Friday

February 27, 2015

February 27, 2015

Total # Posts: 1,729

**Physics**

Thanks very much.
*November 21, 2010*

**Physics**

I am doing an assignment where I need to find an example of a spring that is used in a common device. Is a phone chord considered a spring? Thanks for your help.
*November 21, 2010*

**Chemistry**

A quantity N2 of occupies a volume of 1.4L at 290K and 1.5atm . The gas expands to a volume of 3.1 L as the result of a change in both temperature and pressure. I have the find the density of the gas at these new conditions?
*November 20, 2010*

**Algebra**

Please let me know if I figured this out correctly ... 2t + 4 >/= t -t -t 1t + 4 >/= 0 - 4 -4 1t >/= -4 /1 /1 t >/= -4
*November 18, 2010*

**Chemistry**

Calculate the H3O+ concentration and pH of a carbonated beverage that is .10 M in dissolved CO2- (Essentially all of the H3O+ comes from the first stage of dissociation, CO2 + 2H2O = H3O^+ + HCO3-, for which K1 = 4.4 x 10^-7)
*November 17, 2010*

**Science**

Thank you! :)
*November 17, 2010*

**Science**

What do noble gases have in common?
*November 17, 2010*

**PHYSICS !**

Yes thank you so much!
*November 11, 2010*

**PHYSICS !**

If a ball is sliding down a ramp that is on a slant, so that the ball sliding down falls off. Is the speed of the ball constant(meaning staying at the same speed)? or Speeding up? If so, how?
*November 11, 2010*

**ANATOMY **

i found out its Stratified Squamous -___-
*November 11, 2010*

**ANATOMY **

anyone know ?
*November 11, 2010*

**ANATOMY **

Is the lining of the esophagus either : 1) Simple Squamous? OR 2) Stratified Squamous? -Please help . I know it has to be either 1 or 2.
*November 11, 2010*

**Math**

110 X 90/100=99
*November 11, 2010*

**Math**

What is 90% of 110?
*November 11, 2010*

**Teacher Aide**

can you please check my answers to the same test below? it would mean the world to me : ) 1)D 2)D 3)C 4)C 5)B 6)C 7)A 8)C 9)A 10)C 11)D 12)A 13)C 14)D 15)B 16)A 17)B 18)B 19)C 20)C
*November 11, 2010*

**chemistry**

Calculate the mass of ethanol required to heat 200mL of water from 21 degrees celcius to 45 degress celcius
*November 9, 2010*

**english**

what is the game for instance halo about
*November 7, 2010*

**english**

what are some american made video games that are violent besides Grand Theft Auto?
*November 7, 2010*

**Math**

What does it mean if a line in R^3 is parallel to the xy-plane but not to any of the axes. I really don't know what this means in terms of how the parametric and symmetric equations of the line should look. Please help.
*November 2, 2010*

**Math**

What does it mean if a line in R^3 is parallel to the xy-plane but not to any of the axes. I really don't know what this means in terms of how the parametric and symmetric equations of the line should look. Please help.
*October 27, 2010*

**english**

Please help with this assignment!Thanks. I picked "Justice" I want to write about What is the moral aspect of Justice. Tell how can I write like the following below. Have to write like this and don't know how to go about it.Thanks! Definition Read the following ...
*October 26, 2010*

**physics**

A 3.0 m long rigid beam with a mass of 100 kg is supported at each end. An 60 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam? support 1- support 2-
*October 26, 2010*

**English**

Need help with topic "Justice" Need 2 question: is what is the moral aspect of Justice? Research plan: Have investigate my question. I am kind stuck on this topic, please help me to write 3 pages. Thanks.
*October 26, 2010*

**precalc**

find the zeros of the function: f(x)=x^3+2x^2-109x-110 I think I need to factor but everytime I do, it doesn't look right.
*October 24, 2010*

**Math**

I'm doing a vector problem which involves two forces with an angle of 30 degrees between them acting on an object. I think that I should draw my vector diagram with the vectors coming out of the object while my friend thinks that the vectors should point into the object. ...
*October 22, 2010*

**algebra help**

206
*October 21, 2010*

**algebra help**

i think so but the answer suppose to be in the form of x and y
*October 21, 2010*

**algebra help**

so is the answer 50
*October 21, 2010*

**algebra help**

Two motorcyclists start at the same point and travel in opposite directions. One travel 3 mph faster than the other. In two hours they are 206 miles apart. How fast is each traveling? The speed of the slower motorcyclist is ___ mph.
*October 21, 2010*

