Tuesday

May 3, 2016
Total # Posts: 811

**Physics**

well, I know a.) is 39.2 J using the equation for elastic potential energy (Delta U = 1/2kx^2). But I am having trouble figuring out b and c and don't know what equations to use.
*October 31, 2010*

**Physics**

A block with mass m = 2.00kg is placed against a spring on a frictionless incline with angle (30 degrees). (The block is not attached to the spring.) The spring with spring constant k = 19.6 N/cm, is compressed 20.0 cm and then released. a.) What is the elastic potential ...
*October 31, 2010*

**College Physics**

A block with mass m = 2.00kg is placed against a spring on a frictionless incline with angle (30 degrees). (The block is not attached to the spring.) The spring with spring constant k = 19.6 N/cm, is compressed 20.0 cm and then released. a.) What is the elastic potential ...
*October 31, 2010*

**Math**

A roofing crew can roof a house in 10 hours. If a second crew was added, the job would take 6 hours. How long would it take the second crew to roof the house alone?
*October 20, 2010*

**physics**

An unbanked curve has a radius of curvature of 75m. On a winter day, with snow on the road, the coefficient of static friction between the tires of the car and the road is .23. What is the maximum speed with which the car can safely negotiate the curve?
*October 17, 2010*

**physics**

An unbanked curve has a radius of curvature of 75m. On a winter day, with snow on the road, the coefficient of static friction between the tires of the car and the road is .23. What is the maximum speed with which the car can safely negotiate the curve?"
*October 17, 2010*

**math**

I have 6 tens and less than 5 ones. What number am I?
*October 12, 2010*

**Stats**

There are four major political parties in the country Treon. A public research group is interested in finding out whether there is any relationship between the party that is supported by a citizen of Treon and that citizen's socio-economic status. For the purposes of a ...
*October 9, 2010*

**Stats**

a) IHI insurance is interested in determining whether younger drivers (below the age of 25) are more prone to motor accidents than older drivers (25 or older). A random sample of 70 IHI policyholders below the age of 25 were selected and whether they had been in less than 2 (...
*October 9, 2010*

**Accounting**

What would you pay for a $50,000 debenture bond that matures in 15 years and pays $5,000 a year in interest if you wanted to earn a yield of: (Round computations to 2 decimal places and use the rounded amounts to calculate the final answer. Round the final answer to 2 decimal ...
*September 29, 2010*

**math**

Using the formula of Interest equals principle times interest rate times term or I + P x R x T. Since we do not know the interest rate, using algebra, we get this formula to find out the interest rate: R + I/ P x T. So in your case it would be this: R = $420.00 / $3,500.00 x 1...
*September 23, 2010*

**Calculus**

Evaluate the integral e^x sin4x dx. I know the answer is 1/17 e^x sin4x - 4/17 e^x cos4x + C but I don't know how to solve it out.
*September 23, 2010*

**algebra**

how do I write7,375 in expanded form using power of 10 and exponenets
*September 16, 2010*

**College Physics**

Thanks a bunch!
*September 9, 2010*

**College Physics**

A red car and a green car, identical except for color, move toward each other in adjacent lanes and parallel to an x-axis. At time t=0, the red car is at x sub r = 0 and the green car is at x sub g = 220m. If the red car has a constant velocity of 20km/h, the cars pass each ...
*September 9, 2010*

**Weather & Climate (science)**

all are true
*September 8, 2010*

**Weather & Climate (science)**

1.) I am guessing an aneroid barometer 2.) mercury barometer
*September 8, 2010*

**Weather & Climate (science)**

Sure, what other questions do you have?
*September 8, 2010*

**Weather & Climate (science)**

Barometer
*September 8, 2010*

**Physics**

A red car and a green car, identical except for color, move toward each other in adjacent lanes and parallel to an x-axis. At time t=0, the red car is at x sub r = 0 and the green car is at x sub g = 220m. If the red car has a constant velocity of 20km/h, the cars pass each ...
*September 8, 2010*

**physics**

I have 2 questions: Assuming that water has a density of exactly 1 g/cm3, find the mass of one cubic meter of water in kilograms. Suppose that it takes 10.0 h to drain a container of 5700m3 of water. What is the "mass flow rate," in kilograms per second, of water ...
*September 2, 2010*

