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September 21, 2014

Posts by jane


Total # Posts: 1,358

arithmetic
a recipe for rice pudding uses 1/2 cup of rice and serves 6 people. write the cups of rice per person as a unit rate . how many cups of rice do you need to serve 75 people?
November 29, 2010

Chemistry
The following isotopes (listed with their half-lives) have been used in the medical and biological sciences. Arrange these isotopes greatest to least decay activity. (Use the appropriate <, =, or > symbol to separate substances in the list.) ^3H (12.2 years) ^24Na (15 ...
November 27, 2010

Chemistry
How did you get N?
November 27, 2010

Chemistry
Each of the following nuclides is known to undergo radioactive decay by production of a beta particle, ^0_-1e. Write a balanced nuclear equation for each process. (Use 'e' for an electron, 'p' for a positron, and 'n' for a neutron. Omit states-of-matter...
November 27, 2010

physics
A 50.0 kg girl bounces up and down on a pogo stick. The girl has an instantaneous acceleration of 2.0 m/s^2 when the displacement is -8.0cm. What is the spring constant of the pogo sticks spring?
November 24, 2010

physics
Find the length of a pendulum that has a frequency of 0.80 Hz?
November 24, 2010

physics
A 0.025 kg object vibrates in SHM at the end of a spring. If the maximum displacement of the object is 0.030 cm, and its period is 0.50s, what is the maximum acceleration of the object?
November 24, 2010

physics
A 0.11kg mass is vibrating at the end of a horizontal spring along a frictionless surface. If the spring constant is 0.52 N/m, what is the displacement of the mass when the acceleration of the mass is 0.25m/s^2?
November 24, 2010

physics
A man is pulling on a rope with a force of 53 N directed at an angle of 70◦ to the horizontal. What is the x-component of this force? Answer in units of N.
November 22, 2010

algebra
Convert to a logarithmic equation: 9y = 6561
November 21, 2010

CHEMISTRY
For the reaction 3 O2(g) reverse reaction arrow 2 O3(g) If the equilibrium mixture is analyzed and [O2(g)] is found to be 3.77*10-2 M, what is the concentration of O3(g) in the mixture?
November 21, 2010

Chemistry
How to find the coefficient of Fe^2+ from ClO3^- + Fe^2+ --> Cl^- + Fe^3+
November 21, 2010

Chemistry
Which has the higher [H+], 0.40 M RbOH or 0.20 M Ca(OH)2?
November 20, 2010

Statistics/Math- Please Help
When comparing two independent population means, how do I find the degree of freedoms?
November 15, 2010

Statistics
When comparing two independent population means, how do I find the degree of freedoms?
November 15, 2010

physics
what is L?
November 15, 2010

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 =
November 14, 2010

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?
November 7, 2010

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?
November 7, 2010

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?
November 5, 2010

chemistry
in an element on the periodic table, which number tells you the how many electrons are in that element??
November 4, 2010

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?
November 1, 2010

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?
November 1, 2010

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?
November 1, 2010

Physics
An object is released from rest. How far does it fall during the third second of its fall?
October 26, 2010

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,
October 26, 2010

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. ...
October 26, 2010

Chemistry Class
I got the problem from my book, and it says the answer is 0.87?
October 25, 2010

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?
October 25, 2010

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, ...
October 25, 2010

algebra
How do I figure (17 + a)^ = 2209 I know a = 30, but how do I get the answer?
October 22, 2010

physics
why does the filament of a bulb does not melt though it heats more than 3400 degree celcius
October 22, 2010

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 ...
October 22, 2010

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?
October 14, 2010

sentence writing
hmm
October 14, 2010

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 ...
October 13, 2010

college organic chemistry
Give the product of the substitution reactions. (CH3)2CHOSO3CH3 -> ?
October 13, 2010

chemistry
how many C atoms are in 1.50 moles of lactic acid?
October 10, 2010

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
October 7, 2010

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?
October 5, 2010

Physics
Thank You.
September 30, 2010

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?
September 30, 2010

Physics
It's moving 2 meters every second.
September 30, 2010

Physics
If I calculate the time, I get 1.3seconds. I assumed the ball is moving changes its velocity every 1.3 seconds?
September 30, 2010

