# Questions Asked onFebruary 6, 2008

1. ## Chemistry

Caffeine C8H10N4O2, is a stimulant found in a tea and coffee. A sample of the substance was dissolved in 45.0g of choloroform CHCl3 to give a 0.0946m solution. How many grams of caffine were in the sample. m = molality

2. ## physics

two charged particles are projected into a magnetic field that is perpendicular to their velocities. if the particles are deflected in opposite directions, what dose this tell you about them?

3. ## managerial econ

As manager of Citywide Racquet Club, you must determine the best price to charge for locker rentals. Assume that the (marginal) cost of providing lockers is 0. The monthly demand for lockers is estimated to be Q = 100 - 2P where P is the monthly rental

4. ## Chemistry

NaCl crystallizes in face-centered cubic cell. what is the total number of ions(Na+ ions and Cr- ions) that lie withing a unit cell of NaCl? 2 4 8 6 5

5. ## Chemistry

What mass of solution containing 6.50% sodium sulfate N2SO4 by mass contains 1.50g Na2SO4 Set up a proportion. (g Na2SO4/g solution) = (1.50 g Na2SO4/x g solution). Solve for x. Check my work. how do you fine g solution

6. ## Chemistry :)

Cr2O3 + 3CCl4 ---> 2CrCl3 + 3CCl2O In one experiment, 6.37 grams of Cr2O3 was treated wiht excess CCl4 and yielded 8.75 grams of CrCl3. What was the percent yeild? I have no idea how to do this. I know that percent yield is actual/theorectical yield *100.

7. ## accounting

Doug Maltbee formed a lawn service business as a summer job. To start the business on May 1, he deposited \$1,000 in a new bank account in the name of the proprietorship. The \$1,000 consisted of a \$600 loan from his father and \$400 of his own money. Doug

8. ## Chemistry

The unit cell with all sides the same length and all angles equal to 90 degrees that has lattice points only at the corners is called monoclinic body-centered cubic primative cubic face-centered cubic spherical cubic

9. ## physics

what is the magnetic effect of placing two wires with equal but oppositely directed currents close together or twisted about each other?

10. ## physics

when preparing to undergo an MRI scan, why are patients advised to remove eyeglasses, watches, jewelry, and other metal objects?

11. ## chemistry

why aerosol cans have warning "Do not expose to high temperature and do not incinerate"?

12. ## Calculus

Prove the identity and give its domain. 4sinxcosx+sin4x=8sinxcos^3x

13. ## Chemistry

what is the volume of the unit cell? A metal crystallizes in a face-centered cubic lattice. The radius of the atom is 0.197 nm. The density of the element is 1.54 g/cm^3

14. ## physics

A lawn tractor tire turns at 65rpm and has a radius of 13cm. What is the linear speed of the tractor in m/s?

A NEW STATE LAW MANDATES THAT ALL EMPLOYERS MUST PORHIBIT SMOKING ON PRESMISES. THE LAW FURTHER PROVIDES THAT ANY EMPLOYER WHO ALLOWS EITHER AN EMPLOYER OR A CLIENT/CUSTOMER TO SMOKE BE SUBJECT TO A COURT ORDER REQUIRING THE EMPLOYER TO ENFORCE THE LAW.

16. ## Chemistry

How would you prepare 455 g of aqueous solution that is 6.50% sodium sulfate Na2SO4 by mass? percent by mass = grams/100 g solution. X grams/455 = 0.065 solve for X. Subtract 455-X to calculate how much water must be added. ok i got -454.935 is this right

17. ## Physics 11

The brakes on a car permit it to decelerate at the rate of -8.0m/s^2. How much distance is required to stop this car when it is travelling 60.0km/hr? The answer given is 173.6m I solved it this way 60km/h = 16.667m/s A=V/T 16.667m/s / -.80m/s^2 = 20.834

18. ## Physics

Two charges are placed between the plates of a parallel plate capacitor. One charge is +q1 and the other is q2= +5.00x10^-6 C . The charge per unit area on each plate has a magnitude of sigma=1.30 x 10^-4 C/m^2. The force on q1 due to q2 equals the force