**statistics**

I do very much appreciate your help. This guides me to where I need to go.
*August 9, 2010*

**statistics**

Given a sample size of 38, with sample mean 660.3 and sample standard deviation 95.9 we are to perform the following hypothesis test. Null Hypothesis H0: ƒÊ = 700 Alternative Hypothesis H0: ƒÊ ‚ 700 At significance level 0.05 3. Calculate the ...
*August 9, 2010*

**Calc**

Solve the following separable equation. y'=(4x^3-1)/y for y(1)= -3
*July 11, 2010*

**Calc 2**

Solve the following separable equation y'=e^2x/4y^3
*July 9, 2010*

**Calc 2**

Solve the Separable equation y=((sqrt(1-y^2)) x^2
*July 9, 2010*

**Calc 2**

Differential equations. There are gophers in a very large vacant lot. The original population is 30 Gophers. After 2 months there are 38. When will there be 45 gophers? round answer to nearest tenth of a month
*July 9, 2010*

**Calc 2 college**

Thanks
*July 9, 2010*

**Calc II**

x^3/(sqrt x^2+25) dx
*June 26, 2010*

**Calc II**

Integrate 3/(Sqrt x^2-16) dx
*June 26, 2010*

**Calc II**

Find the area of the region between y = x sin x and y = x for 0 ≤ x ≤ pi divided by 2
*June 25, 2010*

**Calculus II**

Find the area of the region between y = x sin x and y = x for 0 ≤ x ≤ pi/2
*June 25, 2010*

**Science**

A 44 g piece of ice at 0 degrees celsius is added to a sample of water at 7 degrees celsius. all of the ice melts and the temperature of the water decreases to 0 degrees celsius. How many grams of water were in the sample?
*June 18, 2010*

**algebra**

Ok, so i did the problem right, but just was not sure what to do with them. sorry for the confusion...thanks for the help!
*June 3, 2010*

**algebra**

because if I use what you gave me would it be (x-3)(x+1) and then what would i do?
*June 3, 2010*

**algebra**

Ok I think I am even more confused: its 3 feet^2 So is it x^2-2x-9=0
*June 3, 2010*

**algebra**

The width of a rectangle is 2 feet less that the length. The area is 3 feet^2. Find the length and width.
*June 3, 2010*

**Math**

(1+ square root of 5)(square root of 3-square root of 5)
*May 5, 2010*

**Math**

(1+ square root of 5)(square root of 3-square root of 5)
*May 5, 2010*

**Math**

2 square root 3(square root of 7- square root of 3)
*May 5, 2010*

**Math-Reiny**

I posted this problem earlier and you answered it for me. The teacher said the correct answer is 3+2y/7-4y. How is that the answer. Below is what you did earlier 3/(y+2) / (7/y-4)) = 3/(y+2) * (y-4)/7 = (3y-12)/(7y+14) or 3(y-4)/[7(y+2)]
*May 3, 2010*

**Math **

3/y+2 over 7/y-4 can u please show me the steps on how you got the answer. Thank You
*May 3, 2010*

**Math**

3/y+2 over 7/y-4 can u please show me the steps on how you got the answer. Thank You
*May 2, 2010*

**math**

Michelle draws a card from a standard deck of 52 cards. She replaces the card and draws a second card. What is the probability that she draws a Heart and then a Spade?
*April 28, 2010*

**Math**

120 Are the last two digits divisible by 4 Are the last three digits divisble by 8 Are the sum of the digits divisible by 9 1048 Are the last three digits divisible by 8
*April 15, 2010*

**Math**

120 Are the last two digits divisible by 4 Are the last three digits divisble by 8 Are the sum of the digits divisible by 9 1048 Are the last three digits divisible by 8
*April 15, 2010*

**math**

Use factoring to solve the equation. (x+6)(x+5)=2
*April 14, 2010*

**Math**

Use factoring to solve each equation. (x+6)(x+5)=2
*April 14, 2010*

**math**

Find the ordered pair using the elimination method. 4x+5y=3 8x+10y=6
*March 21, 2010*

**Algebra**

Well This is what I did to get 40^.5 you know the amount Y and then you already know the function X its Y^x. that's what I just went over today in class
*March 10, 2010*

