Monday
May 4, 2015

Posts by tim


Total # Posts: 1,001

chemistry
What is the total vapor pressure4 at 20° C of a liquid solution containing 0.30 mole fraction benzene, C6H6, and 0.70 mole fraction toluene, C6H5CH3? Assume that Raoult’s law holds for each component of the solution. The vapor pressure of pure benzene at 20° C is ...
September 14, 2010

math
if a roof has a pitch of 5 degrees and the horizontal lenght is 5.29 metres how high is the vertical?
September 13, 2010

math
Give your own example of a function using a set of at least 4 ordered pairs. The DOMAIN will be any four integers between 0 and +10. The RANGE will be any four integers between -12 and 5
September 11, 2010

Amercain history
Due to the costs of production, the major news source that would NOT emerge as a major entity until the creation of cable television would be: Answer ABC. FOX. CBS. NBC.
September 7, 2010

College Chemistry
In this lab: we demonstrated the method of evaporation of a saturated sodium chloride solution. The following question ask: 1) why is sodium chloride chosen for the solute? 2)Suggest reasons why the following were not chosen for the solute? a)Calcium carbonate (CaCO3)= b)...
September 4, 2010

vocabulary
a group of similar things together is called?
September 2, 2010

4th grade
what part of speech is batteries
September 1, 2010

social studies
thats what i thought too but I just used Monarchs for the king question and the colonies for Colubus founded the first spanish "colony" in the americas. appreciate the help
August 23, 2010

social studies
middle passage monarch missionary mayflower compact northwest passage colony city-state conquistador parliament ..thanks for the help
August 23, 2010

social studies
profits from trade helped strong ??? develope in east africa
August 23, 2010

7th grade social studies
in the feudal system of Europe, lords owed their loyalty to the ???
August 23, 2010

graphing an equation
how would you graph 12x-3y=7 and x=2+13y?
August 22, 2010

college
explain why the graph of f(x)=(x+3)^2-4 looks similar to graph of f(x)=x^2
August 18, 2010

calculus
Use the ratio test to determine whether each series is convergent or divergent. 4/(1*2*3) + 8/(1*2*3*4) + 16(1*2*3*4*5) + ... How exactly do I do this? The example problem says to first find the nth term, but I don't know how. Help is much appreciated.
August 13, 2010

Algebra
Please Help me with this!
August 12, 2010

Algebra
Find the variation constant and an equation of variation where y varies directly as x and y=50 when x=10
August 12, 2010

Battle of jericho(book0
the hazing was all the stuff the warriors of destruction put on him and made him do.
August 10, 2010

Battle of jericho(book0
i have but i didnt understand it.
August 10, 2010

Battle of jericho(book0
what is the tragedy in the book? i cant find it !
August 10, 2010

statistics
In a contest in which 8 contestants are entered, in how many ways can the 5 distinct prizes be awarded?
August 8, 2010

statistics
In a class of 50 students, 31 are Democrats, 13 are business majors, and 3 of the business majors are Democrats. If one student is randomly selected from the class, find the probability of choosing a Democrat or a business major.
August 8, 2010

Chemistry
2.7×10−39 atm
August 2, 2010

advenced functions
determine the exact value of 3^-1 -2(1/8)^-2/3
July 30, 2010

advanced functions
the height in meters, of a passenger on a Ferris wheel is given by the function h(t)=11-10cos(0.1pit), where t is the time in seconds. How long will it take a passenger to reach a height of 5 meters the first time? Express your answer to 3 decimal places.
July 30, 2010

advanced functions
simplify the rational expression x^4+3x^3-2x^2-6x/x^3-2x stating all restrictions on the variable.
July 30, 2010

Physics
(iv) A tangential force of 20N is applied to one of the masses in the plane of rotation of (iii) above for 3.0 s . (Both the instantaneous velocity of the mass and the applied force are pointing in the same direction at all times). What is the final angular velocity of the rod...
July 29, 2010

Physics
thats great thanks very much (ii) Using the parallel-axis theorem or otherwise, find the moment of inertia of the dumbbell about an axis through one of the masses but perpendicular to the rod and for this question i need : I = Ic.m. + Md2 thats right isnt it?
July 29, 2010

