Friday

September 30, 2016
Total # Posts: 3,174

**Chemistry 151**

Of the following transitions in the Bohr hydrogen atom, the ____ transition results in the emission of the highest-energy photon. a.n=1, n=6 b.n=6, n=1 c.n=6,n=3 d.n=3,n=6 e.n=1,n=4

*November 8, 2010*

**algebra **

No, 6(-10-2)=-72 not 70

*November 8, 2010*

**math**

No, I don't believe there's another answer. I think that 22 is the only answer.

*November 7, 2010*

**Math**

To find the hypotenuse you need to know the pythagorean theorem where a^2 + b^2 = c^2. Here a and b are the sides of the triangle that make the right angle and c is the hypotenuse. If you plug it in to that equation you should have your answer.

*November 7, 2010*

**Physics**

A uniform ladder 5.0 m long and weighing 200 N is placed against a very smooth wall so that the lower end of the ladder is 3.0 m from the wall. If the coeficient of friction between the ladder and the ground is 0.50, determine the maximum distance that a 700 N man could climb ...

*November 7, 2010*

**Math**

You have to translate this into math terms. "Is" is the same thing as = and "of" is the same thing as a multiplication symbol. You also have to remember that 98%=.98. You should then have 6=.98x and when you divide each side by .98 your answer should be ...

*November 7, 2010*

**math**

When x=0 because if you plug 0 in for x the result is 0.

*November 7, 2010*

**Physics**

A 0.18 kg point mass moving on a frictionless horizontal surface is attached to a rubber band whose other end is fixed at point P. The rubber band exerts a force F = bx toward P, where x is the length of the rubber band and b is an unknown constant. The mass moves along the ...

*November 4, 2010*

**Algebra**

Hi. I have an answer for this and just need to confirm it. 2x+5(less than or equal to sign here)x + 6. I minused the x's on both sides of the greater then equal to sign; x +5 (greater then or equal to sign) = 6; x +5-5 (the sign here) 6-5 gives me x (greater than equal to ...

*November 4, 2010*

**5th grade**

1,568 divided by 14

*November 3, 2010*

**Physics, Propagation error**

Does anyone know how to find the propogation error for this equation? K_i = 1⁄2 m_b v_i^2 = ½ (.069g)(6.49m/s)² = 1.45(kgm²)/s² Thank you so much!

*November 3, 2010*

**Physics**

please help !! A 10 kg sled is pulled horizontally by a force. If the coefficient of static friction is 0.3 , what force is needed to get the sled moving at a constant velocity?

*November 3, 2010*

**Momentum Problem**

A cart of mass m1 = 15 kg slides down a frictionless ramp and is made to collide with a second cart of mass m2 = 23 kg which then heads into a vertical loop of radius 0.21 m. (a) Determine the height h at which cart #1 would need to start from to make sure that cart #2 ...

*November 3, 2010*

**Debate: Policy**

I'm trying to find articles and information about the U.S. Armed Forces. I've been trying to find some info for hrs. could you send me some links to websites that could help me? THANKS.

*November 2, 2010*

**operational management**

Activity Time Predecessor(s) A 3 None B 4 A C 3 B D 5 B E 10 C, D F 3 E G 6 E H 5 G, F Please assist with finding the ES, EF, LS, LF and slack time for ALL activities. also, the critical path? and, the project completion time?

*November 2, 2010*

**spanish**

Si, las estoy preparando. Si, lo estan limpiando.

*November 1, 2010*

**Word within the Word Analogy Help list 12**

HELP do you know the answer to any on word within word list twelve?!

*November 1, 2010*

**Physics**

A father (mF = 83 kg) and his daughter (mD= 43 kg) stand on a flat frozen lake of negligible friction. They hold a 13 m long rope stretched between them. The father and daughter then pull the rope to bring them together. If the father is initially standing at the origin, how ...