**Algebra**

wouldn't it just be 40^1/2 that's 6.32 so 6 rounds
*March 10, 2010*

**Math**

Block A & B slide on lubricated surfaces for which friction is .1. knowing that the system is released from rest, determine the velocity of block B after 5 seconds block A is 10 N block B 20N and block B is on a 30 degree incline connected to a at top of the surface
*March 10, 2010*

**physics 101**

A 72.9 kg man is standing on a frictionless ice surface when he throws a 1.6 kg book at 11 m/s.
*March 9, 2010*

**Maath**

Use the elimination method to solve each system. How do you do this? {u+4y=11 7u+3v=2
*February 26, 2010*

**Chemistry **

Select all cases in which the attraction between units in the solid can best be classified as electrostatic bonding forces. CsBrO3 N2O3 Cr(OH)2 Ca3(AsO4)2 Rn Ar None
*February 19, 2010*

**4th grade**

You need 1/2 cup of sugar to make a three-layer cake. How much sugar would you need for a one-layer cake
*February 11, 2010*

**Trig**

Thanks a lot. I also thought the question was written improperly but I spent a lot of time trying to simplify the darn thing! Thanks for your help.
*February 9, 2010*

**Trig**

How do I simplify this? cos4xcos3x-sin4xcos3x I pulled the cos3x out as a common factor but that doesn't really help. Can someone please direct me on this. Thanks!
*February 9, 2010*

**Math-Definition**

Why must we find a common denominator when add/subtract fractions?
*February 4, 2010*

**Math-definition**

What is the prime factorization of a number?
*February 4, 2010*

**college chem**

This has been very helpful!!!!
*January 25, 2010*

**Calculus**

Suppose f(x)=2x^2-x^3 and g(x)= sin(pix/2). a) What is the exact value of the integration from 0 to 2[f(x)-g(x). Find numerical approximation of this value. What does the value of this integral tell you about the areas of the regions beteen the two graph
*January 21, 2010*

**calculus**

To find the answer for b) though, do you have to find the area of the smaller rectangular portion within the region R, and then find the halves of the remaining area of the region? But then how would you work that out to find what b equals? I am confused.
*January 21, 2010*

**Math Business**

This is all the info I got in the question and is probably why I don't really understand what to do with it. Thanks anyway!
*January 19, 2010*

**Math Business**

Janet got 671.50 in cash as the proceeds form a loan of $680. The discount rate was 10% simple interest. Find the discount period. I got 118.5 months but am not sure if I did it correctly.
*January 19, 2010*

**math**

Find an approximation for ã11 rounded to the nearest thousandth.
*January 19, 2010*

**Algebra**

A LARGE PIZZA COSTS $8.95,PLUS 0.65 FOR EACH ADDITIONAL TOPPING.REMI PAID $10.90 FOR A LARGE PIZZA.HOW MAY ADDITIONAL TOPPING DID HE GET?
*December 2, 2009*

**8th grade**

I know the answer but how do i get my starting line ? Vancover recivers 3 times the amount of snow as toyko does together they recive 80 cm i can see that vancover will be 60 cm and toyko 20 cm but i do not know how to do it weird eh ?
*December 1, 2009*

**economics**

In an article about the financial problems of USE Today, Newsweek reported that the paper was losing about $20 million a year. A Wall Street analyst said that the paper should raise its price from 50 cents to 75 cents, which he estimated would bring in an additional $65 ...
*November 20, 2009*

**Physics**

A crate on a floor has an applied force 15 degrees below horizontal of 952N The crate moves with constant velocity. The coefficient of kinetic friction is 0.15. What is the mass of the crate ?
*November 17, 2009*

**Physics**

A car on a roller coaster has a mass of 9528 kg. The car is dragged up the main hill at an angle of 38 degrees ( above horizontal) for a distance of 182 m to the top of the first hill. What work was done to the car ?
*November 17, 2009*

**Physics**

Two people push on a crate. Person 1 pushes in the positive X direction with a force of 25N. The second person pushes in the negative X direction at an angle of 15 degrees below the horizontal with a magnitude of 18.5N the box moves with uniform velocity. What is the force of ...
*November 17, 2009*

