Friday
May 29, 2015

Posts by John


Total # Posts: 6,708

physics
If a rubber tire having a weight of 18.0lbs requires a force of 38.0N to keep it in uniform motion on a level highway find the coefficient of kinetic friction.
February 10, 2015

math
The angle which the tangent to the curve at the point (2, 5) makes with the horizontal
February 10, 2015

math
Integrated Math 1. The Overland Trail: Traveling at a constant Rate. Who will make it? Need help graphing 3 sets of data on one graph?
February 9, 2015

economic theory
assume that a business firm produces two commod ities, X and Y, with two different inpu ts, Labour (L) and Capital (K). The total quantities of L and K available per un it of time are specified as L = 1600 labour hours; and K = 20 00 units. In addition, assume that producing 1...
February 9, 2015

math
The radius of circle is given as 2.8 cm to 2 significant figure (a) If C is the circumference of the circle, determine the limits between which C/π lies. (b) By taking π be 3.14; find to 4 significant figures the line between which the circumference lies
February 9, 2015

math
trying to help the kid with hw but not smart enough. please help. Thank You! -(5/7) ^ -2/5 can be written as -(a)^b where "a" is a positive rational number that is greater than 1 and "b" is a positive rational number that is less than 1. Find 'a' ...
February 8, 2015

math
Samuel bought three cups and four spoons for Kshs 324. Daniel bought five cups and Mary bought two sppons of the same type as those bought by Samuel. Daniel paid Kshs 228 more than Mary. Find the price of each cup and spoon.
February 8, 2015

math
There are two sign posts A and B on the edge of the road. A is 400 m to the west of b. A tree is on a bearing of 60 degree from A and a bearing of 330 degree from B Calculate the shortest distance of the tree from the edge of the road.
February 7, 2015

math
There are two sign posts A and B on the edge of the road. A is 400 m to the west of b. A tree is on a bearing of 60 degree from A and a bearing of 330 degree from B Calculate the shortest distance of the tree from the edge of the road.
February 7, 2015

chemistry
0.000839
February 5, 2015

math
Mary bought and beans from a wholesaler. She then mixed the maize and beans ratio 4:3, she bought the maize as $12 per kg and the beans $4 per kg. if she was to make a profit of 30 %. What should be the selling of price 1 kg of the mixture?
February 5, 2015

math
The cash prize of a television is shillings 25000. A customer paid deposits Shillings 3750. She repaid the amount owing in 24 equal monthly installments. If she was charged simple interest at the rate of 40% p.a, how much was each installment
February 5, 2015

math
16 2/3% or 16.67%
February 5, 2015

math
Mary bought and beans from a wholesaler. She then mixed the maize and beans ratio 4:3 she bought the maize as $12 per kg and the beans $4 per kg. if she was to make a profit of 30 %. What should be the selling of price 1 kg of the mixture?
February 5, 2015

math
Thanks Ms.Sue.. That's what I got when I divided it. So the 50 T-shirts is the better deal.
February 5, 2015

math
one company makes 50 t-shirts for $295 and another offers 40 t-shirts for $250. which company is the better deal? answer please
February 5, 2015

Finance
Determine the annual net cost of these checking accounts: a. Monthly fee $4, check-processing fee of 20 cents, average of 23 checks written per month
February 5, 2015

Finance
Your parents are retired and have expressed concern about the really low interest rates they’re earning on their savings. They’ve been approached by an advisor who says he has a “sure-fire” way to get them higher returns. What would you tell your parents ...
February 5, 2015

math
Spencer Morris works in the telemarketing division for a company that pays a salary of $735 per month plus a commission of 31 2% of all sales greater than $15,500. If he sold $45,900 last month, what was his total gross pay?
February 3, 2015

AP Chemistry
Same. I'm still stuck on this question. Did you get the answer?
January 31, 2015

Chemistry
Are you taking AP Chemistry online? I'm taking it too! Some questions are hard and there are no answers for it on the internet. :( Which unit are you doing right now?
January 31, 2015

Math
A cubic foot of water weighs 62.4 lb. A basketball has a radius of 0.39 ft. How much would the basketball weigh if it was filled with water I did 4 times pie times 0.39^3 over 3 and get 0.24834888, I just need to know what to do now ^= power symbol
January 30, 2015

calculus
(cx)={X if 0 is less than or equal x less than or equal 10 and 0.9x if 10<x
January 29, 2015

