Friday

April 17, 2015

April 17, 2015

Total # Posts: 848

**Science**

Write a mechanism for the Claisen reaction of ethyl ethanoate (ethyl acetate) to give ethyl acetoacetate?
*April 18, 2011*

**statitics**

a light bulb manufacture gaurentees that the mean life of a certain type of bulb is at least 875 hours. A random sample of 40 light bulbs has a mean life of 863 hours with a standard deviation of 50. a=0.04
*April 18, 2011*

**english**

what is an example of a hyperbole (with the chapter number) in animal farm
*April 17, 2011*

**Algebra**

LCD=6 so you multiply all number by 6. denominators cancel out 6x + 6 = -4 6x = -10 x = -6/10 or -3/5
*April 13, 2011*

**chemistry**

which solution would have a high vapor pressure 6.0 M NaCl or 3.0 M LiCl?
*April 11, 2011*

**Math **

I am trying to help my son figure out this question. during an art class at your school, you and a class mate each won blue ribbons for 1/3 of the pieces you entered in to the contest. you won 2 blue ribbons and your classmate won 3. explain how this could be
*April 4, 2011*

**ugh**

ugh i love how there are ppl after me and i STIll dont get help
*March 31, 2011*

**Physics**

SEQUENCE of questions: 1)A typical steel B-string in a guitar resonates at its fundamental frequency at 240 Hertz. The length of the string is 0.620 m. What is the wave velocity along the string? Find your answer in m/s MY ANSWER 148.8m/s? 2)The tension in the above string is ...
*March 31, 2011*

**physics**

A typical steel B-string in a guitar resonates at its fundamental frequency at 240 Hertz. The length of the string is 0.620 m. What is the wave velocity along the string? Find your answer in m/s, but do not enter units. IS THE ANSWER 148.8m/s? (Frequency)(Wavelength)= Velocity...
*March 31, 2011*

**physics**

Have to figure out 1 before 2 and don't know were to start? 1)The tension in the above string is 84.0 N. Calculate the mass of a 3 m long piece of the steel string. 2)Find the wavelength of the third harmonic of the guitar string described in the problem before last. Find ...
*March 31, 2011*

**physics**

NOPE ITS NOT THAT EITHER!
*March 31, 2011*

**physics**

ACTUALLY IS IT TFFFT?
*March 31, 2011*

**physics**

Well I think it is TFFF?
*March 31, 2011*

**SS**

KOHLER, TOLMAN, AND BANDURA ARE IMPORTANT FIGURES ASSOCIATED WITH?
*March 30, 2011*

**math**

You meet a woman who tells you. "I have two children. One of them is a boy." What is the probability that both children are boys?
*March 29, 2011*

**Chemistry**

How can you measure 20 mg. of salt?
*March 23, 2011*

**Statistics**

Consider a population with mean = 43 and sd = 5.2. Calculate the x-score for an sample mean of 46.5 from a sample of size 35.
*March 18, 2011*

**Word problem solving with graph equation**

-2x+6=1y
*March 13, 2011*

**finance**

1. A bond has a $1,000 par value (face value) and a contract or coupon interior rate of 8%. A new issue would have a flotation cost of 5% of the market value. The bonds mature in 10 years. The firm’s average tax rate is 28% and its marginal tax rate is 39%. The current ...
*March 7, 2011*

**math **

julie travels 6 times faster then mill. Traveling in opposite directions, they are 714 miles apart afte 6 hours. Find the rate of travel
*March 5, 2011*

**Math**

Whom should you see at the bank if you need to barrow money?
*March 3, 2011*

**Physics**

The mass of a sports car is 1200 kg. The shape of the car is such that the aerodynamic drag coefficient is 0.250 and the frontal area is 2.30 m2. Neglecting all other sources of friction, calculate the initial acceleration of the car ,if it has been traveling at 80 km/h and is...
*February 24, 2011*

**Chemistry**

The reaction X + Y --> products was studied using the method of initial rates. The initial rate of consumption of X was measured in three different experiments. What is the value of the rate constant, k? *concentrations are in mol/L and initial rates are in molL-1s-1 Exp 1...
*February 23, 2011*

**elementary math**

1100two+101two=
*February 18, 2011*

**child day care management,health,safety,and nutrit**

It's A. Teratogens
*February 16, 2011*

**Calculus**

Find the derivative of the function f by using the rules of differentiation. f(x) = (10 x^3 + 3 x^2 + 5 x - 7)/x
*February 11, 2011*