19. ## Physics

A ball rolls horizontally off the edge of a tabletop that is 1.80 m high. It strikes the floor at a point 1.42 m horizontally away from the table edge. (Neglect air resistance.) (a) How long was the ball in the air? (b) What was its speed at the instant it

20. ## Metrics =0

What items are measured in kiloliters, hectoliters, decaliters, deciliters, and centiliters. I need items that would be measured in each of these units. Im making a poster. The kiloliter would be an appropriate unit to measure the volume of a ___________.

21. ## us histroy

what problems were present in american life during the late 1880s and early 1990s This all has to deal with the progressive era

22. ## math

An ESP study discovers a subject whose performance appears to be better than guessing. The experimenter looks at many cards bearing one of five shapes (star, square, circle, wave, and cross) in an order determined by random numbers. The subject cannot see

A NEW STATE LAW MANDATES THAT ALL EMPLOYERS MUST PORHIBIT SMOKING ON PRESMISES. THE LAW FURTHER PROVIDES THAT ANY EMPLOYER WHO ALLOWS EITHER AN EMPLOYER OR A CLIENT/CUSTOMER TO SMOKE BE SUBJECT TO A COURT ORDER REQUIRING THE EMPLOYER TO ENFORCE THE LAW.

24. ## French

Our French class was given an assignment where each student would write a letter in French to a child in the 5th grade. I have looked up letter writing in French but I can only find ways to write formal letters. How would I begin the letter when writing to

25. ## managerial econ

Movie attendance dropped 8 percent as ticket prices rose a little more than 5 percent. What is the price elasticity of demand for movie tickets. Could price elasticity be somewhat overestimated from these figures? That is, could other things have changed,

26. ## managerial econ

The price elasticity of demand for imported whiskey is estimated to be -.20 over a wide interval of prices. The federal government decides to raise the import tariff on foreign whiskey, causing its price to rise by 20 percent. Will sales of whiskey rise or

27. ## Physics

A small plastic ball with a mass of 6.50x10^-3 kg and with a charge of +0.150x10^-6 C is suspended from an insulating thread and hangs between the plates of a capacitor. The ball is in equilibrium, whit the tread making an angle of 30 degrees with respect

28. ## Chemistry

What portion of the volume of each atom or ion on the face of a unit cell is actually within the unit cell 1/2 1/4 3/4 all of it none of it

29. ## PHYSICS

a MAGNET CAN EXERT A FORCE ON A MOVING CHARGED PARTICLE, BUT IT CAN NOT CHANGE THE PARTICLE'S KINETIC ENERGY. WHY?

30. ## Geography

1-What is a benefit of nuclear power? 2-How does nuclear compare to coal? 3-What are some problems with nuclear power? 4-What does rector do? 5-What does a generator do? 6-What is the waste of these power stations, what is the problme with it? 7-What must

31. ## Physics

Two charges are placed between the plates of a parallel plate capacitor. One charge is +q1 and the other is q2= +5.00x10^-6 C . The charge per unit area on each plate has a magnitude of sigma=1.30 x 10^-4 C/m^2. The force on q1 due to q2 equals the force

32. ## world history

what nickname had he received after commanding African American soldiers of U.S 10th Cavalry Regiment (known as the Buffalo Soldiers) during his early career as an army officer? Colonel Edward Hatch

33. ## world geography

What are the United States agricultural imports?

34. ## Physics

A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 38.0 above the horizontal. You can ignore air resistance. Calculate the horizontal distance from the base of the building to the point

35. ## physics

If gear A has 30 teeth and is spinning at 800rpm, gear B has 50 teeth and gear C has 20 teeth and gear D is spinning at 300rpm. How many teeth does gear D have?

36. ## Physics

Is this the proper description of the statement...(it's a d-t graph) The slope of the graph at point A is 30. Ans: The instantaneous velocity of the object at point A is 30. Or is it supposed to be instantaneous acceleration.

