Friday

October 28, 2016
Total # Posts: 1,201

**statistics**

I need to prove this σ(hat)^2(x,y) = (1/n) Σ (Xi - X (bar) ) Yi using σ(hat)^2(x,y)= (1/n) Σ (Xi - X(bar)) (Yi-Y(bar)) and X(bar)= (1/n) Σ Xi σ(hat)^2 (x,y) is the estimator of covariance

*February 13, 2011*

**physics**

A block of mass m is dropped from the fourth floor of an office building and hits the sidewalk below at speed v. From what floor should the mass be dropped to double that impact speed?

*February 11, 2011*

**programming in c**

write a program to compute in centimeters of a steel rod

*February 4, 2011*

**physics**

A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 118-kg laser sensor that measures the thickness of the ice (see the drawing). The helicopter and the sensor both move only in the horizontal direction and have a horizontal acceleration of ...

*February 4, 2011*

**math**

816 357 492

*February 1, 2011*

**Physics**

A 2.0 kg ball and a 3.5 kg ball are connected by a 2.0 m long rigid, massless rod. The rod and balls are rotating clockwise about its center of gravity at 21 rpm . What torque will bring the balls to a halt in 6.0s?

*January 31, 2011*

**economics**

How would you illustrate the impact of each of the following events on a production possibilities curve for factory goods and farm goods? (a) the computer is invented (b) 1 million farm workers remain unemployed for six months (c) a drought

*January 31, 2011*

**physics**

If an impulse of 60 Ns is required to stop and object, list in your log three force and time combinations that can stop an object.

*January 30, 2011*

**Chemistry**

How much energy (in kilojoules) is released when 12.8 g of steam at 130.0 C is condensed to give liquid water at 73.5 C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K*Mol)for the liquid and 33.6 J/(K*Mol) for the vapor.

*January 24, 2011*

**Probation**

Write a 750- to 1,000-word paper in APA format in which you assess the effectiveness of probation. In your paper you must address the following: •Define probation as a sentence. •Explain the probation process. •Explain your findings within each researched item ...

*January 22, 2011*

**mat h**

ms. buxx invested a total of $2000 in two savings accounts. The first account pays 3% interest per year and the second account pays 5% interest per yera. If the interest from both accounts totals $84 per yera, how much is invested in each account?

*January 17, 2011*

**physics**

A motorist drives along a straight road at a constant speed of 15.0 m/s. just as she passes a parked police officer,the officer starts to accelerate at 2.00 m/s^2 to overtake her. assuming the officer maintains this acceleration, a) determine the time it takes the police ...

*January 17, 2011*

**physics**

A motorist drives along a straight road at a constant speed of 15.0 m/s. just as she passes a parked police officer,the officer starts to accelerate at 2.00 m/s^2 to overtake her. assuming the officer maintains this acceleration, a) determine the time it takes the police ...

*January 16, 2011*

**Fin- Management**

$5.17

*January 13, 2011*

**Fin- Management**

David purchased a $100,000 participating whole life policy. The annual premium is $2,280. Projected dividends for the first 20 years are $15,624. The cash value after 20 years will be $35,260. If the premiums were invested at 5 percent for 20 years, the premiums would grow to...

*January 13, 2011*

**Statistics**

a player have to pick six number from 1 to 30 how many diffrent choice does the player have

*January 13, 2011*

**ChemistryDrBob222**

Concentrated sulfuric acid is 18.4 molar and has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar the solution has a density of 1.38 grams per milliliter. This concentration of H2SO4 is often used in lead storage batteries(like a car battery). 1....

*January 13, 2011*

**ChemistryDrBob222**

Concentrated sulfuric acid is 18.4 molar and has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar the solution has a density of 1.38 grams per milliliter. This concentration of H2SO4 is often used in lead storage batteries(like a car battery). 1...

*January 13, 2011*

**math**

A matrix A is said to be skew symmetric if A^T = -A. Show that is a matrix is skew symmetric then its diagonal entries must all be 0. A^T meant to be A transpose.

*January 11, 2011*

**math**

give two ways to show dollar to 2.65?

*January 10, 2011*

**Chemistry**

Concentrated sulfuric acid is 18.4 molar and has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar the solution has a density of 1.38 grams per milliliter. This concentration of H2SO4 is often used in lead storage batteries(like a car battery). 1....

*January 9, 2011*

**art history**

name four concepts or subjects on which renaissance artists based their works

*December 28, 2010*

**5th grade math**

Please help with estimate and calculate quotients. I do not understand what magnitude estimate is and to circle a box between 0.1s 1s 10s 100s examples of what i mean are 6/78.6 3/387 29.52 divided by 8 989 divided by 43 845 divided by 5 15.94 divided by 9 please help

*December 14, 2010*

**math **

fill in the blanks with the numbers so that the statement is true 2,3,4,7 (_ + _)2 + _ x _ = 53

*December 13, 2010*

**Finance**

A U.S.-based firm is planning to make an investment in Europe. The firm estimates that the project will generate cash flows of 200,000 euros after one year. If the one-year forward exchange rate is $1.40/euro and the dollar cost of capital is 9%, what is the present value (PV...

