Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 131

**thermodynamics**

hope to solve it before 29 of may

**thermodynamics**

design a 1200-W electric hair dryer such that the air temperature and velocity in the dryer will not exceed 50 C and 3 m/s respectively

**math**

if you tossed 2 nickles 100 times, how many times would you expect to get a)2 heads b)2 tails c)1 head and 1 tail

**math**

suppose 2 nickles are tossed at the same time what are the possible outcomes? what are the possiblility of getting a)2 heads b)2 tails c)1 head and 1 tail

**math ratios**

the blue jays baseball team won 17 games and lost 14 games. what is the ratio of wins to losses?

**science**

If a forest ecosystem is removed through clear cutting, their loss is due to _______ my answer is land development. am I correct?

**science**

Which of the following statements correctly states how human activity and biodiversity affect one another. A)as humans develop land for homes and industry, biodiversity increases. B)as humans restrict fishing and oil drilling, biodiversity decreases. C)as biodiversity decrease...

**calculus help**

A drinking cup is made in the shape of a right circular cylinder. for a fixed volume, we wish to make the total material used, the circular bottom and the cylindrical side, as small as possible. Find the ratio of the height to the diameter that minimizes the amount of material...

**calculus help**

for f(x)= ln(x-3) on the interval [5,9], find c so that f'(c)= (f(b)-f(a))/(b-a)

**Calculus Help Please!!!**

Ornithologists have determined that some species of birds tend to avoid flights over large bodies of water during daylight hours. It is believed that more energy is required to fly over water than land because air generally rises over land and falls over water during the day. ...

**Calculus Help Please!!!**

Does the function satisfy the hypotheses of the Mean Value Theorem on the given interval? f(x) = 2x^2 − 5x + 1, [0, 2] If it satisfies the hypotheses, find all numbers c that satisfy the conclusion of the Mean Value Theorem. (Enter your answers as a comma-separated list....

**Calculus Help Please!!!**

Two carts, A and B, are connected by a rope 39 ft long that passes over a pulley P (see the figure). The point Q is on the floor h = 12 ft directly beneath P and between the carts. Cart A is being pulled away from Q at a speed of 3.5 ft/s. How fast is cart B moving toward Q at...

**Chemistry Help Please!!!**

1) using kb for NH3 calculate ka for NH4+ ion. Compare this value with that calculated from your measured ph's? 2) how should the pH of a 0.1M solution of NaC2 at H3O2 compare with that of a 0.1 M solution of KC2H3O2? Explain briefly? THANK YOU!

**Chemistry Help Please**

Using standard thermodynamic data from Appendix L of your text, calculate the equilibrium constant at 298 K for the following chemical reaction: CO(g) + H2O(l) CO2(g) + H2(g). Show work please! Thank you!!!

**Chem Check Please!!!**

Using standard thermodynamic data from Appendix L of your text, calculate the equilibrium constant at 298 K for the following chemical reaction: CO(g) + H2O(l) CO2(g) + H2(g). Show work please! Thank you!!!

**Calculus Help**

Find the derivative of the following function showing your work and fully simplifying your answer. f(x)=(8x-3)^5/(6x+7)^12 Thank you!!!

**Math**

Which is more, 2 liters or 201 centiliters?

**CHEM**

the number of nonbonding electrons exceeds the number of bonding electrons in the lewis structure of which of the following molecules? I am having a problem with the Lewis structures. HCN NH3 H2O please explain the structure thank you so much

**CHEM**

In which of the following pairs of compounds are both members of the pair molecular compounds? PCl3 and LiBr CCl4 and KOH NaH and CaF2 Please explain. thank you so much

**CHEM**

a period 2 nonmetal, X, forms the molecular compound NX3. Which of the following are also correct formulas for molecular compounds involving X? HX OX2 C2X pleas explain why thank you so much

**Physics**

A particle moves according to the equation x= (10 m/s^2)t^2 where x is in meters and t is in seconds. a. Find the average velocity for the time interval from t1= 2.38 s to t2= 4.3 s. Answer in units of m/s. b. Find the average velocity for the time interval from t1= 2.38 s to ...

