Friday
October 21, 2016

# Posts by nick

Total # Posts: 1,270

lever
What is the definition of a lever
November 3, 2010

A bowler rolls a 5 kg bowling ball down a magical frictionless bowling alley. The ball accelerates at an average rate of 2 m/s^2. How much force did the bowler apply to the ball?
November 3, 2010

Physics
A novice skier, starting from rest, slides down a frictionless 35.0 degrees incline whose vertical height is 140 m. 1. How fast is she going when she reaches the bottom?
November 2, 2010

orgo
Which acid, maleic or fumaric acid appears to be more reactive to bromine addition? How does the cis/trans affect this?
November 2, 2010

Organic Chemistry I
Which acid, maleic or fumaric acid appears to be more reactive to bromine addition? How does the cis/trans affect this?
November 2, 2010

why did us want to buy small part of louisiana territory
November 1, 2010

Physics
A 87 g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 76 cm. 1. What is the speed of the arrow as it leaves the bow?
November 1, 2010

Physics
A softball having a mass of 0.25 kg is pitched at 96 km/h. By the time it reaches the plate, it may have slowed by 9.0%. 1. Neglecting gravity, estimate the magnitude of the average force of air resistance during a pitch, if the distance between the plate and the pitcher is ...
November 1, 2010

Physics
A novice skier, starting from rest, slides down a frictionless 35.0 degree incline whose vertical height is 140 m. 1. How fast is she going when she reaches the bottom?
November 1, 2010

Physics
Two railroad cars, each of mass 7350 kg and traveling 80 km/h in opposite directions, collide head-on and come to rest. 1. How much thermal energy is produced in this collision?
November 1, 2010

Physics
A spring has a spring stiffness constant, k, of 420 N/m . 1. How much must this spring be stretched to store 30 J of potential energy?
November 1, 2010

Physics
A 66 kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 14 m, and falls a total of 34m. 1. Calculate the spring stiffness constant of the bungee cord, assuming Hooke's law applies. 2. Calculate the maximum acceleration she ...
November 1, 2010

calculus
find the inverse of q(x)=(x-5)^2
October 31, 2010

calculus
find the inverse of q(x)=(x-5)^2
October 31, 2010

algebra
For 1983 through 1995, the amount of private donations D (in millions) allocated to education can be modeled by D= 1.78t^3-6.02t^2+ 752t+ 6701 where t is the number of years since 1983. In what year was 14.3 billion of private donations allocated to education? (My main ...
October 30, 2010

chemistry
Thank you. I had quite a bit a trouble with this and appreciate the quick response.
October 30, 2010

chemistry
I'm kind of having difficulty with a question involving dimensional analysis. I'm confused how I would convert some units into others and what to divide. Here's the question. One 5lb Hershey's kiss is equivalent to how many little Hershey's Kisses? (1 ...
October 30, 2010

MATHEMATICS
HOW TO SOLVE THIS EQUATION: 0.2*Z + LOG(10.2*Z)= 3.512 THANKS IN ADVANCE
October 29, 2010

Chemistry
Cu (I): CN- Pb2+: CN-, SO3^2-, PO3^3-,MnO4- Ca2+: CN- Al3+: CN-, SO3^2-, PO3^3-,MnO4- Cr5+: CN-, SO3^2-, PO3^3-,MnO4- Pb4+: CN- Sn2+: CN- Mn2+:MnO4- Ag+:CN-, SO3^2-, PO3^3- H+: CN-, SO3^2-, PO3^3-,MnO4-
October 27, 2010

Math PIZZAZZ
Yeah it's halo
October 25, 2010

pre-algebra
what is 6 divided by 1 5/16?
October 24, 2010

pre-algebra
it takes 1 cup of liqiud fertilizer to make 7 1/2 gallons of spray. How much liquid is needed to make 80 gallons of spray?
October 24, 2010

chemistry
Which of the following would have a positive change in standard entropy at constant temperature? Choose all that apply. A) Burning octane to form carbon dioxide gas and water vapor B) Freezing titanium C) The endothermic dissolving of ammonium nitrate solid in water D) ...
October 20, 2010

algebra
10 2/3
October 19, 2010

Organic Chemistry I
You have isolated one of the isomeric dimethylcyclopentanes. on reaction it gives you 3 monochloroisomers, which of the possible pentanes is it? How do i do this? they don't give any choices, so how do i figure it out?
October 18, 2010

Maths Calculus Derivative Integral - Urgent Please
Use 2nd Fundamental Theorem of Calculus to find derivative of f(x) = integral of 2x^2 (at the top) to x-5 (at the bottom) of square root of Sin(x)dx
October 18, 2010

physics
sin of angle = opp/hyp (SOH) cos of angle = adj/hyp (CAH) tan of angle = opp/adj (TOA)
October 18, 2010

math
7n^2+9n+2 (7n + 2)(n + 1)
October 17, 2010

Math
Ok, so if I change it to 2x^2 to x-5 of square root of Sin(x)dx, does it make sense? We haven't done any examples with an x in both the top and bottom of the integral sign. Thanks
October 17, 2010

