# Questions Asked onMarch 15, 2010

1. ## chemistry

Why are coefficients used in mole ratios instead of subscripts

2. ## Physics

A light beam strikes a piece of glass at a 60.00° incident angle. The beam contains two wavelengths, 450.0 nm and 700.1 nm, for which the index of refraction of the glass is 1.4824 and 1.4750, respectively. What is the angle between the two refracted

3. ## chemistry

how to write the oxidation number for CL4

4. ## Grammar

Two households, both alike in dignity. what is the prologue's first prepositional phrase?

5. ## Physics

After a tornado, a 0.55g straw was found embedded 2.3cm into the trunk of a tree. if the average force excerted on the straw by the tree was 65N, what was the speed of the straw when it hit the tree?

6. ## Physics

A small, nonconducting ball of mass m=1.0mg and charge q=2.0*10^-8 C (distributed uniformly through it's volume) hangs from an insulated thread that makes an angle theta = 30 degrees with the vertical, uniformly charged nonconducting sheet. considering the

7. ## Biology

'We are currently in an energy crisis. After food, fossil fuels are humanity's most important source of energy. These resources take millions of years to make. We are currently using the fuels that were made more than 300 million years ago, before the time

8. ## English lit

I need to write a explication about this poem, can you help? A poem comes straight from inside the heart A poet with his own poem he will never part A poet feels and can see what others cannot see A poet can see beauty in bees and the fruitful pure tree A

9. ## Physics

An ice cube is placed in a microwave oven. Suppose the oven delivers 105 W, of power to the ice cube and that it takes 32,200 J to melt it. how long does it take for the ice cube to melt?

10. ## Chemistry

how much CuSO4.5H2O is required to prepare 100 ml of a .050M aqueous stock solution?

11. ## chemistry

How do I write the skeleton equation representing the heating o f magnesium carbonate to produce solid magnesium oxide and carbon dioxide gas?

12. ## Organic Chemistry

why was it possible to separate the product from sodium hydroxide using acetone?

13. ## chemistry

How do you balance this equation? Zn(s) + HNO3(aq)--> Zn(NO3)2(aq) + N2O(g) + H2O(l)

14. ## Yoku

A prism has total surface area of 360 m2 and volume of 60 m3. If the length, width, and height are reduced to half their original sizes, what will be the following?

15. ## probability

consider the experiment of selecting a card from an ordinary deck of 52 playing cards and determine the probability of the stated event. A card that is not a king and not a spade is drawn. I know there are 52 cards in a deck and there are 4 kings to a

16. ## Pysics

A small motor runs a lift that raises aload of bricks weighing 836N to a height of 10.7m in 23.2s. assuming that the bricks are lifted with constant speed, what is the minimum power the motor must produce?

17. ## chemistry

assuming x=1, how much CuSO4.5H20 would you need to prepare 6 grams of copper ammine complex?

18. ## Economics

Bridget has a limited income and consumes only wine and cheese; her current consumption choice is four bottles of wine and 10 pounds of cheese. The price of wine is $10 per bottle, and the price of cheese is$4 per pound. The last bottle of wine added 50

19. ## physics

a atapult launcher on an aircraft carrier accelerates a jet from rest to 72m/s. The work done catapult during the launch is 7.6 x 10 to the 7th J. a)What is the mass of the jet? b) If the jet is in contact with the catapult for 2s, what is the power output

20. ## social studies

Create a timeline tracking the major themes shifts in american history from the developement of sectionalism in the early 1900s. Im just asking for help and a site to help me come up with the information for my timeline. Please Help!!!!!

21. ## Environmental Science

Research Paper I need to write a research paper on coral reefs. i need to compose a research paper that deals with coral reefs and addresses enough of the questions below in order to meet the minimum page requirements for the paper (3-4 double spaced

22. ## Environmental Science

34. In two or three well-developed paragraphs, list four federal laws that relate to mining and reclaiming mined land, and state examples of provisions of each. Can I please get some help on this question? Thank you.

23. ## College CHem

Suppose you accidently add too much NaOH during a titration. You then add a volume of HCl exactly equal to ½ the volume of NaOH actually used in the titration. What effect does this have on the Ka?

24. ## Physics

Two current carrying wires cross at right angles as indicated in the figure. If the wires are not restrained, what statement best describes the motion of the wires? Hint: To help you visualize the situation, draw first the magnetic field that Wire 1 makes

25. ## physics

How much force does an 71 {\rm kg} astronaut exert on his chair while sitting at rest on the launch pad? Express your answer using two significant figures.

31. ## physics

(a)At a certain instant, a particle-like object is acted on by a force F = (4.0 N)i - (2.0 N)j + (9.0 N)k while the object's velocity is v = - (2.0 m/s)i + (4.0 m/s)k . What is the instantaneous rate at which the force does work on the object? (b)At some

32. ## chemistry

What is the boiling point of the water in your radiator if 2.00kg of antifreeze (ethylene glycol, C2H6O2) is added to 9.00x10^3 grams of water?