**physics**

Two children are balancing on a teeter-totter. One child has a mass of 30.0 kg and is sitting 1.3 meters from the pivot. The second child is sitting 0.8 meters from the pivot. What is the mass of the second child
*October 21, 2010*

**physics**

Two children are balancing on a teeter-totter. One child has a mass of 30.0 kg and is sitting 1.3 meters from the pivot. The second child is sitting 0.8 meters from the pivot. What is the mass of the second child
*October 21, 2010*

**physics**

An athlete at the gym holds a 1.2 kg steel ball in his hand. His arm is 64 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm in each of the following ways? 1. straight but 30 degrees below horizonal?
*October 21, 2010*

**physics**

An athlete at the gym holds a 1.2 kg steel ball in his hand. His arm is 64 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm in each of the following ways? 1. straight but 30 degrees below horizonal?
*October 21, 2010*

**Algebra**

To simplify the expression of 4r(3r-7) I came up with 12r^-28r. I cannot take this any further because they are not like terms, is that correct?
*October 20, 2010*

**physics**

A 6.9-kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling.Lifted at a constant speed of 2 m/s. If the box is lifted, at constant acceleration, from rest on the floor to a height of 1.5 m ...
*October 20, 2010*

**spanish**

how do i answer these question donde esta la universidad? como es la universidad? cuando es la clase de espanol?
*October 20, 2010*

**spanish help**

so for it the answer would be el or ella
*October 20, 2010*

**spanish help**

What is the spanish equivalent to the following subject pronouns it and we
*October 20, 2010*

**Math/Vectors**

Thanks!
*October 17, 2010*

**Math/Vectors**

If a point on the surface of a sphere with its center at the origin has coordinates (9,4,6) how do you show the radius connecting the origin to this point as a position vector. Is it simply [9,4,6] or is it more complicated than that. Thanks.
*October 17, 2010*

**Math**

I think it's correct. The negative sign in front of the parenthesis was throwing me off. Just need to make sure I'm understanding it correctly.
*October 17, 2010*

**Math**

How about this one? Simplify: -(21k - 3 + 4) - 17k -21 + 3 + -4 - 17k -38k + -1
*October 17, 2010*

**Math**

Just so I know I am understanding this, can you please let me know if I am doing this right? Simplify: 24u - 6(8 - 4u) + 52 24u -48 + 24u + 52 48u + 4 Thanks!!!!
*October 17, 2010*

**algebra**

If f(x)=x^2-x, find the value if x=(2)-2. TIP: x^2 means x squared
*October 17, 2010*

**Math/Vectors**

I need help on a homework problem. "Determine a vector equation for the line perpendicular to 4x-3y=17 and through point (-2,4). The answer in the book is given as [x,y]=[-2,4]+t[-4,3].Isn't the normal to the scalar equation [4,-3] and wouldn't this be the ...
*October 16, 2010*

**Chemistry **

Can someone explain to me what the calorimetry equation - q=(m)(ΔT)(Cp) means exactly, in your own words, and how identifying an unknown metal relates to every day life? thanks
*October 13, 2010*

**math**

y = 2.5 ·4^x as the equation for the blue line shown in the graph, rather than the equation given in your text. Note that your line will now be tangent to the graph at the point ( 0, 2.5 ). Enter the value of c here
*October 13, 2010*

**math**

The population of the town of Missed Chances has, since January 1, 1972, been described by the function P = 30000 ( 1.01 )^t where P is the population t years after the start of 1972. At what rate was the population changing on January 1, 1995? people per year
*October 13, 2010*

**science**

Calculate the molarity of 500. mL of solution containing 21.1 g of potassium iodide
*October 12, 2010*

**Chemistry**

A gas sample is connected to a closed-end manometer. The difference in mercury levels in the 2 arms is 115 mm. What is the gas pressure in torr if the atmospheric pressure is 750. torr?
*October 12, 2010*

**Math**

A lunch box is 30cm long, 14cm wide and 12cm high. The formula for the volume of a box is v=lwh. Find the volume of the lunch box in cubic centimeters. Can you help me to set this up? Thanks!!!
*October 10, 2010*

**math**

find an equation of the line containing the given pair of points. Use function notation to write the equation. (5/7,10/14) and (-1/7,13/14) f(x)
*October 8, 2010*

**math**

how do I solve the equation (y+6) divided by 3- (y-3) divided by2=2
*October 7, 2010*

