Tuesday
May 31, 2016

Posts by CHARLES

Total # Posts: 356

Chemistry
Here is my work and I keep getting the hundredth value to be incorrect: 10^-4.5 = [1.8E-5 (1.8-x)]/x 10^-4.5 = [3.24E-5 - 1.8E-5]/x 10^-4.5x = 3.24E-5 - 1.8E-5x 4.96E-5x = 3.24E-5 x= 0.653
April 10, 2016

Chemistry
How do you get 0.657 mols? I solved for x and got 0.6529 mols
April 10, 2016

Chemistry
What volume of 1.0 M NaOH must be added to 1.5 L of 1.20 M CH3COOH (ka=1.8x10^-5) to make the solution a buffer for pH 4.50? I do not understand how to determine the mols of NaOH. I tried to use the equation where: [H3O+] = ka (nHA/nA-) but it is not giving me the correct ...
April 10, 2016

math
I need help making this question into a equation? A cable television company charges $15 plus $5 each for extra services and now write an equation to show how much a person would pay for television if they had x number of extra services?
April 5, 2016

chemistry
A 0.109g sample of a pure gaseous compound occupies 112ml at 100degrees and 750torr: what is the molecular weight of the compound. ANS=(30.2g,mol). Please I need the solution
March 21, 2016

Physics
A man walks 3km E and then 4km N. What is his resultant displacement?
March 8, 2016

Physics
just 20oN
March 8, 2016

Physics
An airplane is heading 20degree north flying at 200km/hr relative to the air. Simultaneously the wind carries the plane 10degree, east of south at the speed of 60km/hr. (a) find the velocity of the plane relative to the ground. (b) find the component (east and south) of the ...
March 8, 2016

Physics
Find the vector cross product of two vectors C=2i-j and D=i+2j-3k. What is the angle between the vectors
March 8, 2016

Physics
Find the magnitude of the dot product of the two vectors B=6i+j+2k, D=-1+3j. What is the angle between B and D
March 8, 2016

Physics
Consider two vectors one of magnitude 3 and the other 4 unit, which of the following is not correct? We can combine these vectors to yield a resultant of. A.7 B.5 C.1 D.0
March 8, 2016

Physics
If D=7i-3j+2k and E=4i+5j-3k. Deduce angle between D and E
March 8, 2016

Physics
If D=7i-3j+2k. Find the magnitude of D
March 8, 2016

Physics
If D=7i-3j+2k and E=4i+5j-3k. Find the scalar product of D.E
March 8, 2016

Physics
Find the sum of vectors A=5m<60degree and B=6m<130degree
March 8, 2016

Thermodynamic
One mole of CO2 is to be compressed adiabatically from 1 bar and 25 C. Because of irreversibilities and poor design of the compressor the compressor work required is found to be 25 %greater than that for a well-designed (reversible) compressor. Compute the outlet temperature ...
March 8, 2016

Physics
Am I to substitute it this way 2[5(sin2)]/9.8.? Or will I make use of tan instead, since tan=2
March 7, 2016

Physics
I don't really get you scott
March 7, 2016

Physics
A body is projected such that the horizontal range is twice the maximum height of projection. Find the angle of projection; and the time of flight if the velocity of projection is 5m/s
March 7, 2016

Physics
What is the total time of flight of an object projected vertically upwards with a speed of 30m/s? (g=10m/s^2
March 7, 2016

physics
the surface tension Y, of liquid depends on the density,P, acceleration of gravity,g, and the height, h. use the method of dimension to derive the actual relationship between these quantities
March 7, 2016

physics
a sphere of radius r moving with velocity v through a fluid experiences a retarding force f given by F=6r^yv^zn^x where n is the viscosity of the liquid. use the method of dimensions to find the values of x,y,and z.
March 7, 2016

