1. AP Physics

A light string that is attached to a large block of mass 4m passes over a pulley with negligible rotational inertia and is wrapped around a vertical pole of radius r. The system is released from rest, and as the block descends the string unwinds and the

2. Physics

a ball of mass m is attached by two strings to a vertical rod (lower string is at a right angle to rod). the entire system rotates at a constant angular velocity w about the axis of the rod. A) assuming w is large enough to keep both strings taut, find the

3. Chemistry

O3 + NO --> O2 + NO2 (all in gas state) Calculate the change in enthalpy for the reaction at room temp. using the following data ^Hf: O3 = 143 NO = 90 NO2 = 33 So, I have 143+90--> X + 33. I don't know what the enthalpy of O2 is. I assume you simply

4. Chemistry

Iodide Ion is oxidized to hypoiodite ion IO- by hypochlorite ion ClO- in basic solution. The equation is I- + ClO- --- IO- + Cl- Initial concentraition I- ClO- OH- exp 1. 0.010 0.020 0.010 exp 2. 0.020 0.010 0.010 exp 3. 0.010 0.010 0.010 exp 4. 0.010

5. Math

1. Explain the advantages and disadvantages of both the substitution method and the elimination method for solving a system. Help please. The only reasons I can think of is because in substitution it might be more difficult cause there's a possibility of

6. Physics E&M

A proton and an alpha particle ( q= + 2e, m=4u ) are fired directly toward each other from far away, each with an initial speed of 0.01 c.What is their distance of closest approach, as measured between their centers?

7. Physics E&M

Three electrons form an equilateral triangle 1.00 nm on each side. A proton is at the center of the triangle.What is the potential energy of this group of charges?

8. Physics

In designing a velocity selector that uses uniform perpendicular electric and magnetic fields, you want to select positive ions of charge +5e that are traveling perpendicular to the fields at 8.75 km/s. The magnetic field availabe to you has a magnitude of

9. Physics

A steady horizontal force F if magnitude 21N is apllied at the axle of a solid disk. the disk has mass 2.0kg and diameter of 0.10m. What is the linear speed of the center of the disk after it has moved 12m?

10. Physics

a ball of mass m is attached by two strings to a vertical rod (lower string is at a right angle to rod). the entire system rotates at a constant angular velocity w about the axis of the rod. A) assuming w is large enough to keep both strings taut, find the

11. physics

A single conservative force F = (6.0x - 11)i N, where x is in meters, acts on a particle moving along an x axis. The potential energy U associated with this force is assigned a value of 24 J at x = 0. (a) What is the maximum positive potential energy? At

12. algebra 2

log72-log(2x/3)=0

13. biology-multiple choice question

In order to survive, all organisms must carry out: 1. autotrophic nutrition 2. heterotrophic nutrition 3. enzyme-controlled reactions 4. the process of locomotion Help??

14. math/probability

204 / 205 - EXERCISES FOR SECTION 4.2 18- WHAT ARE EQUALY LIKELY OUTCOMES? 19- DESCRIBE THE DIFFERENCE BETWEEN AN IMPOSSIBLE EVENT AND A CERTAIN EVENT IN PROBABILITY. BE SURE TO PROVIDE EXAMPLES. 26- ALZHEIMER'S DISEASE. THE BAR GRAPH IN FIGURE 4.3 SHOWS

15. substitution

Tickets to a movie cost \$7.25 for adults and \$5.50 for students. A group of friends purchased 8 tickets for \$52.75. Write a system of equations to represent the situation. How many adult tickets and student tickets were purchased?

