Friday
April 18, 2014

Posts by robert


Total # Posts: 772

math
Which number property shows that the two sides of the equation are equal? 841 + 841(37) + 841(623) = 841 + 841(37 + 623)

Physics - Electromagnetism
thank you Elena!

Physics - Electromagnetism
This is the last question for a final exam preparation sheet and I can't figure out the answer. Any help would be greatly appreciated. Thank you. - One very long wire carries current 10.0 A to the left along the x axis. A second very long wire carries current 75.0 A to the...

Chemistry
I had an equilibrium laboratory and had to answer a few questions after the lab. Here are 2 questions I can't seem to know how to answer. 1. Explain in your own words why a saturated solution in contact with some undissolved solid is considered to be an equilibrium situati...

Art Appreciation
Explain how Florence reflects the ideals of the dominant city-state and how some of the geographical, economical, social, and artistic forces shape this ideal. Use one example from Gardner’s Art through the Ages and one example from the Internet.

Chemistry
Is ClO2>- a Bronsted acid, base, or both?

Chemistry - Correction
Thanks Bob!

Chemistry - Correction
I just wanted to be sure if my answers make any sense. Thank you; For the reaction of ammonia: N2(g) + 3H2(g) --> 2NH3(g) suppose equilibrium has been established. Explain how and why the position of equilibrium will shift in response to the following changes: (a) Addition...

Chemistry
I just wanted to be sure if my answers make any sense. Thank you; For the reaction of ammonia: N2(g) + 3H2(g) --> 2NH3(g) suppose equilibrium has been established. Explain how and why the position of equilibrium will shift in response to the following changes: (a) Additiona...

Chemistry 2
Chlorine atoms contribute to the destruction of the earth's ozone layer by the following sequence of reactions: Cl + O3 --> ClO + O2 ClO + O --> Cl + O2 Where the O atoms in the second step come from the decomposition of ozone by sunlight: O3 --> O + O2 What is th...

Chemistry
Thank you Bob

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 experime...

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?

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

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

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 vert...

Chemistry
I see, thanks a lot Bob!

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 fi...

Chemistry
I get it now, thanks again Bob

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

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

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

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 ...

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?

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 t...

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 tempera...

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

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...

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!

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

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 th...

Ashford
Employee motivation

Chemistry
thanks!

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 eq...

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 wi...

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

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?

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

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

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.

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

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

Economics
C

English 11
please help 1 is right.

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 tri...

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?

math
33inches

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?

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?

College Math
m=4

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.

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 ...

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 ...

math
3x^3/(3x)^3

ALGEBRA 2
T=I divided by PR

Algebra 1
(2p/9)exponent of 3

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

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 poe...

English
Can someone please check my answers?

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?

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?

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?

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.

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 Si...

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 (...

english 9
which paragraph of the article best supports the authors argument against clear cutting?

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

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. A...

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. A...

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

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

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

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

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

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)?

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 vi...

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

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.

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 ...

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 th...

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 t...

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 ...

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

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

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

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 ens...

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

Algebra
yo momma

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?

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

math
what is 33% of 61

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

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...

chemistry 1025
a shoe box measures 12.0 inches by 5.5 inches by 3.5 inches. calculate its volume in cubic centimeters.

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

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

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

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

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 fr...

geometry
4x + 7 = 5x - 4

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