Wednesday

October 7, 2015
Total # Posts: 876

**physics**

but you don't know hf or ho, how do you you use the conservation of energy equation?
*October 8, 2010*

**science**

the pneumoconiosis that is caused by inhalation of iron oxide is called A.anthracis B.toluene C.xylene D.acetone
*September 30, 2010*

**chemistry**

wich of the following has the highest vapor pressure A.benzene Btoluene C.xylene D.acetone
*September 30, 2010*

**Math- Simplifying Identities **

1.) cot(-θ)(secθ) I think the answer is secθ but I don't know how to get this. 2.) (tanθ) / (cos)(90° -θ) 3.) 3sin2xcos2x - sin4x 4.) (cosx + tanx) / (csc^2 x)
*September 28, 2010*

**math**

a locomotive is traveling at 120 mph. the engineers reaction time is 0.9 seconds how many feet will the train travel before the engineer recognises an emergency and applies the brake. A.265.ft B.260.ft C.160.ft D.165.ft.
*September 27, 2010*

**math**

a overhead gantry crane that is equiped whith a crane and hook block and reeved with 6 parts of line is lifting 12 tons what is the load on the haul line A.2000lbs B.6000lbs C.8000lbs D.4000lbs please show the formula
*September 27, 2010*

**math figuire**

an electric motor operates at 110 volts and a resistance of 22ohms the ampage is.. A. 4.5 amps B. 4 amps C. 5000 mi D. 4500 mi
*September 27, 2010*

**stats**

Some IQ tests are standardized to a Normal model with a mean of 100 and a standard deviation of 16. About what percent of people should have IQ scores above 116?
*September 26, 2010*

**statistics**

In a standard Normal model, what value of z cut off the region described as the lowest 1.5%?
*September 26, 2010*

**math**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.5 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.)
*September 22, 2010*

**Algebra**

Thank you
*September 21, 2010*

**Algebra**

How do I solve a quadratic equation x^2 - x = 30 by completing the square- I don't understand-could someone just explain the steps to solving this
*September 21, 2010*

**physics**

A ball is thrown horizontally from the roof of a building 33.0 m tall and lands 20.5 m from the base. What was the ball's initial speed?
*September 21, 2010*

**Physics**

A projectile is launched from ground level to the top of a cliff which is 195 m away and 155 m high. If the projectile lands on top of the cliff 9.2 s after it is fired, find the initial velocity of the projectile (magnitude and direction). Neglect air resistance.
*September 21, 2010*

**12th grade Math - word problems**

#1.) The population of bacteria after t hours is given by P(t) = 500/(1+83.33e^-0.162t) a.) What is the initial population? b.) When will the amount of bacteria in the population be 12? #2.) Which investment yields the greater amount after 4 years? a.) $900 at 9% interest ...
*September 20, 2010*

**algebra 1**

in the equation below, y is a function of x. y = 4x + 8 if the value of x isdecreased by 3, how will the value of y change?
*September 20, 2010*

**Math - True or False**

True or False: 1. f(x) = -x^3 + x + 1 is an odd function 2. f(x) = x^3 -ax^2 + bx represents a cubic equation having no constant term ...(I'm thinking true?) 3. If f(x) = x/x+2 then f^-1 (x) = 2x/1-x ...(my guess is false?) 4. The equation x^3 - 12x + 16 = 0 has a double ...
*September 12, 2010*

**Physics**

A baseball player is approaching home plate with a speed of 5.8m/s when he decides to slide. He slides for 1.1s, just reaching the plate safe. What is the magnitude and direction of the player's acceleration? How far did he slide? His magnitude of acceleration is 5.8/1.1= ...
*September 11, 2010*

**Math**

Two taps named tap A and B are used to fill a tank. Tap A on its own takes 5 hours longer than tap B to fill the tank. The two taps working together fill the tank in 6 hours. How long does it take tap A to fill the tank on its own? How long does it take tap B to fill the tank ...
*September 10, 2010*

**Math **

Oh and the qn is How long will it take tap A to fill the tank how long will it take tap B to fill the tank help
*September 10, 2010*

**Math **

Two taps, having different rates of flow are used to fill a large water tank. If tap A is used on its own it will take 5 hours longer to fill the tank that it would take tap B to fill it on its own. Together, the taps would fill the tap in 6 hours. Assuming that the taps are ...
*September 10, 2010*

**2nd grade**

Why does the sun always shine in space?
*September 9, 2010*

**math**

One year, China consumed 4 times as much energy as Brazil.Define a variable and write an expression for the amount of energy China used that year.
*September 8, 2010*