Phsyics
A skier is gliding along at 2.5m/s on horizontal, frictionless snow. He suddenly starts down a 10∘ incline. His speed at the bottom is 13m/s . What is the length of the incline? How long does it take him to reach the bottom?
January 29, 2015

Chemistry
Since chlorine has similar electronegativity as nitrogen, why can't chlorine form hydrogen bonds?
January 28, 2015

math
27=-2y+15
January 28, 2015

science gases
fart
January 27, 2015

Physics
What is the maximum height above ground a projectile of mass 0.67 kg, launched from ground level, can achieve if you are able to give it an initial speed of 78.5 m/s?
January 27, 2015

ALGEBRA
2/3
January 25, 2015

physics
Cock
January 25, 2015

College Physics
An electron in a television tube travels the 12 cm distance from the grid to the screen at an average speed of 7.00 107m/s. How long does the trip take?
January 24, 2015

Economics
How can a trade deficit actually increase the productivity of an economy? 1. by causing people to save 2. by building up a large amount owed 3. by importing funds used for capital deepening 4. by importing goods for short–term use I think 1, can anyone verify?
January 23, 2015

algebra
Let X be a number. Translate the English phrase or sentence into a mathematical expression. Then evaluate the expression for X =8. The expression is ?
January 22, 2015

statistics
As part of a data base on new births at a hospital some variables recorded are the age of the mother, marital status of the mother (single, married, divorced), weight of the baby, and gender of the baby. Of these variables A. age, marital status, and weight are quantitative ...
January 21, 2015

math
Solve, using linear combination. 5x + y = 2 4x + y = 4 Write your answer as an ordered pair or write "no solution" or "infinitely many solutions".
January 21, 2015

economics
1. A sudden escalation in medical costs for treatment of ischemic heart disease would immediately: Answer Benefit providers. Be passed on to consumers. Benefit insurance companies. Decrease insurance company profits in the short term. Decrease tax revenues to the federal ...
January 17, 2015

Physics
A boy is trapped in a large area of very soft mud. A man rescues the boy by crawling across a long, light board rather than by walking into the mud. What effect, if any does the board have on the force and the pressure on the mud, compared with walking? A. force and pressure ...
January 15, 2015

Physics
Chisel is a pivot point between the wire and a 2 cm distance between the pins and the hand is 10 cm F 50 Newton force How much is the mechanical advantage? How much is the forces acting on the wire?
January 15, 2015

Chemistry
A gas occupies 30 0dm3 at stp what volume would it occupy at 91 and 380mm hg?
January 14, 2015

Science
In the past, what makes someone or a group of people considered to be "unfit" members of society?
January 13, 2015

Math
Never mind I eventually found out how to solve it myself.
January 13, 2015

Math
Given f(x)=-2-3x-x^2 , find f(1+k)
January 13, 2015

Science
What features of Western culture help lead people to believe in their primacy over nature?
January 11, 2015

Algebra 2
Adults 5.00 Kids 3:50 240 tickets sold for 1140 How many adults? How many kids?
January 11, 2015

PreCalc
Thank you sooo much! But how can I solve the 5th degree one algebraically?
January 10, 2015

PreCalc
Can you guys also help me on this one? x^5 + 4x^4 -16x -16 < 0
January 10, 2015

PreCalc
Solve each inequality: (1/(2b+1)) + (1/(b+1)) > (8/15) (2/(x+1)) < 1 - (1/(x-1)) My teacher told me the answer is in interval notation, and that a number line is used to solve.
January 10, 2015

Math
(8.86 + 1.0 * 10^-3) / (3.610 * 10^-3) Calculate the above formula, expressing the answer in scientific notation with the correct number of significant figures: 8.86 + 1.0 * 10^-3 = 8.86 + 0.0010 = 8.8610 = 8.86. 8.86/(3.610 * 10^-3) = 2454 2.454 * 10^3 Please confirm if I did...
January 9, 2015

quantitative methods
a packing device is set to fill detergent powder packet with a mean weight of 5 kg . The standard deviation is known to be 0.01 kg. these are known to drift upwards over a period of time due to machine fault, which is not tolerable. A random sample of 100 packets is taken and ...
January 9, 2015

