September 28, 2016

Posts by ann

Total # Posts: 1,419

The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.070 V exists across the membrane. The thickness of the membrane is 9.00*10-9 m. What is the magnitude of the electric...
February 3, 2007

One particle has a mass of 3.00*10-3 kg and a charge of +7.60 µC. A second particle has a mass of 6.00*10-3 kg and the same charge. The two particles are initially held in place and then released. The particles fly apart, and when the separation between them is 0.100 m, ...
February 3, 2007

Determine the number of uncompensated ions (both total number and as a percentage of the bulk ions) required to establish a charge of 100mV across a membrane of a spherical cell that is 25 ƒÊm in diameter. Assume that the total number of ions inside and outside the ...
January 30, 2007

Two identical balls each have a charge of -7.5x10^-6C. The balls hang from identical strings that are 8‹ from the vertical because of the repulsive force between the charged balls. The balls are separated by a distance of 10cm. What is the tension in one of the ...
January 29, 2007

Two charges, -37 µC and +3 µC, are fixed in place and separated by 2.8 m. (a) At what spot along a line through the charges is the net electric field zero? Locate this spot relative to the positive charge. (Hint: The spot does not necessarily lie between the two ...
January 23, 2007

Three charges are fixed to an x, y coordinate system. A charge of +12 µC is on the y axis at y = +3.0 m. A charge of -14 µC is at the origin. Lastly, a charge of +50 µC is on the x axis at x = +3.0 m. Determine the magnitude and direction of the net ...
January 23, 2007

for the current density equation (I) , solve for dV/dx when I = 0 I = - [ uz2F[C] dV/dx + uzRT d[C]/dx] According to your equation. dV/dx= uzRT/uz2[C] d[C]/dx I am uncertain what your symbols mean. It's supposed to be the current density equation I think?? My teacher also ...
January 23, 2007

Three charges are fixed to an x, y coordinate system. A charge of +12 µC is on the y axis at y = +3.0 m. A charge of -14 µC is at the origin. Lastly, a charge of +50 µC is on the x axis at x = +3.0 m. Determine the magnitude and direction of the net ...
January 21, 2007

The magnitude of the charges is |q| = 7.8 µC, and the distance between them is d = 2.7 mm. Charge 2 is attracted to charge 1, because they are opposite charges. Charge 2 is repelled from charge 3, because they are like charges. Therefore, both 21 and 23 point to the left...
January 21, 2007

The final charge on each of the three separated spheres in part (c) is +3.0 µC. How many electrons would have to be added to one of the three spheres to make it electrically neutral? Divide 3*10^-6 Coulombs by 1.6*10^-19 Coulombs per electron. The will be the number of ...
January 21, 2007

a truck uses 8L of gas to go 120 kkkm. how much gas does it use to go 300km? 8 * 300/120 = 20 I'm assuming "kkkm" was a typo could you do it like 8/120*300? To think of it logically, the proportions remain the same. 8/120 = X/300 Then X = 8/120 * 300 I hope this ...
December 19, 2006

7150/(33.5e4) = g ice doesn't work. Am I calculating incorrectly? heat of fusion for water is 334 J/g. You want it in J/g since q is given in the problem in J. The answer will be in units of grams of ice. You will need to change to kg since the problem asks for it in kg. ...
December 12, 2006

could you tell me three equivalent fractions for each: 2/3 8/16 4/10 3/4 Just multiply or divide by a common number. For example, 2/3 = 4/6 = 6/9 = 8/12 = 10/15 8/16 = 4/8 = 1/2 etc. Just multiply each fraction by 3 different numbers. For example 2/3...multiply it by 2 to get ...
November 28, 2006

I am having trouble finding charcteristics of orientalism. There is nothing in my reading about orientalism and I just need a little help getting started. search orientalism in the search window above.
November 9, 2006

It is a proof. Given: line DB bisects line AC line AD is parallel to line BE AD=BE Prove: DB=EC there are two triangles connected together by point B. They are labled A D B and B E C. D and E are the top points of the triangles. they look like they would be right angle ...
October 8, 2006

orientalism of muslim and arab american
Ahh axia is diffucult they do just leasve you hanging. Amnd if you ask the wrong questions you then get riduculed for asking thanks for the help this is a great site
August 6, 2006

Can anyone help with this question? Describe three types of evidence that scientists used to develop the three doamin system? Refer to for more than three types of evidence. One is differences in 16S rRNA genes of the three ...
August 4, 2006

Eth 125 cultural diversity
what differentiates the act of grouping people from the act of stereotyping?how can stereotyping affect group relations?give an example of a stereotype you find in everyday life
July 20, 2006

Inclusive Language Talking about People with Disab
Her brother’s friend is an AIDS victim. in rewriting this sentence so it would not be Talking about People with Disabilities and Diseases. would I just say her brother's friend is a victim and leave out the word aids. I think it would be better to say something like ...
July 11, 2006

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