Tuesday

October 25, 2016
Total # Posts: 962

**Chemistry**

Thank you Bob

*June 28, 2012*

**Chemistry**

Nitrogen Oxides, NOx (mixture of NO and NO2). The NOx in the atmosphere is slowly broken down to N2 and O2 in a first-order reaction. The average half-life of NOx in the smokestack emissions in a large city during daylight is 3.9 hours. (a) Starting with 1.50 mg in an ...

*June 28, 2012*

**physics**

a pneumatic nail gun with muzzle speed of 37m/s fires a 5.0cm nail directly into a hard wood that stops the nail just when it is full embedded in the wood. Assuming the nail's deceleration to be constant, what is its magnitude?

*June 6, 2012*

**Chemistry**

so I found out I need to extrapolate the temperature, but how do I do that, if I only have a graph and no other information

*May 30, 2012*

**Chemistry**

Plus, would that be the temperature I use in my calculations of Heat, or do I take the initial temperature of my column and the final one? I doubt it's this though

*May 30, 2012*

**Chemistry**

I had a lab about calorimetry where we would have a temperature probe in a calorimeter cup and then pour hot water into it to form a mixture until our graph (automatically plotted from the data that's recorded by the computer). Now for the report they ask us to draw a ...

*May 30, 2012*

**Chemistry**

I see, thanks a lot Bob!

*May 29, 2012*

**Chemistry**

Derive a formula for the molar mass of the solute in terms of the freezing point depression, deltaT, the freezing-point constant, Kf, and the masses of solvent, msolvent, and solute, msolute, used in an experiment like this one. SHow your work and include all unites in your ...

*May 29, 2012*

**Chemistry**

I get it now, thanks again Bob

*May 23, 2012*

**Chemistry**

Thanks Bob! As for deltaS, it just says Entropy increases in all spontaneous reactions, there's nothing more specified, so I assumed that it was deltaS and not deltaSuniverse

*May 23, 2012*

**Chemistry**

(b) deltaG < 0 , are product-favored and occur with rapid transformation of reactants to products. HOw is this incorrect? deltaG < 0 is product-favored and is rxn forward. Thank you

*May 23, 2012*

**Chemistry**

So when there's a spontaneous reaction, deltaS is > 0 , I confused that with increase. I still don't see how it's incorrect

*May 23, 2012*

**Chemistry**

Explain why each of the following is incorrect: (a) Entropy increases in all spontaneous reactions. Wouldn't (a) be actually correct? Because when there's a spontaneous reaction, you have less stable molecules and more disorder. It will be lower in some reactions than ...

*May 23, 2012*

**GEOMETRY**

Given that AB is a tangent of the circle with the center at X, AB = 12, and XD = 2.5, which is the length of DB?

*May 23, 2012*

**physics**

In one room the radiator has a dark color (emissitivity = 0.818). It has a temperature of 64.8 oC. The new owner of the house paints the radiator a lighter color (emissitivity = 0.417). Assuming that it emits the same radiant power as it did before being painted, what is the ...

*May 21, 2012*

**physics**

A cubical piece of heat-shield-tile from the space shuttle measures 0.18 m on a side and has a thermal conductivity of 0.065 J/(s·m·C°). The outer surface of the tile is heated to a temperature of 1050°C, while the inner surface is maintained at a ...

*May 21, 2012*

**E&M Physics**

this is the image ww w.ux1.eiu.edu/~cfadd/1360/24Gauss/24Hmwk/24.05. html

*May 18, 2012*

**E&M Physics**

Hello, I have this number where I don't understand why there's a negative sign to it. Consider a closed triangular box resting withing a horizontal electric field of magnitude E = 7.8 x 104 N/C as shown here. Calculate the electric flux through (a) the vertical surface...

*May 18, 2012*

**Chemistry**

I got it, oxidation state of reactants is going to be (+5) and products (-4) so it's an oxidation reaction, thanks for the info Bob!

*May 16, 2012*

**Chemistry**

so the oxygen molecule detachs from the Hydroxide and moves to electronegative species right?

*May 16, 2012*

**Chemistry**

Hello, I had a lab about calorimetry and one of the questions was if the reaction of acetone with hypochlorite is an oxidation/reduction or acid/base. Would the answer be: oxidation/reduction because the oxygen from the hydroxide from the Sodium hydroxide detaches and joins ...

*May 16, 2012*

**Ashford**

Employee motivation

*May 10, 2012*

**Chemistry**

thanks!