**pol201**

The Annapolis Convention was called to address smaller states would get more representation than larger states. the people would select the House of Representatives as a practical expression of democracy. the House would select the Senate and the legislature as a whole would s...

**Chemistry**

cd2+ (aq) +ni(s)---> cd(s) + ni2+ (aq) what is the half reaction

**Chemistry**

cd2+ (aq) +ni(s)---> cd(s) + ni2+ (aq) what is the half reaction

**Chemistry**

cd2+ (aq) +ni(s)---> cd(s) + ni2+ (aq) what is the half reaction

**science**

How do i plot i schild plot with this data: Conc (M) 10^-8 Ec50= (microM) 12

**Chemistry**

Consider the titration of 25.0mL of 0.10M HAc with 0.10M NaOH. That is, NaOH is added to HAc. (a)pH at the beginning of titration. (b)pH at the equivalence point of the titration. (c) pH at the midpoint of the titration.

**statistics**

how could you reword these research hypoteses to null hypoteses? a) smoking during pregnancy increse the risk of a child being born orematurely. b) regular exercise in older adults decreases blood pressure levels.

**Science Question**

Which of the following statements best describes what is happening in a water softening unit? The hard ions are all trapped in the softener, which filets out all the ions. The ions in the water softener are softened by chemically bonding with sodium. The sodium is removed from...

**Physics**

A shopper stands 0.6 m in front of a diverging mirror of focal length 0.2 m. Where is the image located and what is the magnification?

**geometry**

A rectangular wall is 22.7 feet long and 7.5 feet high. If the door in the wall is 2 feet wide and 6.5 feet high, what is the area of the wall excluding the door?

**Science**

Thanks

**Science**

A car traveled at an average speed of 60 mph for two hours. How far did it travel? A. 30 miles B. 60 miles C. 120 miles D. 150 miles

**Sience**

Thanks

**Sience**

Hurry!!!!!!!!!!!!!!!!!!!!!!!!!!!! Which of the following is a speed, not a velocity? A. 35 m/s east B. –35 m/s C. 35 m/s D. 35 m/s south

**Algebra**

Find P(rolling 2 or 5) with one number cube. A. 1 B. 1/6 C. 1/3 D. 1/2

**Question about APA citations**

I'm typing a paper and I'm SO confused. My question is: Using APA stle, how do I write the PAGE NUMBERS at the end of the sentence. For example my sentence would be: The reason pigs can fly is because they have wings(Jones, 32)....THIS IS THE CORRECT WAY TO USE PAGE NU...

**Physics**

A transformer has 25 turns in the primary coil and 200 turns in the secondary coil. If 12 V is connected to the primary coil and a 20-Ù device is connected to the secondary coil, calculate the current in Amperes passing through the device.

**algebra 1**

In 1975, when the United Nations was formed, there were 51 member nations. In 1987, there were 159 member nations. Write an equation that gives the number of nations in the UN, y, in terms of the year, t. Let t=0 correspond to 1945 and assume that membership followed a linear ...

**Math**

Justin wants to use 188 ft of fencing to fence off the greatest possible rectangular area for a garden. What dimensions should he use? What will be the area of the garden? ~ A. 89 ´ 99 ; 8811 ft B. 92 ´ 96 ; 8832 ft C. 94 ´ 94 ; 8836 ft D. 93 ´ 95 ; 883...

**Pre-Algerbra**

Someone help explain? Justin wants to use 188 ft of fencing to fence off the greatest possible rectangular area for a garden. What dimensions should he use? What will be the area of the garden? ~ A. 89 ´ 99 ; 8811 ft B. 92 ´ 96 ; 8832 ft C. 94 ´ 94 ; 8836 ft ...

