Questions Asked onJanuary 13, 2008

1. physics

you slide a 325N trunk up a 20 degree inclined plane w/ constant velocity by exerting a force of 211 N parallel to the inclined plane a) what is the comp. of the trunk's weight parallel to the plane? b) what is the sum of the Fa, friction and the parallel

asked by physics time..
2. Physics

ball 1 with an initial speed of 10 m/s collides elastically with stationary balls 2 and 3 that are initially in contact with each other. the centers of balls 2 and 3 are on a line perpendicular to the initial velocity of ball 1. the three balls are

3. General Chemistry

The photogenic work function of a metal is the minimum energy needed to eject an electron by irradiating the metal with light. For calcium, this work function equals 4.34 x 10^-19 J. What is the minimum frequency of light for the photoelectric effect in

4. Physics

A flea pulls on a puck with force 7 microN at an angle of 30°. Another flea pulls on the puck with force 2 microN at an angle of -60°. a) What is the magnitude of the net force on the puck? (I got 7.28 uN) b)At what angle is the net force? ( I got about

5. Religion

What countries of origin Hinduism, Buddhism, Confucianism and Daoism? What are historical figures and events Hinduism, Buddhism, Confucianism and Daoism? What are the central beliefs of Hinduism, Buddhism, Confucianism and Daoism? The nature of god of

6. Physics

Two negatively-charged bodies with -5.4e-5 C are 0.20 m from each other. What force acts on each particle? F=kqq/d^2 F=(9.0e9)(q)(q)/(.20^2) Would both q's equal -5.4e-5 C?

7. chemistry

i have to write chemical formulas and balance them: nitrogen and oxyen---> nitrogen monoxide N2+02---->2NO nitrogen monoxide and oxygen----> nitrogen dioxide gas. NO2+O---->NO2 (i'm not sure about this, please check) nitrogen dioxide and water----> nitrous

8. Physics

A car traveling at a constant speed of 125 km/hr passes a trooper hidden behind a billboard. One second after the speeding car passes the billboard, the trooper sets in a chase after the car with a constant acceleration of 2.7 m/s^2. How far does the

9. math algebra

A train averaged 80 km/h for the first half of its trip. How fast must it travel for the second half of the trip in order to average 96 km/h for the whole trip? The answer is 120 km/ h but how do i set it up and get there? thanks for you help

10. (another homework)classroom management

what is the difference between classroom management and classroom discipline?...

asked by klar maesen
11. Physics

A positive charge of 3.0e-6 C is pulled on by two negative charges. One, -1.9e-6 C, is 0.045 m to the north and the other, -3.7e-6 C, is 0.030 m to the south. What total force is exerted on the positive charge? F=kqq/d^2 You would have to find the F

12. Chemistry

Can someone check my answers for me thank you. I have the equation balanced below. 2H2O + K2SO4 --> H2SO4 + 2KOH Ionic equation for the reaction between sulfuric acid and potassium hydroxide. 2H+ + SO4^2- + 2K+ + 2OH- --> 2K+ + SO4^2- + 2H2O Net equation

13. Math accounting

The following selected transactions were completed by Pilgrim Delivery Service during July: 1. Received cash from issuing capital stock, \$115,000 2. received cash for providing delivery service, \$58,000 3. Paid advertising expense, \$2,000 4. Paid creditors

14. Chemistry

Could someone please check my Chemistry homework? The molecular formula for cisplatin, a chemotherapy agent, is PtCl2(NH3)2 (The numbers are all supposed to be subscripts) 1. What is the molar mass of cisplatin? Ans: 300.06 g/mol 2. How many moles of

15. Physics

The hydrogen atom contains a proton, mass 1.67 10-27 kg, and an electron, mass 9.11 10-31 kg. The average distance between them is 5.3 10-11 m. The charge of the proton is the same size, opposite sign of the electron. a)What is the magnitude of the average

16. finance

There is a preferred stock that pays a dividend of \$5.00 at the end of each year. The stock sells for \$60.00 a share. What is the oreferred stocks require rate of return?

17. Chemistry

How many kilograms of aluminum can be extracted from 2.0 metric tons of the ore 'alumina' (Al2O3)?