**Taxes**

When doing your child's Kiddie tax can you receive the return?
*August 30, 2010*

**math**

I am supposed solve these SYMBOLICALLY but i don't know how since i was never taught in school. Could someone help me solve these? 1. 7(e^(2x))^3 = 35 2. 7^(x^2-x)=7^6 3. log3(5x)=4 Thank YOU very much!!
*August 24, 2010*

**math**

Use the point-slope formula. y-y1=m(x-x1) Pick one of the two points you have. y1 = the y point, x1 = the x point, and m = the slope. Plug those numbers in and then rearrange until you get the form x+y=c. Your answer (if you use the point (-5,-5)) will be (2/3)x-y=(5/3). If ...
*August 14, 2010*

**English**

Number two is correct.
*August 14, 2010*

**MATH**

A SOCCER TEAM PLAYED 160 GAMES AND WON 65 PERCENT OF THEM. HOW MANY GAMES DID THEY WIN?
*August 11, 2010*

**Literature**

What literature do you consider to be part of the United States' current literary canon, and why? o How do those selections reflect the cultural tradition of the United States? o What do you consider to be part of your personal literary canon?
*August 9, 2010*

**Principles of Accoun ting**

Thank you! This will come in handy!
*July 26, 2010*

**Principles of Accoun ting**

I have to figure out what basic type of account debited and credited, the specific account, whether the account is increased or decreased, and the normal balance of the specific account. This is the transaction. Purchased used car for $4,000 cash for use in business. For the ...
*July 26, 2010*

**CJA/363**

AFIS Facial recognition
*July 19, 2010*

**CJA/363**

The thing is I cant find much information to put this paper together the correct way
*July 19, 2010*

**CJA/363**

I have never used this before and curious on what kind of help I could actually get
*July 19, 2010*

**CJA/363**

I am lost and have no clue what to even write about
*July 19, 2010*

**CJA/363**

Technology and Communication Paper · Prepare a 1,050- to 1,750-word paper that explains how technology has affected the communication capabilities of specialized databases in the criminal justice system. · Include the following in your paper: o A comparison of at...
*July 19, 2010*

**poetry**

WHERE DO THE SLASHES GO IN THE SYLLABLES OF ROBERT FROST'S POEM/THE ROAD NOT TAKEN
*July 15, 2010*

**accounting**

Cooper Construction Company had a contract starting April 2010, to construct a $9,000,000 building that is expected to be completed in September 2012, at an estimated cost of $8,250,000. At the end of 2010, the costs to date were $3,795,000 and the estimated total costs to ...
*July 8, 2010*

**accounting**

On January 2, 2010, Wine Corporation wishes to issue $2,000,000 (par value) of its 8%, 10-year bonds. The bonds pay interest annually on January 1. The current yield rate on such bonds is 10%. Using the interest factors below, compute the amount that Wine will realize from the...
*July 8, 2010*

**Chemistry *DrBob222**

Posted by Jamie on Sunday, June 20, 2010 at 3:36pm. You are given three test tubes that contain colourless liquid. One test tube contains benzene, another contains ethanol, and the third contains 2,4-hexadiene. Design a procedure that will tell you the contents of each test ...
*June 20, 2010*

**Chemistry**

hmmmm.. well what methods should i be using? should i add water to each of them, and i will know that the only homogenous mixture is ethanol. Then I could add Br2 to the remaining ones, and the 2,4-hexadiene will be uniform, leaving me with the benzene? am i on the right track?
*June 20, 2010*

**Chemistry**

You are given three test tubes that contain colourless liquid. One test tube contains benzene, another contains ethanol, and the third contains 2,4-hexadiene. Design a procedure that will tell you the contents of each test tube. Describe your expected observations. So benzene ...
*June 20, 2010*

**chemistry**

I need to find how many grams phosphorus (P) are in 0.8645 g sample of MgNH4PO4 x 6H2O How many grams P2O5 can be calculated with this many grams of P What is the percent P (as P2O5) in this
*June 14, 2010*

**CUltural Diversity**

Native Americans who are employed are less likely to be managers, professionals, technicians, salespeople or administrators. is this true or false?
*June 12, 2010*

**organic chemistry**

what is the major and minor product of 3-methyl 1-pentene + propanol reacted with sulfuric acid?! Detailed mechanism reaction please?? Thank you!
*May 19, 2010*

**Chemistry**

2HI(g)--> H2(g) + I2(g) The rate law for the decomposition of HI is r=k[HI]^2. The rate of the rxn was found experimentally to b 2.5 x 10^4 mol/L x s where the HI concentration was 0.0558 M. Are these values ready to plug in to the equation, or because there is 2HI, do I ...
*May 16, 2010*

