Monday

October 5, 2015
Total # Posts: 2,016

**Organic chem 2**

Hello, I am having some trouble trying to reduce a benzene ring with a H3C-C=N-NH2 substituent, to a cyclohexane with the same substituent. The ring is attached to the carbon that is double bonded with the nitrogen. Apparently the hydrogenation, H2/1000psi with ru/rh at 100C, ...
*October 11, 2011*

**science**

Mercury is a heavy metal. Using atomic models and the periodic table of elements, explain why it belongs to this category of elements
*October 10, 2011*

**physics**

A compact disc spins at 2.8 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 3.1 cm from the CD's center. (a) What is the coefficient of friction between the ant and the CD? I dont understand how ...
*October 9, 2011*

**physics**

A 5kg box on a horizontal plane has a coefficient of kinetic energy of 0.2. The object is pulled on horizontally with a rope at 2 m/s^2. With 9.8m/s^2 gravitational force, what is the tension on the rope?
*October 6, 2011*

**physics**

Stickman is driving a dragster. He does the quarter mile in 4 seconds and at the finish line is speed is 100m/s. He deploys his parachute after he crosses the finish line and wished to slow to a speed of 10m/s in 10s. What diameter parachute does he need if the drag force is ...
*October 2, 2011*

**chemistry**

It takes 75 mL of 0.124 M KOH to neutralize 28.5 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in moles/liter.
*October 1, 2011*

**math**

how do i find the answer to this expression 1.4 over 5.5 subtract 4.9 over 2.0
*September 26, 2011*

**math**

how do i find the answer to this expression 1.4 over 5.5 subtract 4.9 over 2.0
*September 26, 2011*

**math**

A model of a brdge is 1m long and 2.5% of the actual size of the bridge. How long is the actual bridge?
*September 25, 2011*

**Algebra II**

Right now we're doing systems of Linear Equations in Three Variables. It says to solve the following system: x - y + 3z = 4 x + 2y - z = -3 4x + 3y + 2z = -5 Whatever I try with this problem (and the others like it) it comes out wrong. I've had about one success. And ...
*September 20, 2011*

**Math**

1. Evaluate the indefinite integral ([6x^2 + 12x^(3/2) +4x+9]/sqrt x)dx. Answer = + C 2. Evaluate the indefinite integral (12sin x+4tan x)dx. Answer = + C 3. Evaluate the indefinite integral. (x^7)e^(x^8)dx. Answer = + C Thank you for helping.
*September 19, 2011*

**physical science**

which of the following statements correctly describes the substance with the formula KI?
*September 19, 2011*

**Algebra II**

Evaluate: ƒ(2) + 5 It says to use this graph to solve the equation: h t t p://i55 . t i n y p i c . com/2qdvfur.jpg Right now we're on Algebra and Composition with Functions. I have no idea what I'm supposed to do, and there are no instructions for any of these ...
*September 18, 2011*

**Physics**

A small source of light is located at a distance from a vertical wall. An opaque object with a height of moves toward the wall with constant velocity of magnitude . At time , the object is located at the source .
*September 15, 2011*

**math**

The answer should be 75 gray sweatshirts using the method that JJ explained.
*September 15, 2011*

**calculus**

show that if a, b & c are in v3, then (a cross b) dot [(b cross c)×(c cross a)] = [a dot (b cross c)]^2
*September 14, 2011*

**problem solving**

in a soccer tournament there are 22 entries. the tourney is single mathc elimination. that is 2 soccer teams compete at the same time and the loser is elimnated. how many games will be played to deterenmine chanmpioneship?
*September 12, 2011*

**ALGEBRA PLS HELP**

IS ANYONE AVAILABLE TO HELP TO SEE IF I DID THESE 5 PROBLMES OK?
*September 11, 2011*

**ALGEBRA PLS HELP**

CAN YOU CHECK IF IM RIGHT? |-2 +5 | ANSWER 7 |5| +4 ANSWER: 9 |-5| +4 ANSWER : 9 |5+2| ANSWER : 7 |3-7| ANSWER : -4
*September 11, 2011*

**English**

number 2 is c
*September 11, 2011*

**algebra**

1 |-2+5| 2 |5| +4 3 |-5| +4 4 |5+2| 5 |3 - 7| here are my answers: 1) 3 2) 9 3) 1 4) 7 5) 4
*September 11, 2011*

**algebra**

1) 3 2) 9 3) 1 4) 7 5) 4
*September 11, 2011*

**algebra**

fine each absolute value 5 quesitons: |-2+5| |5| +4 |-5| +4 |5+2| |3 - 7|
*September 11, 2011*

