Sunday

April 20, 2014

April 20, 2014

Total # Posts: 855

**Physics 1**

What torque is needed to accelerate a 70Kg disk with a 20 cm radius from rest to 10 rad/s?

**Physics 1**

What is the rotational kinetic energy of the Earth in its orbit around the sun?

**Math**

The GoodMentalHealth Insurance Company has determined the number of new clients a psychologist gets per month and their respective probabilities, as shown in the table below: Number of New Clients Probability 0 0.05 1 0.10 2 0.15 3 0.35 4 0.20 5 0.10 6 0.05 The probability of ...

**statistics**

Professor Smith gave a final exam in her history class. The scores on the final exam are normally distributed with a mean of 75 and a standard deviation of 6. If Professor Smith wishes to give A’s to the top 4%, what would be the cutoff score be for A’s? a. 90.0 b. 8...

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...

**statistics**

Ashley and Sanjay are donating blood at a local hospital. As a standard practice, the blood is screened for anemia (low levels of red blood cells), and the results are given to each donor as a z score, ranging from negative scores (low amounts of red blood cells, anemic) to po...

**albebra**

In mathematics, we commonly use the following formula for perimeter of a rectangle: P = 2L + 2W so 54=2(6)+2(x) 54=12+2(21) W=21cm Usually the length is longer than the width. Double check your answer and problem

**statistics**

Leslie took two midterm exams and earned the following scores: 82 on the chemistry exam (class distribution: μ = 75, σ = 6.25) and 63 on the physics exam (class distribution: μ = 59, σ = 3.57). Rounding to two decimal points, on which exam should Leslie get...

**science**

The Hertzsprung-Russell Diagram is a graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperature and evolutionary stage. So the answer is D

**math**

Gopal spent three fifths of his money in the first week and one third of the remainder in the secondweek.He spent $110 altogether.How much money did he have left?

**Science**

Explain how gravitational, electrical, and magnetic forces act on a maglev train?

**math**

you are correct :)

**AP CHEM**

is there some rule on weak and strong electrolytes and the amount of concentration requiered for each? for example are weak electrolytes supposed to have low concentrations and vice versa for strong electrolytes? if so cna you please explain why as well? Thank you so much! :)

**Science**

Describe how the structure of DNA is correlated with its role as the molecular basis of inheritance in Biology.

**Math **

A stone was thrown from the top of a cliff. The height, H meters, of the stone above sea level t seconds after it was released is given by H=-5t+20t+60. a)How high is the cliff? What makes you say this? b) How high is the stone after two seconds? c) What is the maximum height?...

**math**

The answer in the book is 100. I can't come up with that solution.

**math**

200 people attended a party. Ninety-nine percent of the people were FSU fans. After some people left the party, 98% of the people left were FSU fans. How many people left the party?

**Physics**

I don't understand the negative. Would it be wrong if I put the negative answer if they're asking how long it takes the sand bag to hit the ground?

**Physics**

A sand bag is dropped out of a balloon traveling upward at speed of 2.3m/s. A kiddo drops a bag at the instant the balloon is 34m above the ground. How long does it take the sand bag to hit the ground? I got -2.41s why?

**Physics**

Landing with a speed of 90 m/s In the x direction a jet come to rest at 1 km. assuming the jet slows down with constant acceleration find the magnitude of it's acceleration. Is there anyway someone could break this down step by step??

**math**

Find the centre of the circle that passes through the points p(-9,5), q(1,5), and r(-2,-2)

**Plz help :(**

1. 2:3 6. 0.35 10. Can u plz help me with this one? Here are the choices for #4 4/27 2/13 13/2 52/8

**Plz help :(**

My answers: 1. 3:4 2. x = 2 3. 9 4.? 5. 5.6 6. 0.35 9.? 10. my guess, 62?

**Plz help :(**

Thanks....

**Plz help :(**

1. Write the ratio in the simplest form. 16:24 (1 point) 1:2 4:3 3:4 2:3 2. Solve the following proportion. x over three equals six over nine (1 point) 18 27 2 24 3. A recipe calls for 3 cups of flour to make 3 dozen cookies. Use the proportion to calculate how much flour is n...

**Math help plz check my answers!**

1. Write the ratio in the simplest form. 50:10 25:5 10:2 5:1 1:5 2. Solve the following proportion. r/5= 9/21 r = 9 r = 2.14 r = 11.66 r = 37.8 3. A recipe calls for 3 cups of flour to make 3 dozen cookies. Use the proportion to calculate how much flour is needed to make 9 doz...