37. ## Spanish Sra J Mcguin Help

Answer questions positively using complete sentences 1. Me afeite esta manana antes de ir al trabajo? 2. Nos ponemos los vestidos en la habitacion del hotel? 3. Te duermes en el cine cuando ves peliculas aburridas? 4. Se sienta Ana delante de Frederico en

38. ## Biology

I need to find a way to measure protein concentration. It's for part of my infection and immunity lab report. We've done about radial immunodiffusion calculating the concentration of bovine serum albumin in unknown samples, and the last question is: What

39. ## Essay

Assess America's contribution to the Allied victory in World War I. Do you think that the US's involvement was crucial to victory? Why or why not.

40. ## economics

The price elasticity of demand for imported whiskey is estimated to be -.20 over a wide interval of prices. The federal government decides to raise the import tariff on foreign whiskey, causing its price to rise by 20 percent. Will sales of whiskey rise or

41. ## Physics

A small plastic ball with a mass of 6.50x10^-3 kg and with a charge of +0.150x10^-6 C is suspended from an insulating thread and hangs between the plates of a capacitor. The ball is in equilibrium, whit the tread making an angle of 30 degrees with respect

42. ## managerial econ

After Iraq invaded Kuwait, gasoline prices rose dramatically-up to 50 percent. There were many effects of the increased price of gasoline> Explain the following effects in terms of income effect, or the substitution effect, or both effects: a. People drove

43. ## Science

In science, my teacher gave out an assignment where we had to group the months of the year, kind of like the seasons. I have absolutely no ideas, and was wondering if anyone else had some input on the assignment.

44. ## Physics

A swing is 2m long. how often do you need to push it to increase its swing's amplitude the most? L=2m When amplitude is the most KE=0 and PE is at its maximum. But i'm not completely sure how to solve this problem.

45. ## physics

A small plastic ball with a mass of 6.50x10^-3 kg and with a charge of +0.150x10^-6 C is suspended from an insulating thread and hangs between the plates of a capacitor. The ball is in equilibrium, whit the tread making an angle of 30 degrees with respect

46. ## Physics

A string of mass m=.1kg is stretched to where its length is L=20m. What is the tension force applied to the string if it takes a pulse 2 seconds to get from one end to the other? m=kg L=20m T=4s mass density =m/L = .1/20 = kg/m Tension =? I know

47. ## Physics

A small plastic ball with a mass of 6.50x10^-3 kg and with a charge of +0.150x10^-6 C is suspended from an insulating thread and hangs between the plates of a capacitor. The ball is in equilibrium, whit the tread making an angle of 30 degrees with respect

48. ## English

using literary elements, compare and contrast Abigail Adams' letter to her daughter with Jan de Crevecoeur's Letters from an American Farmer. HELP?!

49. ## algebra

Factor - check by multiplying Is this right? x^2-6x = x^2(x-6)???

50. ## Chemistry

A mole of pennies stackd on top of one another would reach from here to the sun and back how many times?

51. ## Science

If an air mass from the gulf of mexico is pushing north into pittsburgh which has been under the influence of a canadian air mass for several days, what are the conditions now in pittsburgh and what will they be two or three days from now?

52. ## algebra/martix mode

how do you put the equation in standard form

53. ## sra Mcguin

is this correct nosotros nos duchamos antes de entrar en la piscina not sure if I put in antes?

54. ## algebra or math

find the two equations of lines that are parallel and perpindicular to the lines with this eqaution. y=3x+9 how do u do this

55. ## calculus

what is the answer for the integral of (1/(xln(x)) from 1 to infinity? I first found the integral using u substitution- so u=ln(x) and du=1/x*dx this gave my du/u,leading to the ln(u) =ln(ln(x)) from 1 to infinity then I did the limit as t approaches

56. ## monitoring student progress

[RECALL] that before a teacher assigns homework or tests, he or she needs to monitor studentsâ€™ progress to determine their level of understanding. Monitoring techniques include both formal and informal observations [IDENTIFY] a time-efficient way to

