# Questions Asked onJanuary 20, 2009

1. ## Physics

Four identical masses of 800kg each are placed at the corners of a square whose side length is 10.0cm. What is the net gravitational force (magnitude and direction) on one of the masses, due to the other three? I think I have to separate the four masses

2. ## physics

Calculate the speed at the edge of a disc of radius 8.5 cm that rotates at the rate of 4 rev/s. Answer should be in units of m/s Thanks

3. ## chemistry

Ca(s) + Br2(l) --> CaBr2 is synthesis my teacher also said that the cause of the reaction is stable electron configuration is that the same thing as the electrolytes one

4. ## global

What did ancient Hebrews need to do to please their god?

5. ## geometry

If you had two triangles, triangle RST and triangle UVW, and in triangle RST angle R= angle S= angle T and in triangle UVW angle U= angle V= angle W, is there enough information to prove that the triangles are congruent? So each triangle is equiangular.

Find the length of the 3rd side of each right triangle. 1. 8^2+15^2=c^2 Answer: c=17 2. 5^2+b^2=13^2 Answer: b=12 3. 9^2+13^2=c^2 Answer: c~15.81 Simplify. Assume that all variables are nonnegative. { this means square root 4. {12 Answer: 2{3 5. 2{75

7. ## physics

A 72 g baseball rolls off a 1.5 m high table and strikes the floor a distance of .8 m away from table. How fast is it rolling on the table before it fell off?? Accel of gravity is 9.81 m/s2.

8. ## trig

(cotxsec2x - cotx)/ (sinxtanx + cosx) = sinx prove. i keep getting (if i start from the left side) = cosx instead of sinx please help!

9. ## spelling

take 5 words and make a sentence out of it lets, school, out, at, for, four, let's Thanks

How do you calculate the thermal amplitude

11. ## Chemistry

A 12.7 L sample of gas is under a pressure of 740 mm Hg at 20degrees C. What will be the volume of the gas if the pressure increases to 1.00 atm and the temperature drops to 0 degrees C

12. ## physics

A wheel of diameter 0.700 meters rolls without slipping. A point on the top of the wheel moves with a tangential speed of 2.00 m/s with respect to the ground. 1. If the wheel suddenly stops spinning and skis along the ground then a. v=rù b. v>rù c. v

13. ## chem

quantitative determination of acetylsalicylic acid in aspirin tablets by back titration 1)why do we use a more dilute NaOH solution for the standardization of NaOH? 2)what is the rationale behind the dilution and aliquoting of the aspirin sample? 3)what

14. ## 2nd grade math requestion post

Okay, my child is doing problem solving lesson 5-7 in scott foresman addison wesley book. The question that we are having a problem with is a number line. there are 10 spaces in the number line and the clues are: Clue 1: the number are between 70 and 82

16. ## social studies

how does the presence of top carnivores indicate that an ecosystem is healthy

17. ## science

Explain what would happen to the animals and plants in a saltwater ecosystem if it were flooded by fresh water?

18. ## Pre-calculus

Find the interquartile range and the semi-interquartile range of the following data: 42 51 53 53 59 61 75 100 mean=61.75=62 median=56 mode=53 interquartile range=87.5-52=35.5?

19. ## Math

Prove the identity. sin² θ = tan² θ / 1 + tan² θ

20. ## writing sentences and paragraphs

you've applied for a specific job in your field of study .The human resources department arranges an interview and tells you to bring a polished piece of writing for them to evaluate your writing skills

21. ## Pre-calculus

Find the first three iterates of the function f(x)=x^2-2, if the intial value is -2. z(0)=-2 z(1)=(-2)^2-2 or 4-2=2 z(2)=(2)^2-2 or 4-2=2 z(3)=(2)^2-2 or 4-2=2 Answer: z(1)=2, z(2)=2, z(3)=2

22. ## Chemistry

Explain why the alcohol level in a thermometer rises when it is placed in a warmer fluid (#step process)

23. ## Accounting

Classify the following Users of information as either: Internal User External User; trading partner External User; Stake holder 1) IRS 2) Inventory control manager 3) Board of Directors 4)Customers 5) Lending Institutions 6)SEC 7) Stockholders 8) CEO 9)

Assume the role of a small business owner. You have little funds to put into insurance and protection for your company. You have to decide where your extra funds will be stretched. Is it more important for you as a business owner to protect your business

25. ## Journalism

Ok, I am writing two articles for my journalism class. We write the newspaper. So my first article is about what type of dog Obama is going to get for the white house and his kids. I talk about the two breeds of dogs they are choosing and a little about

26. ## calculus

x^2 + y^2 = 25 3x + y = 15 Find the two points of intersection. I don't just want the answer, if you could tell me how to find it, it would save my life. The sqaure root is making it really hard for me to understand.

