# Questions Asked onMarch 15, 2010

1. ## 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?

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

Why are coefficients used in mole ratios instead of subscripts

4. ## chemistry

how to write the oxidation number for CL4

5. ## 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

6. ## 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?

7. ## 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?

8. ## Grammar

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

9. ## chemistry

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

10. ## chemistry

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

11. ## personal finance

Which of the following would increase the amount that a person could afford to spend on a home? a)increased family income b)increased interest rates c)decreased down payment d)high montly living expenses IS A CORRECT ANSWER?THANK YOU:))))

12. ## 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

13. ## 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

14. ## Chemistry

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

15. ## 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

16. ## Organic Chemistry

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

17. ## 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

18. ## physics

What is the minimum downward force on the box in the figure that will keep it from slipping? The coefficients of static and kinetic friction between the box and the floor are 0.30 and 0.20, respectively.

19. ## chemistry

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

20. ## physics

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

21. ## Chemistry

Problem: In a first order decomposition reaction, 50% of a compound decomposes in 10.5 minutes. What is the rate constant of the reaction? The solution my professor gave says: k = .693 / 10.5min Where did the .693 come from? Thanks

22. ## 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?

23. ## math

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

24. ## PRE CAL. JOURNAL

A BAG CONTAINS 3 RED CHIPS, 2 BLUE CHIPS AND 1 WHITE CHIP. IF 2 CHIPS ARE CHOSEN FROM THE BAG WITHOUT REPLACEMENT DETERMINE THE PROBABILITY THAT THEY ARE OF DIFFERENT COLORS

25. ## math

It takes Tammy 45 minutes to ride her bike 5 miles. At this rate, how long will it take her to ride 8 miles?

26. ## Trigonometry

a satellite camera takes a rectangular - shaped picture. the smallest region that can be photographed is a 4 - km by 6 - km rectangle. as the camera zooms out, the length l and width w of the rectangle increase at a rate of 3km/sec. how long does it take

27. ## 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!!!!!

28. ## word problem

A manufacturer of graphing calculators has determined that 11,000 calculators per week will be sold at a price of $90 each. At a price of$80, it is estimated that 17,000 calculators would be sold. A.) determine a linear function that will predict the

29. ## marketing

Alex is developing the marketing strategy for a brand of men's clothing. Before he develops his strategy, Alex will conduct research to better understand his customers. Briefly describe a conceptual model that includes the factors he should consider in his

30. ## 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

34. ## 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.

35. ## Math

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

36. ## chemistry

The figure below represents the bulls eye target for an archer. The black dots represent where the archer’s arrows hit: How can this archer be described? a. accurate b. precise c. accurate and precise d. neither accurate nor precise

37. ## 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?

38. ## 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.

39. ## 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

40. ## Thermodynamics

A rigid insulated closed tank consists of two compartments of equal volume separated by a valve. Initially one contains air at 145 psia and temperature of 130 F, while second is completely empty(vaccum). the valve is opened and remains so until both are in

41. ## physics

Posted by norm on Monday, March 15, 2010 at 9:21am. What is the minimum downward force on the box in the figure that will keep it from slipping? The coefficients of static and kinetic friction between the box and the floor are 0.30 and 0.20, respectively.

42. ## 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?

43. ## chemistry

Nitroglycerine decomposes according the the equation: 4C3H5(NO3)3 -> 12 CO2 + 10 H2O +6N2 + O2. 15.0 g of nitroglycerine is placed in a 500 ml flask at 25.0 C. The vapor pressure of water at this temperature is 23.8 mmhg. Find the total pressure in the

44. ## 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?

45. ## math

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

46. ## 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

47. ## Chemistry

Suppose that we had used 25.5cm3 of 0.200M NaOH and 42cm3 of dilute HCl to reach the end point. What is the molarity of the Hcl acid? HCl = NaOh--> NaCl + H20

48. ## 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?

49. ## algebra

Television sets: What does it mean to refer to a 20-inch TV set or a 25-inch TV set. Such units refer to the diagonal of the screen. A 25-inch TV set also has a width of 20-inches. What is its height? Height of a 25-inch TV. _______inches

50. ## health

The joined cells, now called a blastocyst, move toward and attach to the mother's uterine lining. How long does this take?

51. ## algebra 2

A bag contains 4 white marbles, 3 red marbles, 2 green marbles, and 1 yellow marble. what is the probability of reaching in the bag and randomly choosing a white marble?