*May 9, 2012*

**Chemistry**

3) You pour 240 mL of Coke into a glass, where the T of the beverage is at 10.5 *C. You then add one ice cube of 45g. Determine the final temperature and the amount of ice remaining, if any. So I know that there won't be any more ice left because they will reach thermal ...

*May 9, 2012*

**physics**

A steel (Young's modulus 2.0 x 1011 N/m2) wire is strung between two supports attached to a ceiling. Initially, there is no tension in the wire when it is horizontal. A 88-N picture is then hung from the center of the wire, as the drawing illustrates, so the ends of the ...

*April 14, 2012*

**Chemistry please help**

How would an HA acid behave in water if it were a strong acid, weak acid, and non-electrolyte?

*March 31, 2012*

**Chemistry Help Please**

i do not understand how to solve this problem, please help 10.0mL 0.5M sulfuric acid can neutralize what volume of 0.5M ammonium hydroxide?

*March 31, 2012*

**calculus**

find the total differential of the function f(x,y)= xye^(x+y)

*March 30, 2012*

**calculus**

find the total differential of the function. f(x,y) = 5y/x-y

*March 30, 2012*

**statistics**

A Packaging Company sells soda and claims each can contains 12 oz. A random sample of 15 sodas yielded a sample mean of 11.2 oz. Given the sample standard deviation is 0.3 oz, estimate the margin of error for a 90% confidence interval.

*March 29, 2012*

**statistics**

A poll claims that 70% of the population is for a new amendment. A random sample of 49 people showed that 27 voted in favor of the new amendment. Give a 95% confidence interval. Give lower limit and upper limit accurate to four decimal places

*March 29, 2012*

**math**

If Pete colored 1/2 of a poster and Rebecca colored 1/3 of the poster. What fraction still needs to be colored?

*March 29, 2012*

**English 11**

please help 1 is right.

*March 12, 2012*

**English 11**

1. Olaudah Equiano wrote (1 point) a book of letters to his African family. a history of the West Indian slave trade. stories of early slavery in Virginia. the first autobiography by a black man in America. 2. The term “the Middle Passage” refers to (1 point) the ...

*March 12, 2012*

**Maths**

Mr Jones takes 4 hours to paint a fence. Mark his son takes 6 hours to paint the same fence. How long does it take for them both to paint the fence?

*March 7, 2012*

**math**

33inches

*March 7, 2012*

**english**

Type a short character sketch of a fictional Puritan named Justice Johnson based on what you have learned about the Puritans Make certain that you describe how he dresses how he lives what he believe?

*February 16, 2012*

**math**

You are taking your friend to lunch and have exactly 15 dollars to spend. You want to leave a 15% tip. What is the maximum amount of money you could spend?

*February 7, 2012*

**criminal justice**

need a brief discribtion of crime scene

*January 29, 2012*

**College Math**

m=4

*January 28, 2012*

**Physics**

An electric current of 50 +/- 1 mA flows through an electric bulb filament that has a resistance of 10 +/- 2 ohm. Estimate the power dissipated by the filament and the associated error in the power.

*January 26, 2012*

**physics**

A uniform electric field ofmagnitude 384 V/m is directed in the positive x-direction. Suppose a 16 ìC charge moves from the origin to point A at the coordinates, (20 cm, 60 cm). What is the absolute value of the change in potential from the origin to point A? Answer in ...

*January 23, 2012*

**Physics**

A speedboat starts from rest and accelerates at +1.98 m/s2 for 8.25 s. At the end of this time, the boat continues for an additional 5.58 s with an acceleration of +0.348 m/s2. Following this, the boat accelerates at -1.42 m/s2 for 7.22 s. (a) What is the velocity of the boat ...

*January 22, 2012*

**math**

3x^3/(3x)^3

*January 12, 2012*

**ALGEBRA 2**

T=I divided by PR

*January 12, 2012*

**Algebra 1**

(2p/9)exponent of 3

*January 12, 2012*

**English**

Sorry, but my brothers typed some questions also so they used their name.

*January 9, 2012*

**English**

1) The following passage is an example of which literary element? "Give back your heart to itself, to the stranger who has loved you all your life, whom you ignored for another, who knows you by heart." a)paradox b)magical realism c)metaphor d)hyperbole* 2)In the ...

*January 9, 2012*

**English**

Can someone please check my answers?

*January 9, 2012*

**statistics**

If there were 10 distribution centers that have an output mean of 78 (in thousands), median of 65 and mode of 50, what would be the total output of the distribution centers?

*January 4, 2012*

**statistics**

If there were 10 distribution centers that have an output mean of 78 (in thousands), median of 65 and mode of 50, what would be the total output of the distribution centers?

