Thursday

September 29, 2016
Total # Posts: 2,286

**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*

**Maths**

The cosine is positive in Quadrants I and IV, so; cos 58 = cos(360-58) = cos 302 The angle that has the same cosine as angle 58 is 302. You can check this using your calculator. cos(58) = 0.5299192642 cos(302) = 0.5299192642 Matt

*May 8, 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*

**Physics**

A cirular coil of 19 turns and radius 10.2cm surrounds a long solenoid of radius 2.6cm and 1.00x103 turns per meter. The two are oriented so that the axis of the coil and the axis of the solenoid are parallel and the center of the coil is at the center of the solenoid. If the ...

*March 11, 2011*

**Physics**

A cirular coil of 27 turns and radius 15.0cm surrounds a long solenoid of radius 4.7cm and 1.00x103 turns per meter. The two are oriented so that the axis of the coil and the axis of the solenoid are parallel and the center of the coil is at the center of the solenoid. The ...

*March 11, 2011*

**religion**

what sociopolitical issues helped spur the Reformation?

*March 8, 2011*

**Math**

If glenda rolled two six-sided number cubes nine times and computed the sum of the numbers rolled each time. If the mean sum of Glenda's rolls was 6 what was the total of the nine sums Glenda rolled? Suppose Glenda's rolls were 12,7,3,10,9, 2, 11, 7 and 8. What is the ...

*March 8, 2011*

**chemistry**

What is the pH of a 2.23 M HCHO2, formic acid, aqueous solution at 25 °C? ( Ka = 1.8E-4 )

*March 4, 2011*

**math**

A drawer contains 7 black socks, 5 white socks, and 3 brown socks. What is the probability that 2 white socks will be removed in succession?

*March 1, 2011*

**physics**

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.65 m and cross the bar with a speed of 0.75 m/s?

*March 1, 2011*

**Quantitative methods**

Assignment Problem 1* Print Media Advertising (PMA) has been given a contract to market Buzz Cola via newspaper ads in a major southern newspaper. Full-page ads in the weekday editions (Monday through Saturday) cost $2000, whereas on Sunday a full-page ad costs $8000. Daily ...

*February 27, 2011*

**Physics**

What is the time lapse between seeing the lightning strick and hearing the thunder 17 km away

*February 23, 2011*

**physics**

A mass of 0.755 kg is attached to a horizontal spring of constant 403 N/m as shown. The system is compressed a distance xa = 20.8 cm from its equilibrium position and released from rest. The coefficient of friction on the surface is μ = 0.354. The mass comes to rest again...

*February 23, 2011*

**Physics**

emily, the question is 72 CM, not 72 meters. convert the 72cm into .72m. (mass) X (Speed)2/(distance .72) - (mass)(gravity) for the other other one add the two together.

*February 22, 2011*

**Physics**

Use the kinematic equation v^2=u^2+2ax When you find the acceleration multiply it by the mass of the block on the table

*February 20, 2011*

**Math**

two people aged 15 and 50. At some point during their lives, the elder will be three times the age of the younger. Write an equation which models how old in years each will be when the elder will be three times as old as the younger person.

*February 20, 2011*

**PHYSICS**

A copper vat is 10 m long at room temperature (20 degrees C). How much longer it is when it contains boiling water at 1 atm pressure? Air in a balloon does 50 J of work while absorbing 70 J of heat. What is its change in internal energy? A bottle containing 3 kg of water at a ...

*February 17, 2011*

**Math**

Determine whether u and v are orthogonal,parallel, or neither. u=-2i+j v=3i+6j

*February 16, 2011*

**Math**

An airplane has an airspeed of 724 kilometers per hour at a bearing of 30 degrees.The wind velocity is 32 kilometers per hour from the west. What are the groundspeed and the direction of the plane?

*February 16, 2011*

**General Chemistry 1**

If you heat copper sulfate pentahydrate to long or at too high of a temperature, what compound(s) is formed?

*February 14, 2011*

**math 2**

What is the scale factor for 1 inch = 20 feet?

*February 10, 2011*

**Calc**

derivative of (x^2+14)/x

*February 8, 2011*

**Chemistry**

the value 3.0x10^-5 was wrong for me?

*February 8, 2011*

**Calculus-particle motion**

1. A particle is moving on the x-axis (or any number line) Its position x(t), or distance from the origin, at the time t is given by x(t)=4t^3-16t^2+15t. t is greater than or equal to 0 a.) Where is the particle when it is at rest? b.) During what time interval is the particle...

*February 7, 2011*

**Biology**

In a cell undergoing meiosis, which sequence of events is shown in correct order? A. the cytoplasm divides, chromosomes line up at the equator, nuclear envelope forms. B. chromosomes become visible, chromosomes line up at the equator, chromosomes gather at the poles of the ...

*February 4, 2011*

**Physics**

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of the crate at the bottom of the ramp

*February 3, 2011*

**Physics-Help Please!!!**

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of th crate at the bottom of the ramp

*February 3, 2011*

**Physics**

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of th crate at the bottom of the ramp.

*February 3, 2011*

**Physics**

Marko 1.51^2 /g doesn't equal 2.2801g it equals 2.2801/g. So your answer is the reciprical of the right answer. Nice try though.

*February 3, 2011*

**algebra**

You have to subract the second equation from the first equation. Make sure to put the second equation in parenthases and distrbute the negative sign!

*February 2, 2011*

**chemistry**

An unknown metal will be used in this experiment. If you do not remove the moisture between trials houw would moisture effect the dendity in a graduated cylinder calculation?

*January 31, 2011*

**Dynamics**

Car A is moving at a constant speed Va=75 km/h, while car C is moving at a constant speed Vc=42 km/h on a circular exit ramp with radius p=80m. Determine the velocity and acceleration of C relative to A.

*January 30, 2011*

**Calc**

Suppose that a function f(125)=52 and f'(125)=4. Estimate f(123.5)

*January 29, 2011*

**Calc**

suppose that f(x) is a function of f(125)=52 and f'(125)=4. estimate f(123.5)

*January 29, 2011*

**chemistry**

How many molecules of ethane (C2H6) are present in 0.524 g of C2H6?

*January 28, 2011*

**Biology**

Which of the following statements about sexual and asexual reproduction is FALSE? A)Genetic diversity occurs in sexual reproduction. B)Asexually reproducing organisms can repair their own DNA. C)There are no special reproductive cells in asexual reproduction. D)A gametophyte ...

*January 28, 2011*

**12th grade chemistry**

If the reaction below proceeds with a 96.8% yield, how many kilograms of CaSO4 are formed when 5.27 kg SO2 reacts with an excess of CaCO3 and O2? 2 CaCO3(s) + 2 SO2(g) + O2(g) 2 CaSO4(g) + 2 CO2(g)

*January 27, 2011*