Tuesday

November 25, 2014

November 25, 2014

Total # Posts: 85

**physics**

During a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 0.144-kg baseball crashing through the pane of a second-floor window in a nearby building. The ball strikes the glass at 14.9 m / s, shatters the glass as it passes through, and leaves the ...
*November 4, 2014*

**physics**

A skier leaves the starting gate at the top of a ski ramp with an initial speed of 4.00 m/s (Figure 6-41). The starting position is 120 m higher than the end of the ramp, which is 3.00 m above the snow. Find the final speed of the skier if he lands 145 m down the 20.0° ...
*October 31, 2014*

**biology**

dont even know where to start You prepared a 10-fold dilution of a culture out to 10-9. You initially estimated there were between 3 x 108 cells/ml and 5 x 109 cells/ml in the original cell suspension. Which tube dilutions would you plate to ensure you captured significant ...
*October 27, 2014*

**biology**

You carried out a 10-fold dilution series. You started with tube 0 which contained an overnight culture of E. coli. You estimated the original culture contained 6 x 108 cell/ml using McFarland nephlemeter standards. You plated 0.1 ml volumes of a number of the dilutions. Which...
*October 27, 2014*

**physics**

'Point charges of 0.26 ìC and 0.79 ìC are placed 0.25 m apart.At what point along the line between them is the electric field zero?'
*September 12, 2014*

**Algebra**

A stock market analyst was investigating the trends of two independent stocks and was surprised to see that both stocks were at the same unit value after a 12 month period. He knew that both stocks had started at the same value but had undergone different trends over the past ...
*August 27, 2014*

**Algebra **

A new tollway is built. For the first month there is no toll to use the road and each day 4800 cars use it. After the first month it is estimated that for each dollar increase in the toll, 800 fewer cars will use the tollway. At what price do you think the company should set ...
*August 27, 2014*

**Algebra**

A tank contains 1200 litres . A tap is turned on and 40 litres of water escape each minute. How much water has escaped in 12 minutes.
*August 27, 2014*

**Math**

When a cue ball strikes another ball, what is the largest possible angle the struck ball can be deflected from the line along which the cue ball was travelling?
*July 22, 2014*

**physics**

a strong 100 kg man pushes down hard on the left piston. What happenes to the 10 kg mass on the right? The answer is the moves down, lifting the left piston despite the strong man. BUT WHY?
*June 15, 2014*

**MATH**

There are 8 boys, 12middle schoolers and 8 girls. what is the ratio of girls to boys?16/12=4:3 divide both sides by 4
*May 21, 2014*

**physics**

A 70 kg man holding a 0 . 857 kg ball stands on a frozen pond next to a wall. He throws the ball at the wall with a speed of 11 . 9 m / s (relative to the ground) and then catches the ball after it rebounds from the wall. How fast is he moving after he catches the ball? Ignore...
*May 7, 2014*

**Chemistry**

The half-life of Th-232 is 1.4E10. Find the number of disintegrations per hour emitted by 1 mol of Th-232.
*April 10, 2014*

**Chemistry **

The half-life of 232Th is 1.4 * 10^10. Find the number of disintegrations per hour emitted by 1 mil of 232Th in 1 min.
*April 10, 2014*

**math**

The grade of a road is 6%. What is its angle of elevation?
*February 20, 2014*

**College algebra**

Allison drove home at 58 mph, but her brother Austin, who left at the same time, could drive at only 40 mph. When Allison arrived, Austin still had 108 miles to go. How far did Allison drive?
*September 13, 2013*

**statistics**

$12,533.65
*April 23, 2013*

**World Geography**

idk
*April 5, 2013*

**ECON**

did you possibly find the answer to this? im stuck on it aswell :)
*February 27, 2013*

**geometry**

what is the perimeter of a pool 7ft wide 10ft long 4ft high? Is it 34ft squared?
*February 26, 2013*