Physics
A dumbbell consists of two equal compact masses of 2 kg each, connected by a massless rod of length 0.8 metres. What is the moment of inertia of the dumbbell about an axis through the centre of, but perpendicular to, the rod? could someone just tell me how to get started on ...
July 29, 2010

Physics
The rigid object shown in Fig. 10-63 consists of three balls and three connecting rods, with M = 1.5 kg, L = 0.67 m, and θ = 32°. Fig. 10-63 The balls may be treated as particles, and the connecting rods have negligible mass. Determine the rotational kinetic energy of...
July 28, 2010

math
a landscape architect plans to enclose a 3000 square foot rectangular region in a botanical garden. she will use shrubs costing 25$ per foot along 3 sides and fencing costing 15$ along the fourth. write a function that gives the architect's total cost as a function of the ...
July 20, 2010

math
What is the factor or 12x^2 -78x + 93.5
July 20, 2010

Chemistry 2
Consider the system I2 (g) <----> 2I (g) with H=+151 KJ. Suppose the system is at equilibrum at 1000 degree celsius. In which way will the reaction occur under each of the following conditions? 1. 1 atoms are added? 2. The temperture is increased? 3. The temperature is ...
July 14, 2010

art 101
looking for an in-text citation for impressionism.
July 13, 2010

Chemistry
Andre did you bother checking that the answers were in a different order this quarter? dumb!@#$%^&. The answer is Low, High, High
July 12, 2010

Chemistry 2
I am still confused could you work the problem out.
July 11, 2010

Chemistry 2
The rate constant nearly doubles for some reaction when there is an increase in temperaure from 17 degree celsius to 32 degree celsius. Calculate the activation energy.
July 11, 2010

Math
Hat sizes are determined by measuring the circumference of one's head in either inches or centimeters. Use ratio and Proportion to complete the following table. Hat Size: 6 and 7/8 Head Circumference (to the nearest 1/5 in): 21 and 3/5 Head Circumference (to the nearest cm...
July 11, 2010

Science
The effects are simple. Mass produced non-organic foods contain more toxins (herbicides, pesticides, fungicides and heavy metals). Hybrids between various plants have produced more allergies in people. Control of most of the food chain is now in the hands of multinational ...
June 24, 2010

college
A. Send the hard disk off to have what data can be recovered, recovered and pay the $1000 bucks to have it done quickly. B. Talk with the system manager about disaster management and the need for regular backups. C. Ask all staff if by chance they may have kept copies of ...
June 23, 2010

Math
Hi, how can i enter d=3.5+2sin(2pit/13),where t is time. into ti-83 calculator and sketch the graph for time 0 to 30 hours.
June 20, 2010

Math help
Hi again how can i get the growth factor by using exponential regression from the function Y = a(b^x) and i have calculated the value of a and b.
June 19, 2010

Math help
what does a and b represent in linear regression Y=aX+b.
June 19, 2010

Math help
thankyou
June 18, 2010

Math help
d=0.005s^2+0.2s where d is the stopping distance in meter and s is the speed in km per hour. use the formula to find the stopping distance when a car is travelling at 70km per hour. my answer is 38.5 is that right.
June 18, 2010

Math
The park has an area of about 25cm^2 on the map and a map has a scale of 1:15000. calculate the area of the park on the ground. give answer to Km^2
June 18, 2010

Macroeconomics
a a c d
June 7, 2010

math
I posted this early, I don't understand, Two angles are complementary. The sum of the measure of the first angle and one-fourth the second angle is 87.75 degrees. Find the measures of the angles? What is the measure of the smaller angle? What is the measure of the other ...
May 21, 2010

math
A cellular phone company offers a a contract for which the cost C, in dollars, of t minutes of telephoning is given by C=0.25(t-600) + 40.95, where it is assumed that t ¡Ý600 minutes. What times will keep costs between $83.45 and $104.20? For the costs to be ...
May 21, 2010

Math
I am very confused?
May 21, 2010

chemistry
Which half-reaction represents reduction? Choose one answer. a. Cu → Cu^+2 + 2e- b. Fe^+2 → Fe^+3 + 1e- c. Ag^+1 + 1e- → Ag d. Al → Al^+3 + 3e-
May 20, 2010

science
if continental crust were thinner than its average thickness of 40 km would it depress the mantle more or less
May 19, 2010

