Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 301

**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*

**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*

**English 11**

Regionalism is a form of Realism that emphasizes realistic settings, using local dialect, customs, and other specific details of a place. Identify the regional stories in Unit 4. What part of the country is portrayed, and which details in the story distinguish it from other ...
*January 6, 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*

**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**

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*

**Physics**

A stone projected vertically upward with a speed of 30ms from the top of a tower of height 50m neglecting the air resistance.determine the maximum height it reach from the ground
*August 5, 2014*

**Math**

A homeowner is laying sod in her lawn. The lawn is a rectangle with dimensions of 28'*18'. If one piece of sod is a rectangle with dimensions of 60 cm*40 cm, approximately how many pieces of sod should the homeowner order?
*July 18, 2014*

**physics**

With brakes fully applied, a 1370 kg car deccelerates from a speed of 98.0 km/hr. What is the work done by the braking force in bringing the car to a stop?
*July 11, 2014*

**physics**

A force of 1.57 N pushes against an object with a mass of 0.16 kg for 3.00 min. The object does not move. What is the work done on the object by the force?
*July 11, 2014*

**chemistry**

What is the mass of water obtained when mix 100.0 mL of 2.5 M. HNO3 with 100.0 mL of 2.55 M. KOH?
*July 8, 2014*

**chemistry**

Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 x 10-3 M/atm.
*May 26, 2014*

** math**

f (x) = (50-w) (75-w)?
*April 25, 2014*

**algebra**

how many{distinct letters in the word food}
*April 11, 2014*

**algebra**

{distinct letters in the word food}
*April 11, 2014*

**physic **

If wind blows at 34m/s over a house, what is the net force on the roof if its area is 170m2 and is flat? (At 20 ∘ C dry air has a density of 1.2 kg/m3).
*April 7, 2014*

**physic **

A 69-cm-diameter wheel accelerates uniformly about its center from 150rpm to 320rpm in 4.4s . Determine angular acceleration?
*March 29, 2014*

**Physic **

Calculate the mass m needed in order to suspend the leg shown in the figure(Figure 1) . Assume the leg (with cast) has a mass of 15.5kg , and its CG is 35.5cm from the hip joint; the sling is 76.5cm from the hip joint.
*March 29, 2014*

**Physical Science**

The air temperature on a certain day is 86 degrees F A)Convert to Celsius? B) Calculate the sound of speed in air? C)When a 653Hz tornado siren is turned on, the sound takes 2.3s to reach an observer. How far is the observer from the main siren, and what is the wavelength of ...
*March 2, 2014*

**Physical Science**

An ultrasonic wave in water is a compression wave that travels at 1,400 m/s A) An ultrasonic wave from a ship travels to the bottom of a lake and back in 0.16s. How deep is it at this point? B) If an ultrasonic wave is emitted in the ocean where the ocean's depth is 3.5km...
*March 2, 2014*

**statistics**

20-8+1=13
*December 26, 2013*

**Chemistry**

Can someone please help me answer these questions? Is additional information other than what is given needed to solve? Thanks in advance. 1) Calculate the PH of a buffer containing 0.100 M propanoic acid, HC3H5O2 and .100 M NaC3H502 after the following have been added. Ka for ...
*December 13, 2013*

**English**

We heard tommy's loud drumming clearly despite the _______ of the elementary school band practice. A. Esprit B. Concordance C. Animadversion
*October 28, 2013*

**science**

I am doing a titration lab and need help with a problem. (i used .100M H2SO4)(I used 10.0 ml of Ba(OH)2 solution and added 50.0 ml of distilled water making 60.0 ml total.) 1. Use the titration results to calculate the moles of H2SO4 that were used to reach the equivalence ...
*October 12, 2013*

**College Algebra**

Express 0.000093 in scientific notation. Can anyone help?
*September 8, 2013*

**physics**

determine the pressure of a 20 lb force is applied to an area of 10 inch squared
*September 7, 2013*

**physics**

determine the pressure of a 20 lb force is applied to an area of 10 inch squared
*September 7, 2013*

**Physics**

“Strontium-90 is a pure beta source.” How could a physicist test this statement? I am stuck on this one, but I was thinking through measurement of radioactivity.
*August 30, 2013*

**Reading**

Is the main characher in Football Futigive more like an equilateral isosceles or scalene?
*August 28, 2013*

**math**

Dents and Dings Auto Body buys paint with a list price of $29,000. If the supplier extends trade discounts of 30/35/20, what is the trade discount amount?
*August 24, 2013*

**economics**

In the simple economics of a competitive market price increases under which condition?
*August 14, 2013*

**General Physics**

A 4 kg block slides along a frictionless horizontal with a speed of 5.1 m/s. After sliding a distance of 7 m, the block makes a smooth transition to a frictionless ramp inclined at an angle of 13 degrees to the horizontal. The acceleration of gravity is 9.81 m/s2. How far...
*July 26, 2013*

**General Physics**

A 0.377 kg bead slides on a curved wire, starting from rest at point A(4.8 meters) as shown in the figure. The acceleration of gravity is 9.8 m/s2 . A. If the wire is frictionless, find the speed of the bead at B(0 Meters). Answer in units of m/s B. Find the speed of the bead ...
*July 26, 2013*