**chemistry**

At 25 degrees celsius, the dimensions of a rectangular block of gold are 4.42 cm by 3.07 cm by 2.63 cm. The mass of the gold is 689g. I found that the density is 19.3g/cm^3 at 25 degrees but how will the density change if the temperature is increased to 125 degrees?
*September 30, 2010*

**math**

How can you make 7 by only using the digits 1, 2, 3, and 4? You can put two numbers together (ie 12 or 34). You can use the operations: addition, subtraction, multiplication, (NO DIVISION!!), exponents, and parentheses any way you want!! Please help!!!! I also need 13, 17, and...
*September 29, 2010*

**english**

yes and yes
*September 29, 2010*

**english**

yes
*September 29, 2010*

**math**

x=6 so i believe the answer would be 18+12+12 which equals 42 im not for sure though but thats how i think you would do it
*September 29, 2010*

**math**

Thanks!!!!!!!!!!!
*September 29, 2010*

**math**

How can you make 34 by only using the digits 1, 2, 3, and 4? You can put two numbers together (ie 12 or 34). You can use the operations: addition, subtraction, multiplication, (NO DIVISION!!), exponents, and parentheses any way you want!! Please help!!!!
*September 29, 2010*

**math**

I think the formula would be 30=2.25x
*September 29, 2010*

**math**

6r-3=15 -3 -3 __________ 6r=12 then do 12 divided by 6 and the answer is simple!!!!!
*September 28, 2010*

**Teachers Aide/Early Childhood Education and After-**

never mind! omg! i made a huge mistake! don't follow my answers! these are the answers to test #02604200
*September 28, 2010*

**Teachers Aide/Early Childhood Education and After-**

okay, you've got a lot wrong. 1) pg. 59 2) pg. 28,33 3)A 4) pg. 57 5) pg. 16 6) pg. 4-5 7) pg. 26 8) pg. 30-31 9) A 10) pg. 60 11) pg. 2 12) B 13) pg. 8 14) pg. 13 15) D 16) C 17) B 18) pg. 58 19) pg. 36-37 20) pg. 64
*September 28, 2010*

**Math**

Just checking to make sure I understand this. Absolute value bars are grouping symbols. Use the order of operations to evaluate the expression -3 + /-x + 2/ when x=12 -3 + /-12 + 2/ = 11 Thanks!
*September 27, 2010*

**Chemistry**

A water solution containing 25.0% sucrose by mass, has a density of 1.25g/mL. What volume of this solution in liters, must be in an application requiring 2.50 KG of sucrose?
*September 27, 2010*

**Biology Chemistry Part**

I'm trying to calculated the rate of reaction In this lab I took a 50 mL beaker and poured in 10 ml of cold distilled water into it, I then poured in 30 ml of original enzyme solution (I believed we used cold potato juice or something), I then took a piece of paper and ...
*September 26, 2010*

**Biology Chemistry Part**

I'm trying to calculated the rate of reaction In this lab I took a 50 mL beaker and poured in 10 ml of cold distilled water into it, I then poured in 30 ml of original enzyme solution (I believed we used cold potato juice or something), I then took a piece of paper and ...
*September 26, 2010*

**algebra**

thank you
*September 25, 2010*

**algebra**

3x+y=7 for y -x+y=13 for y f=5gh for h
*September 25, 2010*

**science**

choose a metal you know and list three uses that illustrate three properties of metals
*September 23, 2010*

**algebra**

solve the equation and check -(9x-4)-(2x-6)+7=-8(x-9)-(6x+2)+4
*September 18, 2010*

**calculus**

Use the following function values to calculate H '(1). f (1) f '(1) g(1) g'(1) 3 -4 8 -1 H(x) = x/(g(x) f(x)) How would this problem be done... i found H(x) to be 1/24 but don't know how to find the derivative of h'(1)
*September 18, 2010*

**algebra**

solve each equation 4(n+3)=2(6+2n)
*September 18, 2010*

**math **

Simplify the expression 4(3z^3-6)+12(2-z^3)=
*September 15, 2010*

**algebra II**

sorry for calling it an equation i mean i have to simplify the expression
*September 9, 2010*

**algebra II**

need help solving the equation 5y-14+7y-20y
*September 9, 2010*

**Math**

Kim is twice the age of Ryan. In 4 years Kim will be 7 years older than Ryan. How old is Kim now?
*September 9, 2010*

