Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 2,656

**Chemistry**

I want to see if i got my answer correct for #1 but I need help on #2 1.A 150g aluminum pan containing 500g of water is heated on a stove for 5 minutes. The temperature goes from 23.5C to 48.9C. How much heat was absorbed. (s for Al is .900j/g C, s for H2O is 4.184 j/g C) I go...

**Physics**

In 1996, the Fiberoptic Link Around the Globe (FLAG) was started. It initially involves placing a 27,000 km fiber optic cable at the bottom of the Mediterranean Sea and the Indian Ocean. Suppose the index of refraction of this fiber is 1.56. If all reflections occur at the cri...

**Physics**

In 1996, the Fiberoptic Link Around the Globe (FLAG) was started. It initially involves placing a 27,000 km fiber optic cable at the bottom of the Mediterranean Sea and the Indian Ocean. Suppose the index of refraction of this fiber is 1.56. If all reflections occur at the cri...

**history**

Mahanism emphasized: A. The importance of the navy in imperial expansion B. opposition to the new imperialism of the US C. The spread of Christianity to remote nations D. The equality of people who lived in imperial territories

**geometry**

You are given two segments, with AB = 4 and with CD = 7. Explain how you could use only the congruent-segments construction to construct with EF = 1.

**COM / 220**

I need help with the DQ 2 week 2. Could someone help me please?

**sociology **

The general trend of American's attitudes toward the unmarried has been from an attitude of _____ in the 1950s to an attitude of ______ in the 2000s A.) Non-acceptance; acceptance B.) Neutrality; non-acceptance C.) Non-acceptance; neutrality D.) Neutrality; tolerance I thi...

**sociology **

The general trend of American's attitudes toward the unmarried has been from an attitude of _____ in the 1950s to an attitude of ______ in the 2000s A.) Non-acceptance; acceptance B.) Neutrality; non-acceptance C.) Non-acceptance; neutrality D.) Neutrality; tolerance I thi...

**sociology **

The general trend of American's attitudes toward the unmarried had been from an attitude of _________ in the 1950s to and attitude of _________ in the 2000s

**sociology **

The general trend of American's attitudes toward the unmarried had been from an attitude of _________ in the 1950s to and attitude of _________ in the 2000s

**Physics**

a 45N lithograph is supported by two wires. One wire makes a 25 angle with the vertical and the other makes a 15 angle with the vertical. find the tension in each wire

**Math (Help This Will Be on My Test Tomorrow!)**

y= ax^2+bx-4. How would i find the equation of this parabola with the points (0,-4) (1,0) (2,2) (4,0) and 6,-10)?

**math**

how doo i do my my math homeeework:congruence problems.

**Physics**

A proton has a mass of 1.672 X 10 -27 kg. What is its weight? (using 9.81 for gravity)

**CHEMISTRY: DUE TONIGHT. CHECK MY ANSWER?**

1. For the simple decomposition reaction below, rate = k[AB]2 and k = 0.40 L/mols. AB(g) A(g) + B(g) If the initial concentration of AB is 1.60 M, what is [AB] after 13.0 s? ANSWER: (.4)(13)=5.2 1/1.6=.625 5.2-.625=4.575 1/4.575= .2185 I tried .22 & .21. They are both wrong. I...

**spelling **

i need words that end with ant and ance but they have to be the same words like distant/distance

**Stoichiometry**

1. Iron reacts with oxygen according to the following equation: Fe + O2→ Fe2O3 a. Balance the equation. b. Assuming you start with 15.0 g of iron, how many dm3 of oxygen are required to react? c. How many molecules of oxygen is this?

**Biology**

What did Darwin believe is the consequence of overpopulation in animals and plants?

**Biology**

Darwin believed that Malthus' ideas about human populations applied more strongly to animals and plants. Why?

**Physics**

A British company makes optical fibers that are 13.6 km in length. If a beam of light travels along one of those fibers, always reflecting at the critical angle, it will travel 20.3 km. What is the index of refraction of the fiber material?