English
What belief does Whitman share with Ralph Waldo Emerson and other transcendentalists? A) We should live our lives well to achieve everlasting happiness. B) Man learns his most important lessons and insights in the present, through direct experience. If I recall correctly ...
January 8, 2015

physics
P.S. I forgot to multiply by the .5 in the second to last step . It should read : d = 696 + .5 * 1140 m d = 1266 m
January 8, 2015

physics
d = V0 * t + 1/2 a t ** 2 where average acceleration a = (V1 - V0) / dt V0 = 58 m/s V1 = 153 m/s dt = 12 s a = (153-58)/12 m/(s*s) a = 7.9 m/(s*s) d = 58 * 12 m/s *s + .5 * 7.9 * (12 * 12) m/(s*s) * (s*s) d = 696 + 1140 m d = 1836 m
January 8, 2015

Physics and Math
P.S. forgot to take square root in time calculation. Should be t = .0007s so v = 100 - 40000 * .0007 * .0007 v = 100 - .02 v = 99.98 m /s
January 8, 2015

Physics and Math
v = V0 + a * t F = m * a s = .5 * a * t^2 where s = 0.01 m V0 = 100 m / s m = 0.5 kg F = 2000 kg m/(s^2) solving f=ma for a : a = f/m = -2000/0.05 m/(s^2) = -40000 m/(s^2) solving s = .5at^2 for t : 2s = at^2 2s/a = t^2 t = square root(2s/a) t=square root (2 * 0.01m) / -40000 ...
January 8, 2015

physics
v = V0 + a * t V0 = 0 a = 2.75 m/s^2 t = 3.00 s v = 0 + 2.75 * 3.00 m/s v = 8.25 m/s
January 8, 2015

Science/earth
How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.
January 6, 2015

Pre-Calc
Yeah sorry, my bad. I must have plugged in the numbers wrong, since I just got 44.5 for my answer. You guys are right, Thanks so much Steve and Reiny for your help!
January 4, 2015

Pre-Calc
Sorry, I'll be more clear. The question already stated how high the ferris wheel is at t=8 seconds. The highest point the ferris wheel reaches is 63 feet and the time for that is 8 seconds. What I'm trying to find out is how high the ferris wheel is when t=5 seconds ...
January 4, 2015

Pre-Calc
when i plug in t=5, I get 62.99 feet, but isn't that the height when t=8 seconds?
January 4, 2015

Pre-Calc
A ferris wheel is 63 feet tall when it reaches its highest point at 8 seconds. At the bottom of the ride, you are 3 feet off the ground. So how high off the ground will you be 5 seconds after the ride starts? Write a function f so that f(t) will equal how high in feet you will...
January 4, 2015

Algebra 1
x^4-9x^3-7x^2-8x+2 Divide by x^2+x+1 Thanks
January 4, 2015

Algebra 1
6x^3-3x^2+x-40 Divided by x-2
January 4, 2015

Algebra
The length of a rectangle is 8 ft less than three times the width, and the area of the rectangle is 35 ft2 . Find the dimensions of the rectangle.
January 2, 2015

science
How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.
December 29, 2014

Algebra
An acre of land is chosen at random from each of the three states listed in the table at the right. What is the probability that all three acres will be farmland? 1. Does the choice of an acre from one state affect the choice from the other states? 2. How must you rewrite the ...
December 28, 2014

Algebra
An acre of land is chosen at random from each of the three states listed in the table at the right. What is the probability that all three acres will be farmland? 1. Does the choice of an acre from one state affect the choice from the other states? 2. How must you rewrite the ...
December 28, 2014

math
a boy has 380 prize tickets he wants to exchange for action figures at a prize booth,the prize both tickets 5 tickets can be exchanged for a large figure and 7 tickets for 2 small figures the boy wants 4 times as many small action figures as large can the boy get 80 small ...
December 28, 2014

Algebra
Thank you.
December 23, 2014

Algebra
Thank you for your quick reply. Can you please share the work ? Guess work in math could land up in wrong spot.
December 23, 2014

Algebra
r^3-24r-5 / r-5 How to divide r^3-24r-5 / r-5 quickly with less steps ? Thanks
December 23, 2014