**Pre-Algerbra**

A basketball drops from a height of 76 in. On bounce 1, it rebounds to a height of 38 in. On bounce 2, it rebounds to a height of 19 in. How high does the basketball bounce on bounce 3? ---- A. 9 inches B. 19 inches C. 9.5 inches D. 4.75 inches

**physics**

You push a 8.00 kg suitcase across a smooth horizontal floor applying a force directed 31.5 degrees below the horizontal. Someone measures the acceleration of the suitcase to be 1.73 m/s2. Assuming g = 10.0 m/s2, what is the normal force the ground exerts on the suitcase?

**physics**

You foolishly attempt to jump across a crevasse whose far side is W = 2.93 m away horizontally, and H = 1.35 m lower vertically. What minimum horizontal velocity must you have to make it to the other side? Assuming you have the minimum velocity you just calculated in the previ...

**English Vocabulary**

Is it better to use enmity or enmities in the sentence below? The _________ between teams during the olympics was just for the sake of supporting their teams; there weren't really any hard feelings between the teams or players.

**MATH**

27.40 for 4 hours of work

**AP Chemistry, Chem, science**

Can anyone please help me with this problem?? =/ The reaction between solid sodium and iron (III) oxide is one in a series of reactions that inflates an automobile airbag. If 100g of sodium and 100g of iron(III) oxide are used in this reaction, determine: a. the balanced react...

**American History **

After the Spanish-American War, the _______ reserved the right of the United States to intervene in Cuba's internal affairs.

**health**

omg this is funny me too!

**jess**

Sadie the dog is sitting on the roof of his doghouse, 4.5 ft off the ground. He is watching a cat that is 16 ft away from the base of the doghouse. What is the angle of depression from the roof of the doghouse to the cat? Round to the nearest hundredth.

**science**

an abiotic factor

**math**

what is 4.505 = in thousanths

**Math**

t=3

**Combinatorics**

Entropy 1. Suppose a room has n molecules of a gas. We divide the room into k equal parts. How many ways can the molecules be split evenly between the parts (you may assume that n is divisible by k)? How many ways can the molecules be in only one part? What are the most common...

**combinatorics **

1. You have k slots (of the same size) to drop n tokens into. How many ways can you do this if the tokens are marked? Unmarked? (Hint: try with 3 tokens and 7 slots first) 2. What is the probability of getting them all in the unique “winning” slot? (Do you use the ma...

**The Great Gatsby**

Why did Daisy and Tom spend a year in France? in the great gatsby They wanted their little girl to learn French. There was no reason. Tom’s family bought a house in Paris. i believe the answer is 3?

**english**

Jack Kerouac gave the Beat Generation their name because he claimed that his generation of writers was beaten down by (pick one) materialism. politics. religion. traditionalism.

**math**

i need a list of data with the mode 15 min 5 median 10 max 20

**geometry**

JUSTIN BIEBER

**math**

A park has 18 swings. 3/9 of them are tire swings. how many of the swings are tire swings?

**chemistry**

A 13.0-g sample of ice at -13.0°C is mixed with 105.0 g of water at 78.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g · °C, respectively, and the e...

**biology**

A 28.0-g sample of ice at -18.0°C is mixed with 124.0 g of water at 85.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g · °C, respectively, and the e...

**math**

a rectangular dield isto be enclosed with1120ft of fencing. If the length of the field is 40ft longer than the width, then how long is the field?

**statistics**

The number of independent errors in a transmitted message of n symbols follows a Binomial distribution. The probability of an error in transmission is .001. If 2,000 symbols were sent, a) Find the expected number of errors. b) Write out the formula for the distribution of erro...

**Physics**

Oh I forgot about displacement. Thank you very much.

**Physics**

In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to returning? Would ...

**Math**

In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to returning? Would ...

