Wednesday

September 28, 2016
Total # Posts: 1,042

**Chemistry**

Calculate the energy change associated with the transition of an electron from the n=2 shell to the n=5 shell in a Bohr hydrogen atom.

*November 18, 2012*

**math**

the width in cm of a rectangle is the same as the slope of the line 5x-6y=-14, and its length in cm is the same as the slope of the line that is perpendicular to the line 9x+4y=87. Find the perimeter of the rectangle.

*November 17, 2012*

**math**

the width in cm of a rectangle is the same as the slope of the line 5x-6y=-14, and its length in cm is the same as the slope of the line that is perpendicular to the line 9x+4y=87. Find the perimeter of the rectangle.

*November 17, 2012*

**math**

Find the equation of the line that passes through the points (2/3, -5/4)and (-3, -5/6). Write the answer in slope-intercept form and standard form with integer coefficients. Thank you.

*November 16, 2012*

**math**

If there are 8 boys and 9 girls in a classroom , what is the ratio of boys to girls ?

*November 6, 2012*

**History**

What made iroquois headwomen different from regular Iroquois woman

*November 3, 2012*

**mg495**

You learn that 25 percent of the cost of goods sold and operating expense figures for 2009 are fixed costs that will not change in 2010. Reconstruct the pro forma income statement.

*November 1, 2012*

**akgebra**

when do you reverse an inequality sign?

*October 31, 2012*

**CHEMISTRY**

Are you always solving for final volume in the combined gas law?

*October 23, 2012*

**Physics**

2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.

*October 23, 2012*

**College Physics**

A uniform horizontal rod of mass M and length l rotates with angular velocity w (omega) about a vertical axis through its center. Attached to each end of the rod is a small mass m. Determine the angular momentum of the system about the axis. Write you're answer in terms of...

*October 20, 2012*

**English grammar **

"Will you lend me seven dollars for my lunch today? " asked Shannon. Is there a question mark after today or a comma

*October 18, 2012*

**finance**

a company paid dividend of $7 per share and has announced that it will increase the dividend by $4 per share each of the next 4 years and then never pay another dividend again. the required rate of return is 11 percent on the company's stock. How much will you pay today?

*October 17, 2012*

**algebra**

need the answers dumby

*October 15, 2012*

**physics**

An arrow is shot horizontally from a 50 m cliff with a velocity of 15 m/s. As the arrow travels in its parabolic path, its new height some time later, is 24 m. Calculate the instantaneous velocity of the moment it reaches is new height.

*October 15, 2012*

**Word study slash english**

What are some words with the ay slash igh sound

*October 7, 2012*

**english**

how would you divide the following verse of scripture: "For I have not shunned to declare unto you all the counsel of God." like this: For I have not shunned to declare unto you all / the counsel of God. or For I have not shunned to declare unto you / all the counsel...

*October 3, 2012*

**math**

but what about the quantity of cards in each pile? figuring out that each pile adds up to 50 is the easy part!

*October 2, 2012*

**Maths**

Keith and Shawn each have some money. If Keith spends $38, the ratio of the amount of money Keith has to the amount of money Shawn has will become 2:5. If Shawn spends $38, the ratio will become 8:13. How much money does each boy have?

*October 2, 2012*

**Maths**

The ratio of the number of cheesecakes to the number of mango cakes was 3:2. After Baker Lam sold 144 cheesecakes, the ratio became 3:5. A) How many cheesecakes did Baker Lam bake at first? B)Baker Lam decided to deliver the remaining cakes to 4 charity homes. How many cakes ...

*October 2, 2012*

**math**

Booty

*September 30, 2012*

**math**

a baseball diamond is actually a square. the distance between bases is 90 feet. when a runner on first base tries to steal second, a catcher has to throw from home to second base.how far is it between home and second base?

*September 18, 2012*

**math**

a 25 foot ladder leans against the wallit touches the wall 24 feet off the ground if you slide the base of the ladder back 10 feet off the ground how far does it slide down the wall?

*September 13, 2012*

**math**

im confused how do u get 7

*September 13, 2012*

**math**

but there is an extra number

*September 13, 2012*

**math**

a 25 foot ladder leans against the wallit touches the wall 24 feet off the ground if you slide the base of the ladder back 10 feet off the ground how far does it slide down the wall?