**Algebra 2**

6x=9y-21. 6y=4x+14 plz help...I can't figure out how to do this problem using linear equations with two variables
*September 11, 2011*

**science**

i need to make a taxonomic key for fruite apple orange strawberry banana can you help me with that
*September 10, 2011*

**chippewa**

FIND the ESTIMATE: 1) A RARE TRUFFLE ONCE SOLD FO $13.20 FOR A 0.44 OZ CAN. APPROXIMATELY HOW MUCH WOULD 1LB OF THIS TRUFFLE COST?
*September 5, 2011*

**math solution**

1200000*0.075*5+1200000
*September 3, 2011*

**math**

Angelo is paid double time for each hour he works over 40 hours in a week. Last week he worked 42 hours and earned $660. What is his normal hourly rate?
*September 1, 2011*

**math**

Scientists have calculated that the Moon's revolution around Earth is increasing by about .015 s per century. At this rate, how long would it take the length of a month to increase by one full day?
*September 1, 2011*

**7th grade math**

A diver dives from a platform with a height of 11m. What is the change in elevation if the depth of the dive is 4m?
*August 25, 2011*

**Algebra**

Sorry I forgot to put that the depth of the dive qas 4m. Somehow you need to figure out how to use the 11m and 4m in an equation.
*August 25, 2011*

**Algebra**

A diver dives from a platform with a height of 11 meters. What is the change in elevation of the dive?
*August 25, 2011*

**Algebra**

Adiver divies from a platform with a height of 11 meters. What is the change in elevation of the dive?
*August 25, 2011*

**Geometery**

thank you but how do you know the answer is d and not c?
*August 23, 2011*

**Geometery**

A circular region rotated 360 degrees around its diameter (serving as an axis) generates a a) cube b) rectangle c) cone d) sphere
*August 23, 2011*

**AP Chemistry**

I got 1054.9 as my answer. I reversed the first eq and did (1/K1^(1/2)) added it to reverse of second eq (1/K2) then added that to the 3rd eq times 2 (K3^2). This got me the right equation. Do I just multiply the new Kc values together to get the final Kc of the new equation?
*August 17, 2011*

**AP Chemistry**

Given: 2N2(g) +O(2) --> 2N2O(g) Kc =1.2x10^(-35) N2O4(g) --> 2NO2(g) Kc = 4.6x10^(-3) 1/2N2(g) + O2(g) --> NO2(g) Kc= 4.1x10^(-9) Calculate Kc for the reaction between one mole of dinitrogen oxide gas and oxygen gas to give nitrogen tetroxide gas.
*August 17, 2011*

**statistics**

You want to estimate the mean of a population within + 3 with 90 % confidence If the population standard deviation is = 8, how large of a sample is needed?
*August 14, 2011*

**History **

Can some one help me with these questions? Because Japan was hit by the worldwide economic depression in the 1930s, military leaders were able to gain power. Question 1 answers True False Question 2 text Question 2 After Japan withdrew from the League of Nations they aligned ...
*August 9, 2011*

**history **

What is the basic message of the Quran and when was it compiled.
*July 30, 2011*

**History **

How long did the roman civilization last?
*July 29, 2011*

**chemistry**

the temperature of a 20.0g sample of a metal(specific heat .03 J/g-C) is raised by 20C. How much heat has been absorbed by the metal?
*July 13, 2011*

**Physics**

I am having trouble with the last portion of this question. If someone can help me, I would sincerely appreciate it. A bicycle wheel has a radius R = 32.0 cm and a mass M = 1.82 kg which you may assume to be concentrated on the outside radius. A resistive force f = 147 N (due ...
*July 9, 2011*

**Physics**

I am having trouble with the last portion of this question. If someone can help me, I would sincerely appreciate it. A bicycle wheel has a radius R = 32.0 cm and a mass M = 1.82 kg which you may assume to be concentrated on the outside radius. A resistive force f = 147 N (due ...
*July 7, 2011*

**Algebra II**

Give the equations of any vertical asymptotes for the graphs of the rational functions. f(x)=(x-4)/(x²+7)
*July 7, 2011*

**Math**

Simplify: (4 - 5i)(3 + 2i)
*July 3, 2011*

**algebra II**

Simplify (-3i)^2
*July 3, 2011*

**Math**

The sum of the degree measures of the angles of a quadrilateral is 360. Find the measure of the fourth angle of each quadrilateral given the degree measures of the other three angles. 4x+12, 8x - 10, 6x+5
*June 30, 2011*