16. Chemistry

The thermal decomposition of nitryl chloride NO2Cl, 2NO2Cl---> 2NO2 + Cl2 is thought to occur by the mechanism shown in the following equations: NO2Cl---> NO2+ Cl NO2Cl + Cl --> No2+ Cl2 the rate is [NO2][Cl] is this right

17. Physics

a ball of mass m is attached by two strings to a vertical rod (lower string is at a right angle to rod). the entire system rotates at a constant angular velocity w about the axis of the rod. A) assuming w is large enough to keep both strings taut, find the

18. Chemistry

The decomposition of ozone is believed to occur in two steps O3 O2 + O O3 + O ---> 2O2 Identify any reaction intermediate. What is the overall reacion? I got O3 + O3 --> O2 + 2O2

19. Chemistry

In a kinetic study of the reaction 2NO(g) + O2 --> 2NO2(g) the following data were obtained fro the initial rates if disapperance of NO: Initial concentraition NO O2 Inital Rate NO exp 1. 0.0125M 0.0253M 0.0281 M/s exp 2. 0.0250M 0.0253M 0.0112 M/s exp 3.

20. physics

Figure 8-31 shows a ball with mass m = 1.0 kg attached to the end of a thin rod with length L = 0.56 m and negligible mass. The other end of the rod is pivoted so that the ball can move in a vertical circle. (a) What initial speed must be given the ball so

21. math: Calculus - Algebraic Vectors

A light plane is travelling at 175 km/h on a bearing of N8°E in a 40 km/h wind from N80°E. Determine the plane's ground velocity using algebraic vectors. The answer for this question is: 167 km/h , N5°W ---------------- My Work: (a , b) = ( | r | *

22. Probability

What is the probability of spinning a number greater than 5 OR less than 3 on this spinner? This problem has a picture of a spinner with 8 sections divided equally. The sections are labeled: 1,2,3,4,5,6,7,8.

23. Algebra

Can you solve for a variable in an equation?

24. American Sign Language

What is a asl classifier for President? What is a asl classifier for woman? What is a asl classifier for letter? What is a asl classifer for brother?

25. Math

A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 80ft of fence? 800 sq ft? What should the dimensions of the garden be to give this area? 40ft

26. math

Kenisha sells athletic shoes part-time at a department store. She can earn either \$500 per month plus a 4% commission on her total sales, or \$400 per month plus a 5% commission on total sales. Write a system of equations to represent the situation. What is

27. biochemistry

show how to convert cyclohexanol to these compounds? a) cyclohexene b) cyclohexane c) cyclohexanone d) bromocyclohexane

28. Health Care

Give an example of ineffective communication that resulted in bad customer service in the medical office and discuss strategies for overcoming perceived service issues.

29. Chemistry

Based on the balance equation 2C6H14+19O2 gives 12CO2+14H2O calculate the moles of CO2 formed when G moles of H2O formed

30. Chemistry

To obtain the rate of the reaction 3I-(aq) + H3AsO4(aq) + 2H+(aq) --> I3-(aq) + H3AsO3(aq) + H2O (l) I got that the rate is 1/3 delta [I-]/ delta t = delta [H3AsO4]/ delta t is this correct

31. Chemistry

Write a rate equation showing the dependence of rate in reactant concentrations for each of the following elementary reactions. a. CS2---> CS + S b. CH3Br + OH- --> CH3OH + Br- A. k[CS2][S] B. k[CH3][Br-][OH-]

32. Math- consecutive intigers

A student opens a math book to two consecutive pages with a sum of 1640. What are the two pages? I would need one odd number and one even. 819 and 820 are as close as I can come. What am I missing?

33. Chem

O3 + NO --> O2 + NO2 Write the rate law equation for the reaction. Explain how you obtained your answer. Experiment 1: [O3] .0010 [NO] .0010 Rate of formation of NO2 x Experiment 2: [O3] .0010 [NO] .0020 Rate of formation of NO2 2x Experiment 3: [O3] .0020

34. AP Physics

A light string that is attached to a large block of mass 4m passes over a pulley with negligible rotational inertia and is wrapped around a vertical pole of radius r. The system is released from rest, and as the block descends the string unwinds and the

35. managerial economics

After two quarters of increasing levels of production, the CEO of Canadian Fabrication & Design was upset to learn that, during this time of expansion, productivity of the newly hired sheet metal workers declined with each new worker hired. Believing that

36. Physics

A 97.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.70 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.80

37. Chemistry

What is the molecularity of each of the following elementary reactions? A. O+O2+N2----> O3+N2+ B. NO2Cl + Cl---> NO2 + Cl2 C. Cl + H2 ---> HCl + H D. CS2----> CS + S

38. Biology

In peas, tall plants (T) are dominant to short (t), purple (P) is dominant to white flower color (p), and round seeds (R) are dominant to wrinkled seeds (r). What is the phenotype of a plant with genotype TtppRr?

