Wednesday

March 4, 2015

March 4, 2015

Total # Posts: 1,214

**College Physics**

Use the relativistic coordinate transformation (x, y, z, t) − (x′, y′, z′, t′) shown and given below where the latter frame S′, (x′, y′, z′, t′), has a velocity 2.69813 × 108 m/s in the positive direction ...
*April 14, 2010*

**College Physics**

delta wavelength=.00243(1-cos theta)
*April 13, 2010*

**College Physics**

An x-ray photon collides head-on with an electron and is scattered directly back at 160◦ to its original direction. What is the shift in the wavelength of the incident x-ray? do i need to figure out the "compton shift" in order to solve..can someone please show...
*April 13, 2010*

**College Physics**

thank you very, i did the calculations and it was simple math after your explanation.. i got answer as 17.36 MeV =]
*April 13, 2010*

**College Physics**

A gamma ray (a high-energy photon of light) can produce a particle- antiparticle pair, each particle with mass 8.68 MeV/c2 when it enters the electric field of a heavy nucleus: γ ! λ+ + λ− . What minimum γ-ray energy is required to accomplish this ...
*April 13, 2010*

**Science-Biochemistry**

What was the alcohol percent by weight in your sample with the most gas production (glucose; which gave 30 mL of CO2)? Remember that the temperature was 40 degrees C and assume the atmospheric pressure was 101.3 kPa.
*April 13, 2010*

**Physics**

Thank you so much! I wasn't understanding the format.
*March 22, 2010*

**Physics**

The displacement of an object in SHM is given by y(t) = (7.1 cm)sin[(1.64 rad/s)t]. What is the frequency of the oscillations in Hz? I'm completely stuck here. I was thinking that frequency = 1/t. I'm stuck with the information given. Please help!
*March 22, 2010*

**Physics**

A 0.56-kg mass is suspended from a string, forming a pendulum. The period of this pendulum is 3.6 s when the amplitude is 2.2 cm. The mass of the pendulum is now reduced to 0.27 kg. What is the period of oscillation now, when the amplitude is 2.5 cm? Give answer in seconds. I ...
*March 22, 2010*

**keyboarding and word processing**

1.Secretary A will use “Sincerely” as the complimentary closing of a letter to a colleague. Secretary B will use “Cordially” as the complimentary closing of a letter to a friend. Which secretary is using the correct closing A. Only secretary A C. Both ...
*March 11, 2010*

**math **

I have a question about sets. If you have uppercase letters and lower case letters and they question is asking are these equal or equivalent or neither. I believe it would be equivalent because they are the same but different. Please help thanks
*March 3, 2010*

**physics**

Thank you. I don't know why I was over looking that.
*February 28, 2010*

**physics**

If a particle of mass 5.7 kg is moving east at 10 m/s and a particle of mass 19 kg is moving west at 10 m/s, what is the velocity of the center of mass of the pair? Give answer is m/s to the west. I tired to use: Vcm = mv/M. I plugged in (5.7)(10) + (19)(10) / 5.7+19. = 57+190...
*February 28, 2010*

**physics**

A toy car with a mass of 120 g moves to the right with a speed of 0.56 m/s. A small child drops a 25.0-g piece of clay onto the car. The clay sticks to the car and the car continues to the right. What is the change in speed of the car? Consider the frictional force between the...
*February 28, 2010*

**Math**

Line L has equation of 4x + 3y = 7. Find equation of the line that is perpendicular to L which passes through the point of intersection of L and the y-axis. Give answer in the form ax + by +c = 0.
*February 4, 2010*

**Physics**

A block of mass m1 = 4.1 kg rests on a frictionless horizontal surface. A second block of mass m2 = 1.7 kg hangs from an ideal cord of negligible mass that runs over an ideal pulley and then is connected to the first block. The blocks are released from rest. (a) Find the ...
*January 25, 2010*

**Physics**

A skydiver, who weighs 682 N, is falling at a constant speed with his parachute open. Consider the apparatus that connects the parachute to the skydiver to be part of the parachute. The parachute pulls upward with a force of 669 N. (a) What is the force of the air resistance ...
*January 25, 2010*

**5th grade**

How to figure out if a fraction is in its simplest form.
*January 20, 2010*

**geometry**

A 6-foot ladder touches the side of a building at a point 5 feet above the ground. At what height would a 15-foot ladder touch the building if it makes the same angle with the ground as the shorter ladder?
*January 14, 2010*

**social studies**

in the south, by 1863, what were the ages for conscription ?
*January 13, 2010*

**social studies**

the telephone company helped to employ women with the invention of what ?
*January 13, 2010*

**AP Chemistry**

Write the expression of for the base dissociation constant for hydrazine, N2H4, a weak base. Hydrazine reacts with water to form the N2H5+ ion.
*January 11, 2010*