Physics
A brass cube 2cm on each edge is held in the jaw of a wire with a force 1600N. By aw much is the cube compressed. (Y for brass is 9.1×10^10pa)
March 6, 2016

physics
The vertical and horizontal component of the initial velocity of a projectile are 36m/s and 64m/s. Find the initial velocity and angle inclination
March 6, 2016

maths
Stationery #84 000 ;sports equipments #262 000;computers #672 000; school lockers #157 500.
March 5, 2016

maths
A contractor supplied some items to a school. The contractor's bill is shown below. If each amount includes 5% VAT calculate how much the government receives as VAT. Electrical fittings = #52 500.
March 5, 2016

maths
God bless you
March 4, 2016

maths
A rectangle of length y m and breadth 4 m less than the length. What is the perimeter??
March 4, 2016

math-finance
suppose you are offered two identical jobs: one paying a starting salary of $40,000 with yearly raises of $2,000 and one paying a starting salary of $36,000 with yearly raises of $25,000. Which job will pay more over a 10 year period? I=PRT = 40,000 x 0.05 x 10 = 20,000. S = ...
February 26, 2016

math
How do find determine fractions from the greatest to least
February 22, 2016

physcis
a girl throws a ball vertically upward with a speed of 20 ft/sec from the roof of a building 60 ft high.(a)how long will it take the ball to reach the ground? (b)what will its speed be when it strikes the ground?
February 21, 2016

math
jane gets 1/2 of a gold star each time she helps her teacher clean up the classroom after class. How many times would Jane need to help her teacher to earn 3 whole gold stars? Draw fraction. Strips to help.
February 5, 2016

English
to watch
January 29, 2016

Programming Logic and Design
Design an application that accepts eight friends' first names and displays them in alphabetical order
December 3, 2015

derivrtives
Find the derivative of d^2Y/dx^2 of y=e^2t and x=cost^2 and leave your answer in terms of x and y
November 25, 2015

math
Air is pumped into a spherical balloon at the rate of 20cm^3/s^-1.find the rate of change of radius of the balloon when the radius is 6cm
November 25, 2015

probability theory
3 students; A, B and C, are in a swimming race. A and B have the same probability of winning and each is twice as likely to win as C. Find the probability that B or C wins the swimming race. 3) Given three boxes as follows: Box A contains 3 red, 2 white and 2 blue balls. Box B...
November 20, 2015

English
if you want to say he left the stage then your answer should be "He disappeared from stage"..... else both are correct with different meanings..
November 20, 2015

chem
How would your experimental formula of magnesium chloride “MgClx” have been affected if your product was not dried completely before weighing it? Would “x” be too high or two low?
October 28, 2015

Biology
Some people experience “heartburn” when eating fatty, greasy foods (similar to the effect that is felt when eating acidic foods). Why would this occur with fats? I know fatty acids are made of carboxylic acid and if you have too much, would it make sense to say that ...
October 27, 2015

PHYSICS
An automobile accident causes both the driver and passenger front airbags to deploy. a. If the vehicle travelled at a speed of 88.6 km/h is now at rest, find the change in momentum for both the 68.4 kg adult driver and the 34.2 kg child passenger. b. The adult took 0.564 s and...
October 24, 2015

Combinations and Permutations
A committee of 3 members is selected from a club made up of 10 junior members and 20 senior members. What is the expected number of juniors in the committee?
October 4, 2015

Science
The solubility of a compound in water is 6.8g/100ml at 25°C.. Calculate the amount of water required to crystallize 10g of the compound. If the pure compound is collected at 25°C what is the maximum possible yield percent.
September 21, 2015

life science
investigation to determine whether expired air contains carbondioxide
September 6, 2015

Math
A toy company manufactures miniature cars. They sell miniature sports cars in a box. They sell 12 miniature trucks in a box. Mrs. Murphy wants to buy an equal number of sports cars and trucks for the Boys and Girls Club. What is the least number of miniature sports cars she ...
August 16, 2015

maths
A box contains 5 red bowls, 6 yellow bowls and 3 white bowls. If 4 bowls are randomly drawn from the box at the same time, (a)find the probability that exactly 2 red bowls are drawn; (b)find the probability that at least 2 red bowls are drawn.
July 23, 2015

math
A box contains 5 red bowls, 6 yellow bowls and 3 white bowls. If 4 bowls are randomly drawn from the box at the same time, (a)find the probability that exactly 2 red bowls are drawn; (b)find the probability that at least 2 red bowls are drawn. My work: (a) (5/14)^2(6/14)(3/14...
July 22, 2015

Statistics
6739.2
June 7, 2015

physics
consider a vertical piston system. the piston has a 50g mass and a given radius of 3mm. what amount of pressure does the piston exert? ( use g==9.8 m/s^2 )
June 2, 2015

math
what is the surface area of a cube with sides measuring 2 inches?
May 14, 2015