*December 13, 2010*

**Gen Chemistry**

The following absorption data of a solution was collected in a cell with 1 cm path length. The absorption of the same substance in a solution with unknown concentration was 0.197. What is the concentration of the unknown substance? c (M) A 1.00x10-3 0.119 2.00x10-3 0.243 3....

*December 12, 2010*

**Gen Chemistry**

i got the moles of Ca3(PO4)2=0.01275549 but how do i covert that to moles of CaCl2? using the stoichiometric ratio which is 1:1 or am i doing something wrong

*December 11, 2010*

**Gen Chemistry**

i got the moles of Ca3(PO4)2=0.01275549 but how do i covert that to moles of CaCl2? using the stoichiometric ratio which is 1:1 or am i doing something wrong

*December 11, 2010*

**Gen Chemistry**

52.8 mL of a calcium chloride solution with unknown concentration was treated with phosphoric acid to remove all of the calcium ions in the form of a precipitate. The precipitate was filtered, dried and was found to have the mass of 3.9565 g. What was the concentration of the ...

*December 11, 2010*

**chemistry Molarity**

You have 353 mL of a 1.25 M potassium Chloride solution, but you need to make a 0.50 M potassium Chloride solution. How many milliliters of water must you add to the original 1.25 M solution to make the 0.50 M potassium Chloride solution

*December 11, 2010*

**College Chemistry Really Need Help**

THE EQUILIBRIUM CONSTANT FOR A REACTION IS 2.48 AT 25 DEGREES CELSIUS. WHAT IS THE VALUE OF ΔG°(KJ)AT THIS TEMPERATURE? (R=8.314 J/K mol)

*December 7, 2010*

**Algebra**

Why do some regressions models give you r and some give you r squared? What does r squared tell you? If you take the square root of r squared for a model and get a number close to one does that mean that the closer the square root of r squared to one, it is the better model?

*December 7, 2010*

**chemistry**

describe the formation of a sr ion as its bons with chlorine to form SrCl2 and properties the compound will posess

*December 5, 2010*

**physics**

A box slides down a 33° ramp with an acceleration of 1.38 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.

*December 5, 2010*

**physics**

Thank You!

*December 2, 2010*

**physics**

A skater spinning with angular speed of 1.5 rad/s draws in her outstretched arms thereby reducing her moment of inertia by a factor a 3. a) Find her final angular speed. b)What is the ratio of her final angular momentum to her initial angular momentum? c) Determine the ratio ...

*December 2, 2010*

**physics**

A 4.5 kg bag of groceries is in equilibrium on an incline of angle θ = 55°. Find the normal force of the incline on the bag.

*December 2, 2010*

**Physics**

A 70 kg man just before contact with the ground has a speed of 5 m/s In a stiff-legged landing he comes to a halt in 7ms (miliseconds). Keeping in mind that the average net force acting on the man includes both the force of the ground on the man and the gravity force, find ...

*December 2, 2010*

**Physics**

A bicycle wheel of radius .7m is rolling without slipping on a horizontal surface with an angular speed of 2 rev/s when the cyclist begins to uniformly apply the brakes. The bicycle stops in 5s. Through how many revolutions did the wheel turn during the 5s of braking?

*December 2, 2010*

**Physics**

A 70 kg man just before contact with the ground has a speed of 5 m/s In a stiff-legged landing he comes to a halt in 7ms (miliseconds). Keeping in mind that the average net force acting on the man includes both the force of the ground on the man and the gravity force, find the...

*December 1, 2010*

**Physics**

A bicycle wheel of radius .7m is rolling without slipping on a horizontal surface with an angular speed of 2 rev/s when the cyclist begins to uniformly apply the brakes. The bicycle stops in 5 s. Through how many revolutions did the wheel turn during the 5 s of braking? I ...

*December 1, 2010*

**Finance**

Gemini Real Estate is offered a $2 million line of credit for four months at an APR of 9%. This loan has a loan origination fee of 1.5%. What is the actual four-month interest rate paid, expressed as an EAR

*December 1, 2010*

**Finance**

Crimini Foods is offered a $400,000 line of credit for six months at an APR of 10%. This loan has a loan origination fee of 2%. What is the actual six-month interest rate paid, expressed as an EAR

*December 1, 2010*

**Finance**

Carborundum Metals issues commercial paper with a face value of $1,000,000 and a maturity of three months. Carborundum receives net proceeds of $992,000 when it sells the paper. If the prime rate is 8% APR compounded quarterly, how much savings in interest did Carborundum ...