**AP Chemistry**

Rank these compounds in order of increasing hyroxide ion concentration: weak base, weak acid, strong base, strong acid.
*January 11, 2010*

**12th grade**

puritans
*December 29, 2009*

**chemistry**

. Do you think that determining the volumes of your cylindrical metal samples by measuring their dimensions and calculating would be more or less accurate than determining these volumes by water displacement?
*December 1, 2009*

**AP Chemistry**

Iron has a density of 7.86 g/cm3 and crystallines in a body-centered cubic lattice. Show that only 68% of a body-centered lattice is actually occupied by atoms, and determine the atomic radius of iron.
*November 14, 2009*

**AP Chemistry**

You are given a small bar of an unknown metal X. You find the density of the metal to be 10.5g/cm3. An x-ray diffraction experiment measures the edge of the face-centered cubic unit cell as 4.09 A. (1A=10^-10m) Identify X.
*November 14, 2009*

**AP Chemistry**

Why is HCI added on a drop-by-drop basis to ensure complete precipitation of Group 1 chlorides initially, rather than just added all at once? HCI forms a mixture of AgCI, PbCI2, Hg2CI2
*November 12, 2009*

**AP Chemistry **

I dont have one.
*November 11, 2009*

**AP Chemistry **

What is the specific solubilities (in g/100 g H2O) in both cold and hot water for AgCI, PbCI2, and Hg2CI2?
*November 11, 2009*

**Physics**

Why is it that when water is in a bucket and spinning around in a circular motion and then upside down the water in the bucket does not move or spill? Am not sure on what terms to use to explain why this happens
*November 4, 2009*

**Media Law**

Ok, thank you!
*November 1, 2009*

**Media Law**

What about sensitive national security meetings? Should the media have access to these too? How about military meetings or Court Martials?
*November 1, 2009*

**Media Law**

What are the reasonable limits in which the media should be allowed to cover governmental meetings in the media role of informing the electorate of the activities of government?
*November 1, 2009*

**2nd grade**

You have to find out which numbers add up to 8. So start with 43 and work your way up.
*October 27, 2009*

**6th grade**

This is hard
*October 25, 2009*

**college**

how many molecules of h20 are present in 75.0g of h2o
*October 20, 2009*

**Social Studies**

My daughter is in the 5th grade and has to prepare a totem pole based on her family's history...I know how to make a totem pole, but how do you make one based on your family history?
*October 18, 2009*

**Physics**

I got the answer! Thank you! Can you help me with the second problem please?
*October 16, 2009*

**Physics**

A 61-kg person on skis is going down a hill sloped at 30¡Æ from the horizontal. The coefficient of friction between the skis and the snow is 0.16. What would be the magnitude of the acceleration? An crate weighing 576 N is resting on a plane inclined 29¡&...
*October 16, 2009*

**Math**

What does the representational form of a number mean? For example the repersentational form of the number 3758.
*October 12, 2009*

**Communication Law Studies**

Can democracy be established and function without assurances of freedom of speech and freedom of press?
*September 14, 2009*

**English/Grammer**

Can you tell me what the simple subject of this sentence: Several of the caves are open to the public. I say it is caves. My teacher said it was several. I thought that several would be the complete predicate. Can you help
*September 10, 2009*

**math**

during the winter bill blank has been quite concerned about the total number of gallons of home heatiang fuel he used. last winter he used 1505 7/8 gallons of oil. here is a summary of this years usage... dec. 525 1/4 jan.488 5/8 feb. 481 3/8 mar.255 1/3 is it more of less ...
*September 7, 2009*

**statistics**

a set of building blocks includes blocks of various shapes and colors. if 10% of the blocks are cubes, and 40% of the cube blocks are red, then what percentage of the blocks are red cubes
*September 7, 2009*

**environmental management**

Will gaseous ammonia at 132 degree C liquefy when 100 atmospheres of pressure is applied to it? Why or why not?
*September 7, 2009*

**health**

How might Michael’s or Jennifer’s situation illustrate adjustment? How might this situation become an opportunity for personal growth?
*August 23, 2009*

**psy**

3. How might Michael’s or Jennifer’s situation illustrate adjustment? How might this situation become an opportunity for personal growth?
*August 22, 2009*

**Algebra**

What is the numerical value of the equations below? Thank you! 24*e^(0.06*384)
*August 8, 2009*

**Algebra**

Thanks! So then the final answer is that (x)/(x^2-4) (x)/(x-2) (x+2) Standard form then this = y = 0?
*August 5, 2009*

**Algebra**

So does this mean that the horizontal asymptote for f(x) = (x)/(x^2 -4) Is not 0? A horizontal asymptote is the y-value approaches as x approaches } ‡. Does this include 0? y= 0 ???
*August 5, 2009*