Managerial Economics
1. A principal-agent problems occur when managerial decisions are not consistent with the firm's shareholders' interests. T 2. A firm making more than a normal profit may still be experiencing an economic loss. T 3. An inferior good is a good whose demand decreases as ...
May 13, 2015

english
Choose the correct sentence pattern for the sentence below. I hereby declare Tuesday Shakespeare Day.
April 19, 2015

Chemistry
What volume of carbon tetrachloride (density = 2.71 g/mL) contains 2.46x10^25 chlorine atoms? I did: 2.46x10^25 Cl atoms x 1 atom/4 atoms x 1 mol/6.02x10^23 x 154 g/1 mol x 1 mL/2.71 g And the correct answer is apparently 572 mL when I got 581 mL.
March 29, 2015

Chemistry
but how do you get the right amount of mL? I did: 2.46x10^25 Cl atoms x 1 atom/4 atoms x 1 mol/6.02x10^23 x 154 g/1 mol x 1 mL/2.71 g And the correct answer is apparently 572 mL when I got 581 mL.
March 29, 2015

Chemistry
What volume of carbon tetrachloride (density = 2.71 g/mL) contains 2.46x10^25 chlorine atoms?
March 29, 2015

Chemistry
If 84.1 g of sodium hydroxide are reacted with 51.0 g of aluminum in the following equation: 2NaOH + 2Al + 2H2O --> 2NaAlO2 + 3H2 a) what mass of excess reactant remains? b) what mass of water would react?
March 28, 2015

Physics
A baseball player leads off the game and hits a long home run. The ball leaves the bat at an angle of 30.0o from the horizontal with a velocity of 40.0 m/s. How far will it travel in the air? Working out please
March 17, 2015

math
I don't know or get it can show me how yougot the answer?
February 10, 2015

Maths
e) A fair coin is tossed 6 times. What is the probability of getting exactly 2 heads? What is the mean of this experiment?
February 7, 2015

Math
I have 14 hundreds, 16 tens and 9 ones. What number am I?
February 4, 2015

Math
yes please
January 22, 2015

Math
yes I am ask for an example please Ms.sue
January 22, 2015

Math
The winner of a raffle will receive 3/4 of the 530.40 raised from raffle ticket sales
January 22, 2015

Math
Delia has 493 stamps in her stamp collection. She can put 16 stamps on each page of an album. How many pages can she fill completely?
January 21, 2015

GRANTHAM
Find the present value of the ordinary annuity. Please round the answer to the nearest cent.$2,000 per semiannual period for 7 yr at 12%/year compounded semiannually
December 30, 2014

Math
I can't. This is how my math teacher put in the question. Its confusing, right? Its just messed up. I was just hoping if someone can plug in the fraction. If I saw how it looks when its all plugged in I might get it.
December 18, 2014

Math
The denominator of a fraction is one more then the numerator. If 2 were added to both the numerator and denominator, the new fraction equals 4/5. Find the original fraction.
December 18, 2014

Cardiovascular Respirtory
In which condition is the patient most likely to hemorrhage? A. Thalassemia B. Erythroblastosis fetalis C. Thrombocytopenia D. Polycythemia
December 17, 2014

Chem
(V1/n1)=(V2/n2) (5.12÷7.51)=18.3÷n2 n2=26.84mol
December 10, 2014

physics
A 75-g piece of aluminum at 89 °C is dropped in 1.0 L of water at 1.3 101 °C, which is in an insulated beaker. Assuming that there is negligible heat loss to the surroundings, determine the equilibrium temperature of the system
December 8, 2014

math
Gina's art teacher mixes 9 pints of yellow paint with 6 pints of blue paint. Did Gina use the same ratio of yellow paint to blue paint instructed by her teacher.
December 7, 2014

math
taryn and alastair both mow lawns. Each charges a flat fee to mow a lawn. The table shows the number of lawns in the past week, the time spent mowing lawns and the money earned. Taryn mowed 9 lawns. She spent 7.5 hrs mowing lawns. Taryn earned $112.50 Alastair mowed 7 lawns. ...
December 3, 2014

