Thursday
November 27, 2014

Posts by jeanne


Total # Posts: 47

physics
The coldest and hottest temperatures ever recorded in the United States are -83°F and 135°F, respectively. What is the speed of sound in air at each temperature?
November 6, 2014

Math
A rubber ball is dropped from height h. It bounces 27" (60%). Write an equation you can use to find height h
January 29, 2014

Physics
A simple pendulum consists of a ball connected to one end of a thin brass wire. The period of the pendulum is 1.45 s. The temperature rises by 142 C°, and the length of the wire increases. Determine the change in the period of the heated pendulum.
July 30, 2013

chemistry
what is the molal concentration of tin in a solution of 5.000g of tin dissolved in 95.00 g of copper?
April 30, 2013

chemistry
What is the mole ratio between all compounds of this reaction:HC2H3O2 + NaHCO3 = NaC2H3O2 + H2O + CO2
March 3, 2013

math/algebra
the length of a rectangular frame is 5 cm more than the width. the area inside the frame is 66 square cm. find the width of the frame.
December 9, 2012

algebra/math
the length of a rectangular flower bed is 7 feet less than 3 times its width. the area of the bed is 20 feet squared. find the dimensions of the flower bed.
December 9, 2012

sceince
The concentration of hydroxide ions in the antacid, milk of magnesia, is 5.2x10^-4 M. Calculate the concentration of hydronium ions at 25 degrees celcius.
December 5, 2012

statistics
8. Compare the mean for the heights of males and the mean for the heights of females in these data. Compare the values and explain what can be concluded based on the numbers. Comparing the mean of height between male and female shows that the average height of a female in this...
May 12, 2012

chemistry
How many grams of CuSO4 are there in 219 grams of an aqueous solution that is 20.2% by weight CuSO4
April 13, 2012

math
Mr. Garcia is going to pain a mural on one wall. There is a rectangular shaped window that is 24 in. wide and 36 in. high on the wall. How many square feet of the wall will be painted?
January 25, 2012

Physics
In this problem, use g = 9.80 m/s2. Bizarro, located at Six Flags New England, in Agawam, MA, is the name of one of the top-rated roller coasters in the country. The first drop on the roller coaster brings you down 67 meters. There are some resistive forces acting as the ...
October 30, 2011

Physics
Ohh I see! Thanks a lot!
October 30, 2011

Physics
and the "i" looking thing is the coefficient of friction
October 30, 2011

Physics
im sorry it should be cos theta for all of them
October 30, 2011

Physics
I know the work done is W = ì X mgcosè X d and W is Ui+ W= Kf which is 54-(25*3.3)=-33.5 so W = ì X mgcosè X d and so ì= (W/(mgcosè X d)) and mg=25N so what is cosè? and i think d is the hypotenuse?
October 30, 2011

Physics
A box, with a weight of mg = 25 N, is placed at the top of a ramp and released from rest. The ramp measures 4.40 meters horizontally and 3.50 meters vertically. The box accelerates down the incline, attaining a kinetic energy at the bottom of the ramp of 54.0 J. There is a ...
October 30, 2011

Physics
yeahh
October 10, 2011

Physics
Yes, your equation is right so if you just plug in your given numbers for P=mgcos20-(mgsin20/uS) you should get the correct answer.
October 10, 2011

Physics
I am trying your equation from for P. I have a feeling it will come out as a negative force and if you apply a perpendicular force it will only increase the contact force and thus not move the box, but let me see.
October 10, 2011

Physics
okay, just making sure
October 10, 2011

Physics
thus you assume Fgx' is mgcos20 and Fgy' is mgsin 20?
October 10, 2011

Physics
Yeah I got that, but I was hoping you could explain what you defined as the x' and y' component of each like in terms of cos and sin seeing that we might not be on the same page so i cant check ur answers exactly if i use something different.
October 10, 2011

Physics
same for Fgx'=uS(Fgy'-P)
October 10, 2011

Physics
Can you explain what Hx'+Fgx'=uS(Fgy'-Hy') means? It's hard to elaborate when the variables aren't defined.
October 10, 2011

