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October 23, 2014

Posts by Chris


Total # Posts: 2,210

math
a bag contains 12 black checkers and 12 red checkers. What is the probability of choosing two red checkers?
January 23, 2011

Chemistry
thank you so very much this helped so much!!!!!
January 23, 2011

Chemistry
What is the pH of a one liter auqueous solution to which has been added 0.2 moles of acetic acid (CH3COOH)?
January 23, 2011

5th grade
Easily done the mode is 600 b/c the mode is the most #'s in the sequence
January 20, 2011

physicis
what action on our part is neccesary to make the dryiceblock move faster and faster,that is accelerate continuosly?if you are speeding it up, how must you move?
January 20, 2011

physicis
suppose the dry ice block is moving to begin with and we exert a steady force,either speeding up or slowing down.how does the block behave? now suppose we make the steady force smaller and smaller.how does the dryice block behave? how will it behave when the force we are ...
January 20, 2011

physicis
What is dry ice behavior when acted on by a steady push that keeps up with the block and when it is a given a quick shove.
January 20, 2011

trig
i have to find a & c, b=2.489*10 to the nineth power and i have one degree 25
January 18, 2011

thermodynamic
A heat pump is proposed that uses 50 degree F ground water to heat a house to 70 Degree F. The groundwater experiences a temperature drop of 12 degree F. If the house require 75,000 Btu/hr, Calculate the minimum mass flux of the groundwater and minimum HP required for the pump.
January 16, 2011

thermodynamic
Calculate the work necessary to compress air in an isolated cylinder with initial and final volumes of 6.0 and 1.2 ft^3, respectively. The initial pressure and temperature are 30.0 psia and 50 degree F, respectively.
January 15, 2011

thermodynamic
An air tank with a volume of 20m^3 is pressurized to 10 MPa. The tank eventually reaches room temperature of 25 degree C. If the air inside is allowed to escape without any heat transfer to the environment unit reaches a pressure of 200 KLPa, find the remaining mass of air in ...
January 15, 2011

Early ed
The most important consideration when installing playground equipment is? A. Cost B.height C.finishing materials D. Surface materials
January 12, 2011

Conductivity
I still don't understand. Can someone help, and elaborate more?
January 12, 2011

Trigonometry
If log base 9 of 2 = 3x+1, find x to the nearest tenth.
January 12, 2011

algebra
simplified x/2-1/3=1/2
January 12, 2011

Algebra 2
10x+ (x^2) = 42
January 10, 2011

Math
Paul's car is 14 feet long. Paul is making a model of his car that is the actual size. Which proportion should be used to find the length, L, of Paul's model?
January 10, 2011

Thermodynamic
One Kg steam with a quality of 0.2 is heated in a piston / cylinder vessel at a constant pressure of 200 KPa unit the temperature reaches 400 degree C. calculate the work done by the steam.
January 10, 2011

Thermodynamic
N2 is described by its state properties of temperature @ - 100 Degree C, and pressure @10.0 MPa. Determine if it is reasonable to assume that the given substance behaves as an ideal gas at the specified state. If the substance is determined as a real gas or non-ideal substance...
January 10, 2011

MATH!! probability
Two cards are drawn without replacement from a deck of 52 cards. Determine P(A and B) where A : the first card is a spade B: the second card is a face card please help!!
January 9, 2011

thermodynamic
The air 10 cm diameter cylinder, as shown below, is heated until the spring is compressed 50mm. Find the work done by the air on the frictionless piston. The spring as the beginning of this process has a displacement of 0.0m with a spring constant of K=10KN/m. (assume Patm=101...
January 9, 2011

accounting
What potential problems can arise if a company incorrectly classifies costs? Example, what if an inventoriable cost is classified as a period cost?
January 9, 2011

thermodynamic
The air 10 cm diameter cylinder, as shown below, is heated until the spring is compressed 50mm. Find the work done by the air on the frictionless piston. The spring as the beginning of this process has a displacement of 0.0m with a spring constant of K=10KN/m. (assume Patm=101...
January 9, 2011

thermodynamic
Energy is added to a piston-cylinder arrangement. The piston is withdrawn in such a way that the temperature remains constant. The initial pressure and volume are 200 KPa and 2m^3, respectively. If the final pressure is 100 KPa, determine the work done by the ideal gas on the ...
January 9, 2011

Physics
The mass of the hockey puck is 185 grams. When you said time = distance/average speed stopping, in the equation F = m (46.473)*(23.236/.0439), did you mean this, .0439/23.236.
January 8, 2011

