Tuesday
February 9, 2016

# Posts by josh

Total # Posts: 1,700

Chemistry
What mass of K2SO4 would you measure out to prepare 550mL of a .76 M solution?
May 9, 2011

Physics
So would that just be .65/1.8 and the answer is 0.36?
May 7, 2011

Physics
A student reading his physics book on a lake dock notices that the distance between two incoming wave crests is about 0.65 m, and he then measures the time of arrival between the crests to be 1.8 s. What is the approximate speed of the waves?
May 7, 2011

algebra
Given the function f(x) = −2x + 4, find x if f(x) = 20
May 7, 2011

Physics
a. Correct b. Incorrect c. Incorrect d. Correct e. Incorrect
May 4, 2011

physics
he question is: A spherical capacitor contains a solid spherical conductor of radius 0.5mm with a charge of 7.4 micro coulombs, surrounded by a dielectric material with er = 1.8 out to a radius of 1.2mm, then an outer spherical non-conducting shell, with variable charge per ...
May 1, 2011

physics
you see lightning and then count 4 seconds till you hear the thunder. From this you conclude that the lightning strike occurred_______ a. 1400m away b. 700m away c. none of the above Can you please show me how to figure out how to get the answer?
May 1, 2011

physics
These are problems I have been stuck on and can't figure out. Help would be greatly appreciated. 1. Blue and yellow light combinte to produce white light because ______ (Please explain what it's the correct answer) a.they absorb each other's wavelengths b. blue, ...
April 30, 2011

I'm not sure how to go about doing this. I feel like it's an easy question but im thinking to far into it. I want to say that Davis would be the first person to be let off & Carter would be the last person to be let off. I'm not sure what order the rest would be in...
April 28, 2011

math
4cot^2x-4/tanx+cosxsecx factorin algenraic single trig function
April 26, 2011

math (pre calc)
4cot^2x-4/tanx+cosxsecx write expression in factored form as an algebraic expression of a singletrig function
April 26, 2011

math
A Crime Wave
April 25, 2011

math
solve using the substitution method: 8x+5y=-12 x=12-4y
April 17, 2011

precalculus
An experiment begins with 8 cells, and the number of cells triples every week. If the expression a(b)^q computes the number of cells that are present q days after the experiment begins, how much is the value of b?
April 13, 2011

Precalculus
The bacteria in a 8-liter container double every 2 minutes. After 55 minutes the container is full. How long did it take to fill a quarter of the container?
April 13, 2011

Chemistry
Due to increased CO2 in the atmosphere, the pH of rainwater is more acidic than in the previous century. Use the following data to calculate the pH of unpolluted rainwater at 25°C: vol% in air of CO2 = 0.033; solubility of CO2 in pure water at 25°C and 1 atm = 88 mL ...
April 12, 2011

Math
On a certain road 20% of the vehicles are trucks, 16% are buses and the remainder are cars. (i) A random sample of 11 vehicles is taken. Find the probability that fewer than 3 are buses. [3] (ii) A random sample of 125 vehicles is now taken. Using a suitable approximation, ...
April 8, 2011

Chemistry
youre just screwed
April 6, 2011

Chemistry
How fast should a 58.1g tennis ball travel to have a de Broglie wavelength that is equal to that of a photon of green light (5.40 X 10^3 angstroms)?
April 5, 2011

Calculus
If an open box has a square base and a volume of 106 in.3 and is constructed from a tin sheet, find the dimensions of the box, assuming a minimum amount of material is used in its construction. (Round your answers to two decimal places.) height in length in width in
April 4, 2011

Math I'm so confused
Find the absolute maximum and absolute minimum values, if any, of the function. (If an answer does not exist, enter DNE.) f(x) = x2 − x − 5 on [0, 5] Come someone please show me how to do these problems? I'm lost
March 30, 2011

precalculus
log4 60
March 28, 2011

precalculus
log 60 4 estimate the following log
March 28, 2011

economics
Consider an economy with the production function L^(1/3) a) Derive the Labor demand Curve b) If Labor supply curve is L^s= (w/p), calculate the equilibrium levels of real wage, labor and output. c) Assume M^s= 45 and k=3 . What is the equation of the aggregate demand curve for...
March 27, 2011

