Thursday

March 5, 2015

March 5, 2015

Total # Posts: 1,580

**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*

**government**

kayla
*April 4, 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*

**7th Grade Math**

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*

**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 7, 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 6, 2010*

**science**

If you have 3 liters of air in your lungs and 2/10 of that is oxygen, how many millimeters are in your lungs?
*December 6, 2010*

**Precalculus Someone please help**

Evaluate all six trigonometric functions at t, where the given point lies on the terminal side of an angle of t radians in standard position. (40/41, -9/41)
*December 6, 2010*

**physics**

The drawing shows a hydraulic chamber in which a spring (spring constant = 1292 N/m) is attached to the input piston, and a rock of mass 24.7 kg rests on the output plunger. The piston and plunger are at the same height, and each has a negligible mass. By how much is the ...
*December 6, 2010*

**Physics**

A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 50.0 kHz, and if the speed of sound in air is 340 m/s, what is the smallest insect a bat can detect?
*December 5, 2010*

**Physics**

A object-spring system oscillates with an amplitude of 4.0 cm. If the spring constant is 210 N/m and object has a mass of 0.50 kg, determine each of the following values. (a) the mechanical energy of the system J (b) the maximum speed of the object m/s (c) the maximum ...
*December 5, 2010*

**Physics**

The blades of a ceiling fan have a radius of 0.399 m and are rotating about a fixed axis with an angular velocity of +1.65 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 2.08 rad/s2. After 0.520 s have elapsed since...
*December 4, 2010*

**physics**

The drawing shows a hydraulic chamber in which a spring (spring constant = 1292 N/m) is attached to the input piston, and a rock of mass 24.7 kg rests on the output plunger. The piston and plunger are at the same height, and each has a negligible mass. By how much is the ...
*December 4, 2010*

**physics**

What is the longest wavelength for standing sound waves in a 102.0 cm long tube that is open at both ends?
*December 4, 2010*

**ms.sue**

so it would b 11 then
*December 1, 2010*

**ms.sue**

if y+2=13 woudlnt you add 2 too both sides amd get y=15?
*December 1, 2010*

**Algebra**

whats the problem?
*December 1, 2010*

**math**

so if u flip it the negative sign will go away and turn it too positive
*December 1, 2010*

**math**

1/3b=-3 i know u would divide both sides by 1/3 and it would cancell out the 1/3 and when u divide 1/3 by -3 you will get -1/9 so u flip it u willl get -9 right?
*December 1, 2010*

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