**Math**

Expand and simplify For + 5(a+8)= And for - 7(3d-6)

**accounting**

Exercise 5-3 Analyzing and recording merchandise transactions-both buyer and seller LO P1, P2 Santa Fe Company purchased merchandise for resale from Mesa Company with an invoice price of $16,000 and credit terms of 3/10, n/60. The merchandise had cost Mesa $10,912. Santa Fe pa...

**Calculus**

For R"(x) = -15[(x-1)(e^-x)-(e^-x)] with 0 < x < 7 What interval is the graph concave and and concave down? I know concave up is (0,2). Is that right? Does concave down exist?

**Economics**

Is it true that the underlying trend of growth in the economy is determined by the growth in the number of workers, the growth in the savings and investment rate, and the growth in productivity ?

**math**

Find the equation of the line that has the given slope and passes through the given point: m = -3, (6,6)

**basic english**

Complete the following sentence with a word or words that show a logical relationship. Joshua took a nap _____ sorting the mail.

**Economics**

Could you please elaborate on Cap and Trade? How could we use it for companies to limit their air pollutants?

**Computer Science**

The array represents a map with coins, and the integers represent a row and column location of a coin gatherer. The gatherer is greedy and lazy when deciding to which adjacent location (either up, down, left, right) to move next. It’s greedy because it moves to the locati...

**psychology**

how do various behaviors of social dominance and coutship display affect the evolutionary process

**math**

Who discovered the Worlds Smallest Glacier?

**algebra 2**

Who discovered the Worlds Smallest Glacier?

**Animal Physiology HELP!!!!!!!!!!**

Please help me!!! What are the answers to these Animal Physiology questions? Urgent..... A decrease in the partial pressure of carbon dioxide in the lungs is referred to as a) Respiratory acidosis b) Hypercarbonia c) Hyperoxia d) Hypercapnia ___________________________________...

**science**

10% of the atmosphere is located above the altitude where the pressure is a. 100 b. 900

**Math**

tan-1(tan(3pi/5))

**English 10**

Add punctuation to the following excerpt. Irving continues in those days, the heart of lover could not contain more than one lady at a time a modern gallant has often room enough to accommodate half a dozen either the hearts of the gentleman have grown larger, or the persons o...

**Introduction to human services**

What have been the most significant changes in human services over the past 50 years

**Art**

yea i have bats, oh ok thnx

**Art**

i have to make a cave for art but i need ideas what to put in it. There's four rooms in the cave, i have bones,skeleton,stalagmites,stalactites,webs what eles?

**Finance**

You are considering buying 100 shares of TEXAS INC common stock. The common stock is expected to pay a dividend of $2.50 a year from today; the growth rate of the dividends is 8% for two years, then level off to a constant rate of 5% per year. The correlation between TEXAS Inc...

**Spanish**

Tu amigo insiste en preguntarte de quiénes son las cosas. Tú le contestas de forma muy enfática. 1.¿De quién es este sombrero? / tú 2.¿De quiénes son estos cinturones? / Tomás y Ricardo 3.¿De quiénes ...

**chem ! help!**

.A balloon is filled with 14 L of gas at 302 K. What is its temperature in Kelvin when the volume expands to 20 L? Round to the nearest whole number. Don't forget the units. my teacher explained it but im still lost please help

**algebra**

please help Solve for h in U= mgh. Please show steps.

**algebra**

find the LCM of 15ef and 12e^4 (12e to the power of 4) Please show the steps. I do not understand how to do this.

**Chemistry**

Oh and the Ksp values for AgCl and PbCl2 is 1.8x10^-10 and 1.7x10^-5, respectively.

**Chemistry**

A solution contains 0.022 M Ag and 0.033 M Pb2 . If you add Cl–, AgCl and PbCl2 will begin to precipitate. What is the concentration of Cl– required, in molarity, when A. AgCl precipitation begins? B. AgCl precipitation is 99.99% complete? C. PbCl2 precipitation begi...

**math**

find the verticle, horizontal, and oblique asymptotes, if any, for the given rational function: g(x)=x^4-81/3x^2-9x I feel like such a dork becaue i have no clue how to do this, can someone please help me????

**calculus**

3). The shaded region is bounded by the y-axis and the graphs of y=1+√x, y=2. Find the volume of the solid obtained by rotating this region around the x-axis. Answer choices: 7/6pi, 4/3pi, 11/6pi, 5/3pi, 13/6pi, 5/6pi 4). Find the area of the region bounded by y=x^2-6x+7...