CHEMISTRY
The equilibrium constant for the reaction, SO2(g)+ NO2(g) <----> NO(g)+ SO3(g) has been experimentally determined as a function of temperature. The results are presented in the table below. T (°F) KC 285 662 752 156 842 93.4 932 59.6 1022 40.2 If 0.0791 ft3 SO2, 0....
March 24, 2011

precalculus
A population doubles every 30 years. Assuming exponential growth find the following: annual growth rate: % continuous growth rate: %
March 23, 2011

chemistry
2.00 L of NO(g) at 1.00 atm and 25°C is reacted with 1.00 L of H2(g) at 2.00 atm and 25°C according to the following unbalanced equation. NO(g) + H2(g) ® N2(g) + H2O(g) Which, if either, is the limiting reactant?
March 23, 2011

math
the edges of 3 cubes are consecutive odd intergers. if the cubes aer stacked on a desk as shown, the total exposed surface area is 381. find the lenths of the sides of the cubes thanks!!
March 21, 2011

separation of variables
If dy/dt=-3y and if y=1, what is the value of t for which y=1/3? I got y=e^(-3t) but I wasn't for sure if it was correct.
March 21, 2011

separation of variables
how do you separate the variable dy/dx=-xy^2, y(1)=-0.25
March 21, 2011

separation of variables
how do you solve the variable dy/dx=-x^2y^2, y(4)=4
March 21, 2011

separation of variables
how do you separate the variable dy/dx=x^2/y given y=-5 when x=3
March 21, 2011

separation of variables
Find an equation of the curve that passes through the point (1,1) and whose slope at (x,y) is y^2/x^3.
March 21, 2011

Chemistry
Calculate the enthalpy of reaction. D + F --> G + M using the following equations and data: G + C --> A + B ΔH = +277 kJ C + F --> A ΔH = +303 kJ D  B --> M ΔH = -158 kJ
March 21, 2011

separation of variables
If dy/dx=-3y and if y=1, what is the value of t for which y=1/3? I got y=e^(-3t) but I wasn't for sure if it was correct.
March 21, 2011

Chemistry
Calculate the enthalpy of reaction. D + F --> G + M using the following equations and data: G + C --> A + B ΔH = +277 kJ C + F --> A ΔH = +303 kJ D  B --> M ΔH = -158 kJ
March 21, 2011

MATH
Hello! I am trying to finish a math assignment. it was a bunch of math questions, and I am having a very difficult time with 5 of them. I have the answers to them though. Could somebody please help me with AT LEAST a few!? thanks!! 1) A square swimming pool with a side ...
March 20, 2011

MATH
Hello! I am trying to finish a math assignment. it was a bunch of math questions, and I am having a very difficult time with 5 of them. I have the answers to them though. Could somebody please help me with AT LEAST a few!? thanks!! 1) A square swimming pool with a side ...
March 20, 2011

algebra
Perform the indicated operation 1/3divided by 3/8
March 16, 2011

maths exponential functions
I have a maths assignment and i need help with this question my teacher is overseas at the moment and it is due when he gets back The Population P, of penguins in a certain region of Antarctica can be modeled by the relation P=Po (2) t/90, where t is time, measured in months ...
March 11, 2011

physics
A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 270 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.9 m/s relative to the shore, and then hops onto an identical floating log that is ...
March 9, 2011

Geometry
Find the volume of a sphere whose surface area is 804 u2
March 7, 2011

Math
How far does the bike go on one rotation of the pedal sprocket in gear 2c? Gear 2c = 1.95
March 7, 2011

Trig
Yeah sorry wasn't thinking when I posted that.
March 6, 2011

Trig
If = 58° and m = 120 in, what is the value of n to the nearest tenth of an inch?
March 6, 2011

precalculus
An investment decreases by 4% per year for 3 years. By what total percent does it decrease after the 3 years?
March 3, 2011

precalculus
An investment decreases by 4% per year for 3 years. By what total percent does it decrease after the 3 years?
March 3, 2011

world history
During the eighth century C.E., many of the rulers of Japan were A. women. B. commoners. C. from the merchant class. D. military strongmen
March 3, 2011

Bio
Why do scientists think that colonial organisms were important in the evolution of multicelluar organisms? thanks!
March 2, 2011