**Calculus Quiz Today**

1. find the values of s for which each function is continous: f(x) = [ x if x less than or equal to 1] [2x-1 if x greater than 1] 2. determine all values of x at which the function is discontinuous: f(x) = (x^2-2x)/(x^2-3x+2) Could someone please tell me how to do these ...
*February 8, 2011*

**Spanish 1**

In Spanish I need to ask what a friend is doing. Que haces?, correct except with accent over "e" If the friend is skating- I could say Patino, correct? I need to ask a friend what they are doing so I would say Que haces? with accent over "e", correct But ...
*February 1, 2011*

**Spanish 1**

In Spanish I need to ask what a friend is doing. Que haces?, correct except with accent over "e" If the friend is skating- I could say Patino, correct? I need to ask a friend what they are doing so I would say Que haces? with accent over "e", correct But ...
*February 1, 2011*

**Math**

Prove the following vector relation: V * (pvv) = pv * vV + vV * (pv) Note: Multiplication sign is supposed to be a dot, both v's are vectors, and V is the del operator
*February 1, 2011*

**chemistry**

what is the residual entropy at T=0 k for 1 mol of C6H5Br Bromobenzene?
*January 28, 2011*

**history**

how do religions having common geographical origins tend to share somewhat common codes of behavior and view of the nature and reason for existence?
*January 27, 2011*

**physics**

An arrow is shot vertically upward and then 2.15 s later passes the top of a tree 37.0 m high. How much longer will the arrow travel upward, and how high will it go?
*January 26, 2011*

**Chemistry**

a dose of asprin of 5.0mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 8.5 pounds. Calculate the number of milligrams of asprin that should be administered.
*January 24, 2011*

**Math **

Find an equation of the line that passes through the point (3,10) and is parallel to the line x-3y=1
*January 23, 2011*

**math**

There are 1o patients in the hospital. Nine of them need the same medication. If the medicine bottle is 3/4 full, how much will each patient get from the bottle if divided equally?
*January 23, 2011*

**calculus**

According to Car and Driver, an Alfa Romeo going 70 mph requires 177 feet to stop. Assuming that the stopping distance is proportional to the square of the velocity, find the stopping distance required by an Alfa Romeo going at 45 mph and at 115 mph.
*January 19, 2011*

**calculus**

Find the equation of the line l, given that f(x)=10^x and the point A is at x=logbase10(4).
*January 17, 2011*

**Math**

What is the LCM of 3(t-7) and 21(t-7)? I am struggling with this!
*December 27, 2010*

**AP Physics B**

An object of mass 3.2 kg is allowed to fall from rest under the force of gravity for 3.5 s. What is the change in its momentum? Ignore air resistance.
*December 8, 2010*

**chemistry**

PH3 has a mass of 17.33 grams, what is the mass in grams of H2 produced? 4 PH3 -> P4 + 6 H2
*December 6, 2010*

**physics **

A set of crash tests consists of running a test car moving at a speed of 11.6 m/s (25.5 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 61.0 kg (134.2 lbs) dummy is found to move a distance of 0.750 m from the moment the car touches the wall to the...
*December 4, 2010*

**physics **

Two blocks are arranged. The pulley can be considered to be massless, and friction is negligible. M1 is four times more massive than M2. (m1 is on the table and m2 is hanging from the pulley). If the system is released from rest, how far will M1 travel in 0.963 s?
*December 4, 2010*

**physics **

A 6.00 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.1 N at an angle θ= 19.0° above the horizontal, as shown. What is the speed of the block 3.50 seconds after it starts moving?
*December 4, 2010*

**college**

People often make career changes in their lives. How would the humanistic theory of behavior explain this phenomenon?
*November 26, 2010*

**Physics**

Mass of gold in rock = 11.333 kg Therefore rock is 76.58% gold
*November 22, 2010*

**chemistry**

Three gases (8.00 of methane, 18.0 of ethane, and an unknown amount of propane, were added to the same 10.0-L container. At 23.0 C , the total pressure in the container is 3.60 atm. Calculate the partial pressure of each gas in the container.
*November 20, 2010*

**Physics**

A 20 kg bag of luggage is rolled across a horizontal floor by a force of 50 N applied to the handle which makes an angle of 65 degrees with the horizontal. If the bag moves at constant speed, what is the coefficient of friction between the bag and the floor?
*November 18, 2010*

**Physics**

A 20 kg bag of luggage is rolled across a horizontal floor by a force of 50 N applied to the handle which makes an angle of 65 degrees with the horizontal. If the bag moves at constant speed, what is the coefficient of friction between the bag and the floor?
*November 18, 2010*

**Accelerated Physics**

An 18.0 kg box is released on a 35.0° incline and accelerates down the incline at 0.269 m/s2. Find the friction force impeding its motion. How large is the coefficient of friction?
*November 16, 2010*