27. ## Human Geography (Religion)

So I have to do a project on the Cultural Interaction in Religion. My religion is Sikhism. Here are the questions I'm supposed to answer in my presentation: How does the religion impact other aspects of culture? How does this religious faith influence the

28. ## chemistry

Given the following reaction: 4 KO2 + 2 H2O + 4 CO2 ==> 4 KHCO3 + 3 O2 How many moles of O2 will be produced if 2.46 moles of CO2 react completely? moles

29. ## precalc

a 21-speed bike has varying top speeds dependent on the gear it's in. the bike's tire diameter is 26 inches. the bike can pedal at a maximum of 130 revolutions per minute. the front chain wheel has sprokets of 24, 32, and 40 teeth. the rear cassette

30. ## Chemisty

The relative electric charge of a proton is +1, the relative electric charge of an electron is -1 and that of neutron is 0. What is electric charge and why is it relative? Thank a lot.

31. ## college Accounting

Classify the following Users of information as either: Internal User External User; trading partner External User; Stake holder 1) IRS 2) Inventory control manager 3) Board of Directors 4)Customers 5) Lending Institutions 6)SEC 7) Stockholders 8) CEO 9)

32. ## college

1. Solve. 2x+3y+4z=2 5x-2y+3z=0 x-5y-2z=-4 A. (3, 4, 2) B. (-2 ,1, 2) C. (2, 2, -2) D. (1, 1, -2)

33. ## science

what would happen tp animals and plants in a saltwater ecosystem if it were flooded by fresh water?

34. ## physics

person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg. a. determine the force exterted on the

35. ## Pre-calculus

Find the quotient 3[cos5pi/12+isin5pi/12] divided by 6[cospi/12+isinpi/12]. Express the quotient in rectangular form. I worked it out as: 1/2[cospi/3+isinpi/3] =1/2(1/2+1/2i) =1/2+1/2i Is this right?

36. ## math

Customers of a phone company can choose between two service plans for long distance calls. The first plan has an \$18 one-time activation fee and charges 10 cents a minute. The second plan has no activation fee and charges 15 cents a minute. After how many

on the periodic table what has 4 neutrons and is a metallic

38. ## chemistry

NaCl + CuSO4 to write the product would i just do double replacement to get Na2SO4 + CuCl2 so the whole thing would be 2NaCl + CuSO4 --> Na2SO4 + CuCl2

39. ## Chemistry Lab

We did a lab where we reacted antacid with HCL and measured the pressure increase after the reaction. Then we found the percent concentrations of calcium carbonate of the antacid tablet. The question is: say the percent of calcium carbonate from trials 1 &

40. ## English

What is the possesive form of the word seashells

41. ## AED / ASAP PLEASE

this is my DQ 1: What are some factors that contribute to the disproportional representation of minority students in special education classes? Explain your answer. here is the scenerio and the question # 1 I need to answer:Riley Behler, a third-grade

42. ## english

Hi, can someone please revise my essay. I'd really appriciate any sugestions. There has been an ongoing controversy in Canada on whether the drinking age should be lowered to eighteen like most of the world (Russia, Argentina, Hong Kong, etc.) or if it

43. ## English

So I'm working on an english paper but I've been stuck the past hour on what to do. I'm trying to take my teachers advice by putting in an anaphorism (repeated words or phrases)but I'm having trouble. I'm repeating the phrase "eight months" but I'm stuck

44. ## physics

a person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg. a. determine the force exterted on the

alice folded a piece of paper into 12 equal squares and colored them. She had 3 times as many red parts as green parts and 2 more yellow parts than blue parts. How many parts did she have of eeach color?

46. ## Pre-calc, Algebra, Trig

(2x squared-3x +1)(4)(3x+2)cubed (3)+(3x +2)raised to the 4 (4x-3) Simplify

47. ## Chemistery

An aqueous solution of calcium chloride contains 2 g of calcium chloride (molar mass 110.98 g mol-1) in 100 ml. Calculate the concentration of chloride ion in the solution any help their

48. ## math

John is making a bookcase that is 72 3/8inches tall, he wants 5 equally spaced shelves. Eacg self is 3/8 inche thick. tell him where to drill the holes.

49. ## geometry

Mr. Rose wants to install wall-to-wall carpeting in his living room. The carpeting will cost \$15.50 per square yard, the padding will cost \$3.50 per square yard, and the installation is \$2.50 per square yard. What will it cost him to carpet the living room

50. ## science

I need a really cool unusual idea for my 5th grade science fair project - any ideas would be appreciated. Thank you,

51. ## U.S. History

Explain how the issues of "Gold, Glory and God" influenced not only the colonizing activities of Spain and England but also the economic gain and glory for all individuals involved.