**Algebra**

What is the value of the horizontal asymptote for f(x) = (x)/(x^2 -4) This is my question?
*August 5, 2009*

**Algebra**

What does this mean in words please? Thanks!
*August 5, 2009*

**Algebra**

I need the horizontal asymptote for f(x) = (x)/(x^2 -4) Can someone please show me. I already figured out that The y-intercept is 0. The vertical asymptotes are x = -2, x = 2 So now all i need is horizontal asymptote for f(x) = (x)/(x^2 -4)
*August 5, 2009*

**Algebra**

C(x) = x2 - 30x + 7000, find the number of units manufactured at a cost of $8000
*August 2, 2009*

**Algebra**

Find all of the zeros of the polynomial function and state the multiplicity of each. f (x) = (x^2 – 16)^2 – 4 with multiplicity 2 and 4 with multiplicity 2 I think this is the ans for this equation. Anyone care to chime in? Thanks!
*July 24, 2009*

**Games**

is webkinz a safe site to play on, is it protected from viruses?
*July 20, 2009*

**Communication Theory**

Thanks!
*July 20, 2009*

**Communication Theory**

In general? So does it depend on the group and what is going on within it?
*July 20, 2009*

**Communication Theory**

Do most groups make decisions that have no lasting effect upon the relationships of individuals within the group?
*July 20, 2009*

**comm 220**

Inthe 1941 speech Citizen Kane what are the arguments and counter arguments
*July 18, 2009*

**Algebra**

Is that the final answer? Thanks for your help!
*July 15, 2009*

**Algebra**

Find a rational function that satisfies the given conditions. Answers may vary, but try to give the simplest answer possible: Vertical asymptotes x = -4, x = 5; x-intercept (-2, 0)
*July 15, 2009*

**Math Fractions**

What is the first step to adding multiple fractions (3) with differenct denominators?
*July 8, 2009*

**Algebra**

2 or 1 or 2 or -1? annaiiz ceballos said it is x=2 or x=1 its x=2 or x=-1
*July 7, 2009*

**Algebra**

I am still confused. Can someone please explain further and break this problem down cause I have 5 more like this one to do. Thank you!
*July 7, 2009*

**Algebra**

Solve the equation. Check all proposed solutions. Show work in solving and in checking. Root3-x = x-1
*July 7, 2009*

**English**

Please Proofread for Me. If you see any errors please state them. Witnessed a Wrong Incident People today, sometimes witness people during things wrong, but they refuse to tell. Many times, they do not tell because they do not want to hurt the person’s feelings, or lose ...
*July 7, 2009*

**english comp**

Are these sentences correct now? As he stands in the backyard, and howls, my husband's will yell,"Shut up!" Now he cannot get out;however, he still tries. We brought many things to keep him in the fence: two chain, two heavy-duty hooks, and a new collar. The ...
*July 1, 2009*

**English Comp.**

Are these sentences correct now? As he stands in the backyard, and howls, my husband's will yell,"Shut up!" Now he cannot get out;however, he still tries. We brought many things to keep him in the fence: two chain, two heavy-duty hooks, and a new collar. The ...
*July 1, 2009*

**English Comp.**

My dog Napoleon barks constantly. He is a blonde and white Bassett Hound; he is quite a valuable dog. He was born at my parent’s house. When he was born, he was the largest of the litter. Now, he is the smallest. As he stands in the back yard and howls, my husband’s ...
*July 1, 2009*

**English Comp.**

Punctuate the following sentences correctly.See did I do these sentences right. 1. My dog Napoleon barks constantly. 2. He is a blonde and white Bassett Hound; he is quite a valuable dog. 3. He was born at my parent’s house. 4. When he was born, he was the largest of the ...
*July 1, 2009*

**Algebra**

My mistake 4-(9) = -5 ? This is what I believe to be the correct answer
*June 27, 2009*

**Algebra**

Please Solve: 4-x=-5 I thought the answer was -9 but that doesn't seem to be it. Can someone please help? Thanks! This is what I have: 6. 4-x=-5 The problem to solve is: 4-x=-5 Subtract 4 from both sides x = -9 Then divie by -1 Would the answer be 9? To Check: 4- - 9 = -5
*June 27, 2009*

**Math**

So the 16 is not part of the answer? It's just 25 a^9?
*June 25, 2009*

**Math**

Please simplify: Very confused, have many problems like this and need some guidence. Thanks! (root5a^7/2)^4 a^3/a^8
*June 25, 2009*

**Algebra**

Thanks that is what I got to, so therefore A(x) = 60x – x^2 is the answer! Thanks for your help! :-)
*June 22, 2009*

**Algebra**

So would the answer be A(x) = 60x – x^2? Or A(x) = 120x – x2
*June 22, 2009*

**Algebra**

Suppose a farmer has 120 feet of fencing to make a rectangular barnyard enclosure. If the enclosure is x feet long, express the area A of the enclosure as a function of the length x.
*June 22, 2009*

