Monday

July 25, 2016
Total # Posts: 950

**chemistry**

To maintain the effectiveness of a buffer, relative concentrations of the acid and the conjugate base should not differ by a factor of 10. Based on this information, derive pH range within which the buffer can work effectively. I know that I have to use the HH equation, but I ...
*April 16, 2013*

**chemistry**

To maintain the effectiveness of a buffer, relative concentrations of the acid and the conjugate base should not differ by a factor of 10. Based on this information, derive pH range within which the buffer can work effectively. I know that I have to use the HH equation, but I ...
*April 16, 2013*

**Chemistry**

Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.
*April 16, 2013*

**Physics, diffraction, interference, help!**

3.Blue light (λ = 450 nm) shines on a diffraction grating that has 4000 lines/inch. A.Calculate the angle of the fourth-order image
*April 8, 2013*

**Physics, diffraction **

1. Yellow light of wavelength 580 nm shines on a diffraction grating with 4000 lines/cm. A.At what angles do the first-order and second-order maxima occur?
*April 8, 2013*

**physics**

Three different forces produce the same displacement: the vector Delta(r) starts at the left edge of your computer monitor and the tip points to the right edge of your monitor in a horizontal orientation. The first force has a magnitude of 10 N and it is pointing straight up, ...
*April 4, 2013*

**Math**

Yes IT IS!!100% correct good job!
*March 28, 2013*

**physics**

A 1.03 kg mass is attached to a spring of force constant 10.6 N/cm and placed on a frictionless surface. By how much will the spring stretch if the mass moves along a circular path of radius 0.525 m at a rate of 2.20 revolutions per second?
*March 18, 2013*

**physics**

You are in the lab with a 10 V battery. You have a 10 W light bulb and you want to put 1/2 A of current through the light bulb and 5 V across the light bulb. This will allow the light bulb to have a brightness proportional to 2.5 W. Assuming any resistors that you need, design...
*February 26, 2013*

**Calculus**

Never mind. I was able to figure it out.
*February 22, 2013*

**Calculus**

Find the derivative of f(x) = ln(13e^(5x) + 2)
*February 22, 2013*

**Physics**

A wire of cross-sectional area 5.00x10^-6 m^2 has a resistance of 1.75 ohm. what is the resistance of a wire of the same material and length as the first wire, but with a cross-sectional area of 8.75x10^-6 m^2? I really want to understand what to do here, so detailed steps ...
*February 12, 2013*

**Algebra**

A trapezoid when its height is h and the lengths of its bases are a and b. What is the area of a trapezoid when h = 6 meters, a = 5 meters, and b = 12 meters? Formula A = 1/2h(a+b) gives the area.
*February 12, 2013*

**School For Human Rights**

A student wants to prepare Halite. How much sodium can he use to completely react it with 30g of Chlorine gas?
*February 4, 2013*

**physics**

how much work (J) is done by friction when the mass is 150 kg and dragged for 10 m if the coefficient of sliding friction is .3?
*February 4, 2013*

**Algebra**

x-2y=.9 4x-3y=13.1 Solve using the substitution method.
*February 1, 2013*

** Algebra**

4x+y=42 6x-5y=50 Solve using the substitution method.
*February 1, 2013*

**math**

the product of three consecutive integers is 22 less than the cube of the middle integer. Find the integer.
*January 31, 2013*

**Geometry**

If you go to Eden a math tuition you will have the diagram for this question but if you do not there will be ... LET ME JUST GET TO THE QUESTION Question: what is the measure of MQ in the diagram shown?
*January 25, 2013*

**floral design**

One of your friends who works at a local public TV station knows that you wish to break into event-floral designing. She attended a party last week for which you had created an amazing set piece that surrounded a small dance floor. Impressed with your work, she asks you to ...
*January 24, 2013*

**Math**

Oh, never mind! 28 inches high /2 so you can find the area between ceiling and middle of painting.
*January 20, 2013*

**Math**

Oh, never mond! 28 inches high /2 so you can find the area between ceiling and middle of painting.
*January 20, 2013*

**Math**

Ughh....
*January 20, 2013*

**Math**

Hhow'd you get 14 inches though?
*January 20, 2013*

**Design **

What is the difference between the vegetative style and the landscape style of flower arranging? A. Vegetative arrangements group same-season flowers together, while landscape arrangements don't. B. The vegetative style features flowers as they're found in nature, ...
*January 16, 2013*

**Design **

Which design style encourages a complete manipulation of floral materials into unnatural geometric shapes and colors? A. Abstract B. New convention C. Ikebana D. New wave im thinking B
*January 16, 2013*