Bio
what is another method for classifying bacteria? (other than shape or cell wall structure). thanks! :)
March 2, 2011

precalculus
A bacteria culture initially contains 1500 bacteria and doubles every half hour. a) Find an expression for the number of bacteria after t hours. Q(t)= b) The number of bacteria after 20 minutes is (the answer must be an integer) c) The number of bacteria after 9 hours is
March 2, 2011

CHEMISTRY
Sulfur dioxide gas reacts with hydrogen sulfide gas to produce elemental sulfur (S8) and water vapor. Predict the temperature range over which this reaction is spontaneous.
March 2, 2011

Biology
We did this lab in which we used 3 brands of hand sanitizers and did the kirby bauer test. We measured the zone of inhibition for each of the three trials in millimeter. I need to make a graph, probably a line graph but im not sure what to put for the x and the y axis because ...
February 28, 2011

Physics
What happens to a magnetic field if the current carrying wire A has three times as many loops but the same current as the current carrying wire B?
February 28, 2011

English
i AGREE, seems like he would be talking or thinking about his dead son, thats what i would do, Maybe the author intended for Amy to talk about the fence instead to show his cold personality.
February 28, 2011

Consumer Math
Thanx, the google search really doesnt help I already tried that, but I'll look in our post office, Thanx again!
February 28, 2011

Consumer Math
The math lesson I am currently working on is "Income Tax Return 1040EZ" I need a certain table to figure out the problems, that table is not given. In the lesson it says to "Use the current Tax Table supplied by your local IRS to find the tax liability". I...
February 28, 2011

English
an article is like, an, in, a...ect.
February 28, 2011

statistics
The test scores for 9 students on the Unit 1 test were 35, 25, 50, 95, 80, 60, 45, 100, and 90. What is the value of the second quartile for this data set?
February 26, 2011

Math Trivia
yah thanks! i am having a hard time with number one. i know i could sit down and take a long time to do it...but i was wondering if their was a formula to it, or a quicker way to do it...
February 21, 2011

Math Trivia
1) A school has 1-- closed lockers. Larry comes into the school and "toggles" every second locker, then Fred toggles every 3rd, Bob every 4th, etc, up to Zoe who toggles every 100th locker. After all this"toggling" how many lockers are open? 2) If you take ...
February 21, 2011

Chemistry
Calculate the pH of a 0.250M solution of Sulfurous acid, H2SO3.
February 18, 2011

Chemistry
correction: and melted with 4.38g of campor,
February 17, 2011

Chemistry
when 0.154 g of sulfur is finely grounded and melted with campor, the freezing point of the campor is lowered by 5.47 celsius. A)what is the molecular weight of sulfur? B)what is its molecular formula? fp of campor: 178.4 kf of campor: 40
February 17, 2011

Ethics
Has email impact on communication been positive or negative? why? Would you judge somebody by the quality of his or her email message? why or why not? Could someone professional reputation be enhanced or hindered by the quality and effectiveness of his or her internet ...
February 16, 2011

Literary Analysis and Composition
lol...im taking the same test!
February 16, 2011

math
Find the linear block code generator matrix G, if the code generator polynomial is g(x) = 1 + x^3 for a (7,4) code.
February 15, 2011

Math
If the code generator polynomial is g(x) = 1 + x^2 for a (5,3) code, find the linear block code generator matrix G.
February 15, 2011

Math
Mr. Pennypacker left half of his estate to his wife; \$40,000 to his daughter; half of what remained to his butler; half of what remained for the care of his favorite dog; and the remaining \$6,000 to charity. What was the value of Pennypacker's estate?
February 15, 2011

Physiology
What is the difference between the function of autonomic transmitters and receptors? In what way or how do they regulate effector cells that are dually innervated? Thanks!
February 15, 2011

derivatives
Explain how a long stock and long put strategy equals the cash flow from a long call strategy.
February 13, 2011

Math
Consider an antenna transmitting at 900 MHz. The reciever is traveling at a speed of 40km/h. Calculate its Doppler shift.
February 9, 2011

Physics
Mars has a radius of about 0.53 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.
January 31, 2011

Physics
A 600-kg geosynchronous satellite has an orbital radious of 6.6 Earth radii. What gravitational force does Earth exert on the satellite?
January 31, 2011