*January 4, 2012*

**Physics**

A 0.350-kg ball is dropped from rest at a point 1.10 m above the floor. The ball rebounds straight upward to a height of 0.420 m. Taking the negative direction to be downward, what is the impulse of the net force applied to the ball during the collision with the floor?

*January 3, 2012*

**physics**

A 3.4-kg box is released on a horizontal surface with an initial speed of 4.8 m/s. It moves on the surface with a deceleration of 0.45 m/s2. Calculate the kinetic friction force on the box.

*January 3, 2012*

**ALgebra**

Indicate and explain the logical error in the following set of algebraic expressions Let a=b square both sides to get a^2=b^2 a^2=b*b Since a=b, then a^2=a*b Subtract b^2 from both sides a^2-b^2=a*b-b^2 Factor both sides: (a+b)(a-b)=b(a-b) Divide both sides by (a-b) (a+b)=b ...

*December 22, 2011*

**Physics**

A box is being pushed up the ramp by you at a 15 degree angle. The coefficient of kinetic friction between the box and ramp is .4. The box has a mass of 12 kg and you are pushing up the ramp with a force of 95N. What is the kinetic frictional force? What is the sum of forces (...

*December 7, 2011*

**english 9**

which paragraph of the article best supports the authors argument against clear cutting?

*December 7, 2011*

**World geography**

This very southern city in Africa is in an area of moderate rainfall

*December 6, 2011*

**English Comp. I**

Exercise 32.4 Please help with this assignment. I'm having trouble with it. Rive to clarify pronoun reference. Most can be revised in many ways. If a pronoun refers ambiguously to more than one possible antecedent, revise the sentence to reflect each possible meaning. 1. ...

*December 5, 2011*

**English Comp. I**

Exercise 32.4 Please help with this assignment. I'm having trouble with it. Rive to clarify pronoun reference. Most can be revised in many ways. If a pronoun refers ambiguously to more than one possible antecedent, revise the sentence to reflect each possible meaning. 1. ...

*December 5, 2011*

**precalculus**

Simplify the Factorial Expression. (3n+1)!*3!/(3n-2)!

*December 5, 2011*

**precalc**

Write the partial fraction decomposition of the rational expression. 6x^2+1/x^2(x-1)^2

*December 4, 2011*

**precalc/trig**

Write the partial fraction decomposition of the rational expression. 4x^2–19x+31/ (x+2)(x^2–4x+5)

*December 3, 2011*

**chemistry**

How much energy is required to heat 120.0g of water from 2.0°c to 24.0°c (Cp of H2O=4.184J/g

*December 1, 2011*

**Calculus**

If f(x) and g(x) are differentiable and lim(x->a) f(x)/g(x) exists, does it follow that lim(x->a) f '(x)/g'(x) exists (a converse to l'Hopital's Rule)?

*November 27, 2011*

**Mathematic**

. The number of vibrations per second made when a stretched wire is plucked varies directly as the square root of the tension in the wire and inversely as the length. If a 1.23 m long wire will vibrate 325 times each second when the tension is 115 N, determine the number of ...

*November 22, 2011*

**math**

f(x)=-8xlnx decreases over what domain

*November 21, 2011*

**calculus**

dang it. well the diagram was what my teacher gave me to go by. the 81 is the diagonals on both sides, or thats the way its written on the sheet of paper. and 8 is the length of the base.

*November 17, 2011*

**calculus**

a trapezoid is a quadrilateral with (only) two sides (called bases) that are parallel. an isosceles trapezoid has two equal legs. the area of a trapezoid is A=(1/2)*h*(b1+b2) where b1 and b2 are the two parallel bases and h is the altitude. your problem: a water viaduct has a ...

*November 17, 2011*

**calculus**

a fence 8 ft tall stands on level ground and runs parallel to a tall building. if the fence is 1 ft from the building, find the length of the shortest ladder that will extend from the ground over the fence to the wall of the building. (hint #1: if L represents the length of ...

*November 17, 2011*

**calculus**

a farmer has a 2040 ft of fencing and wishes to fence off two separate fields. one of the fields is to be a rectangle with the length twise as long os the width. while the other field is to be square. determine the dimension of the fields if the farmer wishes to maximize the ...

*November 17, 2011*

**phyics**

A novice golfer on the green takes three strokes to sink the ball. The successive dis- placements are 5.9 m to the north, 10 m 45 north of east, and 5.9 m 26 west of south. Starting at the same initial point, an expert (lucky) golfer could make the hole in a single ...