*November 1, 2010*

**Chemistry**

If 3.50g of Na3Po4 and 6.40g of Ba(No3)2 are added together how many grams of Ba3(PO4)2 will be produced? Which is the limiting reactant? Please explains step by step THANK YOU

*October 31, 2010*

**english**

Thank for ur help, i'm not good writer!

*October 31, 2010*

**english**

This what I wrote about the word "ABuse" and its history. Please tell me if I am definding the word correctly with examples and if my sentences are structured. Your help is apprected. To certain people the word abuse has many meanings; thus the word abuse itself was ...

*October 31, 2010*

**algebra**

59=8y+3

*October 31, 2010*

**Physics**

What property of Maxwells equations results in electromagnetic waves? A. Moving charges create B B. There are no magnetic monopoles C. delta E/Delta t creates B and delta B/delta T creates E D. Charges create E and currents create B

*October 30, 2010*

**Physics**

I have a 250- turn circular coil of wire, 0.10 m in diameter, perpendicular to a 0.050 T magnetic field as shown below. I flip the coil 180 degrees in 1/30 of a second. What is the average voltage created across the ends of the coil? A. -6.0 V B. -12 V C -3.0 V D. -24 V

*October 30, 2010*

**Physics**

The Earth's magnetic field above the Earth's equator is about 10^-4 north. If a proton is intially moving downward at 5*10^5 m/s, it will? A. curve east, making a circle with r= 50 m. B. curve west, making a circle with r=50 cm C. curve east, making a circle with r= 3 ...

*October 30, 2010*

**Physics**

Which way does the magnetic vector B point in the vicinity of the Earth's North Pole? A. Upward B Downward C. Horizontally D. THere is no magnetic field at the North Pole

*October 30, 2010*

**Physics**

Number 10 aluminum wire (radius= 1.3 mm) is commonly used for electrical installations in homes. What is the voltage drop in 20 m of this wire if it carries a current of 10 Amps? The bulk resistivity of aluminum is 2.7*10^-8 Ohm*m A) 1.3 V B) 1.9 V C) 1.0 V D) 2.5 V

*October 30, 2010*

**bussiness management**

For this discussion use the Critical Thinking Process to analyze the problem-solving the individuals may apply in the case study, "Elective Surgery Department Faces Decreased Patient Satisfaction." Share your chosen role and your role's ideas for the planning ...

*October 30, 2010*

**English**

Can someone check my answers for me. We're learning about commas...did I put them in the right places. 1. Pottery provides important archaeological artifacts for it is abundant, identifiable, and well preserved. 2. Yes, I do think that I must stop aggravating you. 3.Many ...

*October 30, 2010*

**poetry**

Can somebody list some poems that is considered as a "Poetry Survivor" (a best poem that relates to the TV show "Survivor"

*October 28, 2010*

**english**

I picked topic which is Abuse and the history of the word which is misuse. Please tell me ways to write about this word and what can i compare it to. I have to write the meaning of the word, including its history. Thanks for helping me.

*October 28, 2010*

**math111(3)**

The function f(x)=(x+6)^2 is not one-to-one. Choose the largest possible domain containing the number 0 so that f(x) restricted to this domain is one-to-one. The largest possible domain is [-6,infinity) If the restriction function is written F, then inverse function F^{-1}(y)=...

*October 27, 2010*

**math111(2)**

Suppose h(x) = x^2 + 8 x + 5, with the domain of h being the set of positive numbers. Evaluate h^{-1}(8).

*October 27, 2010*

**math111**

Suppose the graph of f is a parabola with vertex at (2,1). Suppose g(x) = 3 x + 2. a) What are the coordinates of the vertex of the graph of g(composed)f? b) What are the coordinates of the vertex of the graph of f(composed)g?

*October 27, 2010*

**Chemistry**

How many atoms of mercury are present in 5.4 cubic cm of liquid mercury? The density of mercury is 13.55g/cc. mass Hg = volume x density Then convert to moles. Then remember there are 6.022E23 atoms for every mole. I still don't get how to do this! HELP ME!!!