**General Physics**

A block sliding on a horizontal surface has an initial speed of 0.5 m/s. The block travels a distance of 1 m as it slows to a stop. What distance would the block have traveled if its initial speed had been 1 m/s? 1. 2 m 2. 1 m 3. more information is needed to answer the ...
*July 26, 2013*

**General Physics**

Suppose that the force on the block FT is increased so that the block accelerates (starting from rest) at a = 2.2 m/s2. Now what is the net work done by all the forces acting on the block as it moves a distance of 15 m? 1. Wnet = −1968.75 J 2. Wnet = 1155 J 3. Wnet = ...
*July 26, 2013*

**General Physics**

A 35 kg block is pulled at a constant speed along a horizontal surface by a rope with tension FT . The rope is inclined at an angle from the horizontal as shown. The block moves a distance 15 m along the horizontal surface. What is the net work done by all the forces acting on...
*July 26, 2013*

**General Physics **

A force Fx acts on a particle. The force is related to the position of the particle by the formula Fx = (5.9 N/m3) x3. Find the work done by this force on the particle as the particle moves from x = 0.9 m to x = 22 m. Answer in units of J
*July 26, 2013*

**General Physics **

A spring with spring constant of 28 N/m is stretched 0.2 m from its equilibrium position. How much work must be done to stretch it an additional 0.06 m? Answer in units of J
*July 26, 2013*

**General Physics **

A 7453 N piano is to be pushed up a(n) 4.04 m frictionless plank that makes an angle of 25.9 with the horizontal. Calculate the work done in sliding the piano up the plank at a slow constant rate. Answer in units of J
*July 26, 2013*

**General Physics 1**

A force ~F = Fx ˆý+Fy ˆ| acts on a particle that undergoes a displacement of ~s = sx ˆý + sy ˆ| where Fx = 10 N, Fy = −4 N, sx = 6 m, and sy = 1 m. 1. Find the work done by the force on the particle. Answer in units of J 2. Find the ...
*July 26, 2013*

**General Physics 1**

A simple Atwood's machine uses a massless pulley and two masses m1 and m2. Starting from rest, the speed of the two masses is 4.8 m/s at the end of 5.5 s. At that time, the kinetic energy of the system is 33 J and each mass has moved a distance of 13.2 m. 1. Find the value...
*July 26, 2013*

**liberal art math**

slope intercept form of x + 3y + -6
*July 7, 2013*

**Physics**

I don't understand the flow in the math here. Please help me understand this solution by "dumbing it down" a bit.
*June 23, 2013*

**chemistry**

Calculate the mass in grams for a sample of water that absorbs 8200J when its temperature rises from 20.4∘C to 93.8∘C.
*June 21, 2013*

**Finite Mathematics**

16,252.06
*June 6, 2013*

**Math**

How do I identify the initial value and the growth or decay for these problems? a) Q=25000 x (1/2)^t b) y=350 x 5* c) N=5000 x (9/10)^t
*May 15, 2013*

**Chemistry**

Determine the theoretical and percent yield of hydrogen gas if 78.5 g water undergoes electrolysis to produce hydrogen and oxygen and 3.23 g hydrogen is collected.
*May 11, 2013*

**L.O**

5 ways in which the human or enviromental problem impacts on the community.
*April 10, 2013*

**chemistry**

A generic salt, AB, has a molar mass of 293 g/mol and a solubility of 2.20 g/L at 25 °C. What is the Ksp of this salt at 25 °C?
*March 26, 2013*

**chemistry**

A generic salt, AB, has a molar mass of 293 g/mol and a solubility of 2.20 g/L at 25 °C. What is the Ksp of this salt at 25 °C?
*March 26, 2013*

**Chemistry**

I only need help with parts c) and d)
*March 23, 2013*

**northrise university**

What is natural law?
*March 20, 2013*

**math**

what is the speed of a runner who can run 400 metre in 76 seconds
*March 19, 2013*

**college algebra**

An advertising agency conducted a survey and found that the number of units sold, N, is related to the amount a spent on advertising (in dollars) by the following formula: N = 6,500 + 200 ln a (a ¡Ý 1) How many units are sold after spending $1,000? (Round your ...
*March 8, 2013*

**Math**

Elbert wants to plant grass seed in his backyard. His yard is shaped like a rectangle that is 6 meters by 7 meters. He plans to use a cup of seed for every square meter in his yard. How many cups of grass seed will he need?
*February 28, 2013*

**Math**

Serena has a square-shaped garden. She wants to put a fence around the outside of the garden. One side of the garden is 8 feet long. How many feet of fence will she need?
*February 28, 2013*

**math**

What is the PROCUREMENT cost of this system? Cost Types Cost (in millions) Research/Development $400 Procurement of Prime mission $800 Procurement of support equipment $100 Procurement of Initial Spares $100 Operations & and Support $70,000 Disposal $100 ANWERS! (A). 800 ...
*February 15, 2013*

**Math**

Figured it out 5 cents
*February 14, 2013*

**Math**

A mother of triplets wants to buy gum balls the machine has two colors how much will it cost to get three gum apps the same color ?
*February 14, 2013*

**math**

1.As the 1st quantity increases, the 2nd quantity also increases. 2.As the 1st quantity increases, the second quantity decreases.
*February 6, 2013*