*December 1, 2010*

**Physics**

A 70 kg man just before contact with the ground has a speed of 5 m/s In a stiff-legged landing he comes to a halt in 7ms (miliseconds). Keeping in mind that the average net force acting on the man includes both the force of the ground on the man and the gravity force, find ...

*November 30, 2010*

**Physics**

A bicycle wheel of radius .7m is rolling without slipping on a horizontal surface with an angular speed of 2 rev/s when the cyclist begins to uniformly apply the brakes. The bicycle stops in 5 s. Through how many revolutions did the wheel turn during the 5 s of braking? I ...

*November 30, 2010*

**FINANCE**

Crimini Foods is offered a $400,000 line of credit for six months at an APR of 10%. This loan has a loan origination fee of 2%. What is the actual six-month interest rate paid, expressed as an EAR

*November 30, 2010*

**FINANCE**

Carborundum Metals issues commercial paper with a face value of $1,000,000 and a maturity of three months. Carborundum receives net proceeds of $992,000 when it sells the paper. If the prime rate is 8% APR compounded quarterly, how much savings in interest did Carborundum ...

*November 30, 2010*

**FINANCE**

Gemini Real Estate is offered a $2 million line of credit for four months at an APR of 9%. This loan has a loan origination fee of 1.5%. What is the actual four-month interest rate paid, expressed as an EAR

*November 30, 2010*

**Finance**

A firm issues three-month commercial paper with $200,000 face value and receives $192,000. What is the EAR the firm is paying for these funds? I WOULD BE HAPPY IF SOME ONE CAN RESPOND TO MY QUESTION IN NUMCERS.

*November 30, 2010*

**Physics**

A child rolls a ball on a level floor 3.4 m to another child. If the ball makes 9.0 revolutions, what is its diameter?

*November 25, 2010*

**Math**

A very strong girl runs 200 miles east for several hours. After a brief rest she runs another 100 miles north. She stops for the night at a local bed and breakfast and the next morning walks 75 miles directly south-east. Find the magnitude and direction of her displacement.

*November 23, 2010*

**6th grade**

well there are several anwers to this problem, actually. here they are: 6.0831 6.0832 6.0833 6.0834

*November 22, 2010*

**Physics**

find the deceleration of a cyclist reduces from 2.5m/s to 1.0 m/s in 12s?

*November 21, 2010*

**Chemistry**

1 torr = 0.001316 atm Do the conversion now. (.001316 atm/ 1 torr) x 832 torr. This cancels the torr unit and gives you the conversion into atm. 832 * .001316 = 1.094912 atm

*November 18, 2010*

**Chemistry**

1 pound per square inch = 0.0680459639 atm (.0608 atm / 1 psi) x 17.4 psi. This cancels the psi unit and gives your answer in atm.

*November 18, 2010*

**Physics**

A bicycle wheel of radius .7m is rolling without slipping on a horizontal surface with an angular speed of 2 rev/s when the cyclist begins to uniformly apply the brakes. The bicycle stops in 5 s. Through how many revolutions did the wheel turn during the 5 s of braking? I ...

*November 18, 2010*

**5 th grade English**

stroll is to walk opposite of enormous can be small or tiny, you choose opposite of release can be throttle or suppress, you choose sorry i do not know the first one

*November 17, 2010*

**8th grade**

24 radical 152 is the same as 48 radical 38

*November 17, 2010*

**british literature**

no

*November 17, 2010*

**Physics**

A 2.60-kg block is attached to a horizontal spring that has a spring constant of 160. N/m. At the instant when the displacement of the spring from its unstrained length is -0.115 m, what is the acceleration a of the object?

*November 16, 2010*

**Calculus **

find the equation of a tangent line of x^(1/4) + y^(1/4) = 4 at the point (16,16)

*November 14, 2010*

**Calculus Tangent lines**

find the equation of a tangent line of x^(1/4) + y^(1/4) = 4 at the point (16,16)

*November 14, 2010*

**Calculus **

What are the antiderivites of x/ (x^2 (squareroot of x^4-1)) and 1/ (1+(x^2/4)) no idea :{

*November 14, 2010*

**U.S. Presidents**

Yeah i was typing that while before you posted a second time btw.

*November 14, 2010*

**U.S. Presidents**

Actually hes not anymore. Nolan Ryan and Chuck Greenberg are now the owners.

*November 14, 2010*

**Physics**

How much work must be done to stop a 970 kg car traveling at 115 km/h?

*November 13, 2010*

**chemistry **

suppose 10 g of sulfur is reacted with 48 g of fluorine gas to make SF6, and after the reaction is complete, the temperature in the flask is 125 C. Find the partial pressure of SF6 in the flask and the mole fraction of SF6 in the 6L flack after the reaction is complete.