**Chemistry**

Just a few questions about rates of reaction. A) Why are the units for average and instantaneous rates the same? -because they are both measures of how quickly a reaction is occuring per unit time B) For a given set of data, two students determined different average reaction ...
*May 16, 2010*

**CHEMISTRY**

This is STOICHIOMETRY. Please i need help in the worst way. I don't understand this at all and it is due tomorrow, please i need someones help who really understands this. #1.aluminum nitrite and ammonium chloride react to form aluminum chloride, nitrogen gas, and water. ...
*May 13, 2010*

**algebra**

a/3+a/3-1=a solve for a
*May 13, 2010*

**Math**

How do you work this problem? What does the 2x stand for?
*May 11, 2010*

**college**

I am taking an english class with the same question right now. I am a bit confues too but I think the question for example means to write: Education plays a big role in financial success. Then put what type of verb tense is being used and use the same sentence but with ...
*May 8, 2010*

**statistics**

Assume the body temperture of healthy adults are normally distributed with a mean of 98.20 degrees F and a standard deviation of 0.62 degrees F... a. If you have a body temperture of 99.00 degrees F, what is your percentile score? b. Convert 99.00 degrees F to a standard score...
*May 8, 2010*

**Computers/Excel**

You wish to calculate the commission on sales. The commission is 6% on all sales that are at least 20% above cost.
*May 3, 2010*

**math**

d^2-144=0
*April 22, 2010*

**Math**

is 7.02 correct for A and I am still stuck on B
*April 21, 2010*

**Math**

A random survey of 500 households determines that 20% of the households would do so and that each participating household expects to recycle about 100 cans monthly with a standard deviation of 30 cans. Question (a) What is the 95% confidence interval regarding the percentage ...
*April 21, 2010*

**Algebra**

Simplify 2sqrt25x^3 -3x sqrt4x
*April 21, 2010*

**12th grade**

solve: sec(1/4)X+"Square Root of 2"=0
*April 19, 2010*

**algebra**

83% of 335 =
*April 15, 2010*

**Marketing**

What marketing segmentation criteria could be used to find a person like your self from a purchased list of names? Assume an ad agency is preparing a marketing campaign for an auto company that is bring out a new car. What kind of marketing mix and branding message would be ...
*April 14, 2010*

**Business Law**

Limited Liability Companies. John, Lesa, and Trevor form a limited liability company. John contributes 60% of the capital, and Lesa and Trevor each contribute 20%. Nothing is decided about how profits will be divided. John assumes that he will be entitled to 60% of the profits...
*April 12, 2010*

**Math 157**

How many rectangles will fit about a point when tessellating the plane? How do you know?
*April 9, 2010*

**physics**

An electron, moving with a speed, 6.8 km/s, enters a magnetic field that has a strength of 6.9 T. The magnetic force on the electron is perpendicular to the electron's velocity. Determine the radius of the resultant path of the electron.
*April 9, 2010*

**calculus**

Thanks, but where did you get the 2a = 10 from?
*April 8, 2010*

**calculus**

Oh shoot. You're right. I took the last part from a different problem. The sum of the distances is equal to 10. Sorry.
*April 8, 2010*

**calculus**

Find the equation of the following. The locus of all points in a plane such that the sum of the distances from points (-2,-1) and (-10,-1) is equal to 6.
*April 8, 2010*

**phisics**

What is the gravitational potential energy of a 300.0 g coffee cup sitting on a table top 1.25 m above the floor?
*April 7, 2010*

**phisics**

What is the total mechanical energy of a 20 kg owl flying at 5.0 m/s through the air at a height of 25 m above the ground?
*April 7, 2010*

**phisics**

If a person were 300 meters above ground and it took them 7.746 secounds to hit the ground, how fast were they traveling?
*April 7, 2010*

**pre-calculus**

What is the polar form of the equation 3x - 4y = 12? The answer is r = 12/ (3cosx - 4 sinx) (x = theta) I don't know how to get the answer though.
*April 6, 2010*

**math**

Let U = {xƒ}x is an American}, C = {x/x is a smoker}, D = {xƒ}x has a health problem}, E = {xƒ}x is a male} Describe a person who is an element of each of the following sets. Describe a person who is an element of each of the following sets:i) C (ii) CnU (iii) ...
*April 1, 2010*

**staticitics**

I got the same answer for standard deviation, except the 5.75 should be rounded to the nearest tenth.
*March 30, 2010*

**Science**

Write the formula, substitute numbers and units(labels)Mike mixed 20g of 60C water with 40g of 25C water. The final temperature was 39C. 1.Calculate the change of temperature for hot water. 2.Calculate the calories transferred from the hot water. 3.Calculate the amount of heat...
*March 29, 2010*