Physics
A player strikes a hockey puck giving it a velocity of 47.673 m/s. The puck slides across the ice for 0.175 s after which time its velocity is 46.473 m/s. The acceleration of gravity is 9.8 m/s2 . If the puck strikes the goalie’s pads and stops in a distance of 4.39 cm, ...
January 8, 2011

thermodynamic
N2 is described by its state properties of temperature @ -100 degree C, and Pressure @ 10.0 MPa. Determine if it is reasonable to assume that the given substances behaves as a real or non-ideal substance determine its compressibility factory Z.
January 8, 2011

thermodynamice
A cylinder contain 3 kg of water and water vapor mixture in equilibrium at a pressure of 500 KN/m^2. If the volume of the cylinder is 1.0 m^3, calculate the following. A)temperature of the mixture B) the volume and mass of the liquid C)The volume and mass of the vapor
January 8, 2011

Physics
You are driving at the speed of 33.4 m/s (74.7296 mph) when suddenly the car in front of you (previously traveling at the same speed) brakes. Considering an average human reaction, you press your brakes 0.484 s later. Assume that the brakes on both cars are fully engaged and ...
January 8, 2011

Physics
You are driving at the speed of 33.4 m/s (74.7296 mph) when suddenly the car in front of you (previously traveling at the same speed) brakes. Considering an average human reaction, you press your brakes 0.484 s later. Assume that the brakes on both cars are fully engaged and ...
January 8, 2011

english
I need help determining the key differences between the four types of writing (summary, analysis, synthesis and evaluation).
January 8, 2011

7th grade math
6+x=2x-14 -x = -x 6=x-14 6+14=+14 20=x
January 6, 2011

Science
what forces would be at work if you were trying to move a 20,000kg block of stone? Withoust using a cart or truck, how could you move the stone?
January 5, 2011

English 1
Underline the correct pronoun of each pair in parentheses. 1. Women (who, whom) raise families do as much work at home as at their jobs. Whom 2. In North America society, it is still mainly women (who, whom) cook dinner, clean the house, check the children’s homework, ...
January 4, 2011

geometry
If the smaller leg of a 30-60-90 triangle is 4 m, what are the lengths of the longer leg and the hypotenuse?
January 2, 2011

English 1
Revise the mixed sentences so that the beginning of each sentence fits logically with its end. If sentence is correct cirle it. 4. While following an object with her eyes is when eye coordination develops When following an object with her eyes is when eye coordination ...
December 31, 2010

English 1
Revise the mixed sentences so that the beginning of each sentence fits logically with its end. If sentence is correct cirle it. 1. By showing babies plain, black-and-white images will help them learn to recognize shapes and focus their vision. Showing babies plain, black-...
December 31, 2010

English 1
Revise the mixed sentences so that the beginning of each sentence fits logically with its end. If sentence is correct cirle it. 1. By showing babies plain, black-and-white images will help them learn to recognize shapes and focus their vision. 2. Babies can see their parents&#...
December 31, 2010

English (Shifting and mixed sentences)
1. By showing babies plain, black-and-white images will help them learn to recognize shapes and focus their vision. 2. Babies can see their parents’ faces but will not respond with a smile until they are a few weeks old. 3. Babies may gaze intently into a small, ...
December 30, 2010

English 1
Through changing his facial expression indicates he may find a particular sound soothing or comforting.
December 30, 2010

5th grade
divide 6358 by 100
December 27, 2010

pre calculus
Write the trigonometric expression in terms of sine and cosine, and then simplify. cot(x)/csc(x)-sin(x)
December 16, 2010

geometry
if triangle FGH~ to Triangle PQR, FG = 6, PQ = 10 and the perimeter of trinagle PQR is 35 find the perimeter of triangle FGH
December 13, 2010

us history`
township
December 12, 2010

English
Thanks that makes since to be now. Let me try a few more that can be either just to make sure I understand. 1.All of the actors (knows, know) their lines. 2. Most of the plants (needs, need) water. 3.Now more of the waiters (seems, seem) busy. 1.plural=know 2.plural=need 3....
December 8, 2010

English
Can you please explain how none is singular in sentence #1? I know that all, any, more, most, none, and some may be either singular or plural, depending on their meaning in a sentence.
December 8, 2010

English
1.plural=has 2.singular=is
December 8, 2010

English
1. None of the guests (has, have) left. 2. Each of these apples (is, are) ripe. 3.One of my favorite songwriters (is, are) Billy Joel. 4.Some of my cousins (has, have) come to my party. 5.All of the bread (was, were) eaten. Tell if the indefinite pronoun is singular or plural ...
December 8, 2010

English
1.Everyone in the club (has, have) read this book. 2.Most of the field (needs, need) mowing. Tell if the indefinite pronoun is singular or plural. Then choose correct word in () 1.singular=has 2.singular=needs
December 8, 2010