**Design **

What is the difference between layering and terracing? A. More depth can be achieved with layering than with terracing. B. In layering, the materials are more three-dimensional than in terracing. C. In layering, materials such as leaves can't be reversed to reveal ...
*January 16, 2013*

**Design **

_______ refers to the process of tying materials together to hold them in place in an arrangement. A. Binding B. Clustering C. Banding D. Grouping
*January 16, 2013*

**Physics**

A car traveling at 20 m/s accelerates at 7 m/s2 for 3 sec. How fast is it now traveling? Please help!
*January 15, 2013*

**Trigonometry**

In 2010, the population of a country was 70 million and growing at a rate of 1.9% per year. assuming the percentage growth rate remains constant express the population P, as a function of t, the number of years after 2010.
*January 15, 2013*

**Math**

The answer is... Wait, I think I just forgot. Ohh.... Never mind! The answer is: The test scores are 34,56,78,98. So the fourth test score is 98. Hope this helped
*January 4, 2013*

**Heat Capacity**

When a 3.25 g sample of solid sodium hydroxide was dissolved in a calorimeter in 100 g of water, the temperature rose from 23.9 C to 32.0 C. Calculate delta H (in kJ/mol) of for the solution process: NaOH (s) -> Na+(aq) + OH-(aq) Use a calorimeter heat capacity of Ccal = 15...
*December 18, 2012*

**Math**

-1/(x^3)-27 or -1=A(x^2+3x+9)+Bx+C(x-3) I'm trying to find the partial fraction decomposition. I think A=-1/21, but how do I find the right values to plug in for x to find B and C?
*December 17, 2012*

**Physics**

If you throw a ball straight upward at a speed of 24 m/s, how long will it take to reach zero speed? How long will it take to return to its starting point? How fast will it be going when it returns to its starting point?
*December 12, 2012*

**Math**

Just glancing at the problem makes me think 31.... idk
*December 5, 2012*

**English - writing**

Is this a run-on sentence? Though I do believe we need to be useful, honorable, and compassionate to live a successful life, I would argue that the purpose of life is to be happy, but only through the aforementioned requirements can we achieve happiness, and thus, we may “...
*November 28, 2012*

**Physics**

Suppose there is a small hole (radius=0.0203) at the base of a large tank. If the height of water in the tank is 15m (a) what is the speed of water escaping through the hole? (b) Calculate the amount of water (in cubic meters per second) escaping the tank.
*November 27, 2012*

**chemistry**

5.49atm
*November 26, 2012*

**math**

How would you condense a logarithm expression into a single quantity if the logs have different bases?
*November 20, 2012*

**algebra**

What is (-2)^2 (-3)^2
*November 19, 2012*

**Math**

Theater has 108 seats, which are arranged in rows. The number of seats in each row is 3 less than the number of rows. How many rows of seats are in the theater.
*November 14, 2012*

**algebra**

Y^2-y-6
*November 14, 2012*

**Business Calc **

Determine when, to the nearest year, $3,000 invested at 5% per year, compounded daily, will be worth $10,000.
*November 8, 2012*

**Math**

Suppose that ln2=r. Use properties of logarithms to write the logarithm in terms of r. ln32=__
*November 7, 2012*

**english**

1. What about Thoreau’s night in jail made him angry? (1 point) The fact that his stay in prison was too short to make a point. The interference with his protest. The uncomfortable accommodations. 2. Why do the playwrights refer to their protagonist as “The Now ...
*November 7, 2012*

**algebra**

7 nickels to 22 dimes
*November 4, 2012*

**health**

it should actuly have been c. I think your original answer was correct
*November 2, 2012*

**Math**

How do you simplify this? (x+3/x-6)-2/(x+3/x-6)+8
*October 29, 2012*

**math**

4((x/4)+5)-20 How do you solve this for x?
*October 29, 2012*

**English.**

2. worse than before he talked to virgil
*October 28, 2012*

**chemistry**

How many kilojoules of heat are released when 38.6g of CH4 reacts completely with O2 to form CH3OH at constant pressure?
*October 28, 2012*

**Health**

its d
*October 24, 2012*

**math**

(X`2-7x+10x`3+1) ÷(2X-1)
*October 24, 2012*

**College Physics**

two motorcycles of equal mass collide at a 90 deg. intersection. if the momentum of motorcycle A is 450 kg km/h west and the momentum of motorcycle B is 725 kg km/h south, what is the magnitude of the resulting momentum of the final mass?
*October 9, 2012*