*September 13, 2012*

**Chemistry**

How many moles of H2PO4 and HPO4 would be needed to prepare 1.0 L of a 0.01M phosphate buffer with a pH of 6.82? Use the Henderson-Hasselbalch equation. pH = pKa + log (base)/(acid). Thank you, but I guess what my question should have been is what is the acid in this question ...

*September 5, 2012*

**Chemisty**

Thank you, but I guess what my question should have been is what is the acid in this question and what is the base. I would assume that both H2PO4 and HPO4 are acids and phosphate is the base but Im not sure.

*September 5, 2012*

**Chemisty**

How many moles of H2PO4 and HPO4 would be needed to prepare 1.0 L of a 0.01M phosphate buffer with a pH of 6.82?

*September 5, 2012*

**Calculus**

explain why f(x)=(1)/(x^2-9) is discontinoues at x=-3

*September 4, 2012*

**Managerial Accounting**

Sandusky Inc. has the following costs when producing 100,000 units: Variable Costs $400,000 Fixed Costs 600,000 An outside supplier is interested in producing the item for Sandusky. If the item is producing outside, Sandusky could use the released production facilities to make...

*September 4, 2012*

**math**

mathematically Evaluate without using tables 2 log base 10 raised 2 power 5 + log base 10 36 - log base10 9 that is, 2log10 5 +log 10 36 - log 10 9

*August 15, 2012*

**Math**

Function Table X. Y 0.5. 2 1. 1 2. 0.5 4. 0.25 5 10 What is the function rule that represents the relationship between x and y.

*August 14, 2012*

**math**

assume that a sample is used to estimate a population proportion p. find the margin of error E that corresponds to the given statistics and confidence level. 98% confidence, the sample size is 780, of which 40% are successes what does that mean in English?

*July 22, 2012*

**Algebra 1**

On 2 investments totaling 15,00, peter lost 2% on one and earned 8% on the other. If his annual receipts were $204, how much was each investment?

*July 9, 2012*

**Algebra 1**

On 2 investments totaling 15,00, peter lost 2% on one and earned 8% on the other. If his annual receipts were $204, how much was each investment?

*July 9, 2012*

**physics**

Two identical cannons fire cannonballs horizontally with the same initial velocity. One cannon is located on a platform partway up a tower, and the other is on top, four times higher than the first cannon. How much farther from the tower does the cannonball from the higher ...

*June 15, 2012*

**physics**

4m/s

*June 13, 2012*

**algebra**

all two-digit numbers whose units digits is half the tens digit?

*June 5, 2012*

**algebra**

all two-digit numbers whose units digits is half the tens digit?

*June 5, 2012*

**Science**

A boy lift a box that weighed 40 newtons if the boy was 1.5 meter tall how much work did he do as he lift the box?

*June 1, 2012*

**chemistry**

briefly explain how to demostrate that all the reactants in a neutralization reaction has been used up

*May 30, 2012*

**Algebra**

A pizza place sells five topping pizzas with the following options. Crust: Classic, Crispy Toppings: Extra cheese, pepperoni, sausage, onions, banana peppers, jalapenos, tomatoes, fresh herbs, mushrooms, black olives. What is the probability that a customer will order a five ...

*May 24, 2012*

**ALGEBRA**

A car dealer will sell you a used car for $7,542 with $542 down and payments of $213.27 per month for 36 months. What is the APR? (Use the formula on page 156. Round each answer to the nearest tenth.)

*May 20, 2012*

**ALGEBRA**

If a business borrows $18,000 and repays $24,300 in 4 years, what is the simple interest rate?

*May 20, 2012*

**miss sue **

does this include the vowels

*May 19, 2012*

**hebrew basic**

we need to write on the computer the translation for careful speech we do not know how to use the keys to make the symbols help please

*May 19, 2012*

**ellipses**

8x^2+y^2+80x-6y+193=0 Find the center (which i think is (-5,3) Find the major axis Find the minor axis && find the distance from C to foci

*May 11, 2012*

**ellipses**

If the major axis is vertical and has a length of 10 units,the minor axis has a length of 8 units,and the center C=(4,-2).Fill in the missing denominators for the equation and determine the distance from C to the foci (c).

*May 11, 2012*

**geometry**

Between the points (8,-6) and (-8, 6) find A.) The distance (simplified radical form use sqrt(n). B.) The midpoint ( use ( , ) and .5 for 1/2. Separate answer with commas. Distance, midpoint

*May 8, 2012*

**ALGEBRA 2**

rewrite the quadratic equation y=-3x^2+3x+2 into standard form to determine the vertex --------, ---------, --------

*May 7, 2012*

**Algebra II**

A line of chorus girls, even though it doesn't make sense -.-

*May 5, 2012*

**MATH**

CAN 1/2 EVER BE GREATER THAN 1/4. IF NOT THEN WHY?