**chemistry**

25 x 0.2 = 5 5/1000= 0.005 moles
*June 21, 2011*

**Algebra**

you start a pet sitting service. you spend $35 on advertising. You plan to change $5 on a day to watch each pet. a) write an equation to relate your daily income y to the number of pets x you watch. b) how many days do you need to watch a pet to pay for advertising?
*June 16, 2011*

**physics**

A mass is suspended on a spring scale. The scale shows a reading of 5N and stretches a distance of 0.2 meters from its relaxed length. 1)What is the spring constant of the scale? )If this scale was taken to a planet that has a mass 4 times larger than the earth and a radius 4 ...
*June 16, 2011*

**Physics**

A cessna plane flies with a speed of 150km/h relative to the air and points due east. A wind is blowing at a speed of 20km/h at 45 degrees south of east (ie the wind is blowing from the northwest). The resultant veloity of the plane relative to the ground is?
*June 14, 2011*

**Physics**

While peforming a concert , Queen plays at average intensity levels of 2 W/m^2. Then during a sudden loud part of the music, the amplitude of the sound waves , initially A1 increases by a factor of 5. By how many decibels does the sound level increase?
*June 13, 2011*

**human resources**

How does human resources help or hinder bussinessses
*June 2, 2011*

**Finance**

If you need help on a full paper..google termpapergurus..theyll help you out for sure!
*May 31, 2011*

**Accounting**

what exactly are we you asking for in this? are you asking for the journal entries?
*May 29, 2011*

**eco**

Suppose a person pays $80 of annual interest on a loan that has a 5 percent annual interest rate. The loan amount is: A. $400. B. $1,600. C. $160. D. $85. 10. Suppose a loan customer is considering two alternative $22,000 loans. Loan 1 requires payment of $1,100 of interest ...
*May 26, 2011*

**chem.**

metals and non-metals
*May 22, 2011*

**algebra**

A pack of Jillybeans contains seven different flavors: Apricot, Banana, Coconut, Date, Eggplant, Fig and Grape. You can make each flavor indivdually or come up with some crazy combinations. How many flavor combinations are possible with these seven flavors alone or mixed?
*May 22, 2011*

**science **

what is the process by which cells divide? please help thanks
*May 19, 2011*

**Anatomy**

A person needs to stop, rest, and take in enough oxygen to complete the catabolism of lactic acid and relieve the muscle?
*May 19, 2011*

**Anatomy**

For Muscles to work, they need a stimulus from a ____________ nerve and a source of energy that is ___________, is also known as __________.
*May 19, 2011*

**Physics**

A conduction heat wave is caused to pass through a metal bar of average temperature Tmean = 38.0 ¢XC, altering its temperature sinusoidally with an amplitude of Ti = 3.00 ¢XC. The equation which gives the temperature, T(x,t), of the metal bar at any place x (in ...
*May 18, 2011*

**Statistics**

The value of the correlation coefficient can be between 0 and 1.
*May 17, 2011*

**vibration**

a uniform cantilever beam of the total mass ml has a concentrated mass M at its free end. determine the effective mass of the beam to be added to M assuming the deflection to be that of a massless beam with a concentrated force at the end, and write the equation for its ...
*May 17, 2011*

**geometry**

Find the area of: A square with radius 9. (Please explain how you found it! Thanks!)
*May 10, 2011*

**geometry**

Find the area: A rectangle with length 12 inscribed in a circle with radius 7.5 (explain how you do it please! Thanks!)
*May 10, 2011*

**algebra**

Word problems confuse me. THe owner of a fancy food shoppe wants to mix cashews selling at $8/kg and pecans selling at $7/kg. How many kg of each kind of nuts should be mixted to get 8 kg worth $7.25/kg?
*May 10, 2011*

**MICROECONOMICS**

job that will increase your lifetime earnings by 300,000 but that requires an MBA
*May 6, 2011*

**math**

I GOT IT ITS 3
*April 26, 2011*

**math**

x^3 - 3x^2 + x Substitute 3 for x so i got 3^3 - 3(3)^2 + 3 27 - 3 - 9 + 3 24 - 9 + 3 15 + 3 18 Is this correct ??????????//
*April 26, 2011*

**calculus**

Let f be a differentiable function such that f(3) = 2 and f'(3) = 5. If the tangent line to the graph of f at x = 3 is used to find an approximation to a zero of f, that approximation is? So confused
*April 21, 2011*

**algebra**

need formula shaded rectangle with circle in middle. shaded area outside 3ft by 5ft.
*April 20, 2011*

**business**

Currently, jobs at the Pelham plant are broken into small individual steps, and a worker is assigned to perform each step in an effort to achieve task efficiency. This technique is known as job:
*April 20, 2011*