18. Chem.

Three emission lines involving three energy levels in an atom occur at wavelengths x, 1.5x, and 3.0x nanometers. Which wavelength corresponds to the transition from the highest to the lowest of the three energy levels? Please help me, thank you very much

19. Chemistry

Please help me break this problem down.. Thanks lot. Light with a wavelength of 425 nm fell on a potassium surface, and electrons were ejected at a speed of 4.88 X 10^5 m/s. What energy was expended in removing an electron from the metal? Express the

20. comparative essay

okay this is my intro Egar Allen Poe is well known for his Gothic Novels.There are many different enterpretations of "the Raven" that have been presented over the years.Edgar Allen Poe and The simpsons rendition of "the raven" are similar in some ways and

21. Algebra 2

I have taken algebra 2 for three years in a row. I take notes daily, I pay attention in class, I have a tutor, and yet I am in the same position again. I currently have a 56.7% in my algebra 2 class. I have one test and the final exam before final grades

22. SCI

Energy Resource Challenges  Post a 200- to 300-word response to the following: Describe all of the renewable energy alternatives (WIND POWER, SOLAR POWER, BIOMASS FERMENTATION) What are some challenges with using and managing these

23. math

What is the defintion of supplementary angles and complimentary angles and what is the difference?

24. physics

An astronaut weighs 696 N on the Earth. What is her weight on planet X, which has a radius Rx = Rearth 1.60 and a mass Mx = Mearth 8.60? -the only equation I know for weight is "w = m x g"...I don't know how to solve for w using force.

25. geometry

the surface area of a sphere if the radius, r, is 6 meters.

26. homework help site w/ all subjects?

does any one know of any other homework help site where people can draw stuff and explain things, the site covers all subjects, but i forget wat the site is, and i dotnt want a paying site like stupid tutor vista..

asked by any other hmwrk help site?
27. Physics

a 5 kg block with a speed of 3 m/s collides with a 10 kg block that has a speed of 2 m/s in the same direction. After the collision, the 10 kg block is observed to be traveling in the original direction with a speed of 2.5 m/s. a) what is the speed of the

28. Algebra

sovle the compound inequality 8

29. Data Management

Sorry...i wrote the previous questions wrong.. The producer of HB pencils has 720 pencils randomly chosen from each day's productions. A defect rate of 15% is acceptable. a) Assuming that 15% of all manufactured pencils are defective, what is the

30. History

Which was not a cause of agitation by the Parisiaan lower classes in the 18th century. a.taxation b.farming methods c.Overpopulatin d.free trade e.feudal rents i think it is D. Free trade

31. Science

What is an example of mutualism found in caves?

32. French

En 1939, des militaires globaux étaient en conflit et la Deuxième Guerre Mondiale commence. Elle a divisé plusieurs nations du monde en deux alliances militaires : les Alliés et les puissances d'Axe. La Deuxième Guerre Mondiale a été connue comme le

33. Writing

How can I end this? ____ The bridge I made a model of is the Sydney Harbor Bridge. The bridge is located at Sydney, Australia. The Sydney Harbor Bridge is the main way to cross the Sydney Harbor carrying rail, vehicular, and pedestrian traffic between

34. geometry

Find the surface area to volume ratio for a rectangular prism with edge lengths 7, 5 and 11

35. English

What is wrong with this sentence. Grammar wise... If he cannot attend the game, an elemental fan, according to an article in SPORTS ILLUSTRATED entitled "Buck Wild For The Bucks", will watch the game on TV with family or friends.

36. how come

it takes forever to get a reply from a teacher? i asked a question about science 12 hours ago, yet no one has helped me. do you have any suggestions of where else i could go for help?

37. slope

In a rectangle ABCD, the slope of line AB is 1 and the slope of line BC is -1/2. What is the slope of the altitude to line AD the altitude to line CD. Thanks in advance.

38. financial management

suppose you purchase a home for \$150,000.and obtain a 90% mortgage loan, 30 yr. maturity, at a fixed annual interest rate of 80% with deferred monthly payments. What is the monthly payment for principal and interest on this loan?

39. Accounting

Year end inventory at cost \$55,902, at retail 84,700. Questions: A year-end physical inventory at retail prices yields a total inventory of \$78,550. Prepare a calculation showing the company's loss from shrinkage at cost and at retail.