5th grade
Ther is no mode
December 8, 2010

math
60 boys 80 girls
December 7, 2010

algebra
The natural stride up a certain staircase has a slope of 3/5, meaning that a run of 5 inches has a rise of 3 inches. The model for a standard staircase is y=(3/5)x Find the rise for a staircase constructed at a mansion which has a run of 12 inches. Not sure how to set equation up
December 7, 2010

Chemistry
A 0.5962g sample of iron ore is dissolved in acid producing Fe3+. Through a series of reactions, the iron precipitates as the Fe(OH)3. The precipitate is heated, forming solid Fe2O3. What is the mass % of iron in the sample if the analysis produced 0.3210g Fe2O3?
December 6, 2010

11th grade
From what i see your trying to convert 4000 grams of fe203 to moles, and then multiply the find the amount of fe203 in 3 moles of co2. So your answer would be 4000*3/ 159.68 = 75.2 mole of co2 .
December 2, 2010

English
1.He lived with his parents, brothers, and sisters. 2.Those in this small Mexican American community were worried and frightened. 3.That was the time when Cesar Chavez first lived among the migrant workers. 4.Chavez became a spokesperson for poor farmworkers. 5.In 1962, he ...
November 30, 2010

5th grade math
The number of pages is a 2-digit number. the number of photos on a page is a 1- digit number. the number of pages is 60 more than the number of photos on a page. the number of pages is divided by the number of photos on a page is 16. What is the number of pages?????????
November 30, 2010

English
1.Throughout his life, Chavez focused on nonviolent action. 2.He organized several boycotts of grapes and lettuce. 3.In California there was work for farmworkers if they could go from one farm to another. 4.In 1937, Cesar Chavez's family did not have enough money for the ...
November 30, 2010

math
the number of pages is a 2-digit number. the number of photos on a page is a 1- digit number. the number of pages is 60 more than the number of photos on a page. the number of pages is divided by the number of photos on a page is 16. What is the number of pages?????????
November 30, 2010

math
the number of pages is a 2-digit number. the number of photos on a page is a 1- digit number. the number of pages is 60 more than the number of photos on a page. the number of pages is divided by the number of photos on a page is 16. What is the number of pages?????????
November 30, 2010

Physics
A ball thrown horizontally at 18.3 m/s from the roof of a building lands 36.3 m from the base of the building. How tall is the building?
November 30, 2010

Algebra
Question: Looking below is this answer correct? If you follow the math, you reach the entire population before 8 hours have passed yet the solution says 8.86 hours.... Is the solution giving us the numbers in the set and not the actual elapsed hours??? Does anyone know why? ...
November 30, 2010

algebra
what is slope and y intercept for y=22.048x-19.464
November 28, 2010

7th grade math
SA=2pi(4 squared) + 2pi (4)(20)
November 26, 2010

7th grade math
30 = 12d
November 26, 2010

ALGEBRA
Thank you, i was checking my answer.
November 21, 2010

ALGEBRA
Express as a single logarithm and simplify: log x – log (8x) + 2 log 4
November 21, 2010

trig
find exact value cos(13pi/15)cos(-pi/5)-sin(13pi/15)sin(-pi/5)
November 18, 2010

trig
find exact value using sum or differnce equations. tan(19pi/12)
November 18, 2010

pre-algebra (interests & percentss)
$21.60
November 18, 2010

statistics
When a card is selected from a deck, find the probability of getting a diamond, a face card or a diamond, or a club and a king?
November 18, 2010

physics
an atwoods machine has a solid cylindrical pulley with a mass of 200g and a radius of 10cm. a 1.2 kg mass is hung on one side and a 1.1kg mass on the other side, find the acceleration of the two masses and the itme for them to travel a distance of 60cm
November 17, 2010

chemistry
A sample of a gas occupies a volume of 1158 mL at 59ºC and 0.76 atm. What would be the new volume if temperature decreases to 40ºC and pressure increases to 1.40 atm?
November 17, 2010

Science: Chemistry
A sample of a gas at 0.73 atm occupies a volume of 245 mL. If the temperature remains constant, what will be the new pressure if the volume increases to 633 mL?
November 17, 2010

physics
P fluid=r x h x g wher h =3.4m P total =P atmospheric + P fluid Normal atmospheric pressure = 1.01 x 10^5
November 16, 2010

organic chemistry
What is the product of reaction of triphenylmethanol heated up with 40% HI in glacial acetic acid and then treated with sodium bisulfite?
November 16, 2010

English
1.The castanets, which were quite old, had been Melanie's grandmother's. 2.You were always singing when you were little. 3.Three Indian elephants patiently towed the logs that had just been cut. 4.Stay with us as long as you want. 5.The Forbidden City, where China'...
November 16, 2010