*November 10, 2010*

**Physics**

Did you try velocity squared, then multiplied by the density?

*November 10, 2010*

**Chemistry**

A photon has a wavelength of 350 nm. Calculate the energy of the photon in joules

*November 6, 2010*

**Chemistry**

What is the frequency of light having a wavelength of 360 nm?

*November 6, 2010*

**physics**

A rock is dropped from a height of 130.0 meters. With what velocity does it land? How long does it take to fall?

*November 5, 2010*

**Physics**

A flat uniform circular disk (radius = 2.10 m, mass = 1.00 102 kg) is initially stationary. The disk is free to rotate in the horizontal plane about a frictionless axis perpendicular to the center of the disk. A 40.0-kg person, standing 1.00 m from the axis, begins to run on ...

*November 4, 2010*

**Physics**

A race car has a mass of 715 kg. It starts from rest and travels 38.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?

*November 2, 2010*

**3rd grade**

what number is 30 more than 432?

*October 27, 2010*

**math**

Suppose 4 days before the day after tomorrow was Thursday. What day of the week was yesterday?

*October 25, 2010*

**8th grade**

when a truck pulls a trailer the trailer and truck accelerate forward even though the action and reaction forces are the same size but are in oppsoite direction. Why don't these forces balance each other?

*October 25, 2010*

**chem**

what is the pH of a solution that is 0.40 M in sodium acetate and 0.60 M on acetic acid? (Ka for acetic acid is 1.85x10^-5.)

*October 17, 2010*

**Calculus**

Find the equation of the tangent line to the curve (a lemniscate) 2(x^2+y^2)^2 = 25(x^2-y^2) at the point ( -3 , -1 )

*October 15, 2010*

**Algebra**

a rectangle with perimeter of 198 cm is divided into 5 congruent rectangles. What is the perimeter of one of the five congruent rectangles? i got the expression 5w + 4L = 198 the rectangle has two smaller rectangle on the top facing horizontally on the top and three smaller ...

*October 14, 2010*

**math**

.52

*October 12, 2010*

**Psychology**

Dr. Ahmed strongly believes that people are not controlled by their environment, but that everyone has personal strengths and an ability to positively grow. The ______ perspective best summarizes Dr Ahmed’s approach. humanistic psychodynamic cognitive evolutionary i think...

*October 9, 2010*

**stats**

How many students must we sample if we want to be within 4% of the true proportion of female students at DeVry University when using a 95% confidence interval?

*October 7, 2010*

**General Physics**

The 5 kg block in the figure slides down a frictionless curved ramp, starting from rest at a height of h = 3 m. The block then slides d = 12 m on a rough horizontal surface before coming to rest.What is the coefficient of friction between the block and the horizontal surface?

*October 5, 2010*

**7th grade**

Max wants to hang a picture 2 3/4 inches above a desk. His ruler is marked in 1/16ths. Max must use which measurement to hangb the picture? A. 2 1/16inches B. 2 3/16inches C. 2 9/16inches D. 2 12/16inches

*October 5, 2010*

**English 2**

1. b

*October 5, 2010*

**Physics**

I have a very similar problem due on mastering physics in an hour.. I came here to get help but now 30 minutes later I'm actually going to be giving help :). Hopefully it wont be too late depending on your time zone. u= coefficient of static friction force of friction = u*...

*October 3, 2010*

**Physics**

Not gonna tell you the answer directly, but you need to use Trig to find its X & Y velocity. Find the difference between the x axis of the vertex & tramp. Calculate the time according to the horizontal velocity. And take that time multiply it with the gravity

*September 30, 2010*

**english**

is i a noun?

*September 29, 2010*

**physics**

three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r)

*September 25, 2010*

**physics**

three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r)

*September 25, 2010*

**english/ grammar**

what is a concrete noun?

*September 15, 2010*

**geometry**

Find the area of the top of a slice of pizza pie with a diameter of 18 inches cut into 8 slices

*September 14, 2010*

**Geometry**

Find the measure of an angle that is 8 degrees less than 3 times its supplement.

*August 30, 2010*

**mgt330**

A worker in an automobile assembly line who chooses this type of work because of the job security it entails is said to be Intrinsically motivated Experiencing overpayment inequity Experiencing underpayment inequity Extrinsically motivated Self-actualizing

*August 29, 2010*

**MARKETING**

Your company’s sales are 50,000 units. The unit variable cost is $12. Your markup percent on sales is 40% and your fixed costs are $100,000. 1. What is your profit / loss?

*August 29, 2010*

**mgt 330**

General environment – how will the forces be changing over the next three years and how will these forces impact the industry (for example, demographics – aging population)?

*August 28, 2010*

**mgt330**

List at least one reason why you think workers may be more motivated by job security rather than salary and benefits in difficult economic times.

*August 28, 2010*