PLEASE HELP. I am stuck on this question. Which of the following is not one of the outside forces impacting an agency head? A. Legislators B. The courts C. Demands of unionized workers in the agency D. Special Interest groups

LAST QUESTION I PROMISE> I AM STUCK PLEASE HELP In the area of public administration, which of the following is considered to be a reformer? A. Franklin D Roosevelt B. Dwight D Eisenhower C. Gerald R Ford D. Calvin Coolidge

42. physics

starting from rest, a ball rolss, down an incline ata constant acceleration of 2meters per second what is the velocity of the ball after 8.5 seconds? how far does the ball roll in 10 seconds? any one can help pleasse im stuck

43. physics rewrite

starting from rest, a ball rolls, down an incline at a constant acceleration of 2meters per second squared what is the velocity of the ball after 8.5 seconds? how far does the ball roll in 10 seconds? any one can help pleasse im stuck show n detail how to

44. Religion

Historical figures and events:Hinduism Confucianism Buddhism And Daoism

45. Science

Farmer Jackson plowed a field at the top of a hill and then had a crop dusting plane spray weed killer on the field. After a few days, he noticed that there were still a lot of weeds in the field. He noticed that weeds in a field that was located right

46. Algebra

I reduced a diagram on my computer using a scale factor of 8o%(i.e. the linear dimensions of the diagram were reduced so they became 80% of the original dimensions). What scale factor is required to return the diagram to original size?

47. Geometry

If I know the number of sides of a regular polynomial(10), how do I find the exterior and interior angles?

48. AP Biology

We just did the Osmosis and Diffusion lab in Biology. My teacher wants us to use water potential (and its equation) to explain the results....how do I use the water potential equation?

49. Algebra II

Add, multiply, divide, or subtract as indicated. 1. (x + 7) (x2 – 3x + 2) 2. (x + 7) – (x2 – 3x + 2) 3.(x + 7) + (x + 7)

5y-5y=0

51. Physics

"The exact relationship for the period T of a simple pendulum is T=2*pi*sqrt_of(l/g) where l is the length of the pendulum, and g is the acceleration of gravity." I have to rearrange the formula to where you solve for l instead of t. I started to try to do

52. physics

what is the vert. comp. of vector with magnitude 88.5m/s and whose horiz. comp. is 75.4m/s? what is the direct. of this vector?

53. physics

a force accelerates a car of mass 1240 kg at 2 km/hr. what is the force? i need help how do you get the acceleration? i know f=ma but what's the a? or is this the wrong equation?

54. Algebra 2

Solve: 0 = x3 + 5x2 + 2x – 8 Solve: 0 = x3 – x2 – 11x – 10

55. Math

Tori needs 9 15/16 yards of fabric for one project. She needs 1 7/8 yards of fabric for another project. How much fabric is needed for both projects?

56. geometry

The oblique prism has a height of 6 inches, a width of 2 inches and a length of 7 inches. Find the volume

57. Algebra

f(x) = -8x4 – 3x + 2 1. Given the function above, what is the right end behavior? 2. Given the function above, what is the left end behavior? 3. Given the function above, what is the maximum number of turns?

58. Math

solve: 4x+18=22 please help. i just need to understand how to do this for i have many problems like this on my final, and i have forgotten how!

59. physics

A projectile hits a target placed on a level field. It has arange of 37.0 m. The nagle of launch is 33.4 degrees above the horizontal. What was the initial speed?

60. Maths/Law of sines

I have a spherical triangle and I know 1 angle 31.3 degrees and all 3 sides which are 1624, 2118.4 and 1078.85 nautical miles. In order to find the other 2 angles I know I must use the law of sines: sin A over a = sin B over b = sin C over c If angle A is

61. Chemistry

I was supposed to figure out whether the following equations produced precipitates or not. Here are my answers, but I know that they are wrong. So I still can't figure out where I'm messing up...? Please help! HgCl2 (aq) + K2CrO4 (aq) = Yes Ba(OH)2 (aq) +

62. Calculus

My book says to do the following problem via computer and via hand: Calculate the definite Integral of e^-x * cos x dx over (0, +infinity) My TI-89 calculator gets 1 (it gets the same thing when I replace infinity with 999). when I do this by hand, I get:

63. Calculus

Suppose that the region between the x-axis and the curve y=e^-x for x>=0 has been revolved around the x-axis. Find the surface area of the solid. I got 3*pi The book shows an answer of pi * [sqrt(2) + ln(1 + sqrt(2))] Where do I go wrong? For the sides of

64. Algebra 2

indicate whether the function is quadratic. (-5x-4)(-5x-4) then 2(x+2)squared-2xsquared

65. Geometry

How do I find the number of sides a regular polygon has if I only know te measure of the exterior angle, such as 40 degrees?

66. Math

Wha are the roots of x to the second power divided by x minus six equals Zero?

67. Math HELP please

____ How do you simplify these? / \/ 24 Including numbers such as 40 60 and 48?

68. Algebra- functions

How do I know how many possible zeroes of a function there are? I have a graph and i have to find how many zeroes there are.