English
1.Camels stamped and bellowed in annoyance when packs were put on them. 2.Aloe plants, which originated in Africa, are now widely available in the US. 3.As far as scientists can tell, there is no connection between these two events. 4.If you adjust the blinds, you won't ...
November 16, 2010

Thermochemistry Ap Chem homework
i used the formula m(delta T)Cp=delta H (10.0)(20.0-0.00)= x and so x = 200... is that correct, if so would the units be degrees celcius?
November 15, 2010

Thermochemistry Ap Chem homework
Any help would be great, even if it is just a way to start or a formula. Calculate the heat necessary to convert 10.0 g of water (just melted) at 0 degrees Celcius to water at 20 degrees Celcius, assuming that the specific heat remains constant at 1 cal/gram degrees celcius.
November 15, 2010

algebra
ãx8y5
November 15, 2010

algebra
need to find square root 292
November 14, 2010

College algebra
Solve for z 4(4-2z)+1=7(x+2(1-z))
November 14, 2010

algebra
determine the distance betwen the two points (5,12) and (11,-4)
November 13, 2010

Chemistry
Reacting Potassium carbonate with Barium chloride
November 12, 2010

science
what was the acceleration of an object between 8 and 10 seconds if velocity at 8 seconds is 10 mi/hr and 0 mi/hr at 10 seconds?
November 12, 2010

7th grade math
find a ratio equivalent to the ratio 7 over 9 then use the ratio to write a proportion
November 11, 2010

English
1.The Reverend Jesse Jackson spoke at the convention. 2.I wear heavy wool socks under my hiking boots. 3.Joel and Tina are participating in the Special Olympics. Identify prepositional phrase, tell if adj or adverb phrase then word that phrase modifies 1.at the convention-...
November 8, 2010

physics BASIC PLEASE HELP
Calculations and Data: Angle: As measured by protractor:7.63 degrees As measured by using inverse sin:7.4 degrees Percent error: ((True value-experimental value)/true value))*100= ((7.4-7.63)/7.4)*100=-3.1081% Time: 1.53s 1.4s 1.53s 1.44s 1.47s Average time= (total of times ...
November 8, 2010

English
2.rode 3.something 5.just
November 8, 2010

English
1.The hikers are ready for a break. 2.Yesterday we rode our bikes through the park. 3.That store has something for everyone. 4.Students from both South America and North America attended the meeting. 5.According to the map, Tony's farm is just ahead. Identify prepositional...
November 8, 2010

12th grade
if cos Q=5/9, find 5/9
November 8, 2010

Math
Ashley can ride her bike to work in 2/3 of an hour. When she drives to work it takes 1/3 of an hour. If she drives 12 miles per hour faster than she rides her bike, how fast does she ride her bike?
November 7, 2010

Physics
A jet pilot is in a vertical loop. If the jet is moving at a speed of 1300 km per hour at the lowest point of the loop determine the minimum radius of the cirlce so that the centripetal acceleration at the lowest point does not exceed 6.0g's.
November 7, 2010

Physics
I just need help with c A long horizontal hose of diameter 4.2 cm is connected to a faucet. At the other end, there is a nozzle of diameter 2 cm. Water squirts from the nozzle at velocity 24 m/sec. Assume that the water has no viscosity or other form of energy dissipation. a) ...
November 6, 2010

math
a computer company can sell 1000 computers if they price them at $500. The number sold will increase by 10 for every 1$ decrease in the price. The company has fixed cost of $100,000, and each computer costs $300 to produce. Find the price that will maximize the company's ...
November 4, 2010

English
I have to add prepositional phrases to the following sentences. Please check to see if correct. 1.The carpenter repaired the roof. 2.The coach explained the play. 1.The carpenter repaired the roof in the house. 2.The coach down the street explained the play.
November 3, 2010

Chemistry
In calibrating a thermometer by setting only the freezing and boiling points, what assumptions are you making regarding the internal diameter of the thermometer and the expansion of alcohol?
November 2, 2010

Chemistry
Suppose that you had a mercury-in-glass thermometer marked and calibrated to measure temperatures from -10 degrees celsius to 110 degrees celsius and you wished to measure a temperature of approximately 115 degrees celsius accurately. How might you use your thermometer to do it?
November 2, 2010

math
I need help with parametric equations, locus problems, tell me how to solve all questions if you can. Need help with one below: Tangents are drawn to a parabola x^2=4y from an external point A(x1,y1) touching the parabola at P and Q (a) Prove that the mid point, M, is the ...
November 1, 2010

Chemistry
How many electrons in an atom can have each of the following quantum number or sublevel designations? 1. n = 4, l = 3
October 30, 2010

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