**algebra**

Simplifying Rational Expressions: a^3-2a^2/2a^2-4a

**Chemistry**

Should turn red

**physics**

The diagram represents a snapshot of a standing transverse wave on a flexible guitar string taken when the displacement is at a maximum. (Note: the vertical scale is very exaggerated, the actual sideways displacement of the string is negligibly TINY compared to the length of t...

**Math**

A math teacher drove by a playground that was full of boys and dogs.The teacher notice there were a total of 40 heads and 100 feet. Hom many boys and how many dogs were there?

**Math**

Replace A,B,C with numbers so that: A*A=B B-A=C A+A=C

**physics**

it's true but ur answer is in cal you need to multiply it by 4.18 to convert it to joul

**physics**

A car engine has 90 kW and an efficiency of 12 percent. Let's assume a simple model of air friction, Fair=Kv2 , with K=027kgm for this car. If there is no other friction, and no winds, what is the maximum speed it can reach?

**Physics**

A car (mass 980 kg) drives up a hill (height 335 m) in 146 seconds. At the bottom of the hill, it has a speed of 23 m/s, but at the top, it has slowed down to 11 m/s. Neglecting friction, what is the average engine power?

**Physics**

A bicyclist on an old bike (combined mass: 96 kg) is rolling down (no pedaling or braking) a hill of height 103 m. Over the course of the 278 meters of downhill road, she encounters a constant friction force of 323 Newton. If her speed at the top of the hill is 7 m/s, what is...

**Pre-Cal**

A box with a square base and an open top is constructed from 5400 cm^2 of cardboard. Find the dimensions of the largest possible box. I know the answer is : base lenght - 42.4 cm height- 21.2 cm please help me, thank you so much :)

**geology**

We determine the structure of the Earth's core using: a)deep mine shafts b)satellite imaging c)radar and sonar d)seismic wave data e)magnetic resonance imaging

**space science**

In blackbody radiation, the energy is radiated uniformly in every region of the spectrum, so the radiating body appears black in color. true or false?

**math**

give the dimensions of rectangles with perimeters of 70ft and length to width ratios of 3to4 4to5 and 1to1

**math 213**

50%

**algebra**

how would you solve this problem.... ã 9x^2 y/32z^2?

**algebra**

Jean jogged for 2 miles and then walked for 3 miles. Took her 1 1/3 hours. If she jogged twice as fast as she walked, what was her walking rate?

**English**

In the princess bride, how are the characters altered to fit the parody style of the movie.

**English **

Example essay is an essay composed of many examples i guess. I know it can be written on anything but i want my essay to be interesting.

**English **

Whats a good topic for an Example essay?

**English **

Yay thank you

**English **

well i read the essay, i think its a good example essay because she uses plenty example of what being homeless is and explains what not being homeless is with great emotion,by using herself as an example. Am i close?

**English **

What makes Anna Quindelen Homeless a good example essay ?

**English **

Identify the parallel element in the sentence? Eating an animal has not always been an automatic or an everyday affair;it has tended to be done on solemn occasions and for a specific treat.

**spanish**

can you tell me where i can find information and video about Argentina ?

**writing **

Cons?

**writing **

can any one tell me the pro of oniomania

**English **

Thank you. I think i have it now, just one more question can an introduction be two sentences or does it have to be five or more. thank you for your patients

**English **

IM SO STUCK! I dont know where to start... i have everthing i need to write my essay but i cant begain to write it. please help me. my paper is due tomorrow

**English**

shop to live or live to shop keep in mind i have never written a compare and contrast essay

**English**

Ok so what if i wanted to compare and contrast frugality and oniomania in subject by subject format How would i start the introduction what would i compare and contrast I already Brainstormed and i made my list, i also have my thesis statment but im sure how to write the essay

**english **

Im writing my essay on Onomania but i cant come up with the important points to talk about

**English **

I have a compare and contrast essay to do, and i need it to be really good, its about Oniomania and Frugality.I have already made my list for the compare and contrast part but i cant come up with a thesis statement to link the two and also separate them at the same time... plz...