math
or is this right? 1/3 * 9/7 =7/21 * 27/21 =189/21 =9
November 23, 2014

math
1/3 / 7/9 =1/3 * 9/7 =9/21 is this right??
November 23, 2014

math
thanks! practice will make perfect. thanks for helping me.
November 23, 2014

math
1 3/5 - 5/6 =8/5 - 6/5 =2/5 or is it =1/3/5 - 5/6 =48/30 - 25/30 =23/30 I don't know which one is right. Pleas e help!
November 23, 2014

math
Yay!
November 23, 2014

math
so..... 3/8 + 5/2 =3/8 + 20/8 =23/8 =2 7/8 is this right?
November 23, 2014

math
3/8 + 2 1/2 =3/8 + 5/2 =8/10 =4/5
November 23, 2014

math
yeah!!!!! I love you!!!! So happy. :-)
November 23, 2014

math
so....... 5/7 * 9/10 =45/70 =9/14 is this right???
November 23, 2014

math
5/7 *9/10 =63/70 =9/10
November 23, 2014

math
so...... 5/7 * 9/10 =45/70 =9/14 Did I get it right?
November 23, 2014

math
5/7 * 9/10 = 50/70 * 63/70 =3150/70 =45
November 23, 2014

math
Thanks, I always get confuse.
November 23, 2014

math
4/5 * 3/4 = =16/20 * 15/20 =240/20 =12 is this right?
November 23, 2014

math
A jar contains 133 pennies. A bigger jar contains 1 2/7 times as many pennies. What is the value of the pennies in the bigger jar
November 23, 2014

Advanced Finance
6. (TCO F) Suppose the December CBOT Treasury bond futures contract has a quoted price of 80-07. What is the implied annual interest rate inherent in the futures contract? Assume this contract is based on a 20-year Treasury bond with semiannual interest payments. The face ...
November 21, 2014

decimals
Hi Teshea. Thanks for your help. But one question though......you said "now multiply the whole no# by the denominator 2x24=48, then divide 48/35, it gives you a decimal 1.371428571n the answer is 1.371.But I thought that when you multiply the whole number by the ...
November 18, 2014

decimals
Mark wants to paint a mural. He has 1 1/3 gallons of yellow paint, 1 1/4 green paint, and 7/8 gallon of blue paint. mark plans to use 3/4 gallon of each paint color. How many gallons of paint will he have left after painting the mural?
November 18, 2014

math
Melina walked her dog 2 1/5 miles. Cathy walked her dog 1 3/4 times as far as Melania did. How many more miles did Cathy walk her dog?
November 15, 2014

Physics
A 1000 kg Toyota, initially traveling at 40 mph, collides into the rear end of a 2000 kg Cadillac, initially stopped at a red light. The bumpers lock and the two cars skid for 2 seconds before coming to rest. Calculate the coefficient of kinetic friction between the tires and ...
November 2, 2014

Science
Use the formula, that will help you out.
September 26, 2014

Science
spring scale
September 14, 2014

math
In order to pass a physical education class at a university, a student must run 1.0 mi in 12.5 min. After running for 10.0 min (assume constant speed), she still has 510 yd to go. What constant acceleration does she need over the final 510 yd in order to make it?
September 14, 2014

Physics
Just saw the flaw. -2.5 in vector B should be -3.5. This has had me stuck for too long.
August 30, 2014

Physics
Thank you for that. I don't understand the rule for "Cy/Cx = 5/6.5; if Cx = 6.5k, then Cy = 5k." I also realize that your solution doesn't match my book's solution. Here's the step by step from the book that I'm not understanding either, perhaps ...
August 30, 2014

Physics
You are given vectors A = 5.0i - 6.5j and B = -2.5i + 7.0j. A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of C with B is 15.0. Find the x and y components to vector C. Answer key shows x component is 8.0, y component is 6.1...
August 30, 2014

chemistry
In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. If you burn 54.8 g of hydrogen and produce 4.90 × 10^2 g of water, how much oxygen reacted?
August 29, 2014

chemistry
In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. If you burn 54.8 g of hydrogen and produce 4.90 × 102 g of water, how much oxygen reacted?
August 29, 2014

  1. Pages:
  2. 1
  3. 2
  4. 3
  5. 4
  6. Next>>