52. ## physics

1.An elastic cord is 5.0m long and 1.0cm in diameter and acts as a spring with spring constant 70 N/m, what is the young's modulus for this material? 2.A heavy uniform beam of mass 8000 kg and length 2.0m is suspended at one end by a nylon rope of diameter

85. ## ethics

o According to research and news reports within the past 2 years, what are some of the changes the United States has made to policies concerning the treatment of Muslim and Arabic members of society? CAN SOMEONE POINT ME IN THE RIGHT DIRECTION TO START MY

86. ## algebra

Simplify the complex fraction m^-1+z^-1/m^-1-z^-1

87. ## Physics

Gold ions (Au+) are accelerate to high speeds using electric fields. These ions are then passed through a region where uniform electric E and magnetic B fields are present. If the ions are traveling to the right, which configuration of E and B will serve

88. ## Physics

An electron and a proton execute uniform circular motion in the presence of a uniform magnetic field. If the radius of the circle is the same for both particles, which of the following statements is true? a. Both particles move in the same direction; the

89. ## Geometry

I'm not asking for the answer (I hate when people do that) I'd just like to know how to go about this so that I may understand. Any help is much appreciated. "A sphere of ice cream is placed onto your ice cream cone. Both have a diameter of __ cm. The

To cause a commotion that could ruin a plan: rock_ _ _ _ _ _ _

91. ## Gen 200

Prepare a 700 to 1,050-word paper in which you explain the relationship among professional values, ethics, and career success. Address the following items in your explanation: Define values and ethics. Identify at least three sources of professional values

92. ## physics

1. If a steel rope and a nylon rope of equal lengths are to stretch by equal amounts when subjected to equal tensions, what must be the ratio of their distances? 2.A simple hand operated hydraulic press can generate a pressure of 6.0 X 10^9 N/m^2 . If the

93. ## college math

find the range of the function defined by the equation and the given domain. f(x)=3/x-6; D={-3,0,3,9}

94. ## american history

what countries fought with us in world war 1?

96. ## Math

Give a verbal, visual, numerical, and graphic representation for the idea one and one-sixth.

97. ## ECONOMICS

WHAY IS GLOBAL ECONOMIC CRISIS?

98. ## math

how do you make four 8s into 640??

99. ## Chem

Suggest two experimental errors which would result in too low a value for the acid EW. Explain how these errors result in a low value.

100. ## 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

101. ## English

How dow the characters in a traditional fairy-tale differ to those in the princess bride.

102. ## Exploring Space

rocket engines which work in space still need oxygen 4 the fuel to bur. space is a vacuum. where does the oxygen come from? I'm stumped on this, can someone please lend me help, thanks

103. ## math

A Boeing 747 jet takes off from Boston's Logan Airport, which is at sea level, and climbs to a cruising altitude of 27,000 ft at a constant rate of 1400ft/min. A.) write a linear equation for the height of the plane in terms of the time after takeoff. B.)

104. ## Chemistry

What is the structure of a tripeptide where glycine is first, serine is second, and alanine is third.

105. ## u.s. civics

A court of justice.

106. ## Biology

What biological impacts are we seeing as a result of the use of fossil fuels? I still can't figure this out, even after googling it. What's the difference between a biological impact and an environmental impact? -MC

107. ## 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?

108. ## math

a plastic cube has 6 different faces. each face is painted either orange, yellow or green. the cube is rolled 36 times, and the results are: orange is 12, yellow is 6, and green is 18. how many faces of the plastic cube would you expect to be painted

1)(1-cos^2x)(csc x) ? Is this equal to sec x? 2) Expand: log7 3 sqrt x / x^2y 3) Find and simplify: f(g) F(x) = x^2 + 2x g(x) = 2x x^2 + 2x(2x) = x^2 + 4x Is this correct?

110. ## Chemistry

How do you balance Al(OH)3 --> Al2O3 + H2O Why does the OH decompose into O3 and H2O??

111. ## trig

how do you simplify "[sin(x)+tan(x)]/[1+sec(X)]"

112. ## College Chemistry Lab

The absorbance of a 9.25x10^-8M solution of a fabric dye was measured to be 0.835 at a particular wavelength. What would the absorbance be for a 4.65x10^-8M solution of the same dye under identical conditions?

113. ## 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

114. ## trig

how do you find all the solutions when cos x = .75

115. ## 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

116. ## 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.

117. ## 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

118. ## English

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

119. ## Exploring Space

what wud hold the cable of a space elevator up? Would it be earth's gravity holding the cable of a space elevator up?