39. chem

For a primitive cubic unit cell, r=6.0 what is the body diagonal in terms of r, the lattice pt radius

40. Dr.Bob => nylon question posted again.since nxt pg

new in bold (copied in normal text) 0.5g hex (1mol/116.21g)= 0.004302mol hex 0.5g adi (1mol/183.03g)= 0.002731mol adi Limiting: 0.002731mol adi(1mol nylon/1mol adi)(226.319g/1mol nylon6.6)= 0.61807 g Nylon Supposed to have theoretically: 0.61807g Nylon

41. Chemistry

To obtain the rate of the reaction 3I-(aq) + H3AsO4(aq) + 2H+(aq) --> I3-(aq) + H3AsO3(aq) + H2O (l) I got that the rate is 1/3 delta [I-]/ delta t = delta [H3AsO4]/ delta t is this correct

42. chemistry

Answer the following for a body centered unit cell. edge in terms of r, the lattice pt radius face diagonal in terms of r, the lattice pt radius body diagonal in terms of r, the lattice pt radius

43. Chemistry

convert 175f to c convert 325f to k covnert 575 cal to J canvert 23 Cal to J

I am confused about this question, and can't find anything on the internet, anyone care to explain? Why is the tertiary structure of an enzyme, such as amylase, so important? An enzyme is a protein, so is it really asking why is this stage important? And

45. managerial economics

Engineers at a national research laboratory built a prototype automobile that could be driven 180 miles on a single gallon of unleaded gasoline. They estimated that in mass production the car would cost \$40,000 per unit to build. The engineers argued that

tanx=cotx

47. chemistry

Answer the following for a face centered unit cell. r=6.0 edge in terms of r, the lattice pt radius face diagonal in terms of r, the lattice pt radius body diagonal in terms of r, the lattice pt radius

48. PHYSICAL SCIENCE

A ROCK WITH A WEIGHT OF 156.8 NEWTONS FALLS 5 METERS. WHAT POTENTIAL ENERGY DOES IT HAVE JUST BEFORE THE END OF ITS FALL.

49. math :] 2

Is 14/3 a rational number? I think so... but I'm confused because if you divide 14 by 3 then the decimal part is .66666666666666666666667. Is that considered a repeating decimal? If it is, then it's a rational number. I'm just doubting because of the 7 at

50. Chemistry

Does anyone know why amines show high solidility in water? Could my answer be: Amines exhibit high solubility in water because they form bonds with the water thanks to the hydorgen bonds, but large amines are not soluble in water since the effect of this

51. Biology

In horses, B = black coat, b = brown coat, T = trotter, and t = pacer. What genotype is a black trotter that has a brown pacer offspring?

How do I write my x intercepts as an ordered pair when my X-Intercepts at X = { 2.64575, -2.64575 }?

53. BIOLOGY

Why don't viruses grow and why don't they experience homeostasis? Thank you in advance!

54. physical science

what are the uses of CaCo3+2HCl=CaCl2+CO2+H2O?

55. Biology

What does it mean for a virus to have homeostasis? Does anyone know why viruses don't have homeostasis?

56. Math

How do I draw the following problem so I have something to refer to when answering a) and b)? A river is 2 km wide and flows at 6 km/h. A motor boat that has a speed of 20 km/h in still water heads out from one bank perpendicular to the current. A marina

57. science

Sasha wants to find the resistance of the motor. She measured a 6 V drop across the motor that is in a series circuit with a 200 ohms reseistor. The power source is supplying 9 V to the circuit. How musch resistance is her motor putting into the circuit?

