Friday

July 25, 2014

July 25, 2014

Total # Posts: 46

**Math**

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

**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.

**chemistry**

what is the molal concentration of tin in a solution of 5.000g of tin dissolved in 95.00 g of copper?

**chemistry**

What is the mole ratio between all compounds of this reaction:HC2H3O2 + NaHCO3 = NaC2H3O2 + H2O + CO2

**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.

**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.

**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.

**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...

**chemistry**

How many grams of CuSO4 are there in 219 grams of an aqueous solution that is 20.2% by weight CuSO4

**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?

**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 rolle...

**Physics**

Ohh I see! Thanks a lot!

**Physics**

and the "i" looking thing is the coefficient of friction

**Physics**

im sorry it should be cos theta for all of them

**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?

**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 for...

**Physics**

yeahh

**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.

**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.

**Physics**

okay, just making sure

**Physics**

thus you assume Fgx' is mgcos20 and Fgy' is mgsin 20?

**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.

**Physics**

same for Fgx'=uS(Fgy'-P)

**Physics**

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

**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,...

**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 i...

**Science**

An object that floats in water has ___________ in water?

**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 ...

**Organic Chemistry Lab**

Thanks sooo much!!!

**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.

**Organic Chemistry Lab**

How do we correct the problem if during TLC development the solvent ran off the plate?

**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 va...

**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 valu...

**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 maxi...

**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?

**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.

**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?

**english**

what tense is the verb in the following sentence? What are you wearing to school tomorrow?

**english**

What is the verb tense for the following sentence? Where are you going after school today?

**english**

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

**algebra**

[3-7(1-8)] parentheses first 1-8= -7 -7*-7= 49 3-49= -46 am I correct?

**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...

**science**

How do you seperate a mixture of iron and sulphur by means of a phsyical test without using a method

**science**

How do you diffirentiate between a sample of iron and a sample of iron sulfur by means of a chemical test

**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.

**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 ...

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