**calculus**

5). Find the volume of the solid of revolution generated by rotating the graph of y=8 lnx about the y-axis between y=0 and y=16 Answer choices: 238.39pi, 246.39pi, 230.39pi, 214.39pi, 222.39pi 7). Find the area of the region bounded by y=√x-2, y=9, y=0, x=0

**calculus**

10). Find the area of the region bounded by the graph of f(x)=4lnx/x, y=0, x=5.8 11). Find the area of the region bounded by x=y^2-1y, x=0

**calculus**

8). Part 1 of 2: In the solid the base is a circle x^2+y^2=16 and the cross-section perpendicular to the y-axis is a square. Set up a definite integral expressing the volume of the solid. Answer choices: integral from -4 to 4 of 4(16-y^2)dy, integral from -4 to 4 of (16+y^2)dy...

**Math**

Null factor law and factoriising: 2x^2+7x=0 X(2x+7)=0 X=0 or 2x+7=0. ( the answer in the book was x=-7/2, how? And. X^2-4=2x-4 Is it x^2-4-2x+4=o ??? If so!' how do I continue?

**pre calculus**

Given the following polynomial; f(x)=(x-2)^3 Find: a. the zeros and the multiplicity of each b. where the graph crosses or touches the x-axis c. number of turning points d. end behavior I have no clue what I am doing. pleeeaaase help!!!

**ecology**

Ten breeding pairs of rabbits are introduced onto an island having no natural predators and a good supply of water and food. What will most likely happen to the rabbit population? 1. It will decrease and then increase indeﬁ- nitely. 2. It will die out due to an increase...

**math**

4xsquared=32

**math**

the length of a photograph is 1 cm less than twice the width. the area is 28 cm squared. find the dimensions of the photograph.

**math**

Students are baking muffins to sell to raise money. They bake muffins in trays of 24 muffins each. They want to divide the muffins on each tray into equal packets. Which packet size would result in muffins from each tray being left over? A.3 muffins per packet B.6 muffins per ...

**English/writing**

what is a catchy topic for my essay based on this thesis statement? In Nathaniel Hawthorne's, The Scarlet Letter, it suggests that one must find their own internal strength and strive for individual redemption by applying the beliefs of transcendentalism and individualism ...

**Chemistry Solubility help!!!!!!!!!**

INFORMATION: [HCl] = 0.1388 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: Flask A: Distilled Water (7.4 mL of HCl needed to titrate) Flask B: 0.05 NaOH (12.1 mL of HCl needed to titrate) Flask C: 0.025 NaOH (10.8 mL of HCl needed to titrate) Flask D: 0.0125 N...

**Physics**

A dockworker loading crates on a ship finds that a 22-kg crate, initially at rest on a horizontal surface, requires a 76-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 59 N is required to keep it moving with a constant spee...

**algebra 2nd try**

I need to simplify this 2/∛49 . I figured it out to be (2∛((49)^2))/49 but the system I added my answer to says this is incorrect. Please help me! Thanks anyone.

**algebra**

Simplify 2/root 3(49) I solved it as 2 root 3(49) over 49. the system that I entered it in says this is incorrect. Help I need to understand how to do this problem with steps. I am so confused. Thanks

**Chemistry**

I have done this and got 31.68 for the molar mass. I converted 720.mmHg to .947 atm. T is 304 degrees K. I came up with n=5.47*10^-3. This gives me a molar mass of 31.63. I am being told this is incorrect. I am not sure where I am going wrong. Can you help me? L=.144

**Chemistry**

An experiment shows a 144mL sample of gas has a mass of 0.173g at a pressure of 720mmHg at a temperature of 31 degrees celsius. what is the molar mass of the sample of gas?

**Math**

In right triangle ABC what is the arithmetic mean (average), in degrees, of the measures of the two smallest angles? Explain how the answer is 45 degrees.

**algebra**

Triangles ABC and DEF are similar. Find the area of triangle ABC. Round your answer to the nearest tenth. the answer should be __________m^2 triangle abc has a 12m. triangle def has 12m and 18m.

**Chemistry**

How many grams of Na3PO4 are needed to produce 250mL solution that has an Na concentration of 1.04M?

**College Algebra**

Consider only the discriminant, b2 - 4ac, to determine whether one real-number solution, two different real-number solutions, or two different imaginary-number solutions. 2x2 = -2 -5 Thank you

**Math**

In the word Symmetry, which letters are symmetrical?