57. ## Chemistry

what is the molar volume of the metal in cubic centimeters(avogadro's number should be used for this problem -1cm=10^7 nm)

58. ## Ap Chemistry Help

3.) One method used in the eighteen century to generate hydrogen was to pass steam through red-hot steel tubes. The following reaction takes place: 3Fe(s)+4H20(g)--->Fe3O4(s)+4H2(g) 2. What mass of iraon will react with 500.0 L of steam at 25 degrees C and

59. ## essay

can you please look over this essay I'm already late and need to turn this in today? Most people believe that America waged war against Iraq in March of 2003. But the truth, unannounced to many, is that America, along with Britain, had already planned to

60. ## algebra

is this right? Divide and check: 12x^3y^2/2x^5y^2 answer: 6x^-2

61. ## History

The surname of the king who claimed the throne in 1066 ?

62. ## COM 135

In order for technical communication to be effective, the writer must evaluate the intended audience, its characteristics, knowledgebase, expectations, and requirements. Address the following issues as they relate to the user manual you will create for the

Which group includes urban professionals that likely prefer an apartment to a house in the suburbs? A. Baby busters B. Baby boomers C. All of the above D. Generation X E. Generation Y I think the answer is B. Baby boomers....is that correct? My other

64. ## algebra

Factor c^2+3c-54 v^2-4v-21

65. ## math

I do not understand how to set up this problem so i can solve it. Jeff Bagwell of the Houston Astros has 104 hits in 325 times at bat. Matt Williams of the Arizona Diamondbacks has 88 hits in 275 times at bat. Do they have the same batting average?

66. ## Chemistry

What is the molar volume of the metal in cubic centimeters? (Avogadro's number should be used for this problem ------ 1 cm = 10^7 nm what is the molar volume of the metal in cubic centimeters(avogadro's number should be used for this problem -1cm=10^7 nm)

67. ## Physics

A capacitor is made from two 1.2 cm diameter coins separated by a 0.18 mm thick piece of paper (K = 3.7). A 6 V battery is connected to the capacitor. How much charge is on each coin? My solution: C= K * Permitivity * A/d = q/v I solved for q and got 1.2 X

68. ## algebra

Is this correct? subtract (4a^3+2b^3)-(6a^3+5a^2b-2ab^2+2b^3) answer: -2a^3-5a^2b+2ab^2

69. ## writing(for ms.sue)

what should i put that would happen if the students were no longer together...(no more racially diverse classrooms)

70. ## Math

I just want to double check myself. For the decimal 8.62354....what is the place value of 3? Thousandths -----correct? For the decimal 7.58021....what is the place value of 1? Hundred-Thousandths------correct?

71. ## math

One triangle has vertices A, B, and C. Another has vertices T, R, and I. Are the two triangles similar? If so state the similarity and the scale factor. AB- 6 BC- 8 AC- 10 TR- 10 RI- 7.5 TI- 12.5

72. ## algebra

A family of 2 adults and 4 children visited Sentosa during the June holidays.An adult ticket cost \$18.90 and a child ticket \$12.80 during the promotional period.if the family enjoyed the promotional price,what was the total cost of the tickets for the

73. ## US history

explain The British mercantile system and its purpose and significant consequences

74. ## Pre-Calculus

rewrite using radicals and rational numbers Cos 3(pi)/8

75. ## world hitory

what is the tem for the German attacks on merchant an passenger ships carrying Americn citizens that were resumed in December of 1916 and were largely responsible for the United States entering the war on the side of the Allies? Lusitania

76. ## math ridals

what is a duck that steals called

77. ## world history

more than forty nations joined the League of Nations, agreeing to negotiate disputes rather than resort to war. Members of the League promised to take common action--economic or even military--against any aggressor state. What was the one key nation that

78. ## science

what is produced by nuclear decay

79. ## essay help

i got to write an essay about my history. Like, origin/culture, heritage etc...But I don't know that much about my origin/culture, heritage, so anyone want to help me?