120. ## chemistry

How many grams of CH4 are needed to react with 160.0 grams of Br2

121. ## 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

122. ## trig

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

123. ## 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

124. ## Math

A delicatessen serves 13 kinds of sandwiches and 5 kinds of chips. How many different sandwich and chip lunches can they make if each lunch has one sandwich and one bag of chips? A) 13 B) 1 C) 65 D) 18

125. ## Literacy

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

126. ## 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

127. ## chemistry

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

128. ## Chemistry

Write the balanced chemical equation for the equilibrium that is taking place between acetic acid and sodium acetate in the buffer solution.

129. ## 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

130. ## Physics

The frequency of circular motion for a charged particle moving around in the presence of a uniform magnetic field does not depend on ... The radius of the circle The mass of the particle The charge of the particle The magnitude of the magnetic field

131. ## math

if a whole number less than 10 is choosen at random, what are the odds that the number is greater than 5?

132. ## Math-Rational #'s

Just trying to understand this. Please let me know if I did these right. Thanks!!! -7 as a rational # = -7/10 -3.03 as a rational # = -33/10 -2 3/12 as a rational # = -25/12 1.03 as a rational # = 13/10

133. ## Calculus

In calculus, the sum of an infinite geometric series whose first term is 1/20 is given by the complex fraction 1/20 _____ 1-r where r is the common ratio between the terms. Simplify this expression.

134. ## chemistry

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

135. ## 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

136. ## English

Could someone please clarify this sentence for me, thanks. I ain't so sure I wasn't better off in the old days.

137. ## maths

solve the following simultaneous linear equation: -5x+6y=44 9x+7y=-8

138. ## language arts

Fill in the blank: The president will _______ well- deserved honors on the retiring ambassador.

139. ## 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

140. ## Math

I have more i don't understand?? Use the distributive property of multiplication over addition to rewrite the sum as a product of two factors, where one of the factors is a sum. 14) 6yz - 54y A) 6y(z - 9) B) 6y(z - 54) C) 6y(z + 9) D) 9y(z - 6) explain

185. ## 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

186. ## English

Thank you for your suggestion. I just wanted to be sure that I paraphrased the following 4 sentences correctly. I really hope you can have a look at them. 1) Mr Utterson heard his steps approaching (or getting closer?) as Mr Hyde was turning the end

187. ## math

a triangle b means (10*a) + b. for an example,5 triangles 4= (10*5)=50+4 =54.find the value of8 triangle 1.

188. ## spanish

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

189. ## Math 61

solve step by step 2/3y=12

190. ## social studies

1. Influence of sensory programs on people with an intellectual disability.

191. ## Literature

What influences the mood and tone of the play [in Romeo and Juliet]?

192. ## Biology Honours

what's another purpose of staining bacteria besides it being a help to identify groups of bacteria? why are cells counter-stained with safranin?

193. ## trig

find in degrees the value of Ө in the interval O¡ÜӨ¡Ü 360 for which 2cos^2Ө-cosӨ-1=sin^2Ө give your answers to 1 decimal place where appropriate

194. ## 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

195. ## science

what is mant by fuel

196. ## geometry

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

197. ## Exploring Space

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

198. ## Algebra

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

199. ## 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

200. ## English

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

201. ## chemistry

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

202. ## computer

Most computer systems are set up to automatically first check which drive for the booting program

203. ## marketing

21) ______________ is the process of naming broad product-markets and then segmenting these broad product-markets in order to select target markets and develop suitable marketing mixes. A. Diversification B. Market positioning C. Market segmentation D.

204. ## Math

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

what is the position of the diaphram when you make it inhale and exhale?

206. ## 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

207. ## social studies

who wrote the senecafalls declaration? when and why

208. ## math

a plastic cube has 6 different faces. each face is painted either orange, yellow or green. the cube is rolled 36 times, and the results are: orange is 12, yellow is 6, and green is 18. how many faces of the plastic cube would you expect to be painted

bycycle is to gear as car is to_______

210. ## Physics

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

211. ## 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?

212. ## 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

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

214. ## math

how many times would a bicycle wheel with a radius of 36cm rotate in 2km?

215. ## science

7) - An object accelerates (changes its speed) only if the forces acting on it in one direction are greater than the forces in the opposite direction, All of the following objects will accelerate EXCEPT? A) a ball striking a wall, in which the force of the

how to start a comparative genra essay

217. ## english

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

218. ## physical education

what is the difference between pileades and yoga