*October 27, 2010*

**Chemistry**

1. Calculate the number of moles of carbon atoms present in 2.4g of ethanol (C2H6O). 2. What is the % Nitrogen by weight in 3.696 mol of ammonium sulfide. 3. How many atoms of mercury are present in 5.4 cubic cm of liquid mercury? The density of mercury is 13.55g/cc.

*October 27, 2010*

**chemistry **

How to make into compounds to get a formula? Li+: Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Cu:Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Pb2+:Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Ca2+:Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Al3+:Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Cr5+:Br-, O2-, CN-, SO3^2-, ...

*October 27, 2010*

**literary**

Thank you!

*October 27, 2010*

**literary**

In what distant deeps or skies Burnt the fire of thine eyes? On what wings dare he aspire? What the hand dare seize the fire? and Tyger! Tyger! burning bright In the forests of the night, What immortal hand or eye Could frame thy fearful symmetry? Are "In what distant ...

*October 27, 2010*

**Math 111**

Thank you so much!!!

*October 27, 2010*

**Math 111**

Find the quadratic function that has vertex (-1, 8) and whose graph goes through the point (8, 170). I could not understand this problem I Can not for the lift of me get it. I got as far as some number(x+1)^2+8 but i dont know what the number before all that would be for the ...

*October 27, 2010*

**Chemistry**

How to make into compounds to get a formula? Li+: Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Cu:Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Pb2+:Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Ca2+:Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Al3+:Br-, O2-, CN-, SO3^2-, PO3^3-,MnO4- Cr5+:Br-, O2-, CN-, SO3^2-, ...

*October 27, 2010*

**MATH**

Earth, Jupiter, and Uranus all revolve around the sun. Earth takes 1 yr, Jupiter 12 yr, Saturn 30 yr, and Uranus 84 yr to make a complete revolution. One night, you look at those three distant planets and wonder how many years it will take before they have the same position ...

*October 27, 2010*

**Math**

She will have 56.00

*October 27, 2010*

**physics**

A projectile is fired at an upward angle of 45 degrees from the top of a 265 m cliff with a speed of 350 m/s. What will be it's speed when it strikes the ground below?

*October 26, 2010*

**english**

Describe your experience with credit and credit cards in a brief paragraph using at least five adverbs and five adjectives in your description. Bold the adverbs and underline the adjectives

*October 25, 2010*

**College Chemistry**

1) A 25mL sample of the .265M HCI solution from the previous question is titrated with a solution of NaOH. 28.25mL of the NaOH solution is required to titrate the HCl. Calculate the molarity of the NaOH solution. 2) A 1.12g sample of an unknown monoprotic acid is titrated with...

*October 25, 2010*

**Organic Chemistry**

Separation scheme for isolating benzoic acid Could you please show me a separation scheme for isolating benzoic acid from a reaction mixture if mixing a Grignard reagent phenylmagnesium bromide with dry ice (CO2) in ether? Thanks!

*October 22, 2010*

**Science**

Separation scheme for isolating benzoic acid Could you please show me a separation scheme for isolating benzoic acid from a reaction mixture if mixing a Grignard reagent phenylmagnesium bromide with dry ice (CO2) in ether? Thanks!

*October 22, 2010*

**Chemistry**

17.606gNa2CO3(mol Na2CO3/106gNa2CO3)*(2molNa/molNa2CO3)* (23gNa/molNa)= 7.64gNa

*October 22, 2010*

**Chemistry**

Which of the following elements has an ionic radius greater than its atomic radius a) Ca c) Fe b) Li d) N

*October 21, 2010*

**government**

Who can impose the draft and under what circumstances?

*October 21, 2010*

**Spanish**

El alumno o el profesor? complete each sentence with the appropriate word. 1. En una escuela americana "A" es una nota ________ y "f" es una nota ________. 2. El profesor_________; el alumno ________ la pizarra. i think number 1 is buena & mala but im not ...