**chemistry**

What is the correct formula for calcium nitrate
*September 8, 2010*

**chemistry**

793.4 g
*September 8, 2010*

**chemistry**

a brain weighing 1.0 Ib occupies a volume of 620 ml. What is the specific gravity of the brain?
*September 7, 2010*

**Algebra**

A moving Company weighs 20 boxes you have packed that contain either books or clothes and says the total weight is 404 pounds. You know that a box of books weighs 40 pounds and a box of clothes weighs 7 pounds. Find how many boxes of books and how many boxes of clothes you ...
*September 7, 2010*

**Chemistry**

An alpha particle (mass = 6.6 10-24 g) emitted by radium travels at 2.5 107 ± 0.1 107 mi/h. (a) What is its de Broglie wavelength (in meters)? (b) What is the uncertainty in its position?
*September 5, 2010*

**algebra 1**

how to simplify and solve 2/5(20x+5)-1/2(8-4x)=38
*September 5, 2010*

**math**

Sam ran between 8 and 15 miles a week for 5 weeks.About how many miles could he have run?
*September 1, 2010*

**ALL OF JISHKA STAFF**

Hello I had a couple of questions and was woundering if you have staff members that are teaching or have taught AP BIOLOGY AP PHYSICS B AP CALCULUS AB AP CHEMISTRY I was told that the AP BIOLOGY teacher had gotten extremly ill =(, has he come back? Also can you tell me if you ...
*August 19, 2010*

**English (Biology Essay)**

I know my english is crap any corrections suggestions cirtisims etc. would greatly be apreciated... if you know any biology and find anything that is biologically wrong that would be great as well but don't worry if you don't THANK YOU!!! im putting my initals just in ...
*August 16, 2010*

**Physics**

Convert 5:25:25 to seconds.
*August 16, 2010*

**Algebra**

Available evidence suggests that about 20 percent of the asteroid’s mass turned to dust and spread uniformly over Earth after eventually settling out of the upper atmosphere. This dust amounted to about 0.02 g/cm^2 of Earth’s surface. The asteroid very likely had a ...
*August 16, 2010*

**Calculus**

dont worry about it i think i'm gettin g some where
*August 12, 2010*

**Calculus**

actually cos(x)=-2 has an infinte amount of solutions so to say it dosen't have ONE is just wrong... but yah I don't buy that the equation, in some post below doesn't have critical points they are defined I found them, but whatever anyways can you help me simplify ...
*August 12, 2010*

**Calculus**

same as my question below please help me post your answer on here if you have one on these forms of course h t t p : / / w w w . p h y s i c s f o r u m s . c o m / s h o w t h r e a d . p h p ? t = 4 2 1 7 6 3
*August 12, 2010*

**Calculus**

no one on physics forums seems to know the answer so I was wondering if you guys could help post anser on these forms of course if you can help my question is here h t t p : / / w w w . p h y s i c s f o r u m s . c o m / s h o w t h r e a d . p h p ? t = 4 2 1 7 5 8
*August 12, 2010*

**Chemistry**

For many years the recovery of gold-that is, the seperation of gold from other materials-involved the use of potassium cyanide: 4AU + 8KCN + 02 +2H20 -> 4KAu(CN)2 + 4KOH What is the minimum amount of KCN in moles needed to extract 29.0 g (about an ounce) of gold? Now my ...
*August 2, 2010*

**physics**

And it's around 16.4 -- I just can't get it to the exact value that the Webassign will accept. Thank you again!
*July 28, 2010*

**physics**

They are connected by a string -- unfortunately I am unable to link the diagram. I believe that for the purpose of the problem they are ideal strings.
*July 28, 2010*

**physics**

In the figure we see two blocks connected by a string and tied to a wall, with theta = 33°. The mass of the lower block is m = 1.0 kg; the mass of the upper block is 2.0 kg. The tension of the string connecting the blocks is 5.337. Find the tension in the string that is ...
*July 28, 2010*

**Algebra I**

Rectangle ABCD has vertices C and d on the x-axis and vertices A and B on part of the parabola y = 9 - x^2 that is above the x-axis. a.) Find the coordinates of A, B, C, and D in terms of x. b.) Determine the Area of the rectangle as a function of x. c.) What is the domain for...
*July 28, 2010*

**Math**

x +/- 3 is that mroe simplified then writing it out x + 3, x - 3 I thought it would be becaue we normally say simple is when all of the operations that could be done is done in which case the second choice is more simple? I'm just woundering because i'm doing a summer ...
*July 28, 2010*

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