Wednesday
April 16, 2014

Posts by jane


Total # Posts: 1,315

Chemistry
2N2O(g) → 2N2(g) + O2(g) d[N2O]/dt = -5.8×10-4 M/s at a particular temperature and set of concentrations. What are d[O2]/dt and d[N2]/dt? d[O2]/dt = d[N2]/dt = What is the rate of the reaction? my answer for the first one im getting -.00016 and the second one 2.9e-...

DrBob222
2N2O(g) → 2N2(g) + O2(g) d[N2O]/dt = -5.8×10-4 M/s at a particular temperature and set of concentrations. What are d[O2]/dt and d[N2]/dt? d[O2]/dt = d[N2]/dt = What is the rate of the reaction? my answer for the first one im getting -.00016 and the second one 2.9e-...

geography
name at least 5 bodies of water ? what are they thank you

Math homework
oh... 3-(-4+8)=3-[-4+(-8)] 3-(-12) 3+12 15=3-[-4+(-8)] 15=3+12 15=15

Math homework
what are you solving for?

Math homework
3-8+3-8+2 =-5+3-8+2 =-2-8+2 =-10+2 =-8

social studies
It was an attempt to prevent colonial tensions with Native Americans by establishing the western boundaries of the 13 coastal colonies.

CHEM
It is an alloy of copper and zinc, therefore it is a mixture, since a compound is chemically formed while an alloy is just a dissolving of one metal in another.

phsyics
A baseball is thrown straight up. The drag force is proportional to v^2. In terms of g, what is the y-component of the ball's acceleration when its speed is half its terminal speed and it is moving up? In terms of g, what is the y-component of the ball's acceleration w...

Chemistry
Why would it be better to titrate a solution rather than just dilute it?

University Research-level Biology
Hello, this is an upper-level question, and I would sincerely appreciate help before Tuesday. I am reading a journal article, and there is one conclusion in it that I do not understand. It predicts a postsynaptic mechanism when EPSP amplitudes do not vary across trials, and a ...

math
expand 9x - 36 + x = 10x - 40 + 4 put like terms on the same side 9x + x - 10x = 36 - 40 + 4 simplify 0=0 Well your question doesn't make sense.

English
6) We have afternoon classes on Tuesdays from 2pm to 4pm. 7) I prefer scientific subjects such as physics and maths to humanities. 8) We are tested orally twice a term and we get three written marks each term (is there a better way of expressing it??). 9) A calendar and an at...

Math
Hello everybody

physics
At a picnic, there is a contest in which hoses are used to shoot water at a beach ball from three directions. As a result, three forces act on the ball, F1, F2, and F3 (see drawing). The magitudes of 1 and 2 are F1 = 55.0 newtons and F2 = 95.0 newtons. Using a scale drawing an...

physics
They will hit the ground at the same time. the accelerate at the same rate of 9.8m/s^2

Math
2x cubed minus x squared minus 6x plus 3. I know the answer is (2x-1)(x squared-3). Please help me with how they got that answer. Thank you!

Math
2x cubed minus x squared minus 6x plus 3. I know the answer is (2x-1)(x squared-3). Please help me with how they got that answer. Thank you!

s.s.
Spain and Portugal

Geography
Why is Cairo an important city?

9th grade math
Correct. 3/4 times 3/4 equals 9/16

Geography
THanks

Geography
Why is rice important to the Middle East?

chemistry
If a soda can is 11.8 cm tall, how many would it take to make a stack to reach the moon?

calculus
PLEASE write 2x+y=5 in polar form. a. -sqrt5 = r cos (theta -27degrees) b. sqrt5 = r cos (theta -27degrees) c. -sqrt5 = r cos (theta +27degrees) d. sqrt5 = r cos (theta +27degrees) is the answer c.

Health, Safety, and Nutrition
a or d

health
prefix of osterperosis

math
=8-2[3-(15x+5)] =8-2[-15x-2] =8+30x+4 =30x+12

Finance
I have this same problem. I just cannot figure out if the labor content is needed to calculate the NPV. Any ideas?

math116
I need help with 3(x-1)+5=15x +7-4-4(3x+1)+ 3

Math
An equilateral triangle is one in with all three sides are length. If two vertices of an equilateral trangle (0,4) and (0,0), find the third vertex. How mant of these triangles are possible? How would you slove this??

calculus
Thanks I see where I made the mistake Thank you!

calculus
The total area enclosed by the graphs of y=10x^2–x^3+x y=x^2+19x This is a really long problem I keep getting the answer of 20.25 but it is incorrect I dont know where I am going wrong?

finance
Leggio Corporation issued 20-year, 7% annual coupon bonds at their par value of $1,000 one year ago. Today, the market interest rate on these bonds has dropped to 6%. What is the new price of the bonds, given that they now have 19 years to maturity

American History
What two colonies were resistant towards slavery?