*October 19, 2010*

**english**

Define sentence variety and rhythm in your own words and explain how they interact in effective writing

*October 18, 2010*

**english**

By adding sentence variety in writing you can give it life and rhythm. Your readers can be bored by reading too many sentences with the same structure and length. It can grow to be monotonous for readers.

*October 18, 2010*

**Chemistry**

so that means the ion is smaller because your removing the 2 outside electrons ?

*October 17, 2010*

**Chemistry**

Which has a larger radius, Mg or Mg+2? Explain why. Thanks ! I think its Mg+2 but im not sure why.

*October 17, 2010*

**chemistry**

write a balanced chemical reaction for the reaction of aqueous magnesium chloride with aqueous potassium phosphate to form solid magnesium phosphate (Mg3(PO4)2) and aqueous potassium chloride (KCl). Indicate the physical states of the reactants and products

*October 15, 2010*

**chemistry**

Write a balanced chemical reaction to show the dissociation of solid magnesium chloride (MgCl2) in water, indicate states of the reactants and products

*October 15, 2010*

**Probability - CHECK ANSWERS**

Thanks a bunch!

*October 15, 2010*

**Probability - CHECK ANSWERS**

I have an eight pack of crayons. Colors red, green, blue, orange, black, gray, pink, and purple. What is the probability of choosing the green crayon? 12.5 percent What is the probability of choosing the red, blue, or gray crayon? 37.5 percent What is the probability of not ...

*October 15, 2010*

**math**

suppose both pairs of opposite sides of a quadrilateral are parallel. Which angles of the quadrilateral must be supplementary?

*October 14, 2010*

**5th grade**

What do you think 24*3.7 is ???

*October 14, 2010*

**geography**

What impact did the dissolution of the Union of Soviet Socialist Republics have?

*October 13, 2010*

**math**

Why is 24,005 greater than 8,999?

*October 11, 2010*

**Physics**

If i have ten grains of sand on a flat, 8x8 chessboard, randomly distributed, what is the probabilty that all ten are on the same square?

*October 8, 2010*

**Physics**

The sun has a raduis of 6.96*10^8m and a surface temperature of 5780K. How much power is radiating?

*October 8, 2010*

**Physics**

Consider 3 layers of a wall. The first layer is plaster 1.0 cm thick(R=0.033 SI units), the second layer is fiberglass insulation 8.9 cm thick (r=2.97), and the outside layer is woodd 3.0 cm thick(0.33). What is the heat loss through one square meter of wall if the inside ...

*October 8, 2010*

**science**

what reactants are added together to get copper nitrate!

*October 8, 2010*

**word problem**

Members of the Computer Club were assessed equal amounts to raise $1200 to buy some software. When 8 new members joined, the per-member assessment was reduced by $7.50. What was the new size of the club?

*October 8, 2010*

**word problem**

2. The excursion boat Holiday travels 35km upstream and then back again in 4h 48min. If the speed of the Holiday in still water is 15km/h, what is the speed of the current?

*October 8, 2010*

**word problem**

1. During 60mi of city driving, Jenna averaged 15mi/gal. She then drove 140mi on an expressway and averaged 25mi/gal for the entire 200mi. Find the average fuel consumption on the expressway.

*October 8, 2010*

**Algebra 2**

1. During 60mi of city driving, Jenna averaged 15mi/gal. She then drove 140mi on an expressway and averaged 25mi/gal for the entire 200mi. Find the average fuel consumption on the expressway. 2. The excursion boat Holiday travels 35km upstream and then back again in 4h 48min. ...