**chemistry**

how many kg does h2o have

**Physics**

Thank you!

**Physics**

A vat in England nicknamed "Strongbow" is 19.7 m tall, but how wide is it? Suppose the vat is filled with water. A ray of light enters the water from the air at one end of the vat, reflects off the bottom at the vat's center, and exits at the opposite end of the ...

**Physics**

A vat in England nicknamed "Strongbow" is 19.7 m tall, but how wide is it? Suppose the vat is filled with water. A ray of light enters the water from the air at one end of the vat, reflects off the bottom at the vat's center, and exits at the opposite end of the ...

**Physics**

Thanks so much!

**Physics**

The maximum depth of Lake Baikal, in Russia, is 1637 m, making it the world's deepest freshwater lake. If a beam of light with an angle of incidence of 60.0 degrees enters the water from the air, what is the horizontal distance between the point where the light enters the ...

**marketing**

Your manager has asked you to investigate the Internet marketing strategies used by the company's major competitors. Use the library, the Internet, and any other resources to research competitors and prepare a presentation. Here are the questions to address for each of the...

**Math **

How many possible license plates are possible in which two letters are followed by at least 1 digit and no more than 4 digits?

**Physics**

On vacation, your 1200- car pulls a 540- trailer away from a stoplight with an acceleration of 1.50. What is the net force exerted by the car on the trailer?

**Math**

Mr.Jensen is buying 2 dozen donuts for $10.98. True or False. The expression 8.5 x 2/10.98 could be used to represent the cost of 8.5 dozen donuts.

**bookkeeping**

What is the total liabilities and owner’s equity in the balance sheet you prepared in Exam Figure 4?

**U.S History**

Which of the following caused a split in the womens's suffrage campaign? a.Alice Paul's aggressive strategy b.Carrie Champan Catt's "winning plan" c.The decision to press for a constitutional amendment d.world war 1

**general psychology**

how may psychology be understood as both an art and a science?

**Physics**

A 4.2-kilogram block sliding down a ramp from a height of 4.5 meters above the ground reaches the ground with a kinetic energy of 33 joules. The total work done by friction on the block as it slides down the ramp is approximately:

**chemistry**

An aqueous solution of nacl has a mole fraction of 0.21. What is the mass of NaCl dissolved in 100.0 mL of solution?

**Chemistry**

An unknown element Q has two known isotopes: 60Q and 63Q. If the average atomic mass is 60.5 amu, what are the relative percentages of the isotopes?

**Chemistry**

An unknown element Q has two known isotopes: 60Q and 63Q. If the average atomic mass is 60.5 amu, what are the relative percentages of the isotopes?

**chemistry**

the shape and nonding in a Br2 molecule is best described as

**chemistry**

if you mix 50ml of 0.1 tris acid with 60ml if 0.2m tris base, what will be the resulting pH?

**chemistry**

If the solubility of a particular solute is (10 g/100 g H2O) at 20°C, what solution concentration would represent a supersaturated aqueous solution of that solute?

**accounting**

Connection Station, an internet café, had the following operating activities during the month of May: 1. Bought 800 in jump drives and disks, which are available for resale from Office Depot on credit 2. Paid 900 in utilities for the month of may 3. Paid 2000 rent for t...

**Socials Studies**

The puritans had a long-lasting effect on English society and, to some extent, our own. What would be some aspects of society today that seem "puritan" in origin? I really need help on this.. Please, and thank you :-)

**intro to chemistry**

how to come come up with a significant digits poam

**chemistry**

how do i come up with POEM about significant digits please help

**algebra**

yes

**Physics**

4.407

**physics**

A football is kicked with an initial speed of 18 m/s at an angle of 36 degrees above the horizontal. (a) What is the maximum height that it reaches? (b) At what time does it land? (c) How far horizontally does it travel?

**physics**

A 59.0-Ω resistor is connected in parallel with a 116.0-Ω resistor. This parallel group is connected in series with a 15.0-Ω resistor. The total combination is connected across a 15.0-V battery. (a) Find the current in the 116.0-Ω resistor. ______A (b) Find...