69. Geomety

Find the distance between each pair of parallel lines y= -3/4x-1 3x+4y=20 Please help

70. Latin

In Catullus' 3rd poem what does "Veneres Cupidinesque" refer to and what is the signifigance of "passer"? I've checked some sites but they don't give me clear explanations to these 2 things.

71. Segregation

If segregation was really bad ,why did it start in the first place?

72. history

whatdid the people of ancient ghana have that the proto bantu speaking people have did not have

PLEASE HELP Public organizations borrow money from the private sector to avoid conflict with A. Taxpayers B. Policymakers C. Banks and lenders D. None of the above

The capture hypothesis states that public organizations A. Steal employees from the private sector B. Battle for more than their fair share of tax monies C. Become influenced by special constituencies D. will, when given the opportunity, bleed resources

75. Comparative essay

okayyy well im still working on that comparative essay on the simpson version of "the Raven" by A.E poe and the origional poem... and well im comparing moods between the both and well i don't know what to talk about... like what's diferent between the two

76. math

okay i need to find a complamentry angle whos difference is 12 degrees

77. math

okay i need to find a complamentry angle whos difference is 12 degrees

78. Algebra

What are the formulas sum of perfect cubes and difference of perfect cubes? bobpursley said to use them in one of my other posts but I don't know those formulas.

79. Data Management

The producer of HB pencils has 720 pencils randomly chosen from each day's productions. A defect rate of 15% is acceptable. a) Assuming that 15% of all manufactured pencils are defective, what is the probability of finding at least 80 percent defective

80. history

the 1801 concordat between Napolean and the pope resulted in all of the following except a. Napoleon beecame head of the French chirch woth the right to appoint and dismis bishops b. the vatican accepted the confiscation of its lands by the revolutionary

81. math help please

2% of 55 and 14is 70% of what number

82. Psychology

We (3) have to lead half hour class discussion on introduction to Psych., ask 3 questions, make a case study. We don't know where to start. It's only introduction?? Help!! tx

83. Data Management

The producer of HB pencils has 720 pencils randomly chosen from each day's productions. A defect rate of 15% is acceptable. a) Assuming that 15% of all manufactured pencils are defective, what is the probability of finding at least 80 percent defective

84. physics

i don't understand how to do this question, its a phys 11: "A skier is acc. down a 30.0 degree hill at 3.80m/s^2" a) What is the horiz. comp. of the acc.? b) What is the vert. comp. of the acc.? c) Assuming she starts from rest and acc. uniformly down

85. language

How can you tell a valid opinion from a bias opinion? I realize when they are obviously slanted, but what makes an opinion valid?

86. Algebra

what are the 3 formulae for slope? Thank you so much! -Raziel

87. geometry

What is the surface area of this right cylinder? Dimensions are in meters. Use 3.14

88. geometry

If a sphere has a diameter of 4 inches, what is the volume? Use 3.14 for

89. math

There are 2 similar triangles. 1 has coordinates (2,3)(3,4)(2,7). The other has coordinate (7,6) and letter A for the right corner of the base and P for the top. A has coordinates 1)(9,8) 2)(10,9) 3)(7.5,6.5) For each case find the scale factor for

90. Chemistry

"Under constant conditions of P(pressure) and T(temperature) (and R [gas constant]), write an equation showing d(density) written as a function of M(molecular mass)." I don't understand this, really! Please help! Thanks in advance!

91. Science

How limbless salamanders evolved according to Darwin's theory of natural selection.

92. Physics

What is the total charge on all of the electrons in two liters, 2 kg, of water? One mole of water has a mass of 18 g and each molecule of water contains 10 electrons. Way I worked problem: (2kg)(1000g/1kg)(1mol/18g)(10e-/1mol)(-1.60e-19/1e-) What I did do

93. Algebra 2

1. Is the absolute value of 4-x >14 a disjunction or a conjunction? 2. If you have a function what is domain?

94. Math

evaluate f(3) when f(x)=5x=9 please help me. i don't understand what the f stands for and what im supposto do... thanks!

95. Algebra

Factor completely: 1. 8x3 + 2x3 – 12x –3 2. 27x3+8 3.125 – 8x3

96. english

I have a test over literary devices and we have to write which devices are used in a speech of some sort. But I need to find a way to practice it...any advice or websites?