**science**

How many grams of glucose (180g/mole) would be needed to make 100ml of a 1.5 M solution?
*April 18, 2011*

**Chemistry**

How do I calculate the solubility of a compound in grams of solute per 100 grams of solution?
*April 16, 2011*

**algebra**

How many different seven digit phone numbers are available if the only restriction is that the first digit cannot be 0.
*April 14, 2011*

**Algebra**

Guess the 4-digit combination. An X stands for a correct digit in its correct place in the combination and an O stands for a correct digit out of its corect order. 8256 OX Two of the four digits 8,2,5,6 appear in the final combination(one in the position given(for example 6 ...
*April 9, 2011*

**Science**

Hi, I asked this question earlier, but didn't get any replies. If anybody could help, it would be extremely appreciated! A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the incline (T = 315 ...
*April 7, 2011*

**Physics**

A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the incline (T = 315 N). If the bed of the truck is 1.2 m above the ground what is the efficiency of this simple machine in loading the box into ...
*April 7, 2011*

**MATLAB**

Find the value of x (to 2 decimal places) when y is a minimum, using a while loop. Format the answer, e.g., "At x=ii.ii, y=jj.jj is a minimum". Plot the function. y = x^2 - 4x + 2
*April 6, 2011*

**physics**

You look up and see a helicopter pass directly overhead: 3.10-s later you hear the sound of the engines. If the air temperature is 23.0°C, How high was the helicopter flying?
*April 5, 2011*

**Algebra**

What is the positive difference in the sum of the letters in the words MATH and COUNTS, if each letter is assigned a value as follows: A=1, B=-2, C=3, D=-4,..., Y=25, Z=-26?
*April 4, 2011*

**math**

Provide an example of an arithmetic series which totals zero. Using complete sentences, explain how you created the example.
*April 2, 2011*

**math**

When finding the sum of the arithmetic sequence 4 + 1 + –2 + –5 + –8 + –11, you will have a step of work that contains the number –3. Use complete sentences to describe how the –3 was calculated and what it means.
*April 2, 2011*

**math**

What is the common difference of a 43–term arithmetic sequence where the first term is –13 and the sum is 9,374?
*April 2, 2011*

**math**

What is the sum of the arithmetic sequence 22, 13, 4 … if there are 28 terms?
*April 2, 2011*

**math**

What is the sum of a 12–term arithmetic sequence where the last term is 13 and the common difference is –10?
*April 2, 2011*

**math**

The windows of a downtown office building are arranged so that each floor has six fewer windows than the floor below it. If the ground floor has 52 windows, how many total windows are on the first eight floors?
*April 2, 2011*

**math**

What is the sum of a 10–term arithmetic sequence where the first term is 3 and the last term is 75?
*April 2, 2011*

**physics**

A beam of light makes an angle of θi = 7.0˚ with the normal of a slab of transparent material of t=1.00-mm-thickness. If the index of refraction of the glass is n2 = 1.40 , how far vertically (d) is the point at which the beam leaves the glass surface from the point ...
*April 2, 2011*

**physics**

A beam of light makes an angle of 13.0° with the normal of a mirror made of 4.70-mm-thick glass silvered on the back. If the index of refraction of the glass is 1.30, how far is the point at which the beam leaves the glass surface (after being reflected from the silver ...
*April 2, 2011*

**Calculus**

Use five iterations in Newton’s method to estimate the root of cos(2x)-2x.Use x0 = π/4 and eight decimal places.
*April 2, 2011*

**physics**

The four wires that lie at the corners of a square of side a= 5.60 cm are carrying equal currents i= 1.80 A into (+) or out of (-) the page, as shown in the picture. Calculate the x-component of the force on a 1.0-cm long piece of the lower right-hand wire, due to the other ...
*March 28, 2011*

**Calculus.**

What is the derivative of [(3t+4)/(6t-7)]^3?
*March 27, 2011*

** MAth Im stuck on question can anyone help me ?**

I think it is C becuase the denominator would be 2*2*2 which would be 8.
*March 27, 2011*

**chemistry**

what volume of nitrous oxide gas N2O has the same number of atoms as 9.0 liters of neon gas at the same temperature and pressure
*March 26, 2011*

**Calculus**

ok, thats what i got! thanks so much
*March 24, 2011*

**Calculus**

What is the limit as t approaches 0 for (sint)/(1+cost)?
*March 24, 2011*

**Statistics **

Twenty people are to be seated at 3 Circular restaurant tables that seat 8,7, and 5 people respectively. Determine the number of ways that this can be done. Express your answer in scientific notation to two decimal place.
*March 20, 2011*