52. ## math

a glass of ice tea cost two dollars. Refills cost 25 cents each. write the rule in function notation. is it F(x)=2+.25x? If it is wrong can you help

53. ## english

would the verb in this sentence be transitional or intransitional. if transitional, what would be the object? She threw a wonderful celebration.

54. ## Algebra

What is the length of the interval of solutions to the inequality 1 ( is less than or equal to) 3-4x (is less than or equal to) 9? I presume that I just plug in numbers for x? The problem is, that all the positive numbers I've tried have made them way less

55. ## algebra

Can anyone answer these? 3/12 + 3/4x 4/(x + 3) * 3x/8 4x/15 Ã· 12x/3 13/(4x) * 16/39 (3/2)x + (5/2) 9/(4xa) - 3/4

56. ## global history

what role did the king play in religion in ancient Isreal?

The relative mass of a proton is 1 and the relative mass of a neutron is 1. 1)Why do we use the term "relative mass" instead of mass? Is it because the mass of a proton is compared to the mass of a carbon-12 atom? 2) Can we say that the relative mass of an

58. ## math

How to solve this quadratic equation by factoring? 10x2 - 19x -15 = 0

59. ## Math

Solve 4sin^2x + 4(squareroot of 2)cosx -6 for all real values of x.

60. ## Point Slope Form Algebra

What is the difference between Y1=MX1+B and Y=MX+B

61. ## social help

How does major religion affect culture?

62. ## Math

I have two problemson polygonal convex sets which I do not understand. The first: Find the minimum value of f(x,y) = 2x-y+2 for the polygonal convex set determined by this system of inequalities: x is more than or equal to 1 x is less than or equal to 3 y

63. ## Chemistry Lab

We did a lab where we reacted antacid with HCL and measured the pressure increase after the reaction. Then we found the percent concentrations of calcium carbonate of the antacid tablet. The question is: say the percent of calcium carbonate from trials 1 &

64. ## precalc

a 21-speed bike has varying top speeds dependent on the gear it's in. the bike's tire diameter is 26 inches. the bike can pedal at a maximum of 130 revolutions per minute. the front chain wheel has sprokets of 24, 32, and 40 teeth. the rear cassette

65. ## English-Jane Eyre

This is a book review that I have wrote for Jane Eyre by Charlotte Bronte. Could you please check if I have any obvious mistakes and give me a comment for this? Or a grade out of 20? 1. Title: Jane Eyre 2. Author: Charlotte Bronte 3. Genre: Romance,

66. ## College math

A planehas 7 hrs. to reach a target and come back to base. it flies out to the target at 480 miles per hr. and returns on the same route at 640 miles per hour. how many miles from the base is the target?

67. ## math 116

can you help me explain this one? 9 + 6 x (8 - 5)

68. ## English

In these two sentences, I'm not sure where to put the apostrophe to make it a plural possessive noun. We were excited to see the (children) photographs. The pictures looked like real (photographer) pictures.

69. ## English

Edgar Allan Poe Biography Please Check!! (teacher limited to be 3 paragraphs only. Please check my sentence fluency, grammar, and point out any unimportant points of his life.) Edgar Allan Poe was born in Massachusetts, Boston, on January 19, 1809. His

70. ## science

how does the life cycle of hatena compare to the origin of eukaryotic cells as noted in Margulis’ Endosymbiotic Theory? something about how one life form engulfs another and incorporates it, evolving until it becomes dependent on it and has created an

71. ## Chem

i don't get this ?.......If the weather forecast stated that the pressure is 104.2kpa. then what is the pressure in the atmosphere? and what would a barometer measure in mm of mercury need help please

Would it be easier to defend a case regarding real property or intellectual property?

Estimate the value of the cell potential for the following rxn: Mn02(s) + 4H30+(pH=3.8) + 2Ag(s) --> Mn2+(aq, .1M) + 6H20(l) I got Ecell=.48V delta G circle= -92640 J/mol and delta g = -107484 is this correct?

Okay, my child is doing problem solving lesson 5-7 in scott foresman addison wesley book. The question that we are having a problem with is a number line. there are 10 spaces in the number line and the clues are: Clue 1: the number are between 70 and 82

It say set 12: subtracting 2; differences of 2. A triangle has a 3 on top and a 2 on the left bottom?

76. ## physics

a person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg. a. determine the force exterted on the

77. ## math

identify the independant and dependant variables. A photo lab charges 15 cents per print.