Chemistry
If a diagram describes an initial state of the reaction A2 + B2 --> 2AB. Would the picture with more AB products represent the result at the higher temperature?

Chemsitry
I don’t understand how to write this equation. Write an equation relating the concentration for a reactant A at t=0 to that at t=t for a first-order reaction. Define all the terms, and give their units. Do the same for a second- order reaction. -Would it be the rate law e...

Chemistry
How would you solve this problem? C4H8(g)--> 2C2H4 Determine the order of the reaction and the rate constant based on the following pressures, which were recorded when the reaction was carried out 430 C in a constant volume vessel. Time (s) P(C4H8)(mmHg) 0 400 2,000 316 4,0...

other
why do u say d??

other
some child psychologists have concluded that___ is the strongest predictor of both scholastic and career achievement A. physical illness b. respect for authority c. emotional well being d inherited intelligence

other
Encouraging children to eat certain foods their families enjoy aroud the holidays is an example of?

College Physics
An airplane flies 200 km due west from city A to city B and then 240 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?

chemistry
A silver ring contains 0.0134 mmol Ag. How many silver atoms does it contain?

chemistry
A silver ring contains 0.0134 mmol Ag. How many silver atoms does it contain?

English
8. We enjoyed some entertaining numbers on the program.

Math
what is .50 times 95000 lbs?

chemistry
Why moles?

chemistry
A chemical problem may be presented to you in units of moles, mass, or volume. Which one of these can be directly used in arithmetic no matter what the conditions are?

marketing
You are working in the product development department of a company that creates household products. Your team has come up with an idea for a revolutionary new cleaning product. Using the seven phases of new product development as a guide, describe how your company will develop...

Stats
A participant in a cognitive psychology study is given 50 words to remember and later asked to recall as many as he can of them. This participant recalls 17. What is the (a) variable, (b) possible values, and (c) score? I just don't understand what it all means. I've r...

chemistry
contrast ionic and molecular substances in terms of the types of attractive forces that govern their behavior

English
I can't send you my homework. What shall I do?

Bus.
P $26 X Q 14 = $ 364 - Cost $238 = $126 , Which is max Profit among those.

How Children learn
what kind of responses do behaviorists look for in their students?

algebra
find the LCM of (7 4z), (49-16zsquared), and (7-4z)

math
is the answer 2/25

math
you roll a fair number cube twice. what is the probability of rolling two 3's if the first roll is 5

math
is the answer 1/657800

math
a sock drawer contains 10 white socks, 6 black socks, and 8 blue socks. if 2 socks are chosen at random, what is the probability of getting a pair of white socks?

physics
2m/s

physics
A spherical convex mirror has a radius of curvature of magnitude of 20cm. At what distance from the mirror should an object be placed to obtain an image that is virtual, four times smaller and upright.

lal
how to say FUN in a PLURAL way my sentence is fundraising is the easiest and (fun) way in school

math
Solve for x: (4x + 1)1/2 = 3

Math
$20768 the percentage for this is 21% please help me through the formula on how this is done get 21%

math
how do do you find the percentage of $38676?

quote
what does this mean? " when you judge another you do not define them ,you define yourself."

quote
what does this quote mean? " the surest way to corrupt the youth is to instruct him to hold in higher esteem those who think alike , then those who thinks differently"

singular/plural
is it right!?

singular/plural
sara looked happy going to school, but it was odd because she hated school. maybe it had do with BOY CRUSHES

singular/plural
my entire snetence is this : sara looked happy going to school, but it was odd becuz she hated school. maybe it had to do with boy crushes

singular/plural
i want to say this word in a plural way is this the correct way boy crushes or boys crushes

math
how do you find the area of a square

Calculus
If f(x)= 3 + |x-2|, then f'(2) is A. -1 B. 1 C. 2 D. 3 E. nonexistent

math
Mrs Munoz algebra class was collecting money for a party. The class decided that each student should give the same amount of money. They collected a total of $9.61. If everyone used 5 coins, how many nickels were collected?