Physics
A box with a mass of 7.00 kg is at rest on a ramp that is at an angle of 20 degrees with the horizontal. The coefficient of static friction between the box and the ramp is 0.800. Use g = 9.80 m/s2. You now want to make the box move by applying a force. To start the box moving...
October 10, 2011

Physics
Two boxes on a horizontal surface, as shown in the figure above, are moving together under the influence of a horizontal force, F. The coefficient of kinetic friction between the boxes and the surface is 0.40. Use g = 10 m/s2. In case (a), a horizontal force F directed right ...
October 10, 2011

Science
An object that floats in water has ___________ in water?
September 4, 2011

Organic Chemistry Lab
Hi! For an orgo lab we had to isolate the following from milk powder and now I have to calculate the percentage yield, but first I need the theoretical yield. Can someone help me on the following? I need to know how of each there is in milk and I can do further calculation of ...
April 8, 2011

Organic Chemistry Lab
Thanks sooo much!!!
November 8, 2010

Organic Chemistry Lab
A sample of hexane and octane is injected into a gas chromatograph equipped with a nonpolar column. Predict which one will have the shorter retention time.
November 8, 2010

Organic Chemistry Lab
How do we correct the problem if during TLC development the solvent ran off the plate?
October 21, 2010

Organic Chemistry Lab
For the "ISOLATION OF CHLOROPHYLL AND CAROTENOID PIGMENTS FROM SPINACH" Lab we have to think about how we can correct the following if they were to occur: - A two component mixture containing dicarboxylic acid and a tricarboxylic acid gave only one spot with an Rf ...
October 21, 2010

Organic Chemistry Lab
For the "ISOLATION OF CHLOROPHYLL AND CAROTENOID PIGMENTS FROM SPINACH" Lab we have to think about how we can correct the following if they were to occur: a.) When a two-component mixture containing 1-ocetone and 1,4-dimethylbenzene gave only one spot with an Rf ...
October 21, 2010

algebra 2
Rosalyn works no more than 16 hours a week during the school year. she is paid $10 and hour for tutoring geometry students and $7 an hour for delivering pizzas for Pizza King. She wants to spend at least 6 hours but no more than 8 hours a week tutoring. Find Rosalyn's ...
October 14, 2010

Math
A 9 percent salt-water solution is mixed with 4 ounces of an 18 percent salt-water solution in order to obtain a 15 percent salt-water solution. How much of the first solution should be used?
September 1, 2010

Math
How many ways are there to choose a three-digit lottery number? Note that numbers like 003, 014, 222, 232 or 123 are all allowed.
August 17, 2010

english
I believe it would be future, I am not a hundred percent on that because it doesn't have the word "will" in the sentence however it is talking about something that will happen in the future. Is that correct?
November 22, 2009

english
what tense is the verb in the following sentence? What are you wearing to school tomorrow?
November 22, 2009

english
What is the verb tense for the following sentence? Where are you going after school today?
November 22, 2009

english
In the following sentence, what is the verb and what tense is the verb? What will you do after graduation?
November 22, 2009

algebra
[3-7(1-8)] parentheses first 1-8= -7 -7*-7= 49 3-49= -46 am I correct?
November 20, 2009

10th grade Chemistry
Hi there Please please help me. I'm a mom trying to find the answer for my child. Do not have intenet at home and have been to the library for 3 hours and one th internet at work for 5 hours and still cannot find an answer. I stumbled across the website by luck (aren't...
February 11, 2009

science
How do you seperate a mixture of iron and sulphur by means of a phsyical test without using a method
February 11, 2009

science
How do you diffirentiate between a sample of iron and a sample of iron sulfur by means of a chemical test
February 11, 2009

Math
You and Bruce Willis are upright in a natatorium of liquid with containers of 5.3 gallons and 3.75. You need exactly 4 1/2 gallons of liquid to create a certain solution. How can you assure that you have exactly that amount? Show your work.
April 2, 2007

U.S. Preamble
I am doing a extra credit project for social studies. Does anyone have any ideas for the project for the preamble of the u.s. constitution. I need to be able to do it in 1 week Let's look at the Preamble -- "We the People of the United States, in Order to form a more ...
October 20, 2006

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