**algebra**

an investor invested a total of $2100 in two mutal funds. one fund earned a 9% profit while the other earned a 7% profit.if the total profit was $161 how much was invested in each fund
*January 13, 2013*

**maths**

kathleen spent 5/8 of her money and had 15e left how much had she at the start
*November 27, 2012*

**physics**

A person with a density of 980 kg/m3 floats in seawater of density 1025 kg/m3. What fraction of the person is submerged?
*November 26, 2012*

**CHEM EQB**

How many ml of 0.2M NaH2PO4 should b added to 40 mL of 0.1M Na3PO4 to make the buffer pH 7.2. Ka1:1.1 x 10^-2 Ka2:7.5 x 10^-8 Ka3:4.8 x 10^-13
*November 6, 2012*

**7th grade math**

I plan to...thanks again!
*September 4, 2012*

**7th grade math**

That's the same answer my daughter got on her test & the same one I came up with when going over her missed problems...I just wanted another person's input. Thank you!
*September 4, 2012*

**7th grade math**

-6(2r-4)
*September 4, 2012*

**nervous system**

yea wat is it
*August 26, 2012*

**Health**

wrong
*August 3, 2012*

**Statistics**

suppose the correla tion between SAT Verbal scores and Math scores is .57 and that these scares are normally distributed. IF a student's Verbal score places her at the 90th percentile, at what percentile would you expect her Math scores to be?
*December 20, 2011*

**math**

Good solution, Steve, but w+b+f=6+7+4=17. worms (w) - 6 bugs (b) - 7 butterflies (f)- 4 critters: w+b+f=22 points: 6w+7b+4f=119 (the only way to get an odd number is if b is odd) points from having one of each of the critters: w+b+f -> 6+7+4=17 so, using the points now: 6w+...
*November 7, 2011*

**MATH PLEASE HELP**

Given: Let f: X -> Y be a function. Then we have an associated function f^(-1): P(Y) -> P(X), where f^(-1) (B)⊂X is the inverse image of B⊂Y. Question: Show that f^(-1) is one-to-one if and only if f is onto. [Notes: ⊂ represents subspace, I just ...
*November 3, 2011*

**Math: Intro to Proofs**

Given: Let f: X -> Y be a function. Then we have an associated function f^(-1): P(Y) -> P(X), where f^(-1) (B)⊂X is the inverse image of B⊂Y. Question: Show that f^(-1) is one-to-one if and only if f is onto. [Notes: ⊂ represents subspace, I just couldn...
*November 3, 2011*

**medical terminology**

1. Dr. Hannah places a stethoscope to a seven-year-old child’s chest. The lungs reveal basilar rales. Which method is Dr. Hannah using to perform the physical examination? A. Auscultation C. Percussion B. Palpation D. Visualization Answer. A 2. Cardiology is the study of ...
*March 11, 2011*

**medical terminology**

1. Dr. Hannah places a stethoscope to a seven-year-old child’s chest. The lungs reveal basilar rales. Which method is Dr. Hannah using to perform the physical examination? A. Auscultation C. Percussion B. Palpation D. Visualization 2. Cardiology is the study of the heart...
*March 11, 2011*

**physics**

In a lab experiment, a 1.5-kg cart traveling at 4.3 m/s in the +x direction collides with a 2.5-kg cart traveling at 2.7 m/s in the -x direction. After the collision, you find that the 2.5-kg cart is traveling at 1.9 m/s in the +x direction. How fast and in what direction is ...
*March 8, 2011*

**calculus**

please help. Compute Δy and dy for x = 4 and dx = Δx = -0.2. (Round the answers to three decimal places.) y = 4x - x2....im lost to were to start solving for delta y
*February 26, 2011*

**calculus**

please help i am lost at what is dy/dx and what is dy/dt. A trough is 10ft long and its ends have the shape of isosceles triangles that are 3 ft across at the top and have a height of 1ft. If the trough is being filled with water at a rate of 12ft^3/min, how fast is the water ...
*February 25, 2011*