English
Can you please tell me which of the two is better? a polka-dotted T-shirt or a polka-dot T-shirt?

English
I just want to know if I can send you my homework.

math
is this correct? 1.a jar contains 5 white, 15 violet,and 21 blue marbles. a marble is drawn at random. P(violet or white) answer: 5x15x21= 1575 15x5=75 75/1575= 1/21 2. a number from 10 to 16 is drawn at random. P(a number greater than 14) answer: 2/7

math/probability
find the number of possible choices when you choose one item from each category. 1. 3 hats, 7 shirts, 13 scarves 2. 6 pens, 2 nbk 3. 4 cars, 2 colors i dont get the question

CHEMISTRY
is it reasonable to expect the heat of neutralization to be the same regardless of which acid is used? or should we expect each acid and base combination to have its own heat of neutralization?

Chemistry
In the neutralization of HCl and NaOH i was instructed to measure the temperature of the acid HCl prior to mixing the reaction components. I was to assume however, that the NaOH solution was at this same temperature. Is this a reasonable assumption?

biomechanics
If a kicker produces a torque of 8Nm with her muscles and the resulting angular acceleration of her leg is 20rad/m2, what is the moment of inertia of her leg?

Chemistry
Well, I know that the reaction is endothermic, because delta Hº is also positive. I just don't understand why delta G is positive, since the reaction seems to be spontaneous...

Chemistry
If delta G for the dissociation of Borax at 30 degrees C (higher than room temperature) is positive, why does it dissolve at room temperature?

health
Help!! I am doing an assignment with 3 scenarios and I have got the first 2 but having trouble with the last. I have read through my chapter and searched webmd and other sites and still can't figure it out. Richard has noted over the past several weeks that he is having mo...

Math
The slope intercept is 1/3 and the y intercept is 4xsquaredk. What is the slope intercept form.

10th grade
The slope intercept is 1/3 and the y intercept is 4xsquaredk. What is the slope intercept form.

Trig Math
I need help with this problem. I don't get how to do it or how they got that answer. A force of 50 pounds acts on an object at an angle of 45 degrees. A second force of 75 pounds acts on the object at an angle of -30 degrees. What was the direction and the magnitude of the...

Physics
The smallest object visible to the unaided eye is of 100 microns. If you use a microscope of m=1000, what is the size of the smallest object you can now see? (So=25cm) The answer is apparently 100nm. I am still confused as to why. Please help!

world history
why are farmers today not as tightly bound by geography and climate as they were in the past

space
uummm i want to know how can telescope cxan see so far????

inorganic chemistry
In the final step of making the nitro complex it involves the addtion of concentrated HCl. What are the role(s) of the HCl in this step of the synthesis? nitro complex: [Co(NH3)5(NO2)]Cl2

Physics
A mass spectrometer is used to separate isotopes. If the bean emerges with a speed of 374 km/s and the magnetic field in the mass selector is 1.5 T, what is the distance between the collectors for 235U+1 and 238U+1? The mass of 235U+1 is 235 u and the mass of 238U+1 is 238 u, ...

physics
Two horizontal parallel wires which carry currents I1 = 45 A (top)and I2 (bottom). The top wire is held in position, the bottom wire is prevented from moving sideways but can slide up and down without friction. If the wires have a mass of 9.2 g per metre of length, calculate c...

Math
What is 38 tmes 93 divided by 3 minus 4

Physics
Nevermind I figured it out thanks.

Physics
I am still confused as to which direction the wires will rotate. Using the right hand rule, I found that the magnetic field of both wires will rotate counterclockwise (if you look from above and from the left side).

Physics
Two current carrying wires cross at right angles (like a + sign). Wire 1 has current directed horizontally to the left. Wire 2 has current directed vertically up. If the wires are not restrained, what statement best describes the motion of the wires? A) Wire 1 moves out of the...

algebra
How do you solve the expotential notation equation 120-6^2/4x8?

Physics
We compare a silicon chip to a nerve membrane, with silicon having (about) twice the dielectric constant of the nerve membrane. Which of the following statements is true? A) 1cm^2 silicon chip has a higher capacitance than 1cm^2 nerve membrane. B) 1cm^2 silicon has the same ca...

PHYSICS
The frequency of an ambulance siren is 700 Hz. If a pedestrian on the side of the road hears the siren at 756 Hz approximately how fast and in what direction is the ambulance moving? The answer is 90 km/h and towards the person..im not sure how to come to this answer though......

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