97. Science

Stanley had been collecting shells and stones for several years. One day he was walking along shore of a lake and found a beautiful stone. When he turned the stone over, noticed that there was an imprint of an animal on the bottom. His mother said it might

98. Math

Please help with this question. Determine an algebraic model for Alvins data and use it to make a reasonable prediction for the population in 2036. I am having trouble with the algebraic model. thanks

99. Science

How are valence electrons involved in the formation of a covalent bond? They gave me the answer as...They are shared with another atom (or atoms). However, i thought they shared electrons not atoms...it confused me

100. Science

What happens if you submit a sedimentary rock to intense heat and pressure?

101. history

All of the following are truewith regard to the French philosophers except a. Their ideas sparked the french revolutin b. they promoted the rights of the lower classes, the min participants in the French Revolution c. They contributed to the new forms of

1. To five decimals it is a fact that log(2)=.30103 Compute the following to three decimal places usuing ONLY this fact and the logarithmic rules and the definition of a logarithm. a. log100 (2) --base 100 b. log1000 (square root of 2) -- base 1000 2.

103. english

when writing the word GRADE ONE in a sentence...would it be Grade One (where there both capital) Grade one (where only grade is capital) or grade one (where none are capital)

104. Algebra

I posted this earlier in the day but no one answered. Can anyone help with these problems? Factor completely: 1. 8x3 + 2x3 – 12x –3 2. 27x3+8 3.125 – 8x3

105. Percent error?

What is the formula for percent-error? It's either: %error= (your value/accepted value)*100 or %error= (accepted value/your value)*100 I'm pretty sure it's the first one, but I also heard it can go either way. I tried both ways but I end up with two

106. Social Studies

I need an idea for making a craft project that has to do with the Cherokee Indian Tribe. Thank you!

107. mass affects on energy

I need to come up with an experiment for observing how mass affects energy. Does anyone have any suggestions?

108. algebra

if f(x) = x^2 - 2x, find f(x+2) - f(2) / 2 the answer is: x+2 but l got: x^2 - 2x - 8 = 0 which is x = 4 or x = -2

109. linguistics

what is a firthian linguistics?...its full structure and history...

asked by klar maesen
110. Science

How are valence electrons involved in the formation of a covalent bond?

111. Physical Science

Hello, The following problem I worked out with this formula: V2=V1+gt. I came to the the answer 78.4 m/s. Can you tell me if that is correct. Thank You If a stone with an original velocity of 0 is falling from a ledge and takes 8 seconds to hit the ground,

2x=0

113. Math

Determine how far electricity travels in 16 mins. a. 1,785,600 mi b. 17,856,000 mi c. 178,560,000 mi d. 1,785,600,000 mi

114. Math

solve: y(squared)-144=0 please help, for like the other one, i have this on my final too. Thank You!

115. Science

How do you explain how air resistance works?

116. MATH

a^-1 + b^-2 / a^-2 + b^-1 The answer is ab(b^2 + a) / b(b+a^2) How do I set that up and work the problem out? thanks for the help

117. Is their a history tutor on Board right now?

I really need help with my homework. On the hand I do appriciate all the other help I have gotten the past other days I have been on the website.My grades have been boosted up all because of the help Ive gotten on here

118. MATH

sorry. i messed up the last one. its evaluate f(3) when f(x)=12x-5 sorry. but if you could help, it would mean the world to me. : ) Thansk!

119. science

What is Boyle's and char?les's Law

120. Social Studies

What were Egyptain portrait masks made of?

121. English

What are some ideas of writing a satire or parody of a stereotype in todays western world.

122. history

One reason for middle class resentment of the French Aristocracy was that a. The aristocracy paid no taxes while the bourgeoisie paid heavely b. The middle class felt shut out of many government offices and honors I think it is A.

123. history

The napooleonic code a. banned labor unons b. increased individual rights and limited the state's powers ub crunubak cases I think it is b

124. Algebra

When are 2 lines parallel? It's where there are no solutions to the set of equations of the lines, right?

125. MATH HELP

14000 ACRES OF LAND 12% IS PATIO 25% LIVING SPACE AND REST IS LAWN SQUARE FOOTAGE FOR EACH PORTION OF LAND USING PERCENTAGES

126. Science

Science project: how does the type of liquid affect weathering. Where do I find info on this subject? I am not sure what questions to ask/answer to start this project

127. Latin

I need to create a modern interpretation on Horace's ode 1.9, but I don't know what to write about. If anyone could help me I would be grateful.

128. Algebra- functions

How do I find the solutions and factors of a function when given only the graph?

129. Social Studies

What was the substance used to stuff in the mummy's nostrils?

-5t = t+12

131. Math...

asked by Erin(im so confused!)

-5t = t+12