**math**

The length of a rectangular area is 3 feet less than twice its width. The perimeter of the rectangle is 132 feet. Find the length and width of the rectangular area
*October 3, 2012*

**math**

Faye is making 13 bows to sell at the annual craft fair. She has 36 feet of ribbon to make her bows. If each bow requires 2 1/4 feet of ribbon will not be used
*September 27, 2012*

**public finance**

Your annual income is $50,000. You want to take out a mortgage loan to buy a house. The rule on mortgage loan requires that your annual mortgage payment cannot exceed 30% of your annual income. If the current interest rate is 5% for a 30-year mortgage loan, what is the maximum...
*September 26, 2012*

**public finance **

If the current interest rate is 5% for a 30-year mortgage loan, what is the maximum amount one can borrow for a house?
*September 26, 2012*

**College algebra**

Find the maximum value of: y=-3x^2 -15x +1
*September 26, 2012*

**math**

Prime & composite numbers explain
*September 26, 2012*

**Chemistry**

Calculate the quantity of cold water assuming that 50mL of cold water weighs 50g.
*September 20, 2012*

**health**

Its d
*September 18, 2012*

**Psyhology**

Why is it important to consider non-verbal communication from a cultural perspective when performing a patient diagnosis?
*September 9, 2012*

**earth science **

What are 10 facts about hurricane Isaac?
*September 7, 2012*

**lincoln high**

The mean hours of internet usage by adult in the US is claimed to be 25 hours per week. A hypothesis test is performed at a level of significance of 0.05 with a p-value of 0.08. Choose the best interpretation of the hypothesis test.
*August 30, 2012*

**Health**

Its C, as logic should dictate
*August 30, 2012*

**statistics**

In a time-use study, 20 randomly selected managers were found to spend a mean of 2.40 hours each day on paperwork. The standard deviation of the the 20 scores is 1.30. Also, the sample data appear to have a bell-shaped distribution. Construct the 95% confidence interval for ...
*July 30, 2012*

**psychology**

Dr. Marquette is a researcher who studies the encoding, storage, and retrieval of information throughout life. What approach to cognitive development does she take?
*July 23, 2012*

**phsycs**

50.7
*July 19, 2012*

**Volume **

Find the volume of the solid generated by revolving the region bounded by the given curves and line about the y-axis. y=50-x^2 y=x^2 x=0
*July 19, 2012*

**Finance**

YOU DEPOSIT $5,000 INTO THE FIRST NATIONAL BANK OF FIN 301 AND EARN 2.5% COMPOUNDED CONTINUOUSLY. HOW MUCH WILL YOU HAVE IN 5 YEARS?
*June 25, 2012*

**Physics**

The pressure-volume graph shows an engine cycle where the working substance is an ideal monatomic gas (γ = 5/3). The process A-B is adiabatic. At point A, the pressure is 2.70×105 Pa and the volume is 0.0180 m3. At point B, the volume is 0.0450 m3. During a cycle, ...
*June 25, 2012*

**Physics**

A block on a spring moves in SHM with amplitude 0.23 m and period 3.8 s. The mass of the block is 2.1 kg. What is the total energy of the system?
*June 24, 2012*

**Physics**

Susie is out fishing on a calm, sunny day. She hooks an old tire that is resting on the lake bottom, and hauls it into her boat. In principle, how does the water level of the lake change?
*June 24, 2012*

**Physics**

Thanks
*June 24, 2012*

**Physics**

The hammer throw is a track-and-field event, popular in Scotland, in which a ball on a rope (the "hammer") is whirled around the thrower in a circle before being released. The goal is the send the ball as a projectile as far down the field as possible. At a track ...
*June 24, 2012*

**Physics**

A bouncing ball returns to the same height each time. Is this an example of simple harmonic motion? Explain your answer.
*June 18, 2012*

**Physics**

15.0 meters from a sound source that radiates freely in all directions, the intensity is 0.00230 W/m2. What is the rate at which the source is emitting sound energy?
*June 18, 2012*

**Physics**

Two waves travel in the same medium at the same speed. One has wavelength 0.0382 m and frequency 9.67×106 Hz. The other has wavelength 0.0486 m. What is the period of the second wave?
*June 18, 2012*

**Physics**

A shipwrecked mariner is stranded on a desert island. He seals a plea for rescue in a 1.00 liter bottle, corks it up, and throws it into the sea. If the mass of the bottle, plus the message and the air inside, is 0.454 kg, what percentage of the volume of the bottle is ...
*June 17, 2012*