Math
Use 2nd Fundamental Theorem of Calculus to find derivative of f(x) = integral of 2x^2 to x-5 of square root of Sin(t)dt. Please help.
October 17, 2010

math
October 17, 2010

Physics
idk help
October 15, 2010

chemistry
In which solution (acidic, basic, neutral water, or doesn't matter) is potassium bromide most soluble? a. acidic b. basic c. neutral d. doesn't matter
October 10, 2010

chemistry
A buffer solution is 1.00 M in NH3 and 1.10 M in NH4Cl. If 0.230 moles of NaOH are added to 1.00 L of the buffer, what is its pH? Assume the volume remains constant. Kb of NH3 = 1.8 multiplied by 10-5.
October 8, 2010

chemistry
How many grams of HCOOH are needed to make 3.7 liters of aqueous solution of pH=3.5? I have followed the steps for a similar problem posted;I found x to 3.16e-4 mol/L but I'm having trouble converting it to grams.
October 6, 2010

chemistry
x=3.6e-4 mol/L x 3.7L x 43.06g HCOOH/mol = 0.050g HCOOH. my online homework counted this as incorrect. am I not going about it the right way?
October 6, 2010

chemistry
I found that problem, however I'm having trouble finding the amount of gram. I found x to 3.16e-4 mol/L
October 6, 2010

chemistry
How many grams of HCOOH are needed to make 3.7 liters of aqueous solution of pH=3.5?
October 6, 2010

Thermochemistry
Path A A sample of gas in a cylinder of volume 3.96 L at 327 K and 3.28 atm expands to 7.34 L by two different pathways. Path A is an isothermal, reversible expansion. Calculate the work for Path A. Answer in units of J. Path B Path B has two steps. In the first step, the gas ...
October 5, 2010

AP Chemistry !
Can you help me with this? If you can, do it as detail as you can. If not, you can just give me the answer, i'll try to figure how you did it :| A sample of gas in a cylinder of volume 3.96 L at 327 K and 3.28 atm expands to 7.34 L by two different pathways. Path A is an ...
October 5, 2010

AP Chemistry
What is the value of w (work) when 2.6 moles of H2 expands from 25 liters to 50 liters against a constant external pressure of 1 atm, then expands further from 50 to 100 liters against a constant external pressure of 0.1 atm? Answer in calories. Answer in units of cal.
October 5, 2010

geometry
what is the area of a hexagon with a 48 inch perimeter? i know its 166.277 but i need that in square root form?
October 3, 2010

AMERICAN HISTORY
After the Emancipation Proclamation, many African Americans A)boarded trains for the West. B)opened weapons factories. C)rushed to join the Union army. D)started getting paid by planters.
October 1, 2010

HISTORY
During the early part of the war, Lincoln's main goal was to.. A.)reduce the power of the states. B.)preserve the Union. C.)stop the spread of slavery. D.)free the slaves.
October 1, 2010

history
so they bring out their own opinion? yes I think politics would be more influential then. is there anything else that would back that up?
September 27, 2010

history
law because you cant change it so you have it follow it?
September 27, 2010

history
-Law: Original intent: Literalism Meaning of the words Logical reasoning Stare decisis Balancing approaches -Politics: Preference-based approaches Strategic approaches External factors Public opinion Political partisans Interest groups
September 27, 2010

history
Discuss the role of law and politics in Supreme Court decision making. Which is more influential? Why?
September 27, 2010

MATH
A triangle with vertices A(–3, 4), B(3, 1),and C(–1, –5) is translated 5 units left and 3 units up. Find the coordinates of A', B', and C'.
September 27, 2010

MATH
28. Chase Quinn wants to expand his cut-flower business. He has 12 additional acres on which he intends to plant lilies and gladioli. He can plant at most 7 acres of gladiolus bulbs and no more than 11 acres of lilies. In addition, the number of acres planted to gladioli G can...
September 27, 2010

MATH
A triangle with the vertices A(–3, 4), B(3, 1), and C(–1, –5) is dilated by a scale factor of 2. Find the coordinates of A', B', and C'.
September 27, 2010

MATH
Which term(s) describe(s) the system? 3x – 2y = 7 –9x + 6y = –10 dependent consistent and dependent consistent and independent inconsistent
September 27, 2010