Math
A manufacturer produces certain devices. The fixed cost of production is $2000. The first unit produced cost $2 and the cost per unit increases by 20 cents or each additional unit produced. What is the total cost C of producing x units?
May 10, 2010

algebra
for the system of inequalities y >= 2x - 1 and y <= 3x - 1, which of the following statements best descibes the ordered pair (1,1) a)The point (1,1) is a solution for y >= 2x - 1, but not y <= 3x - 1. b) The point (1,1) is not a solution for either equation. c)The ...
May 3, 2010

algebra
for the system of inequalities y >= 2x - 1 and y <= 3x - 1, which of the following statements best descibes the ordered pair (1,1) a)The point (1,1) is a solution for y >= 2x - 1, but not y <= 3x - 1. b) The point (1,1) is not a solution for either equation. c)The ...
May 3, 2010

algebra
Together, Jared's age and his grandfather's age total 100. But Jared's grandfather is 70 years older than him. How old is Jared's grandfather?
May 3, 2010

Chemistry
A characteristic of benzene is: C6H6 aromatic planar all of the above I think it is all of the above but I'm not sure Thank you for the assistance
May 3, 2010

Chemistry
Thank you-sorry I didn't think it was posted and I just posted it again
May 3, 2010

Chemistry
A characteristic of benzene is which of the following? C6H6 aromatic planar all of the above I think it is all of the above but I'm not sure- Thank you for the assistance-
May 3, 2010

Geometry
If I have 21.95 = r cubed, how do I find the r? Thank you
April 28, 2010

medical insurnce Billing and coding
I need a paper in apa formatt with introdution,thesis statement,outline and reference
April 27, 2010

Math
Why does the inequality sign change when both sides are multiplied or divided by a negative number? Does this happen with equations? Why or why not?
April 27, 2010

MATH
77z
April 26, 2010

MATH
Use multiplying by one to find an expression equivalent to 12/11 with a denominator of 77z. I have an entire worksheet of problems like this. Could someone please explain to me how to complete this type of problem.
April 26, 2010

Algebra2
I can't get the right answer to this problem...what am I doing wrong? (2x-4)(x+1)^2 (2x-4)(x^2+2x+2) 2x^3+4x^2+4x-4x^2-8x-8 2x^3-4x-8 but the answer I'm supposed to get is 2x^3-6x-4 what am I doing wrong? Please help! thanks
April 15, 2010

math estimate areas
estimate areas of parallelogram
April 14, 2010

Chem.
I haven't found any "Really" good ones but this is ok webclass.lakeland.cc.il.us/iali/CHM151Folder/CHM151%20OrgChm.htm
March 31, 2010

Statistics
Normally distributed means that median = mean = mode. Median = 50th percentile. Does that give you answer to a?
March 31, 2010

sms
a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the situation. x + y=56 The sales representative later ...
March 28, 2010

algebra
if e=1/1! + 1/2! + 1/3! ... and i = the sqrt(-1) then C = -(-1)^(3/4) sqrt(e) or (-1)^(3/4) sqrt(e) both being complex numbers
March 27, 2010

Math(Please help)
you get x+4
March 26, 2010

Math
For the graph of (3-x)/(5x+2)^3: is the following information right? x-intercept: (3,0) y-intercept: (0,0.375) vertical asymptote: x= -0.4 horizontal asymptote: y=0 increasing: (4.7, infinity) decreasing: (-infinity, -0.4) (-0.4, 4.7) concave up: (-0.4, 6.4) concave down: (-...
March 26, 2010

physics
the answer is
March 24, 2010

9th grade
Factorizing we get (x+2) (x+10) = 0 so x = -2 or x = -10
March 24, 2010

Math
expanding you will get 9a^4+24a^2+16 check back
March 24, 2010

math
one canned jucie drink is 15% orange jucie; another is 10% orange jucie. How many liters of each should be mixed together in order to get 5L that is 11% orange jucie? How many liter of the 15% orange jucie? how many liters of the 10% orange jucie?
March 21, 2010

art 101
Looking for an in-text citation for impressionism
March 18, 2010

Chemistry II (College)
How would I go about solving this problem? Can someone show me an equation that can be used? The decomposition of dimethyl ether at 504°C is a first-order reaction with a half-life of 27 min. (CH3)2O(g) CH4(g) + H2(g) + CO(g) What will be the total gas pressure after 2.18 ...
March 12, 2010