**physics**

The velocity of a 2.5 kg block sliding down a frictionless inclined plane is found to be 1.58 m/s. 1.40 s later, it has a velocity of 7.32 m/s. What is the angle of the plane with respect to the horizontal (in degrees)?
*February 24, 2011*

**physics**

A mass m = 0.225 kg on a frictionless table is attached to a hanging mass M = 0.330 kg by a cord through a hole in the table (see the figure). Find the speed with which m must move in order for M to stay at rest if r = 27 cm.
*February 24, 2011*

**calculus**

Please help. i am confused on how to do this one. I keep getting arcsin(square root -cos9x) but it is wrong. The probem is F(x)= arcsin(sqtsin(9x))
*February 11, 2011*

**calculus**

find the derivative of e^8e^x *8e^x
*February 7, 2011*

**calculus**

PLEASE HELP Find the first and second derivatives of the function. y = e^8ex. I keep getting y' = e^8ex * 8 and its wrong. how do you do this?
*February 6, 2011*

**chemistry**

what type of interaction is Mg2+, O2- What type of interaction is Na+, Cl- What type of interaction is I-I What type of interaction is H2CO, and CO What type of interaction is SO2, C6 H14
*February 3, 2011*

**calculus**

please help! Find an equation of the tangent line to the curve at the point (-1, 1). y = 5x3 - 6x. y=? ...............i keep getting y=x+2 and its wrong. can someone please help?
*January 25, 2011*

**Science**

as a substance melts, it changes from solid to liquid and heat is absorbed
*January 9, 2011*

**Chemistry**

water boils at 100 degrees celsius water freezes at 0 degrees celsius 1 K = 273 degrees celcius all you have to do is calculate the K value for 0 celcius and the K value for 100 degrees celcius and subtract to find the difference :)
*January 9, 2011*

**chemistry reaction rate**

add more NO so that the equation will equilibrate by producing more NO2
*January 9, 2011*

**calculus**

Jill likes to play Blackjack. She heard about a winning strategy to ensure she does not lose. The strategy is: choose a starting amount to bet, and then double your bet if you lose. Keep doubling your bet until you win. When you win a hand, go back to the starting bet. Hoping ...
*November 30, 2010*

**physics**

A 33 N force acting at 90° and a 44 N force at 60° are applied concurrently at a point P. What is the magnitude and direction of the resultant force?
*November 18, 2010*

**economics**

what are the theories of david mcclelland?
*November 13, 2010*

**algebra**

what is the equation of a hyperbola with one vertex at (6,5) and the equation of asymptotes are 5x-6y-30 and 5x+6y-30?
*November 7, 2010*

**math**

what is the equation of a hyperbola with one vertex at (6,5) and the equation of asymptotes are 5x-6y-30 and 5x+6y-30?
*November 7, 2010*

**architecture**

can you give me some websites for architectural designs for a 2 bedrooms bungalow?
*November 7, 2010*

**Physics**

a. 490 j
*November 7, 2010*

**math**

what is the equation of a hyperbola with one vertex at (6,5) and the equation of asymptotes are 5x-6y-30 and 5x+6y-30?
*November 7, 2010*

**math**

what is the equation of a hyperbola with one vertex at (6,5) and the equation of asymptotes are 5x-6y-30 and 5x+6y-30?
*November 7, 2010*

**algebra**

I need to write an equation for the following: Denise's cell phone plan is $29.95 per month plus $.10 per minute for each minute over 300 minutes of call time. Denise's cell phone bill is $99.95. For how many minutes was she billed?
*October 21, 2010*

**chemistry**

How many moles of O2 are needed to react with 2.90 moles C2H2
*October 16, 2010*

**calculus**

Choice 1: Payments of $ 2600 now, $3000 a year from now, and $3450 two years from now. Choice 2: Three yearly payments of $ 3000 starting now. Interest is compounded continuously. (a) If the interest rate on savings were 4.76 %,which would you prefer? (b) What is the interest ...
*September 16, 2010*