78. ## english

I need help rewriting this sentence. There has been an ongoing controversy in Canada on whether the drinking age should be lowered to eighteen like most of the world (Russia, Argentina, Hong Kong, etc.) or if it should stay at nineteen. using this

79. ## college

How others view a person can influence how that person views his or her environment and those in his or her environment

80. ## Social Studies

What is George's Bush policy on science?

81. ## math

how far is it from California to colodrado?

82. ## y912f

Consumers can encourage manufacturers to keep their operations in the United States by buying only American-made products. Do you want to buy only products made in the United States(NO). Write a five paragraph essay defending your position. i just need

83. ## Julius Caesar

In Act II scene iv of Shakespeare's Julius Caesar, what is wrong with Portia?

84. ## BEH 225

What areas of psychology gained a positive outcome from the discovery or use of some of the psychological medications used and why?

85. ## math

x = 3 - y^2 y = x - 3 Find the points of intersection. If someone could even get me to the point where it gets written in general form (both equations set to 0..) I would be forever grateful.

86. ## law and ethics

Compare and contrast contributory negligence with comparative negligence

It say set 12: subtracting 2; differences of 2. A triangle has a 3 on top and a 2 on the left bottom?

88. ## U.S. History

please check these,my answers are in CAPS 1.Europeans fought the Crusades a. to establish new trade routes to the Indies b. to put limitations on European trade C. TO TAKE CONTROL OF JERUSALEM FROM MUSLIM TURKS d. to convert Muslims to Christianity

89. ## global

how did the ancient Hebrews maintain their religion as they traveled from place to place?

90. ## college

all records in a file must be uniquely identiied in at least one attribute which is its primary key. identify primary key Record Type: Accounts payable Inventory Customer Sales Orders Purchase Orders to Vendors Cash Receipts (checks) from Customers Cash

91. ## accounting

how do i calulate my ss witholdings from my paycheck? i know its 6.2% of my earnings. So if i made 551.65 for the year i would take 551.65*6.2% and subtract that answer from the 551.65?

92. ## computers

I have this problem with my PC The sound won't function properly. I've checked the volume controls and audio properties, etc, but they seem to be working fine. It's just that the sound won't come out. I've also tried installing a new set of speakers, yet

93. ## science

IS IT RIGHT TO MAKE CHANGES TO THE QUALITIIES OF HUMANS!

94. ## chemistry

i did a lab and found that of the products two gases were formed H2 and H2CO3 the question is... What are the tests that will verify the identity of these gases? what is this asking?

95. ## spanish

which of these is right? wouldn't they both be? 1. no se aburría nadie. 2. no me aburría nadie. thanks so much :)

96. ## Another algebra

Determine the number of positive integers n that satisfy: 1/2 < n/n+1 < 99/101 I don't know how to solve this besides plugging in random numbers, which would take all day. Any other suggestions for a faster way to solve it? Thank you!

97. ## math

How can you tell if a number is a multiple of 6?

98. ## math

the pass code to mrs.kyles alarm system is 6 digits.each can be from 0 - 6 and can only be used once.how many different combinations can mrs.kyle come up with?

99. ## MATH116

I'm not to sure about this but would it be written in this form: 2x + 4=6? Let me know if this is correct or not, I'm terrible with Algebra.

100. ## social studies

which religion began in the middle east shintoism, hinduism, judaism or buddhism

101. ## marketing

Consider a recent purchase that you or a family member has made (examples: a household product, a DVD or CD, a grocery item, an electronic device, etc.) Describe the item and list three main reasons you purchased that product as opposed to another product.

102. ## english

the term freewriting refers to?

103. ## Math-Algebra

[SQRT(x + 3)] - [SQRT(x - 2)] =1 Can someone help me solve this equation.

104. ## earth science

what do two of the stars in the bowl of the big dipper point to ?

105. ## math

y= a*tan pi/p (x-c)+d what letters represent the following domain: range: asymtotes: period: p phase shift: c vertical: d I can't figure out the rest

106. ## Fractions

__ Change 1.01 to a fraction Book says answer is 100/99. not clear why?

107. ## ecology

what is a stamen

108. ## English-Repost

Hello! English is my second language, and at the moment, unfortunately, I don't have anybody who can read my paper since both my parents are not fluent in English. And I'm probably living on the other side of the earth, since it is now ten thirty pm.

110. ## math fraction word problem

Betty needs to stack boxes 13 3/4 inches tall. The ceiling is 16 feet. How many can she stack?

111. ## math help

Solve for t: 4 6 -- = -- t+3 1-2t

112. ## Social Studies

What is a right action; good quality? We are learning about India, and I'm not sure what it is asking here.

113. ## social

how beliek system spread over large areas?

114. ## English

What is an analogy?

115. ## history

who was the 3 priesident of th u.s