59. chemistry

For the following: a)give the reaction type; b)complete and balance the reaction; c)using your answer to part b, determine how much of the other reactant is needed, and how much of each product will be formed, for the given starting amount (below); and d)

60. Math- Algebra

This one showed up in the middle of my quadratic equations. There is no y or 0. What am I supposed to do with it? Give exact and approximate solutions to three decimal places. (x+5)^2=81

61. English

hello, I have to write a research paper on a paticular author. I chose Mary Shelly since we just finsihed reading Frankenstein. I need to narrow down my topic to make it more specific. I don't know how to start. I want to somehow relate her life with

62. chemistry

Answer the following for a body centered unit cell. type of packing type of holes # atoms / 1 unit cell coordination #

63. chemistry

325*f to kelvin

64. Chemistry

If you put together two liquids and they react, but don't necessarily give off heat, would that still be an exothermic reaction because they don't take outside energy to react with each other?

65. Algebra(3 of 3)

Simplify y^2 + y - 20/y^2 - 2y - 8 A)y - 5/y - 2 B)y + 5/y + 2 C)5/2 D)y - 10/y - 4 I chose A. I don't know how to do it.

66. Math

Are all linear equations functions. I'd say yes. Because both contain domain and range. But..not all are graphed linear. when is a linear equation not a function?

67. Chemistry

Dehydration of an alcohol has what major project? This is what I think, does this make sense to anyone? The major project of dehydration of an alcohol is that alcohol loses a water molecule. An H- and -OH are removed from the adjacent carbon atoms of the

68. sewing/embroidery

the word to be unscrambled is dtervaiga

69. Physics

What do I have wrong in here? A stone is thrown vertically upward at a speed of 60.0m/s. a) How long after being thrown is it 175m above ground? So i did - d = V1t + 1/2at^2 175 = 60t + 1/2 (10)t^2 (rearranged and divided it all by 5) 0 = t^2 + 12t - 35

70. 12 Chemistry

I was just wondering if you could tell me what evidence there is that supports the statement: carboxylic acids are soluble in an aqueous solution. I have an answer all ready, and I have searched the internet, but I was just interested in a little

asked by FOR A SCIENCE TEACHER ONLY!!!
71. Algebra 1

Entomology is the scientific study of insects. Patty, Ronny and Sammy collected some insects for their science project. At the end of the first week of collecting, Patty and Ronny together had 89 insects, Ronny and Sammy together had 80 insects, and Patty

72. pre-algebra

The problem really said convert 3 seconds into days. Then the next question was convert 2 inches into yards.

73. math

2x-3y=24 x+6y=18 substitution to solve system of equation. no sulution of infinitely many solutions

74. Geometry

Letting L1=ax+by+c=0 and L2=px+qy+r=0. The equation of anyline passing through the intersection of L1 and L2 is L1+kL2=0 where k is a variable depending on just how the actual line through the point is. Can anyone prove this because all i get is 0=0.

75. Geometry

I have no idea how to solve this problem. The question says: Determine whether the points A(4,5), B(-3,3), C(-6,-13) and D(6,-2) are the vertices of a kite. Explain your answer. Can you please help me with the steps to solve it and understanding it.

76. managerial economics

After two quarters of increasing levels of production, the CEO of Canadian Fabrication & Design was upset to learn that, during this time of expansion, productivity of the newly hired sheet metal workers declined with each new worker hired. Believing that

77. Algebra

Solve 3x^2-8x+4=0 by graphing. If exact roots cannot be found, state the consecutive integers between which the roots are located. A)2;between 0 and 1 B)between 0 and 1;between 7 and 8 C)1,2 D)between 0 and 1;between 3 and 4 I don't understand this one

78. Ethics

What are the goals of punishment and corrections? Explain the rationale behind those goals. How does the concept of community corrections relate to these goals and rationale?

79. music

music written polyphonically is called what?

80. american history

what businesses came under the scrutiny of the sherman antitrust act in the 1800s?