**chemistry**

2Na + S --> Na2S 20g Na x (1 mole Na)/(23g Na) = 0.87 mol Na 0.87 mole Na x (1 mol Na2S)/(2 mol Na) x (55.1g Na2S)/(1 mol Na2S) =23.97g Na2S
*April 20, 2010*

**Math 10th grade**

five marbles in a jar are green. the odds against choosing a green marble are "4:1" how many marbles are in the jar
*March 11, 2010*

**science**

what is the independen variable and the dependent variable for scientific method to how does air pressure in a tire save gas
*September 29, 2009*

**Microeconomics**

excess milk supply
*September 9, 2009*

**Algebra 2**

Solve by completing the square: x^2+9x+6=0
*November 4, 2008*

**math**

if you simplify its 1:8.5
*November 4, 2008*

**Math gr 8**

I'm not sure how to solve this into a ratio, but a way you could find the average speed, would go like this. First, you'd change minutes into seconds, since you are dealing with meters. then divide. How many meters per second did each person run?
*November 4, 2008*

**Math gr 8**

Well, first things first. Do you know which formula you'll be using for this?
*November 4, 2008*

**math**

So what if you were factofing 2x^2-x-35=0?
*November 4, 2008*

**math**

So is that the same way you'd do 3x^2+9x-12=0?
*November 4, 2008*

**math**

i need to solve this equation by completing the square: x^2-14x+1=0 i don't' know how to do this, nor do i know what complete the square means. please help.
*November 4, 2008*

**college**

why did the united states annex the philippines
*September 27, 2008*

**alabama state**

America's continued demographic trend toward urbanization would eventually result in the majority of the population living in cities, which finally did occur by the time of which U.S. Census reporting period?
*September 8, 2008*

**sose**

why did the people who lived in the colonies prior to 1901 feel that they needed to join together to make one country?
*May 6, 2008*

**music**

i don't think is that group, there are about 4-5 people singing that song. I just remember the title have the word sometimes or somewhere, the title is about 4-5 words long. Maybe its not a group, it might be a crossover or something, having a japanese and some caucasians.
*April 26, 2008*

**music**

Hi, I am looking for an old english song, but I don't remember the song title, its a slow love song and the only thing i remember is that the singers are all male and there are more than one, some asian looking probably japanese and also caucasians. The title might be have...
*April 26, 2008*

**PHYSICS!!**

Comet Halley returns every 74 years. Find the average distance of the comet from the sun. How do i do this??
*January 16, 2008*

**math**

I think the answer to my first problem is 15 for the total bill but I am just guessing. I need to explain the answer.
*November 26, 2007*

**math**

I am only in 5th grade and not using x yet. This is part of parts and whole fractions.
*November 26, 2007*

**math**

is this the right answer: My friend paid 9 dollars and the total bill is 15? Could you also tell me if the answer to the following is 16? If 12 counters are 3/4 of a set, what is the whole set?
*November 26, 2007*

**math**

I need this by tomorrow morning I had $6 to pay for part of lunch. My friend had enough money to pay the other part or 3/5 of the bill. What is the total bill?
*November 26, 2007*

**Early Child Ed.**

I say the answer is A. I am Nic's mom and both of my children have been in classes where special needs children were mainstreamed with nonspecial needs children and the teachers always removed the disruptive child.
*November 26, 2007*

**Algebra**

I'm having a problem solving the following example. The teacher wants it in this format. 1st the Verbal Model, 2nd the Labels 3rd Algebraic Model 4th- Solve and finally 5th part: Answer Question. Example: You are working on a scouting badge. You need 60 points on 4 ...
*October 11, 2007*

**help**

how do u cite the newspaper the couier journal http://owl.english.purdue.edu/owl/resource/557/08/ Here is a website that gives you specific instructions and examples for the resource you need to cite. In the future, it would help if you put the SUBJECT in the Subject line -- ...
*February 11, 2007*

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