**childcare**

ALL WRONG EXCEPT FOR A FEW !!!! WTF ITS CALLED HOMEWORK HELP FOR A REASON

**algebra**

1-2x-5=4x+2

**chemistry**

1. If a gaseous sample contains 73% N2 by volume, what is the solubility of N2 in water at 25°C and 1.0 atm (kH in H2O at 25°C = 7.0 10-4 mol/Latm)? 2. Calculate the vapor pressure of a solution of 0.60 mol of cholesterol in 4.5 mol of toluene at 32°C. Pure toluene...

**Physics**

how do i solve for time when i don't know initial velocity?

**Physics**

A ball is thrown horizontally from the top of a building 55.4 m high. The ball strikes the ground at a point 65 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion in seconds.

**Physical science**

A ball thrown upward reaches a height of 13m. How much time did it take to get to this height? How much time will take to fall to the ground?

**physics**

A car moving at 10m/s when it begins to be accelerated at 2.5m/s^2. (a)How long does the car take to reach a speed of 25m/s? (b) How far does it go during this period

**Chemistry**

A 0.75 L bottle is cleaned, dried, and closed in a room where the air is 20°C and 42% relative humidity (that is, the water vapor in the air is 0.42 of the equilibrium vapor pressure at 20°C). The bottle is brought outside and stored at 0.0°C. (See Table 5.2) (a) W...

**AP Chemistry **

The answer is 50.0 torr and I got 46.0 torr but idk what I did wrong. Find the vapor pressure of a solution of 164 g of C3H8O3 and 338 mL of water at 39.8 degrees Celsius. Water's VP at 39.8 degrees celsius is 54.74 torr; it's density is 0.992 g/mL.

**chemistry**

how do you find the rate of production when you already know the rate of consumption? kinetics questions

**English**

Can you tellion. me what to put in this sentence? (comma, semicolons, hyphens, colons) 1. Thank you Dr. Smith for seeing this patient in pulmonary consulat

**physics**

A steel ball is dropped from a diving platform (with an initial velocity of zero). Use the approximate value of g = 10 m/s2. (a) Through what distance does the ball fall in the first 1.5 seconds of its flight? (b) How far does it fall in the first 4 seconds of its flight?

**math **

after school chase spends 20 min reading 30 min practicing the piano 15 min cleaning his room, and 40 min doing his homework, chase is busy for 105 min what fraction of the time does he spend cleaning his room?

**MATH**

determine the sum of: 50 over Σ 8(.5)^n-2 n=1

**financial planning**

Identify two cash management products and provide a short description of each. Do you have any experience with these products?

**math**

how do you do expanded algorithm? here's an example to use for the answer 58*26

**Math**

f(x) = 10x - 5 What is the value of f^-1(-4)?

**Math**

Mary drove from Amity to Belleville at a speed of 50 mph. On the way back, she drove at 60 mph. The total trip took 4 2/5 hours of driving time. Find the distance between these two cities. Any help would be greatly appreciated! =]

**math**

i'm sorry the second equals sign should be a + sign

**math**

-3(4b-10) = .5(-24b=60) find the value of b

** math**

here are the steps use distributive property to: 3 x g - 3x3 = 6 simplify to: 3g - 9 = 6 9+6 = 15 15 divided by 3 = 5 so, g = 5

**Physics**

Time intervals measured with a stopwatch typically have an uncertainty of about 0.2 s, due to human reaction time at the start and stop moments. What is the percent uncertainty of a handtimed measurement of (a) 5 s, (b) 50 s, (c) 5 min?

**computer science**

what language are you using def main(): for i in range(3) number = eval(input('Enter a number?')) pirnt(number)

**statistics**

1. Suppose the number of students in line during office hours: # of Students (X) Probability P(X) 0 0.40 1 0.30 2 ???? 3 0.10 a. If you knew that the number of students in line was between 0 and 3, what is the probability that will be 2 students in line when you arrive at the ...