What does is mean that "emissions trading has propertitized pollution"?

34. ## physics

What is the kinetic energy of a 62kg cyclist if she is moving on her bicycle at 8.2 m/s?

35. ## math

If y varies inversely as x,find the inverse variation equation for the situation y=65 when x=9

36. ## math

Write the following statement in if - then form. David will sing provided Eric plays the piano. i don't get get this

37. ## Physics

A beam of light is emitted in a pool of water from a depth of 61.5 cm. How far away, relative to the spot directly above it, must it strike the air-water interface in order that the light does not exit the water?

124. ## english

critical essay on phenomenal woman

125. ## math

Last week we needed 30 chairs for the meeting. This week we need 200% of what number. I think the answer is 1.2

126. ## finance

Why should the notes that are incorporated into the Financial Statements data should provide anyone with enough information to accurately assess the impact of the change, either positive or negative?

127. ## chemistry

What mass iron(III) oxide could be produced from 8.2 mol of oxygen gas in the synthesis of iron(III)?(Balanced equation)

128. ## Algebra

How can you find log base 3 of 242/5 using the given information without a calculator? log base 3 of 10 = 2.1 log base 3 of 11 = 2.2 log base 3 of 4 = 1.3

129. ## math

a worker in a city park needs to cover a circular path around the outside of a flower garden with gravel. the radius of the garden is 15 feet and the path surrounding the garden is 6 feet wide. how many square feet need to be covered with gravel? explain

130. ## Algebra 3

(x-2)/(x+2)=(3)/(x)

131. ## algebra 3

find domain: f(x)=sqrt of 100-x^2 f(x)=sqrt of 2x^2+6x-8

132. ## Chemistry for Bob

Do you mind posting up an example for that please? It would help out a out: What is the activation energy for a reaction whose rate tripled when temperature rose from 28 to 53C.

133. ## English

I made a few more changes. Let's hope everything is fine this time. Thank you. 1) Mr Utterson decides to look for Mr.Hyde. At last, Mr. Hyde appears. Utterson hears his steps approaching the end of the street. 2) He is a small, plainly dressed man and his

134. ## English

When can you start a sentence with and or but? Can I get some examples? Thanks -MC

135. ## Exploring Space

Why do astronauts appear to float when they aboard the ISS station and experience 90% of earth's gravitational pull? Is it because of the freefall?

136. ## English

Hey, i am not doing good in my English 102 class, my professor says i address my writing prompt in the wrong direction. So i was hoping if someone can help break down my writing prompt, and give me a direction to write my essay. Writing Prompt: The

137. ## chemistry

the form of the conversion factor that is used is the one in which the unit of the_ is in the denominator

138. ## Physics

GSM networks use microwaves of 20 cm in wavelength. The energy carried by one trillion (1012) photons of this wavelength is closest to ... a. 10^-16 Joules b. 10^-15 Joules c. 10^-14 Joules d. 10^-13 Joules e. 10^-12 Joules

139. ## spanish

In Spain, all hotels are new and modern buildings? True or false.

140. ## health

How do culture and health beliefs affect the spread of emerging disease? Can someone help me with specific examples?

141. ## Math

how do i factor this? 2x^3+4x^2+2x

142. ## English

1. Each one of us has his room. 2. Each of us has his room. 3. We each have our room. 4. We each have our rooms. (Are they all the same? Which one is correct #3 or #4?)

143. ## chemistry

If 23.5 grams of iron chloride are produced how many grams of iron did you start with?

144. ## English

1. Cut out all the pieces. (Does 'out' mean 'completely' here?) 2. Shine a light on the back of the stage. 3. Shine a light at the back of the stage. 4. Shine a light in back of the stage. 5. Shine a light in the back of the stage. (Which one is right? Do

145. ## math

if the median to the hypotenuse of a right triangle measures 25 and a leg 14, find the measure of the other leg

146. ## english

hello :) I wrote a story with preterit in that story the man talks of what happened 10 years before (It's a bet, he should be ruined finally when the other man finished his bet , he waives the money) what are the tenses which I have to use? so please help

147. ## Algebra

The formula b=26a is used in New England to estimate the minimum furnace output, b, in BTU's, for a modern house with a square feet of flooring. What is the minimum furnace output? what is a? HOW DO I FIND THESE QUESTIONS OUT?

