Monday

May 30, 2016
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*