**Psychology**

Thank you very much. This has been very helpful.

**Psychology**

• Post a 200- to 300-word response to the following: Describe the stages of sleep. In which stage do we dream? What are the five common beliefs about dreaming? What are the two common theories about dreams? Which of the two theories do you agree with? Explain. I am having...

**stats help!**

thank you in advance! in a given year the college admissions office accepts applicants from students, who are then either accepted or not accepted. accepted students may or may not decide to attend college. suppose the scores on a certain entrance exam for applicants of murphy...

**dressmaking**

thank you !!! im doin pennfoster an u helped me out alot :)

**dressmaking**

thank you !!! im doin pennfoster an u helped me out alot :)

**math**

554

**algebra 1b**

A customer wants to make a teepee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the teepee, and he wants the teepee to be 12 feet across and 8 feet tall (see figure). How long should the pieces of PVC plumbing pipe be?

**chem**

how many grams of hydrogen chloride is needed to produce 200 grams of hydrogen

**Math**

Find the volume of a rectangular pet carrier whose dimensions are 18.20 in wide, 14.00 in long, and 18.80 in high. Report the answer to the nearest hundredth of a cubic inch.

**geometry**

If BC = 2x + 1, CD = 3x - 4 and BD = 22, find the value of x.

**8th Grade Chemestry**

You are sledding on a snow-covered hill at a speed of 6 m/s. There is a drop that increases your speed to 12 m/s in 4 s. Find your acceleration.

**science **

what cause breast cancer?

**math**

r = 2/3t + v, for t

**Physics**

A block weighing 9.7 N requires a force of 2.6 N to push it along at constant velocity. What is the coefficient of friction for the surface?

**math **

patty has 123 cds in her music collection. of her cds 27 are country music. estimate the percent of patty's cds that are country music cds

**math **

patty has 123 cds in her music collection. of her cds 27 are country music. estimate the precent of patty's cds that are country music cds

**Chemistry**

If 3.0 moles of HCl are consumed in the reaction below, how many moles of FeCl3 are produced? 6HCl + Fe2O3 --> 2FeCl3 + 3H2O

**Chemistry**

In the equation: Fe(NO3)3 (aq) + 3KSCN (aq) forms FeSCN3 (aq) + 3KNO3 (aq) What type of reaction is this? why are there two aqueous solutions as products? Is there a secondary reaction? Finally is there a name for these products?

**science**

In the equation: Fe(NO©ý)©ý (aq) + 3KSCN (aq) ¡æFeSCN©ý (aq) + 3KNO©ý (aq) Why do two aqueous solutions form? What is this calle? Is there a seconday reaction?

**Science 6th grade**

I know definitely that it is 3

**Physics**

A 200kg motorcycle is driving in a circular path at 1 rev per 5 seconds and the circle has r=12m

**chemistry**

Both H2O and CO2 have 3 atoms, yet one is polar and one is nonpolar. Explain why, using Lewis dot structures in your answer

**calculus**

Find the volume of the solid whose base of a solid is the region bounded bythegraphsofy=3x,y=6,andx=0. Thecross␣sections perpendicular to the x ␣ axis are rectangles of perimeter 20.

**calculus**

Find the volume of the solid whose base of a solid is the region bounded bythegraphsofy=3x,y=6,andx=0. Thecross␣sections perpendicular to the x ␣ axis are rectangles of perimeter 20.

**Chemistry (URGENT)**

A gas mixture with a total pressure of 770 contains each of the following gases at the indicated partial pressures: CO2 , 249mmHg ; , Ar 114mmHg ; and , O2 174mmHg . The mixture also contains helium gas. 1. What is the partial pressure of the helium gas? 2. What mass of helium...

**Chemistry**

Green Light has a frequency of about 6.00 * 10^14 s^-1. What is the energy of the green light?

**geometry**

What is the distance from the origin to the point (14,11)?

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