**Science**

1.Air can be compressed. What does it mean and why can it be compressed? 2.Air can be expanded. What does it mean and why can it expand? 3.Air also contracts.What does that mean and how does that happen? 4.Can all gases contract and expand? Why or why not?? Please help me!
*March 29, 2010*

**Chemistry**

Time, (min): 0 10 20 30 Moles,(trans): 1.00 0.90 0.81 0.73 Given the following data, what is the order of the reaction? How long will it take for the half of the trans compound to decompose?
*March 24, 2010*

**Chemistry**

Kp=1.78 at 250 degrees for the decomposition reaction, PCl5(g)->PCl3(g)+Cl2(g. Calculate the percentage of reactant that remains if 10.0 moles of starting material are placed in a closed vessel at this temperature and 2.00 atm pressure. Also, determine the value of Kc for ...
*March 24, 2010*

**science**

The population of Singapore is 4987600 people. The territory of Singapore is 710.2 km^s. The population of Namibia is 2171000 people, while its territory is 824292 km^2. Estimate the population densities of Singapore and Namibia.
*March 24, 2010*

**chemistry**

What aldehyde and primary alcohol might be oxidized to yield 4-methylcyclohexanoic acid?
*March 21, 2010*

**Chemistry**

What aldehydes and primary alcohols might be oxidized to yield the following carboxylic acids: 1)p-methylhexanoic acid 2)pentanoic acid #1 should have been p-methylcyclohexanoic acid (p is para). My homework has the structure drawn out and I named it wrong. Sorry. It has a CH3...
*March 20, 2010*

**Chemistry**

Write the structure of the hemiacetals that results from the following reactions: 1)2-butanone + 1-propanol 2)butanal + isopropylalcohol I got this for #1: CH2-C-OCH2CH2CH3 with an OH on the single C and the CH2CH3 on the single C. I don't know how to do the second one. I ...
*March 20, 2010*

**Chemistry**

What aldehydes and primary alcohols might be oxidized to yield the following carboxylic acids: 1)p-methylhexanoic acid 2)pentanoic acid
*March 20, 2010*

**trig**

How do I dertermine the measure of theta for the equation 4cos theta - sqrt 12 = 0. My answer was 2pi/3,4pi/3 I'm told it's wrong could you please show me how to do this type of question
*March 17, 2010*

**physics**

Three charges are arranged as follows: +3 mC located on the y-axis at +15 mm; -2.5 mC located on the x-axis at -25 mm; and +4.0 mC located at the origin. Determine the magnitude of the force acting on the charge located at the origin.
*February 21, 2010*

**Chemistry Question!!**

Realize there are 0.830 g of I2 at equilibrium... not I
*February 19, 2010*

**science**

3. Hydrobromic acid dissolves solid iron according to the following reaction: Fe(s) + 2HBr(aq) ---> FeBr2(aq) + H2(g) What mass of HBr (in g) would you need to dissolve a 3.2 gram pure iron bar on a padlock? What mass of H2 would be produced by the complete reaction of the ...
*February 14, 2010*

**physics**

Estimate the magnitude of the electric field in a cell membrane with a thickness of 8nm
*February 13, 2010*

**Science**

What are some examples of speed and velocity? I'm trying to illustrate them for a project, but i don't know what to draw
*February 2, 2010*

**physics**

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s? 1 s
*February 2, 2010*

**physics**

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s?
*February 1, 2010*

**geometry**

Your edge count is wrong.
*January 29, 2010*

**geography**

6 ways the geography helped the civilization grow
*January 28, 2010*

**Geometry**

We put all possible combinations of p and q true and false in the table - there are 4 combinations. p q ~p^q 0 0 0 1 1 0 1 1
*January 27, 2010*

**math**

Ted put several different integers in order from least to greatest. He then put the same integers in order from greatest to least. Both times the same number was third in order. Explain how this is possible.
*January 25, 2010*

**geometry**

diameter 11cm
*January 25, 2010*

**college**

38.3/1.50
*January 14, 2010*

**History**

What does Jefferson mean by we must resort to manufacturing out
*January 12, 2010*

**Pre-Cal**

solve(5-x)^-3=8 teach if possibe if not, its ok Thanks
*January 10, 2010*

**Pre-Cal**

log base2 5 square root of 512 use the definition of b^1/n log base2 512^1/5 Not quite sure what to do after this Simplfiy.
*January 10, 2010*

**Pre-Cal**

Simplify e^3ln2-1
*January 9, 2010*

**chemistry**

What is the smallest volume of water at 20c that could be used to dissolve and remove potassium nitrate impurities and leave pure sodium hydrogen carbonate?
*January 6, 2010*