80. ## Chemistry

Determine the mass of the element. What element is it? what is the molar volume of the metal in cubic centimeters(avogadro's number should be used for this problem -1cm=10^7 nm)

81. ## world history

who was the President of the United States that had won re-election in 1916 on the platform "he kept us out of the war" that now led the country into world War I? Woodrow Wilson

82. ## Public Speaking

I have to do an informative speech over a country that I've visited. I am stuck on getting some main points. So far, I have climate and attractions as my main points. I was also kind of thinking that I could talk about the kinds of food people eat in this

83. ## Physics

Can I use P1/P2=(T1/T2)y/y-1 to find the temperature when we pressure liquid refrigerant, for example liquid propane?

84. ## Chemistry

LAB STUDENT is asked to determine the heat of neutralization for H + OH --> H2O by combining 1 M NaOH and 1 M HCl in an open styrofoam calorimeter. Assume 1. solutions are same temp at start 2. densities of solutions are the same as h20 3. specific heat

85. ## world history

when Woodrow Wilson returned from Paris with the Treaty of Versailles, he had to overcome opposition to its ratification in the Senate. Who was the Republican senator from Massachustts that as the chairman of the Senate Foreign Relations Committee led the

86. ## Writing

What would be some creative writing prompts I could write about? Sci-Fi related or anime or something like that?

87. ## Life Skills

We have to do one page about our history. I don't have any ideas what to put though. Can anyone give me some suggestions?

88. ## Science

Would the molecules move faster or slower in syrup?

89. ## accounting

Was Maltbee's summer work successful? Give the reason for your answer. What are the steps in the accounting cycle?

90. ## world history

what was the name of the British liner that was torpedoed and sunk by a German U-boat in may of 1915 that resulted in the death of almst 1200 passengers, 128 of them American citizens? Lusitania

91. ## chemistry

how is possible that we can get esters of carbon acid anhydrides but of esters we can't make anhidrous acids?

92. ## health

I have no idea what to do for a project can you help me?

93. ## mult. and dividing fractions

she has to make 5/7 of a turkey, and also equal groups of 1/3 are needed. HOW MANY groups are there?

94. ## Physics

Find the instantaneous velocity of a pendulum at the instant when its bob is at the height equal to half of its maximum height h=(h_max/2) above the equilibrium point. Assume the max velocity of the bob during each oscillation is v_max= 2m/s. Wouldn't

95. ## ecology

how do i make a number period if i am given a grid and a number of different numbers to work with?

96. ## physical science

a player uses a hockey stick to increase the speed of a 0.200 kg hockey puck by 6 m/s in 2 seconds. how much force was exerted on the puck? how much force did the puck exert on the hockey stick?

97. ## Psychology

Scenario: John is an 18-year-old freshman at New York University. John was the starting quarterback at his high school in a small town in Indiana. He enjoys playing sports and hanging out with friends. John has always been popular and done well in school

98. ## physical science

find the net force produced by a 40 newton force and a 50 newton force in each of the following cases: both forces act in the same direction. both forces act in opposite directions.

99. ## physical science

a player uses a hockey stick to increase the speed of a 0.200 kg hockey puck by 6 m/s in 2 seconds how much force was exerted on the puck?

100. ## Sci/275

What are freshwater and ocean water resources?

101. ## Math

How do I find the perimeter of a rectangle if the length is 5/12 inch and width is 1/2 inch?

102. ## Chemistry

This isn't really a homework question but I had been thinking about it today after class. Why does the concrete around an outdoor swimming pool become too hot to walk on while the water stays cool?

103. ## managerial econ

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

104. ## urgent spanish one question

is this correct grammar - si, ponemos nuestra los vestidos en la habitacion del hotel?

105. ## math

A piece of land measures 3 3/4 acres and is for sale at \$60,000. What is the price per acre? How do I set this up? 3*4+1=15/4 15/4 divided by 60,000/1????

