Friday
May 22, 2015

Posts by john


Total # Posts: 6,657

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

algebra
solve polynomial equation by factoring x^4 +100 = 29x^2
December 3, 2014

Language Art Novel
ms. sue are you a stripper?
December 3, 2014

algebra
solve polynomial equation by factoring 2x^3 - 12x^2 = 32x - 192
December 3, 2014

algebra
how do you solve polynomial equation by factoring 3x^4 + 11x^3 = 4x^2
December 2, 2014

physics
how do you solve 3x^4 + 11x^3=4x^2
December 2, 2014

Chemistry
carbon dioxide has a henrys law constant of 3.4E-2 mol/l*atm what is the molar concentration of CO2 in water if the partial pressure of CO2 in air is .000387. i know i have to use S=Kh*P but that gives you soluability where do i go from here to find molar concentration of CO2 ...
December 2, 2014

math
need help please. the time required for one complete oscillation of a pendulum is called its period. if L is the length of the pendulum, then the period is given by P= 2 times pie multiplied by the square root of (L/g), where g is a constant called the acceleration due to ...
December 2, 2014

algebra
using long division (x^6 - 4x^5 -7x^3) / (2x^3)
December 1, 2014

physics
a 2.0-kg ball has a momentum of 25 kg*m/s. what is the ball's speed?
December 1, 2014

physics
a net force of 200 newton's is applied to a wagon for 3 seconds. this causes the wagon to undergo a change in momentum of
December 1, 2014

physics
a net force of 100 newton's is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of
December 1, 2014

Math 3371
In a certain year, 26% of all teenagers in the United States had checking accounts. Your bank, TeenChex Inc., is interested in targeting teenagers who do not already have a checking account. (a) If TeenChex selects a random sample of 3,000 teenagers, what number of teenagers ...
November 24, 2014

Business statistics
Hello, I'm struggling trying to find the answer for b. Do you know the answer and help would greatly be appreciated! A clean air standard required that vehicle exhaust emissions not exceed specified limits for various pollutants. Many states require that cars be tested ...
November 20, 2014

science
The question is in reference to o2 canisters attached to space suites during space travel
November 19, 2014

science
What provides pure O2 for inhaling and canisters to collect CO2 CO2.
November 19, 2014

Chemistry
Are there any substances that are soapy and/or bitter in nature but are not bases/alkali?
November 18, 2014

Chemistry
Neutralizing acids.
November 16, 2014

Chemistry
Are there any chemical reactions or observations that involve sodium hydroxide or any other bases, but cannot be used to confirm its basic nature?
November 16, 2014

calculus
it costs 8 dollars to manufacture and distribute a backpack.If the backpack sell at x dollar each, the number sold , n, is given by n= 3/(x-8)+5(100-x) . Find the selling price that will maximize the profit.
November 15, 2014

safety contest scramble
Four words. First word (8 letters), second (6 letters) third (four letters) fourth word (9 letters). The letters are oneqplmeiuoraeectttnepsrivp. Any ideas?
November 13, 2014

Physics
A 5.00-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.650. What is the maximum horizontal force that can be applied before the 5.00-kg block begins to slip relative to the 12.0-kg ...
November 10, 2014

Physics
Two masses ( 2.3 kg and 4.2 kg) connected by a massless rope hung over opposite ends of a frictionless pulley. Each mass is initially 1.50 m above the ground, and the top of the pulley is 6.5 m above the ground. What maximum height does the lighter object reach after the ...
November 9, 2014

SCIENCE
Hello
November 9, 2014

Algebra
A kayaker paddles upstream for 1.5 hours then turns his kayak around and returns to his tent in 1 hour. He travels 3 miles each way. What is the rate of the rivers current?
November 8, 2014

Chemistry
How many hydrogen bonds can each (i) water and (ii) ice molecule form?
November 8, 2014

calculus
find the derivative of y y= 2 (22x+31)^(3/2)+ arctan((22x+21)^(1/2))+ln(11x+16)-22x-30
November 8, 2014

Calculus
i didn't get what you did can you plzz help me again ?
November 8, 2014

Preschool/Kindergarten
I agree with Ms. Sue. d is the best choice.
November 7, 2014

science help!!!!!!!!!
you stupid !@#$%^& it was D you should get fired
November 7, 2014

Chemistry
Does the Hydrogen Bondings in ice form, break, and reform all the time, just like in water?
November 7, 2014

