News opinion a
- The driver of an Okaloosa County EMS ambulance passed out before he caused a five-vehicle crash at Mary Esther Cut-Off and Wright Parkway on Tuesday evening, according to police. David M. Keller, 40, of Baker, was talking with his partner as he drove the ambulance south on ...
April 18, 2013

finance
. Fargo Industries has outstanding 30 year bonds at 7% semiannual payments. The bond sells at 90% of its face value. If their tax rate is 22%: a.What is the aftertax cost of debt? b. What is the pretax cost of debt? c. Which is more important in calculating the cost of capital...
April 17, 2013

science
If 1.38 g of steam at 100.0°C condenses into 38.6 g of water, initially at 27.6°C, in an insulated container, what is the final temperature of the entire water sample? Assume no loss of heat into the surroundings. °C
April 16, 2013

statistic
A sample of 59 night-school students' ages is obtained in order to estimate the mean age of night-school students. x = 25 years. The population variance is 19. (a) Give a point estimate for μ. (Give your answer correct to one decimal place.)
April 16, 2013

Help with statistics
how u came up with 2.61 and 1.54
April 16, 2013

english
With in sentence should town also be capitalized? The town of Blair, Nebraska, is home to Dana College.
April 16, 2013

English
Can someone check these questions, please? Thank you in advance In Shelley's Frankenstein, what are the traits that remind us of a Gothic novel? 2)Discuss the concepts of beauty and youth as portrayed by Lord Henry in chapter 2 of O. Wilde's The Picture of Dorian Gray...
April 15, 2013

Livingston High
61/3 =
April 15, 2013

Math
The mean time to complete a certain stat quiz is 25 minutes, with a standard deviation of 5 minutes. Find the probability of a student taking. 1.) less than 15 minutes. 2.) Between 15 and 25 minutes. 3.)more than 25 minutes.
April 14, 2013

English
3. Talk with your partner and check the Yes box if your partner likes the activity. If your partner doesn't like the activity, check the no box. ("likies") -> likes. other than that it is grammatically correct.
April 14, 2013

Histroy
Once they arrived in the United States, immigrants experienced a life very different from what they imagined. Which was not something that was most immediately part of their experience? (Points : 1) Labor scams Low skilled work Religious tolerance Assimilation
April 14, 2013

Physics multiple choice
3. What are the units for Coeffecient of Lift? [kgm^-3] No units [Ns] [N^2] [N] [ms^-1] [kg] 4. What are the units for the ratio Lift to Drag? [Ns] [kgm^-3] No units [ms^-1] [kg] [N^2] [N]
April 12, 2013

Geometry
A set of three distinct positive integers has mean 4 and median 5. What is the largest number in the set?
April 11, 2013

Geometry
I saw the the problem already answered but I just don't get what is a and what is b.
April 11, 2013

Geometry
Two players each flip a fair coin. The probability that they get the same result can be expressed as a b where a and b are coprime positive integers. What is the value of a+b ?
April 11, 2013

English
Thank you! I left out these sentences on Owen's life. Thank you. 1) Wilfred Owen enlisted as a soldier in 1915. During his first mission in France, he spent some time in hospital to recover from shell shock. 2) There, he met poet Siefried Sassoon who read his poems and ...
April 10, 2013

English
Can somone check if my sentences on Owen's poem "Dulce and Decorum est" are correct? Thank you very much The title of his 1917 poem Dulce et Decorum Est translates to “It is sweet and right” – a direct quotation from Ode, written by Latin poet ...
April 10, 2013

Statistics
In his management information systems textbook,Professor David Kroenke raises and interesting point:"If 98% of our market has Internet access,do we have a responsibility to provide non-Internet materials to that other 2%?Suppose that 98% of the customers in your market ...
April 9, 2013

Physics
Platform area = 0.027[m2]. Wind Speed = 7.1[ms-1]. Air Density = 1[kg m-3]. Drag = 0.39[N]. Lift = 1.45[N]. Coeffecient of Lift = Use three sig. figs. or N/A if no answer. Platform area = 0.045[m2]. Wind Speed = 5.7[ms-1]. Air Density = 1[kg m-3]. Drag = 0.77[N]. Lift = 1.19[...
April 7, 2013

math
A rectangular garden is 20 m by 25m. It is surrounded by a sidewalk. The outside perimeter of the sidewalk is 114m. What is the width of the sidewalk?
April 7, 2013

English
I want to learn how to write an appropriate letter to the editor in no more than 200 words. I took the article "stuck in the middle" by Jeevan Vasagar of "The Guardian" as an exercise, you can find it on Google. Unfortunately, I am not allowed to post ...
April 7, 2013

Physics
A 35kg child is swinging on a swing with length 2.8m to the bottom of the seat. At the highest point of the swing, the rope makes an angle of 42 degrees from vertical. Calculate the speed of the child at the bottom of the swing. Assume no thermal energy is created. Calculate ...
April 5, 2013

Physics
A bat flying in a cave emits a sound and receives its echo 0.1 s later. Show that it's distance from the cave wall is 19 m.
April 4, 2013

English
Thank you
April 4, 2013

English
I don't understand the question please explain
April 4, 2013

English
Pretend you are a modern social worker, educator, environmentalist, or military advisor to the president. Attack an evil you see the work by writing an ironic proposal and the proposal have to be outrageous
April 4, 2013

statistics
An educational researcher studying the ages of freshmen at community colleges took a sample of 12 students. The data below represent the ages of the students sampled
April 3, 2013