MATH
Which term(s) describe(s) this system? 4x + y = 8 3x – 2y = –5 dependent consistent and dependent consistent and independent inconsistent
September 26, 2010

preschool
September 23, 2010

physics
total normal stresses of 110 and 40 kpa are applied to two planes at right angles in an element of soil. the shear stress acting on those palnes is 20 kpa. what must be the value of the pore pressure in the element if the minor principle stress in the elemnt is to be zero?
September 19, 2010

see out of 500 if 6 people leave then how many will leave out of 600,000. so it will be (600,000 * 6) / 500.
September 19, 2010

soil mechanics
total normal stresses of 110 and 40 kpa are applied to two planes at right angles in an element of soil. the shear stress acting on those palnes is 20 kpa. what must be the value of the pore pressure in the element if the minor principle stress in the elemnt is to be zero?
September 19, 2010

take 2 on left hand side which would be in denominator anr square both the sides so it will be (x/2)^2 = 6x-36 now solve the equation and thr u go with the ans.
September 19, 2010

maths
for tan2x=3 i get should get two values 71.56 and 251.56 but i dnt knw how to solve to get this two values. pls help me with this. thanx in advance.
September 19, 2010

AP Chemistry
HBr is mixed with water. Which is the best description of what you would expect to find in the solution? 1. H3O+, Br1−, and water molecules 2. HBr molecules, H3O+, Br1−, and water molecules 3. Br+, OH1−, and water molecules 4. HBr molecules and water ...
September 17, 2010

AP Chemistry
so what would be the answer?
September 17, 2010

AP Chemistry
Although soluble barium compounds are toxic, suspensions of insoluble barium sul- fate are routinely swallowed for upper gas- trointestinal X-ray studies. Why is barium carbonate not used? 1. Barium carbonate is too expensive. 2. Barium carbonate is soluble in plain wa- ter. 3...
September 17, 2010

math
m of angle 7=2x + 10 m of angle 3=3x - 15
September 16, 2010

calculus
Assume a substance has a half-life of 11 years and the initial amount is 144 grams. How much remains at the end of 5 years? How long will it be until only 30 % remains?
September 14, 2010

language
I am trying to do a report on the following and can't find any sites that contain info to make report. Looking for various types of humans that have lived on earth since time began. thanks for any help
August 26, 2010

college- strength of material
Thnx drwl but i knw the fomulas but i dnt knw hw to plot a graph wen juz max load is given.
August 19, 2010

college- strength of material
i have initial and final gauge length and diameter and also have max load. Now i have to draw stress strain diagram. I know how to draw tht graph but i a not provided with failure load or yield load so i am not sure how to graph. We had performed experiment and data was given ...
August 19, 2010

college
hey we performed experiment and lecturer mailed the results which doesnt have any series of results just one result. And gauge length is length of the specimen used.
August 18, 2010

college
I have initial and final gauge length and diameter and also have max load. Now i have to draw stress strain diagram. I know how to draw tht graph but i a not provided with failure load or yield load so i am not sure how to graph. Appreciate any help. Thanx in advance
August 18, 2010

Chemistry
(50g)(0.107 cal/g degreesC)(tfinal-15C) +(25g)(1.000 cal/g degreesC)(tfinal-45C) is this correct
August 7, 2010

Chemistry
what is the final temp of the combination when 50 grams of chromium at 15 degrees celcius is added to 25 milliliters of water at 45 degrees celcius?
August 7, 2010

trigo
sin 47 degree 29 minutes = x/4728 x=4728(sin 47 degrees 29 minutes) x=3484.92m cos 47 degree 29 minutes= y / 4728 y= 4728(cos 47 degrees 29 minutes) y= 3195.20 m Am i correct?
August 3, 2010

Your boss wants to send a brief email message welcoming employees recently transferred to your department from your Hong Kong branch. They all speak English, but your boss asks you to review his message for clarity. What would you suggest your boss change in the following ...
July 28, 2010

Physics
Agree with Charlie, but try finding the net force and use Newton's 2nd law maybe.
July 6, 2010

English
So you go to Keystone Online Highschool? 9th grade? Me too. These answers were very helpful in me constructing my own answers. And you made many spelling errors, you also only had 1 space instead of 2 spaces after a period in many places. You should try putting your papers ...
June 24, 2010

PARTICLE PHYSICS
particle A has a mass of 2 and a charge of -1. particle B has a mass of 2 and a charge of +1. are particle A and particle B necessarily antiparticles? explain your answer
June 9, 2010

Chemistry
15. What volume of NH3 at STP is produced if 25.0g of N2 is reacted with an excess of hydrogen gas? N2 + 3H2 →2NH3
June 3, 2010

fluid mechanics
I have got differential pressure from an inclined manometer to be 2.8kPa and density of the fluid is 784kg/m^3. I need to calculate the manometer datum height. how do i do tht?? i already did it using formula pressure=density*g*h but i want ans to be 0.165 meters which i dnt ...
May 30, 2010

fluid mechanics
yes i used the ame formula but didn't get the correct ans. cn u help me solve it. i want ans to be 6.5 inch (0.165 meters).
May 29, 2010

fluid mechanics
I have got differential pressure from an inclined manometer to be 2.8kPa and density of the fluid is 784kg/m^3. I need to calculate the manometer datum height. how do i do tht?? thnx for the help in advance.
May 29, 2010