**math**

How do yo do Arrays and Expanded Algorithum Ex 23 x17 _ _ _ _ _ _ _ _ _ _ _______ _ _ _
*November 14, 2009*

**economics**

give examples of normal and inferior goods---> what are the similarities and the differences between the 2 groups?
*November 12, 2009*

**world history**

What event led to Great Britain's renewed interest in Egypt in the late 1800s?
*October 22, 2009*

**physics**

a tennis ball is dropped from 1.30 meters above the ground. it rebounds to a height of 1.00 meters. How do I find with what velocity does the ball hit the ground. With what velocity does it leave the ground, and if the tennis ball were in contact with the ground for 0.01 ...
*October 14, 2009*

**Chemistry 151**

How much oxygen is required to completely react with 10 g of C4H10?
*September 28, 2009*

**german**

Hallo. Mein Deutsch ist nicht so gut. Es gibt Fehler in diesem Absatz? Bitte, hilf mir das beseitigen: Heute ist es ein idealer Tag zu einem Naturausflug im Wald machen. Das Wetter ist sehr schön und angenehm. Der Himmel ist wolkenlos. Wir wandern unter den großen ...
*September 22, 2009*

**math algebre2 and trig**

5>4b+9>17 - -
*September 9, 2009*

**Math (Angle Calculation)**

m LB = 7xo + 11o LB = 90 o
*September 7, 2009*

**Math (Angle Calculation)**

m LA = 6xo LA = 180 o
*September 7, 2009*

**Math (Angle Calculation)**

m LA = 6xo LA =
*September 7, 2009*

**Math**

Use the substitution method to find solution sets (x,y) for the following systems of equations: 3x-5y=-11 6x+2y=26
*June 20, 2009*

**english**

on an exam if you are given an essay to read & then deconstruct.....how do you do this Thanks
*June 20, 2009*

**Maths**

How do i show that (a-b)^2(a+b)+ab(a+b)=a^3+b^3 I have come up with the last part ab(a+b)=a^2+b^2, but how do i work out the 1st part??
*June 19, 2009*

**Biology**

Q1. What enzyme could you use to break down the major chemical in the cell wall? A: EDTA but it's not an enzyme Q2. What chemical would you use to break down the major chemical in the cell membrane? A: something like lipases? Please help!!
*June 19, 2009*

**jane**

The answer is zero because the angle between the two vectors is 90. Cos(90)= 0
*June 2, 2009*

**math**

help
*April 16, 2009*

**EXTRA CREDIT**

help
*April 10, 2009*

**math**

your money = $28 + ($18.25 * each week) the $28 is money that you already have in your bank account, and $18.25 how much it will increase by each week. friend's money = $161 - ($15 * each week) the $161 is money your friend has in his bank account, and $15 is how much it ...
*April 2, 2009*

**Organic Chemistry**

Q: Each of the solvent given should effectively separate one of the following mixtures by thin-layer chromatography. Match the appropriate solvent with the mixture that you would expect to separate well with that solvent. Select your solvent from the following. Hexane, ...
*March 7, 2009*

**Organic Chem**

Q: Each of the solvent given should effectively separate one of the following mixtures by thin-layer chromatography. Match the appropriate solvent with the mixture that you would expect to separate well with that solvent. Select your solvent from the following. Hexane, ...
*March 7, 2009*

**Organic Chemistry**

thank you so much Dr. Russ...yes the question assumes the containment comprises only a small percentage of the mixture... p.s.: do u happen to know the answer to my other question as well? under the same assumptions...
*March 2, 2009*

**Organic Chemistry**

How would you purify Fluorene contaminated with ethyl-4-aminobenzoate? What method and solvent you would use? Please help...
*March 2, 2009*

**Organic Chemistry**

I really need help on this question...please help...
*March 1, 2009*

**Organic Chemistry**

How would you purify biphenyl contaminated with fluorene? What method and solvent would you use?
*March 1, 2009*

**armore christian**

what type of note is written by vacationers
*February 3, 2009*

**2nd grade math requestion post**

My child is doing the same worksheet and I have no idea. What does "it has two ones" mean?
*January 20, 2009*

**Biochemistry**

How can I separate glucose and a triacylglycreol mixture? Thanks for any help ,,,,
*December 1, 2008*