Math
what is the square feet of a box with two sides of 2 2/3 x 2 2/3 each?
January 27, 2011

chemistry
How much heat is associated with converting 100 g of steam at 112 degrees C to ice at -5.3 degrees C
January 27, 2011

English
Now I am confused. What about these sentences? I am happy to say that everyone in my family felt good/well after eating my meal. Is it well because it is an adverb that describes felt?
January 25, 2011

English
I felt good/well when my family said that they enjoyed it. I think that I should pick well because it is an adverb that describes how I felt, is this correct?
January 25, 2011

English
Which word should I use and why? I did my best to make a real/really good dinner.
January 25, 2011

Physics
A 390 kg motor boat, moving down a frictionless ramp, is connected over a massless pulley to a 193 kg counterweight that rests on a horizontal surface. The ramp is inclined by 28.6°, and the co-efficient of kinetic friction between the couterweight and the horizontal ...
January 25, 2011

physics
A major-league pitcher can throw a baseball in excess of 40.2 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 17.7 m away from the point of release?
January 21, 2011

physics
sealed metal container can withstand a pressure difference of 0.630 . The container initially is filled with an ideal gas at 12 and 0.80 To what temperature can you cool the container before it collapses? (Ignore any changes in the container's volume due to thermal expansion
January 15, 2011

English 3
Great Gatsby Chapter 1. Why is Nick telling the story? Why is nick "confused and disgusted" at the end of this chapter?
January 13, 2011

Chemistry
U+F6-->UF6 If 8.4 g UF6 are recovered from 55 kg of ore, what is the weight % of uranium in the ore? Answer in units of %
January 11, 2011

math
The equations y=-2X+12, y=6-X, and X=0 enclose a region in quadrant I. when that region is reflected over the line y=6-X, a portion of the reflection is in quadrant II. Find the area of that resulting region.
January 11, 2011

Criminal justice
Can someone please help. Who is responsible for the concept of crime prevention? Ive been stuck on this question for two days and i need help urgent. Thank you!
January 8, 2011

Statistics
In a study to determine if you can predict stock price based on P-E ratio, what is the response variable and what is the explanatory variable? How would you label the X and Y axes in a scatterplot of the data?
January 4, 2011

physics
a 4.0 m hockey puck is moving horizontally at 5.0 m/s. the amount of work that must be done on the puck to stop it is?
December 19, 2010

calc
Given [(x-5)/(x-3)]^2 . Find any stationary points and any points of inflection. Also find any horizontal and vertical asymptotes.
December 19, 2010

us history
it started on 1879. They fought over riches.bob shbaca was the leader.
December 16, 2010

chemistry
When NH3(aq) is added to Cu^2+ (aq) a precipitate initially forms. what is its formula?
December 14, 2010

14÷2=7 7 +14=21 21×2=42 42×2=84 Answer:84 this isn't hard I'm 6 grade
December 14, 2010

Physics
A 16kg child on roller skates rolls 2m down an incline at 20 degrees with the horizontal. With no friction, what is the total kinetic energy of the child at the bottom of the incline?
December 13, 2010

Chemistry
Gravimetric analysis does not always involve a precipitate. Consider the following problem. A mixture of calcium carbonate and calium oxide has a mass of 8.35 grams. When heated strongly, the CaCO3 in the sample decomposes into solid CaO and carbon dioxide gas. The calcium ...
December 10, 2010

History
Can you please find any documents (pictures, quotes, info) for the following question: Compare and contrast the economy and politics that impacted the global economy of Europe during the Middle Ages and the Renaissance. Thank You
December 9, 2010

H NMR
what is the structure of the compound that is an obvious question for NMR
December 8, 2010

orgo - H NMR
C4 H10 O2 ppm = 3.25 singlet 6H ppm = 3.45 singlet 4H
December 8, 2010

H NMR
C4 H10 O2 ppm = 3.25 singlet 6H ppm = 3.45 singlet 4H
December 8, 2010

Chemistry
Gravimetric analysis does not always involve a precipitate. Consider the following problem. A mixture of calcium carbonate and calium oxide has a mass of 8.35 grams. When heated strongly, the CaCO3 in the sample decomposes into solid CaO and carbon dioxide gas. The calcium ...
December 8, 2010