Sunday
December 21, 2014

Posts by lan


Total # Posts: 36

Physics
A vertical cylindrical tank contains 1.80 mol of an ideal gas under a pressure of 1.00 atm at 20.0oC. The round part of the tank has a radius of 10.0 cm, and the gas is supporting a piston that can move up and down in the cylinder without friction. (a) What is the mass of this...
December 6, 2014

Physics
A cylinder 1.00 m tall with inside diameter 0.120 m is used to hold propane gas (molar mass 44.1 g/mol). It is initially filled with gas until the gauge pressure is 1.30 x 106 Pa and the temperature is 22.0oC. The temperature of the gas remains constant as it is partially ...
December 6, 2014

Finance
Based on Purchasing power parity (ppp)what is a general forecast of the values of currencies in countries with high inflation?
August 14, 2014

chemistry Equations
Write euations to show how a buffer made up of equimolar amounts of acetic acid, CH3COOH, and acetate, CH3COO-, would behave when (a) HCl was added and (b) NaOH was added. Is this right,If not what is the correct way? CH3COOH + HCl ----> CH3COOHCl + OH CH3COO + NaOH ---->...
April 20, 2014

earth science
what would be the chart to use for carbon 14 whcih has a half life of 5730 years and a piece of wood which originally has 12 grams pf radioactive isotope; If the half lives occurred and now has 0.75 grams left?
November 29, 2012

earth science
if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days
November 29, 2012

earth science
if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days
November 29, 2012

earth science
if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days
November 29, 2012

dawson
does this macbeth thesis and scope make sense?
May 10, 2012

algebra
Explain in your own words what it means for an equation to model a real world situation an give an example. -it is right to say that when given a problem, we want to identify the quality of the problem we want to find, translate form word to algebra, and make up an equation ...
November 15, 2011

algebra
find an equation for the line that passes through the point (6,-3)and has slope -1/2
November 14, 2011

algebra
solve the inequality. Express the solution using interval notation and graph the solution set on the real number line x-4/x^2-4 greater or equal to O
November 14, 2011

algebra
find the length x in the figure a shape like a shoe with x on top, 10 cm to the height, 6cm on the lace shoes and x in the front shoes.the area of the shaded region is given 144 cm square.
November 8, 2011

pre-calculus
a pasture is twice as long as it is wide. Its area is 115,200 ft square. How wide is the pasture
November 6, 2011

CAL
(1 pt) A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.3 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 8 cm. (Note the answer is a positive number).
July 10, 2011

CAL
The altitude of a triangle is increasing at a rate of 2500 centimeters/minute while the area of the triangle is increasing at a rate of 4000 square centimeters/minute. At what rate is the base of the triangle changing when the altitude is 11500 centimeters and the area is ...
July 10, 2011

math
THANK YOU !
July 10, 2011

math
use implicit differentiation to find the slope of the tangent line to the curve (y)/(x-7y)=x^6+5 at the point (1,6/43)
July 10, 2011

CAL
use implicit differentiation to find the slope of the tangent line to the curve (y)/(x-7y)=x^6+5 at the point (1,6/43)
July 9, 2011

CAL
consider the area between the graphs x+3y=1 and x+9=y^2. this area can be computed in two different ways using integrals. Please integral both ways both respect to x and to y. ANd please show your work and thank you
July 7, 2011

Cal
the question is to find the area. they are two ways either respect to x or respect to y. One way either by doing it to x or to y, your going to end up adding two integrals together to get the answer and the other one the much faster way you only need to compute to integral. My...
July 7, 2011

Cal
consider the area between the graphs x+3y=1 and x+9=y^2. this area can be computed in two different ways using integrals. First of all it can be computed as a sum of two integrals where a=,b=,c= and f(x0= and g(x)=. Alterntaively this area can be computed as a single integral
July 7, 2011

Cal
consider the area between the graphs x+3y=1 and x+9=y^2. this area can be computed in two different ways using integrals. First of all it can be computed as a sum of two integrals where a=,b=,c= and f(x0= and g(x)=. Alterntaively this area can be computed as a single integral
July 7, 2011

trigonometry
Find the sum of all of the solutions to the equation cos(2x) - sin2(x) - 1 = 0 in the interval 0 < x < 5 pi. (Use radian measure for x.) (A) 15pi (B) 0 (C) pi (D) 10pi (E) None of the above.
May 12, 2011

trigonometry
what is the value of x in the equation x= 3sqrt root (-245)-1/5 to the nearest hundreds
May 12, 2011

trig
A right triangle has sides of length 5, 12 and 13. What is the sine of the angle opposite the hypotenuse? (A) 1 (B) 5/12 (C) 5/13 (D) 12/13 (E) None of the above.
May 8, 2011

trig
If csc(x) =1/sqrt7 then sec(x) equals (A)p7/7 (B) 6/7 (C)p6/p7 (D)p7 (E) None of the above.
May 8, 2011

trig
use a half angle formula to find the exact value of cos 75 degree
May 8, 2011

trig
Find a numerical value of one trigonometric function of x if secxcotx=4 A.cscx=1/4 b.secx=4 c.secx=1/4 d.cscx=4
May 8, 2011

physics
ehh malý Vsquare*density diyosun sonuç sonsuz mu çýkýcak?
April 1, 2011

art
what changes when we bring the element that make the earthwork indoor?
December 11, 2010

social studies
what is the lush region that formed a great arc
November 5, 2009

Physics
1000
November 4, 2009

reading
what is text clues?
December 13, 2007

Physical Chemistry HELP!!!!!
A solution of the sugar mannitol ( molar mass 182.2 g/mol ) is prepared by adding 54.66 g of mannitol to 1.000 kg of water. The vapor pressure of pure liquid water is 17.54 torr at 20o C. Mannitol is nonvolatile and does not ionize in aqueous solution. a.) Assuming that ...
October 14, 2006

Physical Chemistry
When 3.78 g of nonvolatile solute is dissolved in 300.0 g of water, the freezing point depression is 0.646 o C. Calculate the molar mass of the solute. The cryoscopic constant of water is 1.86 K kg mol -1. When 3.78 g of nonvolatile solute is dissolved in 300.0 g of water, the...
October 12, 2006

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