Wednesday
July 23, 2014

Posts by jane


Total # Posts: 1,350

Chemistry
How to find the coefficient of Fe^2+ from ClO3^- + Fe^2+ --> Cl^- + Fe^3+

Chemistry
Which has the higher [H+], 0.40 M RbOH or 0.20 M Ca(OH)2?

Statistics/Math- Please Help
When comparing two independent population means, how do I find the degree of freedoms?

Statistics
When comparing two independent population means, how do I find the degree of freedoms?

physics
what is L?

Calculus
The velocity of a car (in miles per hour) is given by v(t) = 61.25t − 17.5 t^2 where t is in hours. Write a definite integral for the distance the car travels during the first 2.5 hours. Use your graphing calculator to find this distance. Distance =

physics
A 1500-kg car is making a turn with a 100.0-m radius on a road where the coefficient of static friction is 0.70. What is the maximum speed the car can go without skidding?

physics
A propeller blade has a period of rotation of 0.400s. What is the speed of the outer tip of the propeller blade if the tip is 1.20m from the hub?

physics
i apply an 800 N force to the crate a. how long would it take the crate to travel 20m across the warehouse floor(in the direction that i am pushing it)? b. what is the magnitude and direction of the force of friction acting on the crate?

chemistry
in an element on the periodic table, which number tells you the how many electrons are in that element??

Physics
Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?

Physics
Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?

Physics
Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?

Physics
An object is released from rest. How far does it fall during the third second of its fall?

chemistry
yes, ive asked multiple people and they've all told me the same thing. i'll study the question the way you said, i have a test next week and i wanted to know how to solve problems like this,

chemistry
i already posted this question, but im still confused on it. Dinitrogentetraoxide partially decomposes according to the following equilibrium: N2O4 (g) -> 2NO2 (g) <- A 1.00-L flask is charged with 0.400 mol of N2O4. At equilibrium at 373 K, 0.0055 mol ofN2O4 remains. Ke...

Chemistry Class
I got the problem from my book, and it says the answer is 0.87?

Chemistry Class
Dinitrogentetraoxide partially decomposes according to the following equilibrium: N2O4 (g) -> 2NO2 (g) <- A 1.00-L flask is charged with 0.400 mol of N2O4. At equilibrium at 373 K, 0.0055 mol ofN2O4 remains. Keq for this reaction is ?. hOw can i set up this problem?

5th grade
*MAXIMUM 18 SO IT IS THE LAST # IN THE SET. *12 IS THE MEDIAN SO IT HAS TO BE THE MIDDLE #. IN A STRING OF 12 NUMBER, 12 WOULD HAVE TO BE THE 6 AND 7 # TO BE IN THE MIDDLE. *FOR 7 TO BE THE MODE, IT HAS TO BE A # USED MORE THAN ANY OTHER. *RANGE IS 13 WITH THE MAXIMUM 18, SUBT...

algebra
How do I figure (17 + a)^ = 2209 I know a = 30, but how do I get the answer?

physics
why does the filament of a bulb does not melt though it heats more than 3400 degree celcius

physics
A loaded dogsled has a mass of 400kg and is being pulled across a horizontal, paced snow surface at a velocity of 4.0m/s (N). Suddenly, the harness separates from the sled. If the coefficient of kinetic friction for the sled on the snow is 0.0500, how far will the sled coast b...

physics
a ball rolls off an incline at an angle of 30 below the horizontal at a velocity of 22m/s. how far from the base will the ball hit the floor if it lands in 3s?

sentence writing
hmm

psychology
Advertisers have been using the principles of classical conditioning for years in attempts to associate pleasant feelings with their products. One particular genre of ads (for beer) is particularly famous for doing so by placing scantily clothed women holding beer bottles on l...

college organic chemistry
Give the product of the substitution reactions. (CH3)2CHOSO3CH3 -> ?

chemistry
how many C atoms are in 1.50 moles of lactic acid?

chemistry
how many grams of NaOH do you need to prepare a 3.00 x 10^2 mL stock solution of 2.00 M NaOH

Physics
Free Fall: Tara throws a baseball down to Nathan. If she throws it with a speed of 2.0m/s and it lands in Nathan's hand with a speed of 10.0m/s, how far above Nathan is Tara?

Physics
Thank You.

Physics
Oh I see. What does that have to do with Galileo? I know about his objects with different masses don't determine which will fall first. Is there another concept?

Physics
It's moving 2 meters every second.

Physics
If I calculate the time, I get 1.3seconds. I assumed the ball is moving changes its velocity every 1.3 seconds?

Physics
A ball is rolling on a track with an intial velocity of 2.0m/s, E. If the acceleration is 1.5 m/s2, write a sentence that describes the ball's motion, i.e, what does the ball do each second?

College Eng 2
Im writting an argumentive paper on standardize test and I need an attention grabber.

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?

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