*May 3, 2012*

**Math**

Can 1/2 ever be greater than 1/4. Why.

*May 2, 2012*

**Algebra 2**

What is the equation of a parabola whose vertex is (5, -2) and whose graph is 6 times taller than y=x^2? Include y= as part of your answer

*May 2, 2012*

**Physics**

A small 0.499 kg object moves on a frictionless horizontal table in a circular path of radius 0.96 m. The angular speed is 6.37 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the circle. Someone under...

*April 23, 2012*

**Physics**

A small 0.499 kg object moves on a frictionless horizontal table in a circular path of radius 0.96 m. The angular speed is 6.37 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the circle. Someone under...

*April 23, 2012*

**GRAMMAR**

WHAT IS THE ADJECTIVE AND NOUN IN THE SENTENCE: THREE GUESTS BRING GUITARS. Thank you Daniel

*April 19, 2012*

**Pre-Calc Help**

Evaluate the expression under the given conditions. (show work please) sin(A-B); tan A=12/5, A in quadrant 3, sinB=-3sqrt(10)/10, B in quadrant 4.

*April 19, 2012*

**Math**

A ladder is placed 6 ft aainsgt a 25 ft building. How high above the ground does the ladder touch the wall?

*April 16, 2012*

**life orientation**

in 10-15 lines critically discuss 5 ways in which the human or environmental problem impacts on the community.provide relevant sources to support your claims?

*April 16, 2012*

**physics**

If a lead bullet goes fast enough, it can melt completely when it comes to a halt suddenly, and all it's kinetic energy is converted into heat via friction. Find the minimum speed of a lead bullet (initial temp. = 30.0 C) needed for this to happen. So I related that Q = KE...

*April 15, 2012*

**Social Studies**

south

*April 12, 2012*

**english**

I dont know how to start it and i basically dont know how to do it.. or even what to put..

*April 10, 2012*

**ALGEBRA**

(a) Simplify the expression. 3(x - 2) - 9(x**2 + 7 x + 4) - 5(x + 8) (a) Simplify the expression.

*April 9, 2012*

**ALGEBRA**

Solve the system. $ \left\{ \begin{tabular}{l} $ y = x + {\color{red}-2} $ \\ $ y = -{\color{red}3} x + {\color{red}10} $ \end{tabular} \right. $

*April 8, 2012*

**ALGEBRA**

Find three ordered pairs that satisfy the equation. y = 5 x - 4

*April 8, 2012*

**ALGEBRA**

Find the functional values requested in the problem. h(x)=5 x-1

*April 8, 2012*

**physics**

An object is located 30 cm to the left of a converging lens whose focal length is 50 cm. (a) Draw a ray diagram to scale and from it determine the image distance and the magnification. (b) Use the thin lens and magnification equations to verify your answer to part (a). I am ...

*March 20, 2012*

**math**

Ross ran a mile in 6.28 minutes to win a race.Don finished second with a time of 6.55 minutes.How much faster was Ross than Don?

*March 19, 2012*

**physics**

A convex mirror in an amusement park has a radius of curvature of 3.00m. A man stands in front of the mirror so that his image is half as tall as his actual height. At what distance must the man focus his eyes in order to see his image? I calculated the focal length using f...

*March 17, 2012*

**physics**

The drawing shows a copper wire (negligible resistance) bentinto a circular shape with a radius of 0.48 m. The radial sectionBC is fixed in place, while the copper bar ACsweeps around at an angular speed of 16 rad/s. The bar makeselectrical contact with the wire at all times. ...

*March 12, 2012*

**calculus**

I'm confused as to how you got d =2 and x=sqrt(3)

*March 4, 2012*

**calculus**

A plane flying horizontally at an altitude of 1 mi and a speed of 500 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 2 mi away from the station. I drew a diagram and figured out I need to ...

*March 4, 2012*

**chemistry**

A buffer is prepared by adding 300.0 mL of M NaOH to 400.0 ML of 2.0 M CH3COOH. What is the pH of this buffer? ks=1.8X10^-5

*March 4, 2012*

**calculus**

Alright thanks

*March 3, 2012*

**calculus**

Implicit Differentiation question x^y = y^x I was wondering if I was right in the steps I was taking first was to take the Ln or both sides making it y Ln(x) = x Ln(y) then just taking the derivatives of both sides using product rule twice y/x + y'Ln(x) = xy'/y + ln(y...