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?
September 30, 2010

College Eng 2
Im writting an argumentive paper on standardize test and I need an attention grabber.
September 30, 2010

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-...
September 29, 2010

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-...
September 29, 2010

geography
name at least 5 bodies of water ? what are they thank you
September 29, 2010

Math homework
oh... 3-(-4+8)=3-[-4+(-8)] 3-(-12) 3+12 15=3-[-4+(-8)] 15=3+12 15=15
September 27, 2010

Math homework
what are you solving for?
September 27, 2010

Math homework
3-8+3-8+2 =-5+3-8+2 =-2-8+2 =-10+2 =-8
September 27, 2010

social studies
It was an attempt to prevent colonial tensions with Native Americans by establishing the western boundaries of the 13 coastal colonies.
September 27, 2010

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.
September 25, 2010

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 ...
September 23, 2010

Chemistry
Why would it be better to titrate a solution rather than just dilute it?
September 21, 2010

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 ...
September 20, 2010

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.
September 20, 2010

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 ...
September 19, 2010

Math
Hello everybody
September 19, 2010

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 ...
September 12, 2010

physics
They will hit the ground at the same time. the accelerate at the same rate of 9.8m/s^2
September 10, 2010

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!
September 9, 2010

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!
September 9, 2010

s.s.
Spain and Portugal
September 9, 2010

Geography
Why is Cairo an important city?
September 9, 2010

9th grade math
Correct. 3/4 times 3/4 equals 9/16
September 9, 2010

Geography
THanks
September 9, 2010

Geography
Why is rice important to the Middle East?
September 9, 2010

chemistry
If a soda can is 11.8 cm tall, how many would it take to make a stack to reach the moon?
September 6, 2010

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.
September 6, 2010

Health, Safety, and Nutrition
a or d
September 5, 2010

health
prefix of osterperosis
September 3, 2010

math
=8-2[3-(15x+5)] =8-2[-15x-2] =8+30x+4 =30x+12
September 2, 2010

Finance
I have this same problem. I just cannot figure out if the labor content is needed to calculate the NPV. Any ideas?
August 31, 2010

math116
I need help with 3(x-1)+5=15x +7-4-4(3x+1)+ 3
August 31, 2010

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??
August 26, 2010

calculus
Thanks I see where I made the mistake Thank you!
August 17, 2010

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?
August 17, 2010

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
August 8, 2010

American History
What two colonies were resistant towards slavery?
July 31, 2010

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?
July 17, 2010

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 ...
July 17, 2010

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,...
July 17, 2010

other
why do u say d??
July 15, 2010

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
July 14, 2010

other
Encouraging children to eat certain foods their families enjoy aroud the holidays is an example of?
July 13, 2010

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?
July 5, 2010

chemistry
A silver ring contains 0.0134 mmol Ag. How many silver atoms does it contain?
July 2, 2010

chemistry
A silver ring contains 0.0134 mmol Ag. How many silver atoms does it contain?
July 2, 2010

English
8. We enjoyed some entertaining numbers on the program.
June 30, 2010

Math
what is .50 times 95000 lbs?
June 15, 2010

chemistry
Why moles?
June 13, 2010

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?
June 13, 2010

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...
June 7, 2010

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 ...
May 28, 2010

chemistry
contrast ionic and molecular substances in terms of the types of attractive forces that govern their behavior
May 23, 2010

English
I can't send you my homework. What shall I do?
May 19, 2010

Bus.
P $26 X Q 14 = $ 364 - Cost $238 = $126 , Which is max Profit among those.
May 18, 2010

How Children learn
what kind of responses do behaviorists look for in their students?
May 13, 2010

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