Chemistry
If 10 cm3 of ethanol is added to 10 cm3 of water, does the initial temperature of water change upon addition of ethanol?
November 6, 2014

chemistry
Use Table 9.4 to calculate an approximate enthalpy or heat of reaction for the combustion of one mole of methane gas (CH4) to form gaseous H2O and CO2. What Volume (in L) of methane is needed to produce 3287 kJ of heat for methane gas at 11 oC and 3.40 atm pressure?
November 5, 2014

chemistry
Using Table 9.4, calculate an approximate enthalpy (in kJ) for the reaction of 1.02 g gaseous methanol (CH3OH) in excess molecular oxygen to form gaseous carbon dioxide and gaseous water.
November 5, 2014

chemistry
A student obtained an average PV value of 42,000 in column (f) of the data table. If the syringe had been able to be adjusted to a volume of 35.0 mL, what would the pressure be inside the flask?
November 5, 2014

ENGLISH 10 HELP!!!
what motivated Shakespeare to write The Tragedy of Macbeth?
November 4, 2014

MACBETH HELP PLZZ!
what motivated the Gunpowder Plot of 1605
November 4, 2014

Physics
A vector is directed at an angle tangent above the +x axis, pointing into the first quadrant. If the x component of this vector is 10 m, the magnitude of the vector is?
November 4, 2014

chemistry
Draw the dominant Lewis structure for NO2+. Note, that this ion is isoelectronic with CO2. How many double bonds does this resonance structures have?
November 4, 2014

chemistry
Draw one of the Lewis structure of the N2O5. In each case one oxygen bridges the nitrogens (N-O-N single bond) and 2 other oxygens are bonded to each N. How many equivalent resonance structures are there that satisfy the octet rule and where O makes at most 2 bonds?
November 4, 2014

Chemistry
How do we use 2 indicators to confirm the pH of a solution?
November 4, 2014

Fraction
A fruit grower uses 1/3 of his land for bananas,3/8 for pineapples1/6 for mangoes and the remainder for oranges. What fraction of his land is used for oranges?
November 3, 2014

Fraction
A girl spends 1/4 of her pocket money on monday and 3/8 on wednesday. What fraction of her money is left
November 3, 2014

Algebra 2
Telephone numbers are made of 7 digits. Digits can be repeated but the first digit cannot be 0 or 1. How many different telephone numbers can be created? I believe you use combination function, but I am not sure how and where.
November 2, 2014

Algebra check?
ok it wont let me put spaces, sorry! 1. 3i - 10 over 8i - 5 Answer: 74 over 89 + 65 i over 89 2. 11i^2 + 1 over -12i - 8 Answer: 5 (2 - 3 i) over 26
November 2, 2014

Algebra check?
Sorry the first post formatted weirdly. 1. 3i - 10 --------- 8i - 5 Answer 74 65i ---- + ----- 89 89 2. 11i^2 + 1 ------------ -12i - 8 Answer: 5 (2 - 3 i) ------------- 26 3. square root -25 * 8 square root -49 Answer: -280 4. square root -64 + 12 square root -36 Answer: 80 i...
November 2, 2014

Algebra
(sorry this formatted weirdly, it's meant to be this if you can't tell) 1. 3i - 10 over 8i - 5 Answer: 74 over 89 + 65 i over 89 2. 11i^2 + 1 over -12i - 8 Answer: 5 (2 - 3 i) over 26
November 2, 2014

Algebra
Can you tell me if my answers are correct for these problems? 1. 3i - 10 --------- 8i - 5 Answer 74 65i ---- + ----- 89 89 2. 11i^2 + 1 ----------- -12i - 8 Answer: 5 (2 - 3 i) ------------- 26 3. square root -25 * 8 square root -49 Answer: -280 4. square root -64 + 12 square ...
November 2, 2014

physics
The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 45.7 cm and a mass of 9.1kg. How many revolutions did one of the front tires (assuming only the back tires spun upon ...
November 2, 2014

math
let f(x)=-5x+6 find and simplify f(x+2) f(x+2)=___
October 30, 2014

ap chem
Under certain conditions, the reaction 3 A + 4 B → 5 C is observed to proceed at a rate of 0.0106 M · s−1. What is the corresponding rate of change in product C? 1. 0.0318 M · s−1 2. 0.0106 M · s−1 3. 0.00353333 M · s−1...
October 30, 2014

physics
Find the x- and y-coordinates of the center of gravity of a 4.00 ft by 8.00 ft uniform sheet of plywood with the upper right quadrant removed as shown in the figure below. The dimensions of the cutout are a = 4.50 ft and b = 1.70 ft. HINTS: Think of the board as being made of ...
October 28, 2014

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