*March 3, 2012*

**physics**

What is the kinectic energy of a body of mass 2000kg moving with a velocity of 10m/s

*February 29, 2012*

**physics**

A rectangle has a length of 2d and a height of d. Each of the following three charges is located at a corner of the rectangle: +q1 (upper left corner), +q2 (lower right corner), and -q (lower left corner). The net electric field at the (empty) upper right corner is zero. Find ...

*February 22, 2012*

**math**

how can you use subtraction to complete a addition pattern.

*February 19, 2012*

**physics**

remove the brackets to see the diagram sorry

*February 19, 2012*

**physics**

Five styrofoam balls are suspended from insulating threads.Several experiments are performed on the balls and the followingobservations are made: I. Ball A attracts B and repels C II. Ball D attracts B and has no effect on E III. A negatively charged rod attracts both A and E ...

*February 19, 2012*

**physics (Right Hand Rule Question)**

A proton traveling due east in a region that contains only a magnetic field experiences a vertically upward force away from the surface of the earth. What is the direction of the magnetic field? a)North b)East c)South d)West e)Down I know I need to use the right hand rule to ...

*February 17, 2012*

**physics**

Thanks for the help, but I don't quite understand why you chose to multiply everything together.

*February 16, 2012*

**physics**

A proton moves in a constant electric field from point A to point B. The magnitude of the electric field is 6.4 × 10^4 N/C; and it is directed as shown in the drawing, the direction opposite to the motion of the proton. If the distance from point A to point B is 0.50 m, ...

*February 16, 2012*

**Finance**

What is the economic value today of each of the following payment streams if money can earn 7.5%?(Note that the two streams have the same total nominal value.) a. $1000, $3000, and $2000 due in one, three, and five months, respectively. b. Two $3000 payments due two and four ...

*February 14, 2012*

**literature**

Dez sweaty Testicles

*February 14, 2012*

**College Algebra**

Find the value of the missing variable P=4s ; s=32

*February 9, 2012*

**Chemistry**

When 0.100 mol of CaCO3 (s) and 0.100 mol of CaO (s) are placed in an evacuated container with a volume of 10.0-L and heated to 385 K, PCO2 = 0.220 atm after equilibrium is established: CaCO3(s) ⇌ CaO (s) + CO 2 (g) An additional 0.300 atm of CO2 (g) is pumped in. What ...

*February 9, 2012*

**Chemistry**

As an environmental chemist, you want to find the Kc for the following reaction: 2 NO2 (g) ⇌ N2 (g) + O2 (g) Kc = ? Use the following data to find the unknown Kc : ½ N2(g) + ½ O2(g) ⇌ NO (g) Kc = 4.8 x 10-10 2 NO2(g) ⇌ 2 NO (g) + O2 (g) Kc = 1.1...

*February 9, 2012*

**arithmetic**

The sum of the first 10th term of an a.p is 255,the sum of the first 20 term is 1010.find the next 2020 term of the progression

*January 31, 2012*

**Physics**

A cheetah running at 30 m/s is pursuing a zebra going in a straight line at 14 m/s. If the zebra has a 35 m head start, how much time does it take for the zebra to catch up? (Please show all work. I know the answer, but I need the step by step instruction to understand.)

*January 30, 2012*

**calculus**

Consider the function f(x) = piecewise [(x^3)(cos(1/x)) , x=/=0], [0, x=0]. Use the definition of the derivative at a point to determine if f is differentiable at x=0 I am not sure how to start this question. Am I supposed to plug in x = 0?

*January 29, 2012*

**physics **

A student tries to produce notes of higher frequency by blowing a trumpet harder Discuss whether he will succeed?

*January 29, 2012*

**math**

700.00

*January 25, 2012*

**Physics**

workings

*January 23, 2012*

**math**

explain the difference between the expressions x-3 and 3-x

*January 20, 2012*

**Help!!!**

the angle of elevation from the top of an office building in makati to the sm appliance center is 68 degree , while the angle of depression from the top of the office building to the bottom is 63 degree the office building is 290 feet from the sm appliance center. find the ...

*January 19, 2012*

**geometry**

given: 12x over 8+17=117 prove: x=150

*January 18, 2012*

**geometry**

given: 4x+8 over 2 equals 9 prove: x= 5 over 2

*January 18, 2012*