148. ## Math

Find the number of subsets of the given set. 4) {mom, dad, son, daughter} a. 16 b.14 c.12 d. 8

149. ## English

1. He retired from baseball in 1999. 2. He retired from a baseball player in 1999. 3. He retired from his job in 1999. 4. He retired from throwing balls in 1999. (Are they alll grammatical?) 5. He was born in Flint, Michigan, America. 6. He was born in

150. ## Thermo

one more question: a worker cleans a railroad car with steam of 15000ft^3 car on inside, t=240F P=14.7psia of steam. the car is closed. the steam inside cools until P=12 psia, at which time salad oil is added to tank. find a. heat transfer from steam

151. ## health

Why were human births historically so dangerous, particularly before C-sections were possible?

152. ## critical thinking

what are the fallacies in 5. Letter to the editor: “I strongly object to the proposed sale of alcoholic beverages at County Golf Course. The idea of allowing people to drink wherever and whenever they please is positively disgraceful and can only lead to

bycycle is to gear as car is to_______

154. ## trig

combine fractions and simplify to a multiple of a power of a basic trig. function.? sin x/cot²x - sin x/cos²x

155. ## chem

why does the temperature decrease as the internal energy of a system decrease?

156. ## math

____% of 87.56 ounces is 22.6 ounces. i have to round to the nearest tenth of a percent. i think the answer is 64.96

157. ## Science

1. Temperature cools about 6.5 degrees Celsius per kilometer of _______. 2. ___________ from 10 km to 50 km about Earth, this layer contains ozone that absorbs much of the Sun's ultraviolet radiation. It contains most clouds and ____________. 3. _______

158. ## apCHEMistry

"What is the range for the color change of phenolphthalein?" thnk you very much

159. ## Chemistry

The standard electrode potentials for three electrode systems are: Ti^3+(aq) + e^- --> Ti^2+ E= -0.37 Fe^3+ ---> Fe^2+(aq) E= +0.77 Ce^4(aq) + e^- ---> Ce^3+(aq) E= +1.45 Using the data above, deduce which species is the best reducing agent, giving a

160. ## College Chemistry Lab

The absorbance of a 6.3x10^-5M solution of an iron complex was measured to be 0.328 at the optimum wavelength. A second solution of the iron complex has an absorbance of 0.833 measured under identical conditions. What is the molarity of the complex in the

161. ## Object Orientation

Use your own words to describe or Explain the 4 basic principles of Object Orientation. ( Abstraction, Encapsulation, Modularity, and Hierarchy) Thanks for the help

162. ## chemistry

What is the activation energy for a reaction whose rate is tripled by a temperature increase from 28 to 53 C? I understand that I have to use the arrhenius equation, but how do I set it up for a problem like this?

163. ## Polish School

hey I need help. Can you finish this sentance, using one of these words? Words powstanie niepodleg³oœci rosyjskim emigracji 1863 Sentance: W XIX wieku Polacy podejmowali próby odzyskania... Thanks!

164. ## English

I found it difficult to rephrase a few sentences taken from Stevenson's D Jekyll and Mr Hyde. I included them into inverted commas. i really hope you can help me clarify their meanings. 1) Utterson decided to look for Mr.Hyde. As he was waiting for him at

201. ## Physics

What would be the physical features of a simplified axon? and how would it differ from a natural axon?

202. ## Algebra

41-(2x+4)< or + to 2(x+1)+x Use set-builder notation to describe the complete solution. {x/x__ __}

203. ## AP USH

true of false? When the United States refused to hand over the Philippines to Filipino rebels, a vicious guerilla war with racial overtones broke out between the former allies?

204. ## Pre-Cal

1)find f(g(x)) f(x) = x^2 + 2x g(x) = 1/x x^3 + 2x Is this correct? 2) solve: 3^x-1 = 10 ln 3/ ln 10 = .264 Is this correct? I am not sure how to do these. 3) Solve: 3^x+2 - 4 = 12

radio 5 to 3 how many of each one totals 4000?

Name of U. S. Supreme Court Justice who had the longest tenure on the Court:

207. ## Literacy

Which graphic organizer is best to use when teaching literacy?Justify your choice

208. ## social studies

I know that their are many ways to say hello in japanese, but I need to know how you write hello in japanese. Please give me and answer.

209. ## science

what is mant by fuel

210. ## geometry

i need help really fast on doing, a stage five 'Ice Triangle'.....or itteration .. thank's

how to start a comparative genra essay

212. ## Exploring Space

What force musst be overcome to a launch a vehicle into space? Would that force be weight?

213. ## Algebra

Need to know how to find x. -x/3 = 1/8 can anyone help?

214. ## english

now i need a sentence that goes in this exact order, adverb, verb, pronoun, adverb.

215. ## math

11 g = ________ mg explain why

216. ## Exploring Space

if a satellite were to be launched with too little speed or too much speed then what would happen? If a sattellite were to be launched with too much speed then the friction in the air would make it heat up to the point where it would burn up. Earth's

217. ## English

i need a sentences. one with a pronoun then conjuction, pronoun, helping verb, verb, prep, pronoun.

218. ## chemistry

what happens when sulphate ions are added to hydrochloric acid and then heated?