106. ## Math

could you maybe give me and euqation using the numbers 21, 2, 6, 19 & 13 that give a total of 3? Please :)

107. ## math

how do you come up with a equation for a line?? helpppp!!!!

108. ## Chemistry

Given the weight of phenacetin and its percentage yield...how would I calculate its melting point?

109. ## spanish

can anyone help me correct this please ? En mi colegio, las chicas llevan un jersey azulmarina, una falta negro y una camisa azul. Lo bueno que tiene uniforme escolar es que muestra clase y personas no son intimidadas a causa de su estilo de ropas que es

110. ## MED SCHOOL

I want to be a plastic surgeon, is going to a community college for my general eds going to affect me?

111. ## physcal science

How much light do two ideal polaroids that are oriented with their axes parallel to each other transmit?

112. ## Word

Umm I`m not quite sure what zeal means like if someone were to say I had no zeal to live what would that mean? that dosen`t make much sense to me

113. ## math

Choose the correct greatest common factor of 75, 195, and 325.

114. ## s cience

decribe how a population differs from a community.using an example. decribe how an ecosystem differs from a community using an example.

115. ## spell

antonym of unusual and against

116. ## physcial science

a player uses a hockey stick to increase the speed of a 0.200 kg hockey puck by 6 m/s in 2 seconds how much force did the puck exert on the hockey stick?

117. ## religon

lent is the time of what?

118. ## math

Days on Planet Red are 13 hours long. The animals on Planet Red have regular eating and sleeping habits. The silver snake sleeps for 150 hours, eats for 6 hours, then goes back to sleep. The green walking fish sleeps for 364 hours, eats for 26 hours and

119. ## civics

Can someone give me a website about segregation facts that is still happening now?

120. ## world history

what did support for the war effort by women help them win in counries like Britain and the United States once the war was finally over? right to vote

121. ## science

where is the nucleus located?

122. ## English

would this be a proper way to start a sentance: You see like for example You see, I had a dream.

123. ## Chemistry

Provide the units for each of the terms of q=mCp^T Thanks!

125. ## english

What did Zora Neale Hurston and Langston Hughes do for America in the 1920's?

126. ## Chemistry

what is the volume of the unit cell

127. ## Chemistry

Determine the mass of the element? what element is it? Ca Ag Ti Mg Al

128. ## Math

use linear combinations to solve the system of linear equations. 2x+y=4 x-y=2

129. ## writing!(urgent)

i need some reasons why segregated classroom (by race) would be a bad idea.

130. ## PHARMOCOLOGY

aLTERNATIVES FOR GABAPENTIN, LESS SIDE EFFECTS. NEURONTIN ORIGINALLY PRESCRIBED FOR NEUROPATHY, POST BONE MARROW TRANSPLANT.

131. ## marketing

Why do you think newspaper publishers use telemarketing to develop a customer base?

132. ## arithmetic

how do you add fractions with uncommon denominators?

133. ## world history

Between March and September of 1918 a series of offensive on both sides culminated with the German General Staff's recommendation to the kaiser that the war could nt be won. At their suggestion, the kaiser adicated his throne and fled into exile. In what

134. ## Science

I need help finding three freshwater resources and three ocean water resources and their descriptions.

135. ## Social Studies

I need to find what the caribbean regions natural resources are, but I can't figure it out. I tried Google and Ask, but I couldn't find any helpful websites.

136. ## Math

The greatest common factor of 20, 45, and 116.

137. ## Political Science

I need help interpreting a paragraph in the federalist papers. It is Federalist No. 10 the paragraph is. "It is in vain to say, that enlightened statesmen will be able to adjust these clashing interests, and render them all subservient to the public good.

What did Fre!@#\$%^& do to make statues?

139. ## us histroy

how were trust a problem during the progressive movement

140. ## math

if your dividing decimals do you count the place value or do you just bring the decimal staite down?

141. ## social studies

what is the difference between democrats and republicans?

142. ## English

how do you properly quote a fammous quote

143. ## stupid test online

what would leryec be unscrambled

144. ## Science

How much does an average fourwheeler weigh?