Chemistry II (College)
How would I go about solving this problem? Can someone show me an equation that can be used? The decomposition of dimethyl ether at 504°C is a first-order reaction with a half-life of 27 min. (CH3)2O(g) CH4(g) + H2(g) + CO(g) What will be the total gas pressure after 2.18 ...
March 12, 2010

Chemistry II (College)
How would I go about solving this problem? Can someone show me an equation that can be used? The decomposition of dimethyl ether at 504°C is a first-order reaction with a half-life of 27 min. (CH3)2O(g) CH4(g) + H2(g) + CO(g) (a) What will be the partial pressure of (CH3)...
March 11, 2010

trig
The captain of a ship at sea sights a lighthouse which is 280 feet tall. The captain measures the the angle of elevation to the top of the lighthouse to be 25. How far is the ship from the base of the lighthouse?
March 10, 2010

trig
huh?
March 10, 2010

trig
A plane is flying at an elevation of 30000 feet. It is within sight of the airport and the pilot finds that the angle of depression to the airport is 18. Find the distance between the plane and the airport. Find the distance between a point on the ground directly below the ...
March 10, 2010

calculus
How do you find the area of the intersection of the circles r=sinx and r=cosx?
March 10, 2010

Physics
A kayaker paddles with a power output of 50.0 W to maintain a steady speed of 1.30 m/s. Calculate the resistive force exerted by the water on the kayak. If the kayaker doubles her power output, and the resistive force due to the water remains the same, by what factor does the ...
March 9, 2010

12th grade
(x-2)(x+2)(x^2+4)= 0 Giving the solutions x= +2;-2;-2i;2i (i being the imaginary unit)
March 7, 2010

Sociology
What are the two social order views (contrasting) in the movie THE ISLAND (cloning)? Can someone explain to me what social order is
March 4, 2010

physics
try reading your book...
March 3, 2010

chemistry
A balloon has a volume of 2.75 liters at 25 degree celcus. What would the balloons volume be if the temperature is raised to 95 degree celcus and the pressure remains constant? please provide steps to get to answer
February 28, 2010

chemistry
If 4.57 grams of AgBr was isolated in a gravimetric analysis of a 9.30 gram sample, what is the % Br- by weight in the samples? please provide steps to get to answer
February 28, 2010

chemistry
when 50.0 ml of 2.00M KOH is reached with 50.0 ml of 2.00M HCl, the temperature rose from 20.0 degree celcus to 28.7 degree celcus. What is the heat generated by this neutralization? (Assume that the density fo the two 2 M solution is 2.00g/ml and that the heat capacity of the...
February 28, 2010

chemistry
I am still confused. If V=155 ml, T=308K, n=?, p= 1.1 atm. How do you get your R.
February 28, 2010

chemistry
How many moles of a gas are in a container with a volume of 155 milliliters at a temperature of 35 degree celcus and a pressure of 1.1 atmoshheres? Please provide steps to get answer
February 28, 2010

chemistry
If 3.51 grams of AgCl was precipitated from an unknown in a gravimetric analysis, how many grams of CL- does this represent? please explain the steps needed to get to the answer.
February 27, 2010

chemistry
Could you provide a little bit more clues i am still confused.
February 26, 2010

chemistry
Calculate the vapor pressure of water over each of the following ethylene glycol C2H6O2 solutions at 80 degree C (vp=pure water=657.6 mm Hg). Ethylene glycol can be assumed to be nonvolatile. (a) X (ethylene glycol)= 0.288 (b) % ethylene glycol by mass =39% (c) 2.42 m ethylene...
February 26, 2010

Chemistry I
a. 41.2% b. 58.8% c. 0.358 moles
February 26, 2010

Chemistry I
Acetone , C3H6), is the main ingredient of nail polish remover. A solution is made up by adding 35.0 ml of acetone (d=0.790g/ml) to 50.0ml of ethyl alchole, C2H6O (d=0.789 g/ml). summing volumes are additive, calculate (a). the mass percent of acetone in the solution. (b). the...
February 26, 2010

grade 12 chem
hi, does anyone know any good websites on practicing reactions of hydrocarbons?
February 24, 2010

grade 12 chem
hi, does anyone know any good websites on practicing reactions of hydrocarbons?
February 24, 2010

grade 12 chem
hi, does anyone know any good websites on practicing reactions of hydrocarbons?
February 24, 2010

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