**HELP!**

Please it is important!

**Physics**

A space probe is carried by a rocket into outer space where it continues to move on its own in a straight line. What keeps the probe moving? Is the answer: the gravitation forces from diﬀerent stars and planets

**HELP!**

Please help!!!!!!!!!!!

**Physics**

If a Mack truck and Honda Civic have a headon collision, upon which vehicle is the impact force greater and which vehicle experiences the greater acceleration? I know they have same force.

**Physics**

Thanks

**Physics**

1)The Earth exerts an 710 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N 2)If a book is sitting on a table, the force of gravity pulls it down. Why doesn’t it fall? Is it because The table is pushing up on it with a force ...

**Physics**

Thanks

**Physics**

You hit someone with a force of 197 N. How much force is exerted on you? Answer in units of N Is the answer 197 N

**Physics**

You hit someone with a force of 197 N. How much force is exerted on you? Answer in units of N

**algebra**

Solve. x/9-1/7=26/63 STEP 1: The LCM is _________ To clear denominators, multiply each side of the equation by the LCM. _______/1 (x/9-1/7)=__________/1 multiply 26/63. STEP 2: Use the Distributive Property. _____/1 multiply x/9 - _________/1 multiply 1/7 = ______________. STE...

**algebra**

Solve the formula for the variable given. P = r-c/n solve for c. (business) I have worked this problem so many times I'm getting confused. please help. Thanking you in advance

**algebra**

Triangles ABC and DEF are similar. Find the perimeter of triangle DEF. Round your answer to the nearest tenth. ab=4ft bc=6ft ac=5ft de=6ft ef= 9ft there is no feet given for df Please can anyone help me solve this with steps I don't understand how to do this. Thanking you ...

**algebra**

Triangles ABC and DEF are similar. Find the perimeter of triangle DEF. Round your answer to the nearest tenth.

**chemistry**

hemoglobin is the protein that transports O2 through the blood from the lungs to the rest of the body. in doing so, each molecule of hemoglobin combines with four molecules of O2. if 1.00 g of hemoglobin combines with 1.53 mL of O2 at 37 C and 743 torr, what is the molar mass ...

**chemistry**

Solid white P melts then vaporizes at high temperatures. Gaseous white P effuses at a rate that is 0.404 times that of neon in the same apparatus under the same conditions. How many atoms are in a molecule of gaseous white phosphorus?

**CHEMISTRY URGENT!**

for combined gas law

**CHEMISTRY URGENT!**

just one question how do you find the constant k???

**Chemistry**

how many half lives have passed if only 0.625g remain of the original 40g?

**math**

Thank you very much Reiny and also Damon. This is the first time I felt embarrassed helping my son. Sign of things to come of course. As Reiny suggested, we ended up plotting and then selecting less than half a dozen candidates. I also cheated and made a spreadsheet just to sp...

**math**

sorry B=(-2,11)

**math**

My son has been given the collinear problem below that has be stumped two folds. 1- By trying to solve the problem using (y2-y1)/(x2-x1)=slope -- and then, find the (b) in y=mx+b for two points takes way way too long to be a 7th grade probem. My son has already been working on...

**Chemistry**

I got 7516.88J for ?J and mass of soln = 158.2g So my equation is 7516.88 J = 158.2g x 3.78 J/(g·°C)x(Tfinal -21.87) 12.57 = Tfinal - 21.87 Tfinal = 34.44°C Which was wrong. The hint they gave me was Start by finding the amount of heat produced when 70.0 mL of 0...

**Chemistry**

The neutralization of H3PO4 with KOH is exothermic. H3PO4(aq) + 3KOH(aq) -> 3H2O(l) +K3PO4(aq) +173.2KJ 70.0 mL of 0.207 M H3PO4 is mixed with 70.0 mL of 0.620 M KOH initially at 21.87 °C. Predict the final temperature of the solution if its density is 1.13 g/mL and its...

**Chemistry**

Can someone please help with this problem and explain it please? If soil has a density of 1.32 g/cm cubed, then what does 1.0 cubic yards of soil weigh in pounds?

**social science **

1) Which large European city declined significantly in population over the past century? A) Paris B) London C) Rome D) Madrid 2) The industrial city was characterized b A) decentralization B) corporate growth C) manufacturing D) commerce 3) Modern humans have existed for abou...

**Chem**

34.5 g of O2 react with lithium metal to produce solid lithium oxide. How many grams of Li2O are produced

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