*November 17, 2011*

**algebra**

Re-write with a rational exponent and simplify. ^3 sqrt:22

*November 9, 2011*

**algebra**

Find the varition constant and an equation where y varies directly as x=16 where x=8

*November 8, 2011*

**math**

find an equation of the tangent line to the curve at the given point: y=sqrt(1+x^3), (2,3)

*November 1, 2011*

**Chemistry**

Our class did an expeiment of adding sodium carbonate and calcium chloride. The experiment only yielded 28% of the calculated yield. The class did the experiment as a group (there are only 4 students in our class) and the experiment was closely supervised by our teacher to ...

*October 26, 2011*

**Chem**

64----> 32---> 16----->8 1 2 3 There are 3 half life. Divide 42/3 = 14 days

*October 19, 2011*

**Algebra**

yo momma

*October 13, 2011*

**physics**

A dog with a mass of 15kg jumps forward at 0.50m/s to catch a frisbee coming in the opposite direction at 5m/s. the dog catches the frisbee in its mouth and in doing so its velocity drops to 0.45m/s. What was the mass of the frisbee?

*October 12, 2011*

**Math Help**

yes it is, as: w^2-13w+42=0 (w-7)(w-6)=0

*October 12, 2011*

**math**

what is 33% of 61

*October 4, 2011*

**math**

5 items = a mean of 98 6 items =mean of 102 possible anwers 25,24,117,122 please show how to do

*September 29, 2011*

**accounting**

Ayres Services acquired an asset for $80 million in 2011. The asset is depreciated for financial reporting purposes over four years on a straight-line basis (no residual value). For tax purposes the asset's cost is depreciated by MACRS. The enacted tax rate is 40%. Amounts...

*September 28, 2011*

**chemistry 1025**

a shoe box measures 12.0 inches by 5.5 inches by 3.5 inches. calculate its volume in cubic centimeters.

*September 27, 2011*

**physics**

Carol is correct. I just had this problem on my online test.

*September 24, 2011*

**math**

If Jill climbed 100 feet more, how many feet above sea level would she be?

*September 9, 2011*

**Math**

10 ways to make .50 only using quarters, nickles and dimes?

*August 30, 2011*

**Math**

0.810g/mL-1.375g/mL-2.046g/mL are these numbers precise or accurate or both?

*August 30, 2011*

**Math**

3. A processor makes two components, A and B, which are then packaged together as the final product (each product sold contains one A and one B). The processor can do only one component at a time: either it can make As or it can make Bs. There is a setup time when switching ...

*August 28, 2011*

**geometry**

4x + 7 = 5x - 4

*August 25, 2011*

**Psychology**

compare and contrast the strengths and weaknesses of two different approaches to study the following issue: You have developed a new drug that you believe is effective in reducing appetite. As a result of some preliminary research, you have been given a small grant to design ...

*August 14, 2011*

**ALGEBRA**

what does the F and g mean at the beginning of any function

*August 11, 2011*

**algebra**

g(x)=10/x+7 what this things domain

*August 11, 2011*

**Math**

The formula h=48t-16t^2 gives the height, h, in feet, of an object projected into the air after t seconds. If an object is propelled upward, at what time(s) will it reach a height of 32 feet above the ground?

*July 27, 2011*

**Business**

What types of technology do people utilize to communicate? How does technology change the way people communicate? What does technology bring to communication other than the technology itself?

*July 27, 2011*

**Business Communication**

The way business communication is conducted [Passive voice] in the workplace experiences regular changes with the advances in technology that makes communication faster and easier.

*July 26, 2011*

**calculus**

this is a optimization problem A construction company has been offered a contract for $7.8 million to construct and operate a trucking route for five years to transport ore from a mine site to a smelter. The smelter is located on a major highway, and the mine is 3 km into a ...

*July 25, 2011*

**Chemistry**

Ethanol, C2H5OH or C2H6O, is mixed with gasoline and sold as gasohol. Given the following thermo-chemical reaction, calculate the kilograms (kg) of CO2 produced when enough ethanol is combusted to provide (or give off) 369 kJ of heat: C2H5OH (l) + 3 O2 (g) --> 2 CO2 (g) +3 ...

*July 12, 2011*

**physics**

Suppose 2 balls of same mass are held by 4 ropes, 2 for each ball. One ball is held by 2 ropes fastened at same height to something and the other at different heights. If the angles made by each respective pair of ropes(eg. right to right) are equal, are tensions in each ...

*June 27, 2011*

**Math**

Solve: sin2xsinx - cos2xcosx = 1, x domain [-pi, pi].

*June 16, 2011*