Math Algebra 1a
Soybean meal is 18% protein, cornmeal is 9% protein. How many pounds of each should be mixed together in order to get a 360-lb mixture that is 10% protein? Cornmeal-how many pounds:__________ Soybean meal-how many pounds:______
May 27, 2010

m/c
sample statistic
May 20, 2010

Geometery
How would I calculate the perimeter of a hexagon (which can be divided into 6 congruent equilateral triangles) which is inside a circle with an area of 314^2 cm? Many thanks
May 13, 2010

Math
How would I calculate the perimeter of a hexagon (which can be divided into 6 congruent equilateral triangles) which is inside a circle with an area of 314^2 cm? Many thanks
May 11, 2010

Algebra
Hi, how would I factorise x^2-100?
May 7, 2010

College Chemistry
A spherical rubber balloon has an initial thickness of 0.45mm, and diameter 250mm. Final diameter of 1000mm. Find final thickness, true stress in the plane of the balloon wall, Air pressure required. (Assume rubber is idea and obeys Guassian statistics, and take the shear ...
May 6, 2010

Chemistry
A spherical rubber balloon has an initial thickness of 0.45mm, and diameter 250mm. Final diameter of 1000mm. Find final thickness, true stress in the plane of the balloon wall, Air pressure required. (Assume rubber is idea and obeys Guassian statistics, and take the shear ...
May 6, 2010

polymer chemistry
A spherical rubber balloon has an initial thickness of 0.45mm, and diameter 250mm. Final diameter of 1000mm. Find final thickness, true stress in the plane of the balloon wall, Air pressure required. (Assume rubber is idea and obeys Guassian statistics, and take the shear ...
May 5, 2010

chemistry
A spherical rubber balloon has an initial thickness of 0.45mm, and diameter 250mm. Final diameter of 1000mm. Find final thickness, true stress in the plane of the balloon wall, Air pressure required. (Assume rubber is idea and obeys Guassian statistics, and take the shear ...
May 5, 2010

math
A sheet of plywood measures 4 feet by 8 feet. Armand wants to build a dog house using one whole sheet of plywood for the floor. a. Armand needs to put a "2 by 4" under the outer edges all the way around the floor, and another "2 by 4" that runs down the ...
May 4, 2010

Chemistry 102
For a question like “calculate the pH of an aq.solution that is 1.0 M CH3COOH and 1.0 M CH3COONa, how do you know to write the equation like this: CH3COOH + H2O => H3O+ + CH3COO- and not like H3O+ + CH3COO- => CH3COOH + H2O for the ICE chart. This would switch the ...
May 3, 2010

chemistry
SO2 (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0 °C. The partial pressure of CO2 in the container was __________ atm.
May 2, 2010

Physics
given; r2 = 0.05 m r1 = 0.01 m Q = 10 liters/min = 10 E-3/60 = 1.67 E-4 m³/s P2 = 10^5 Pa ρ = 1000 kg/m³ no. # (a) Q = (A2)(v2) Q = π(r2)²)(v2) 1.67 E-4 = π(0.05)²)(v2) V2 = 0.0212 m/s no. # (b) V1 = (r2/r1)² (V2) = (5/1)² (0.0212) ...
April 27, 2010

Physics
A) V1= 10L/((pie)(.05^2)(1000)(60))=.0212m/s B) V2= 10L/((pie)(.01^2)(1000)(60)=.5307m/s C)P=P1 - P2 = 1000*[(.0212)²/2 - (.5307)²/2] P1 - P2 = 140.5 Pa P2 = 10^5 - 140.5 = 99859.5 Pa.
April 27, 2010

Math 102
if you have a pizza with a diameter of 20 that is cut equally into 4 pieces, one way horizontal and one way vertical. how do i figure out where to place 2 non-center vertical cuts so that the pizza has 8 equal parts? i found the area for the circle to be 314.159 (divided by 8...
April 27, 2010

Find the numbers that each letter stands for in the problem below. EFGH X 4 = HGFE E= F= G= H=
April 22, 2010

Science
That depends on the density of the object along with bouyancy. A 2g rock will sink in water whereas a 2000 kg boat will not (if made right). It doesnt matter what something weighs. An object floats because it displaces an amount of water equal to or more than its own weight. A...
April 22, 2010

math
Essentially you look for key words. "At most", "no more than", "does not exceed", etc. would mean less than or equal too. Taking your example, if the cost is at most \$4857.95, then it could be less, but it cannot be more. When x is less than or ...
April 21, 2010

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