**math**

How many different combinations of coins can total exactly $0.40? I got 31 possible combinations
*November 15, 2010*

**english**

so i am really confused if this is a hyperbole: the tattoo killed him. i am reading the same book as another girl called the barcode tattoo and i am in need of some hyperboles for my project. please tell me if that quote: the tatoo killed him, is an hyperbole. thank you
*November 13, 2010*

**geometry**

The points L(4, 0),M(10, 0), and N(7, 5) form #LMN.What is the sum of the slopes of the three sides of the triangle?
*November 12, 2010*

**physics**

Most sphygmomanometers use mercury. How tall would the manometer tube need to be if it were filled with water instead? It might need to measure a blood pressure as high as 300 mm Hg.
*November 9, 2010*

**Math**

f of g of x
*November 8, 2010*

**Math**

f(x)= 4-x^2 and g(x)= sqrt (x) find the implied domain of fg(x) fg(x)= f(sqrt(x)) fg(x)= 4-(sqrt(x))^2 fg(x)=4-(sqrt x)(sqrt x) fg(x)=4-x domain= (x:x=all real numbers) Am I correct?
*November 8, 2010*

**Mathematics for Liberal Arts**

infinites absolute value symbol l l First look at some small finite sets: Let A={1,5,9} B={U,V,W,X,Y,Z} C={Barrak Obama, Joe Biden, Hillary Clinton} Fill in the blanks with one of the symbols <,>,= lAl lBl lAl lCl lAl lAl lBl lCl Describe how you decided the comparative ...
*November 7, 2010*

**Math**

Find the domain of the function sqrt(4-x^2). I tried it not sure if i'm correct 4-x^2>= 0 -x^2>=-4 x^2<=4 x<=2,x>=-2 Am I correct?
*November 7, 2010*

**Mathematics for Liberal Arts**

absolute value symbol l l First look at some small finite sets: Let A={1,5,9} B={U,V,W,X,Y,Z} C={Barrak Obama, Joe Biden, Hillary Clinton} Fill in the blanks with one of the symbols <,>,= lAl lBl lAl lCl lAl lAl lBl lCl Describe how you decided the comparative sizes of A...
*November 7, 2010*

**Chemistry**

7.72 g of CuBr2 contains how many bromide (Br-) ions?
*November 4, 2010*

**Pharmacology**

9.) is C. Caffeine enhances vasoconstriction and ergotamine absorption
*October 28, 2010*

**physics**

Remember that momentum is conserved. Momentum (P) = m*v so find P of the satelite (0.24 m/s * 1,300 kg) and then set that equal to the P of the astronaut (82kg * v). Solve for v. V should have the units m/s, then times that by 7.5 seconds, the seconds should cancel out to ...
*October 27, 2010*

**Liberal arts math**

what is the expected value for buying a ticket?
*October 24, 2010*

**Liberal arts math**

1) A lottery draws six numbers from 42 possibilities, without regard to order. What is the total number of possible results of the drawing. In the lottery from the before, what is the probability that you pick the winnin number? In the Lottery from number 1, you pay the state ...
*October 24, 2010*

**Spanish**

How do I say the weather in Buenos Aires is mostly sunny. I know sunny is hace calor but how to I actually say "The weather in Buenos Aires is hace calor? How do I say "the weather in Franklin is sunny and cool(hace sol y fresco)"-but I need the whole sentence. ...
*October 20, 2010*

**Math**

Thank you so much! I got to the third step and then couldn't figure out how to go about it without using decimals..but thanks so much!
*October 20, 2010*

**Math**

(3^x)(4^2x+1)=(6^x+2). Find the exact value of x giving the answer in the form x=ln(a)/ln(b).
*October 20, 2010*

**history**

i just need someone to directly answer my question. seriously. this is due soon
*October 17, 2010*

**history**

was the reign of terror necessary? what can we learn from it? pleasse help!!
*October 17, 2010*

**world history honors**

can someone just give me an answer please?? i kinda need to finish this before school tommorrow!!
*October 17, 2010*

**world history honors**

was the reign of terror neccesary for the French Revolution? What can we learn from the French Revolution? help please ;)
*October 17, 2010*

**college algebra**

how much is $0.35per miles per week
*October 17, 2010*

**physics**

A truck is traveling at 12 m/s down a hill when the brakes on all four wheels lock. The hill makes an angle θ = 15° with respect to the horizontal. The coefficient of kinetic friction between the tires and the road is 0.7. How far does the truck skid before coming to ...
*October 9, 2010*

**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*