**Physics**

Thanks- it makes sense, since i had to choose the closest to my answer.
*June 20, 2009*

**Physics**

The last stage in the fusion of hydrogen to form helium in the Sun involves the formation of an alpha particle (4He) from two 3He nuclei: 3He + 3He 4He + p + p The binding energy for 3He is 2.57 MeV per nucleon and that for 4He is 7.07 MeV per nucleon. Calculate the amount of ...
*June 20, 2009*

**Math**

Study the number pattern in the table below and complete 2^3 (0x3^2)+(3x2)+2 8 3^3 (1x4^2)+(3x3)+2 27 4^3 (2x5^2)+ (3x4)+2 64 5^3(3x6^2)+(3x5)+2 125 6^3 ? ? ? ? ? ? ? ? ? 10^3 ? ? ? Is the pattern 6^3 (4x7^2)+(3x6)+2 216 7^3 (5x8^2)+ (3x7)+2 343 8^3 (6x9^2)+ (3x8)+2 512 9^3 (...
*June 19, 2009*

**math**

There are 7 men on a bus. Each has 7 backpacks. Each backpack has 7 cats, each nursing 7 kittens, all on the bus. How many legs are on the bus? (This is not a trick question. The driver has stepped off to use the facilities; the cats should have. All animals and humans have ...
*June 19, 2009*

**Mathematics**

Study the number pattern in the table below and complete 2^3 (0x3^2)+(3x2)+2 8 3^3 (1x4^2)+(3x3)+2 27 4^3 (2x5^2)+ (3x4)+2 64 5^3(3x6^2)+(3x5)+2 125 6^3 ? ? ? ? ? ? ? ? ? 10^3 ? ? ? n^3 (n-2)x( )^2)+(3x )+2 n^3
*June 19, 2009*

**Math**

In ABC, angle C is a right angle. AC=15 and BC=13. Find the measure of angle B. Round answer to nearest tenth. I need to know what you're supposed to enter in a graphing calculator to get this.
*June 19, 2009*

**Math**

This rectangle represents a tabletop. Its measured length is 48.5 ft, and its measured width is 36.5 ft.The relative error of these measured dimensions is 0.04. What is the relative error when computing the area of the tabletop? a. 0.0082 b. 0.082 c. 0.82 d. 8.2 I think the ...
*June 16, 2009*

**Science**

Approximately what percentage of the estimated age of Earth does the Cenozoic Era represent and how do you know? look at pg. 9 in Earth Science Reference Tables? a. 1.4% b. 5.0% c. 11.9% d. 65.0%
*June 15, 2009*

**Science**

When 1 gram of liquid water at 0 degrees Celsius freezes to form ice, how many total calories of heat are lost by the water and how do you know? a. 1 b. 0.5 c. 80 d. 540
*June 15, 2009*

**Science**

What is different about the appearence of rocks with mineral alignment and rocks with banding?
*June 15, 2009*

**Math**

The formula N = 10(4') gives N, the number of bacteria present in a culture after t hours. How many hours does it take for the number of bacteria to grow to 2,560? a. 2 hours b. 3 hours c. 4 hours d. 5 hours The answer is c., but is there another way to find this answer ...
*June 14, 2009*

**Math**

If four coins are flipped at once, what is the probability that exactly 3 tails will come up? a. 1/16 b. 1/8 c. 1/4 d. 1/2 The answer is c, but what do you do to get that?
*June 13, 2009*

**math**

y^2-6y=-7 x^2=8x-41 (4x-1)(2x+6)=3x 45-t^2=0 (3x-6)^2=33
*June 13, 2009*

**Math**

thanks
*June 10, 2009*

**Math**

A movie theater recorded the number of tickets sold daily for a popular movie during the month of June. A box-and-whisker plot represents the number of tickets sold. minimum-100 maximum-8 1st quartile-300 median-400 3rd quartile-600 Which conclusion can be made using this plot...
*June 10, 2009*

**Math**

Do you have to reduce fractions to simplest from when finding probability, or can you just leave it?
*June 9, 2009*

**Math**

But in this part, "It says 110 take M and T, but we have already placed 20 of those 110, that leaves 90 to go into the region covered by M and S but NOT by T." why can't you put it in M and T, when that was what 110 is for?
*June 9, 2009*

**Math**

thank you!
*June 9, 2009*

**Math**

In a class of 550 students, students may take all, none, or a combination of courses as follows.? Draw a Venn diagram to find how many students are not in any of these courses. Mathematics-280 Science-200 Technology-230 Mathematics and Technology-110 Science and Technology-100...
*June 9, 2009*

**French**

thanks
*June 8, 2009*

**French**

In "le maïs", what is the two dots on top of the i called in english?
*June 8, 2009*

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