81. Physics

A small aircraft takes off and accelerates for 1 min at the rate of 1.5m/s^2. it then maintains a constant flying speed for 20mins after which it lowers its flaps, descends and reduces its speed uniformly, coming to rest in 45secs. Using a separate sheet

82. American History

I am writing a research paper on President Abraham Lincoln I have to describe reasons why he was such an influential leader. I need at least 3-4 main ideas to work with on this paper and so far I only came up with one..he ended slavery...any suggestions?

83. spanish

thank you so much, for helping my daughter unity, she is only 6 years old and is taking spanish classes.on that last unscramble word i did forget a letter! so its,encory,if you can help that will be great!OR i will try your method, and try to figure it out

84. Physics

What do I have wrong in here? A stone is thrown vertically upward at a speed of 60.0m/s. a) How long after being thrown is it 175m above ground? So i did - d = V1t + 1/2at^2 175 = 60t + 1/2 (10)t^2 (rearranged and divided it all by 5) 0 = t^2 + 12t - 35

85. pre-algebra

How do you convert 3secs. into days?

How do you do a word cited page? please help me so confused. Paper due tomorrow. Thank you

What are two square roots of ten?

88. english

can someone help me to proofread my argument paragraph and to see whether this is a good argument paragraph or not? if not, please tell me what i need to do for the improvement. thanks The article, ¡§Why Cell Phone Use While Driving Should Be Banned¡¨

89. algebra 2

log50+log(x/2)=2

90. math

Kenisha sells athletic shoes part-time at a department stoe. She can earn either \$500 per month plus a 4% commission on her total sales, or \$400 per month plus a 5% commission on total sales. Write a system of equations to represent the situation.

91. English

Why is emily !@#\$%^&inson referred to as Belle of Amherst

92. Math Analysis

The solution of 5x>2x is?

93. Math

A painter needs 3 days to paint the walls of a room. How long would it take him, working at the same rate, to paint a room that is twice as long, twice as wide and twice as high as the original room?

94. math

log(x+(3/10))+logx+1=0

95. College Calculus

What is the integral of cos^6x? I tried half angle identities but it didn't really help...

96. Physics

How long would it take for a beam of light to travel around the earth in an ideal fiber-optic cable?

97. Chem

For all three of the cubic lattices (unit cells), what two things are the same size?

98. Algebra(1 of 3)

Solve the matrix equation 2x + 5y = 1 x + 3y = 0 for y. A)1 B)3 C)-3 D)-1 I chose D 2x + 5y = 1 y = 5 - 2x x + 3(5 - 2x)= 0 x + 15 - 6x = 0 7x = 15 x = 15/7 I know that's wrong I don't know what to do

99. math

I am lost. Question: Blake bought 21 books. The least he spent for a book was \$18. The most he spent for a book was \$25. What could be the amount that he ended up paying for his books? a.\$375 b.\$530 c. \$175 d. \$445

100. physics

Using the data below, suggest a proportionality statement. Length (cm) Frequency (Hz) 100 0.46 80 0.52 60 0.62 40 0.74 20 1.01 I think it's f ¡Ø 1/¡Ìlength (one over square root of length) or is it l ¡Ø 1/f^2 By the way, the length is the controlled

101. English

Grandma said yes, we need more apple juice. Correct for capitalization and punctuation.

103. Chemistry

I found the charges on all of the following atoms and found out that Mn was reduced and C was oxidized. CH3OH- + MnO4- ----> Mn2+ + CH2O 2e-/C 5e-/Mn x 5 x 2 = 10 = 10 5CH3OH- + 2MnO4- ----> Mn2+ + CH2O Can anyone help me balance the rest?

104. Phsysical Education

need information on, if you have completed your degree from a university in Alabama, but decided to move to another state, what would you need to be able to teach in that state. Include everything you would need to teach in that state, degrees, exams,

105. Length and width

The width of a rectangle is 2ft less than its length. The area is 8ft^2. Find the length and width. I can't seem to come up with anything that equals 64 sq ft. Do I start with area 64sqft.=W x L-2. I feel like I should be coming up with something around 7

106. Physics - stuck

Car A has an initial speed of 15m/s and is gaining speed at 1.5m/s^2. Car B has an initial speed of 20m/s and is gaining speed at 2.0m/s^2. The initial distance between them is 168m. Find when and where the cars will pass one another and their speeds as

107. science(chem) plastic hedache...can anyone help?