Statstistics
Chicken Delight claims that 91% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 90 orders revealed that 75 were delivered within the promised time. At the 0.10 significance level, can we conclude that less than 91% of the orders are ...
April 3, 2013

government
Thank you.
April 2, 2013

government
So it is B I get it.
April 2, 2013

government
Is it A? Ms. Sue
April 2, 2013

government
A.
April 2, 2013

government
I think C
April 2, 2013

government
what is the implied power expressed by the necessary and proper clause in the constitution a congress's ability to make laws is severely limited by the Constitution b congress is given limited authority to interpret reserved powers c congress must follow a concrete ...
April 2, 2013

math
Bank A interest per years = (2.46*30000)/100= $738 per year Bank B interest (2.48*30000)/100=744 Bank c interest (2.47*30000)/100=741 So Bank B the most interest at the end of one year.
April 2, 2013

Chemistry
You have .8 liters of a 0.5M HCl solution. If you use this solution to complete a decomposition reaction of HCl how many moles of hydrogen (H2) would be produced?
April 2, 2013

government
congress shares power with the president in the field of foreign affairs. what other powers do congress and the president share? a judicial powers b postal powers c territorial powers d war powers
April 2, 2013

government
which of the following determines who holds the position of speaker of the house? a the president b the house c the senate d the joint houses of congress
April 2, 2013

government
which of the following determines who holds the position of speaker of the house?
April 2, 2013

English
Can someone check these sentences I need to prepare for tomorrow? Thank you. 1) Troy has been at the BRIT School since he was 14. Before that he was in a normal secondary school. 2) Unlike in a normal secondary school, students at the BRIT study all the ordinary academic ...
April 2, 2013

Physics
94860m
April 2, 2013

biology
) To test linkage between the feather texture and feather color genes you complete a test cross with the F1, and find that the feather texture and feather color genes are linked. Only part of the data from the test cross is given below. Complete the table by giving the four ...
April 2, 2013

Algebra help!!
help please!! 1. There is an E like symbol that has a 7 at the top. On the bottom k=1 and on the right side (-1)^k K 2. There is an E like symbol that has a 8 at the top. ON the bottom K=3 and on the right side (-1)K/K(k-2)
April 1, 2013

math: Algebra
Three cylindrical tubes with with a 12 in diameter are strapped together by a plastic band. How long is the band?Suppose that four of the same tubes are strapped together with a snugly fitting plastic band how long is the band?
April 1, 2013

Algebra
I have two problems that I need some help with. I believe I got to the answer but not quite sure if its right. I need to expand and evaluate each series. 1. There is an E like symbol that has a 7 at the top. On the bottom k=1 and on the right side (-1)^k K 2. There is an E ...
April 1, 2013

Algebra help
I need some help I posted the first question to this a bit ago but didnt enter it correctly so sorry to those who helped! I also have a 2nd half which I understood till they added the dividing part. I need to find the first five terms of each recursive sequence. 1.C1=64, C2=32...
April 1, 2013

biology
Consider the pedigree below. Individual 1 is homozygous normal. Individual 2 is both red-green color blind and a hemophiliac. Individual 6 is the as yet unborn son of 4 and 5. What is the probability that their son, 6, will be both color blind and a hemophiliac? Express your ...
March 31, 2013

Chemistry
What are the concentrations of A– and HA after 24 mL of 0.33 M hydrochloric acid solution is added to 86 mL of a solution that has [A– ]=0.67 M? Do NOT consider any equilibrium reactions in this problem. A–(aq) + HCl(aq) → HA(aq) + Cl–(aq) How do I ...
March 31, 2013

Physics
A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.1 kg and the sign has a mass of ms = 16.4 kg. The length of the beam is L = 2.83 m. The sign is attached at the very end of the beam, but the horizontal wire holding up the beam is attached...
March 31, 2013

Biochemistry
in need of part b like frustration
March 31, 2013

cHEMISTY
If Ksp for the dissolution of silver carbonate is 8.1x10-12, calculate the concentration of silver ions present in a saturated solution of silver carbonate
March 30, 2013

Math Movers
Thanks!
March 29, 2013

Math Movers
I meant C=500+10(M-100)
March 29, 2013

Math Movers
Wouldn't it be this? C=500+10M-100)
March 29, 2013

Math Movers
Movers A mover charges $500 for the first 100 miles plus $10 for each additional mile. If C represents the charge and M represents miles. What would the equation look like for this question?
March 29, 2013

Chemistry
Titration of 0.6500g of an acid requires 182.42 mL of 6.020x10^-3 N NaOH to reach the endpoint. What is the mass of an equivalent of this acid?
March 28, 2013

Algebra
What is the product of all roots to the equation \begin{align} & (x-1)(x-2)(x-3) + (x-2)(x-3)(x-4) \\ + & (x-3)(x-4)(x-5) + (x-4)(x-5)(x-6) \\ + & (x-5)(x-6)(x-7) + (x-6)(x-7)(x-8) =0 ? \end{align}
March 27, 2013

Algebra
\begin{align} & (x-1)(x-2)(x-3) + (x-2)(x-3)(x-4) \\ + & (x-3)(x-4)(x-5) + (x-4)(x-5)(x-6) \\ + & (x-5)(x-6)(x-7) + (x-6)(x-7)(x-8) =0 ? \end{align}
March 27, 2013

Algebra
As x ranges over all real values, what is the minimum value of f(x)=|x-123|+|x-456| + |x-789| ?
March 27, 2013

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