**Physics**

A cylindrical metal can with a radius of 4.25 cm is floating upright in water. A rock is placed in the can, causing it to sink 0.0234 m deeper into the water. What is the weight of the rock?
*June 17, 2012*

**Chemistry**

Neon gas produced for use in luminous tubes comes packaged in 1.0-L containers at a pressure of 1.02 atm and a temperature of 24°C. How many moles of Ne do these cylinders hold?
*June 17, 2012*

**Physics**

A 0.95 m rod with uniform mass distribution runs along the x axis with its left end at the origin. A 1.8 m rod with uniform mass distribution runs along the y axis with its top end at the origin. Find the coordinates of the center of gravity for this system.
*June 10, 2012*

**Physics**

A dancer completes 3.8 revolutions in a pirouette. What is her angular displacement? In Rad.
*June 10, 2012*

**Chemistry**

Never mind figured it out!!! Now to work on the rest of my questions!! if anyone needed help on this just take off one H on the end and add a - so it would be CH3CH2CH2CH2CH2CO2-
*June 9, 2012*

**Chemistry**

One of the substances that give wet goats and dirty gym socks their characteristic odors is hexanoic acid, CH3CH2CH2CH2CH2CO2H, which is a monoprotic weak acid. (a) Write the formula for the conjugate base of this acid.
*June 9, 2012*

**Chemistry**

That is what I thought was the answer. I am taking classes online and each time I put the equation in the chemPad it tells me "Your answer contains an ambiguous or incomplete reaction equation. Check all the components on the product-side of the equation."
*June 9, 2012*

**Chemistry**

Iodine pentafluoride is an incendiary agent, a substance that ignites combustible materials. This compound is usually made by passing fluorine gas over solid iodine, but it also forms when iodine monofluoride changes into the element iodine and iodine pentafluoride. (a) Write ...
*June 9, 2012*

**Chemistry**

What is the molarity of a solution made by dissolving 32.654 g of aluminum sulfate, Al2(SO4)3, in water and diluting with water to 125.0 mL total?
*June 9, 2012*

**Physics**

How far is the center of mass of the Earth-Moon system from the center of the Earth? The Earth's mass is 5.97×1024 kg, the Moon's mass is 7.4×1022 kg, and the distance between their centers is 3.8×108 m.
*June 4, 2012*

**Physics**

The uniform sheet of siding shown has a centrally-located doorway of width 2.0 m and height 6.0 m cut out of it. The sheet, with the doorway hole, has a mass of 264 kg. (a) What is the x coordinate of the center of mass? (b) What is the y coordinate of the center of mass? ...
*June 4, 2012*

**Physics**

12 x 12
*June 3, 2012*

**Math**

2. The length of time that it takes for a pendulum to make one complete swing depends on the length of the pendulum. The time in seconds, T, is related to the length in metres, L, through the equation T = 2π√(L/9.8) c. Graph this function for pendulums up to 20m in ...
*May 28, 2012*

**Chemistry**

How many mls of .1M KOH would it take to neutralize 75 mls of .07M CH3COOH?
*May 20, 2012*

**accounting**

On January 1, 2008 Touring company agreed to buy some equipment from Jones Company. Touring company signed a note,agreeing to pay Jones company $500,000 for the equipment on December 31, 2010. The market rate of interest for this note was 10%. a. Prepare the journal entry ...
*May 2, 2012*

**Discreet MAth**

Because the president saw the chocolate and he said chocolate and that is how its chocolate
*May 2, 2012*

**Grammar basic English**

Identify the preponsition in the folloing sentence: (You can't live your life hiding in your room all day.)
*May 2, 2012*

**Chemistry - Equilibrium Constant**

Determine the value of the equilibrium constant (Kp) at 800. K and 1 atm pressure. SbCl3(g) + Cl2(g) -> SbCl5(g) Delta G(o)f (SbCl5) = -334.34 kJ/mol Delta G(o)f (SbCl3) = -301.25 kJ/mol Delta H(o)f (SbCl5) = -394.34 kJ/mol Delta H(o)f (SbCl3) = -313.80 kJ/mol I got a K ...
*April 26, 2012*

**physics**

An athlete swings a 4.30 kg ball horizontally on the end of a rope. The ball moves in a circle of radius 0.790 m at an angular speed of 0.590 rev/s. (a) What is the tangential speed of the ball? m/s (b) What is its centripetal acceleration? m/s2 (c) If the maximum tension the ...
*April 16, 2012*

**chemistry **

what is the final molarity when 250ml 0.45M is mixed with 350mL water
*April 2, 2012*