*October 7, 2010*

**Home work for Gym**

Thank You soo much!! ;D

*October 7, 2010*

**Home work for Gym**

To join a gym, your friend pays a one-time fee of $75 and $45 per month for the duration of the membership. Your friend has paid a total of $345. How long has your friend been a member of the gym? HELP ME1 :D

*October 7, 2010*

**Math; Pre- Algebra**

Please help me !! :0

*October 7, 2010*

**Math; Pre- Algebra**

Problem: -5k - 19 = 5 - 13k Solve for k. -15n = 16 = 86 - 29n Solve for n.

*October 7, 2010*

**Math; Pre- Algebra**

I neede help with how to solve equations with variabls on both sides. Can you give me some examples and work them out step by step?? Please!! :D

*October 7, 2010*

**geometry**

M is the midpont ST what is the reason?

*October 7, 2010*

**medicine**

The dermatologist is having you prepare a dog for a skin allergy test. Forty antigens need to be tested and each antigen must be 1 cm from the next. What size patch should you shave on the dog (assume that you are shaving a square)

*October 7, 2010*

**algebra)**

8 divided by 8 =1

*October 5, 2010*

**social studies**

what does bias mean?

*October 5, 2010*

**physics**

A .15kg ball is dropped from a height of 14 m to the ground below, and hits the ground with a speed of 12 m/s. With what speed would the ball have hit the ground if there were no air resistance? How much work does the air resistance do on the ball?

*October 4, 2010*

**math**

Put in simplest form: 16x^7y^12-10X^5y^8/2x^2y^9

*October 4, 2010*

**Chemistry**

Use de Broglie's relationship to determine the wavelength of carbon atom moving at 2.3 x 10^5 m/s.(Hint: First determine the mass in kg of one move of carbon atoms)

*October 3, 2010*

**biology**

k so the answer would b 22 degrees????

*October 3, 2010*

**biology**

the index of refraction of h2o is 1.33. find the angle of refraction of a beam of light in air hitting the h2o surface at an angle of 60 degrees n(air)=1.00

*October 3, 2010*

**Organic Chemistry**

Design a flowchart for the separation of a mixture that contains toluic acid, p-bromo-aniline, and anthracene. Whenever a reaction occurs, write the reaction completely.

*October 3, 2010*

**Math**

To find the x-intercept, let y=0 and solve for x. Therefore, 0=2x-1 ---> x=1/2 To find the y-intercept, let x=0 instead. y=2(0)-1 ---> y=-1 From here, you plot the points (1/2,0) and (0,-1) on the graph.

*October 2, 2010*

**Chemistry**

12545

*September 29, 2010*

**read and write**

Meaning: Without emotion; in a stoic manner

*September 28, 2010*

**MATH**

sorry for all the dots they werent nessary but thats how it shows in my math book

*September 28, 2010*

**MATH**

1 6x+7=25;3 2 22-5c=8;3 3 b\4-7=1;36 4 7a+4_>20;2.7 ps. the arrow is suppose to be on top of the line. 5 4y-3.12;4 6 m\3+14<33;9 I NEED THE ANSWERS PLEASE CAN ANYBODY HELP ME FAST .

*September 28, 2010*

**math**

thats my cousin keila and we both in 9th grade and need help but me and her have diffrent questions ?

*September 28, 2010*

**MATH **

huh?

*September 28, 2010*

**math**

the sum of 7 and three a number b is at least 12 ?

*September 28, 2010*

**college chemistry**

Please identify the net ionic equation for Na3PO4 +ZnSO4=Zn3(PO4)2+ Na2SO4

*September 27, 2010*

**medicine**

A cat with a gastrotomy tube must receive 300 kcal daily. A 15 oz can of food has 1500 kcal. The food must be diluted with water 50:50 so that it is thin enough to fit through the tube. A maximum amount of 45 ml can be given at each feeding. How many feedings does the cat need...

*September 23, 2010*

**medicine**

50 ml of a solution of 50% dextrose is added to a liter of 0.45% NaCl with 2.5% dextrose to yield a solution with a final dextrose concentration of what percent

*September 23, 2010*

**Critical Reading**

metaphore for obstacles

*September 23, 2010*