Calculus
If 3x^2+y^2=7 evaluate ((d^2)y)/(dx^2) when x=1 and y=2
December 21, 2014

calculus
use implicit differentiation to find y=(x+8)^(3x)
December 21, 2014

Chem
Sorry I wasn't clear. That was the answer I got. I think my sig figs wrong cause I don't see any with three.
December 17, 2014

Chem
I set it up just like that and got kelvins right but still got it wrong 301.15k for T1 258.15k for T2 Answer was 0.887
December 17, 2014

Chem
A pressurized can of whipping cream has an internal pressure of 1.035 atm at 28°C. If it is placed in a freezer at -15°C, what is the new value for its internal pressure?in atm
December 17, 2014

calculus
No idea where to start The cost in dollars of producing x units of a particular camera is C(x) = x2 - 10000. (10 points) Find the average rate of change of C with respect to x when the production level is changed from x = 100 to x = 101. Include units in your answer. Find the ...
December 16, 2014

calculus
so would the velocity be -29.4?
December 16, 2014

calculus
supposed to be a 4.9t^2+550
December 16, 2014

calculus
Do I just put in 3 for t? A ball is dropped from a tower 550 meters above the ground with position function s(t) = 4.9t2 + 550. What is the velocity of the ball after 3 seconds?
December 16, 2014

Calculas
Do I just put in 3 for t? A ball is dropped from a tower 550 meters above the ground with position function s(t) = 4.9t^2 + 550. What is the velocity of the ball after 3 seconds?
December 16, 2014

Physics
A projectile is shot vertically upward with a given initial velocity. It reaches a maximum height of 100 m. If, on a second shot, the initial velocity is doubled then the projectile will reach a maximum height of ____________?
December 13, 2014

English
Which diagram correctly represents this sentence? Andy teaches and plays the guitar
December 13, 2014

PHYSICS
X = Vo*t+ 1/2*a*t^2 solve for x
December 11, 2014

English
How does voice affect the credibility of a text?
December 11, 2014

physics
A train moving at a constant speed is passing a stationary observer on a platform. a flute player is playing a note with frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The speed of sound in air ...
December 9, 2014

physics
A train moving at a constant speed is passing a stationary observer on a platform. a flute player is playing a note with frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The speed of sound in air ...
December 9, 2014

Chemistry
How many liters of stomach acid (pH = 4.000) will be neutralized by a 1.50 g tablet of "Bicar", a commercial tablet which is 50% flavored and 50% NaHCO3? Note that: NaHCO3(s) --> Na+(aq) + HCO3-(aq) and: H+(aq) + HCO3-(aq) --> H20(l) + CO2(g) So far I've ...
December 9, 2014

Math (Simplifying Fraction)
(x^-1+4x^-2)/(1-16x^-2)
December 8, 2014

mechanics
what is coefficient of friction of a 25lb object resting on a horizontal surface that requires 10lbs to move?
December 8, 2014

Chemistry; stoichiometry
Thanks for the advice! I was still getting an odd theoretical yield but that was probably from the data we collected.
December 7, 2014

Chemistry; stoichiometry
Determine the theoretical yield of silver that is produced if the other product is Copper(II) Nitrate. Copper that reacted: 0.3180 This is what I had: 0.3180g Cu x 1mol Cu/63.5g Cu x 2mol Ag/1mol Cu x 107.87g Ag/1mol Ag = 1.079g Ag (Set up in factor label method)
December 7, 2014

Advance Algebra
thanks:) mapuan here:)
December 7, 2014

m
yes, of course! there is no problem to each the kids science everyday! science is a very exciting thing!
December 6, 2014

physics
what impulse is needed to slow a 45kg object from 15m/s to 12m/s?
December 6, 2014

physics
steven throws a 3.5kg ball at a speed of 25m/s. what is the momentum of the ball? Please show work
December 6, 2014

physics
how many significant digits are in the following measurement 2.546m
December 5, 2014

algebra
how do you write the simplest polynomial function with the given zeros
December 4, 2014

algebra
how do you write simples polynomial function with the given zero 1-i and 2
December 4, 2014

Chemical Biology
Which fruits or vegetables or plants do not contain catalase enzyme?
December 4, 2014

algebra
how to you solve polynomial equation by factoring x^3 + 3x^2 - 9x = 27
December 3, 2014

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