My hwk Q that I was trying to find the answer to yesterday is this below but I don't know exactly how the placticizing process works. I compiled the chemicals I think I need but other than that I'm stumped as to how to put them together or how. Q: A water

108. math

A circular coffee table has a diameter of 5 ft. What will it cost to have the top refinished if the company charges \$3 per square foot for the refinishing?

109. Science

Suggest some uses for a plastic that disolves in water

110. English

need to do a project on VICTORIA - and would like some examples of templates and setting it out etc. Can anyone help?

111. precalc

Hi. Can someone help me with this? Simplify: (sin^2x)(cos^2x)+(sin^4x) The answer is sin^2x, but I have no idea how to get there! Thanks!

112. health ethics

when does personhood begins? and what is the criteria of a person

113. math

when will a product be positive regardless of the number of factors? & when will a product be negative regardless of the number of factors?

114. MATHS

WRITE AS A DECIMAL THE FRACTION SIX,AND TWOHUNDRED AND FOURTY- THREE THOUSANDS.

115. biology

Describe the events that occur at the neuromuscular junction. (mechanism of action of neuromuscular junction)

116. algebra

(1/4)^2x=(1/2)^x

Utilisez la forme correcte du verbe indique. Apres le match, nous parlons (parler) de nos activites du dimanche. Les parents de Sarah ne dejeunent (dejeuner) jamais au restaurant le dimanche. Le vendredi soir, mes amis et moi, nous dansons jusqu'a 2 heures

1. Describe how you could approximately find the total number of particles in a rectangular box that is 2m x 2m x 3m by making no more than 12 samples. 2. You know the following facts about a function f(x): The derivative of f(x) is 6x + 4. The integral of

119. math

x+14y=84 2x-7y=-7

120. chemistry

what is the major product of dehydration of an acohol?

121. math

0.3x-0.2y=0.5 x-2y=-5

122. Algebra III

3^2x - 6 x 3^x + 9 = 0 Solve for x I have no Idea what to do

4.Why is acceleration or delay of payments more useful to an IC than to smaller, separate companies? i was able to answer all but this question. i have read the material required but i don't quite get what they are asking?

124. Algebra(2 of 3)

The vertices of ABC are A(-3,-4),B(-1,3),C(3,-2). The triangle is rotated 90 degrees counterclockwise. Use the rotation matrix [0 -1][1 0] to find the coordinates of C' A)(-3,2) B)(4,-3) C)(-3,-1) D)(2,3) I chose A [0 -1] x [-3 -1 3][-4 3 -2] =

125. Physical Science

What is the total number of electrons in a normal atom of hydrogen?

126. Calc help!

Describe how you could approximately find the total number of particles in a rectangular box that is 2m x 2m x 3m by making no more than 12 samples.

127. Algebra

Simplify: (1+i)/(2-i) A)(1/3)+(2/3i) B)(1/5)+(2/5i) C)(1/3)+(i) D)(1/5)+(3/5i) I have no clue

128. Chemistry

How do you determine the type and number of each type of element in H2SO4?

129. Organic Chem

Why is Diels Alder reaction stereospecific?

130. math :]

Is 14/3 a rational number or a irrational number?

131. Science

Would you expect the inverse-square law to always hold accurately for the stars in the sky? Explain.

133. math

how do i multiply fractions with diffrent denomenators?

134. Math

Let's do this again: is 14/3 a rational number even though the calculator says .666666666667? Please answer all questions, thank you.

135. Criminal law

"self induced intoxication negates mens rea, hence no crime is committed" justify the statement.

136. Biology

What does it mean when one says that viruses don't have homeostasis?

137. Math

Find the Inverse Function: y=4x-x^2

138. 12 Chemistry

So I forgot, but I have one more I want to check while I am here (I seriously have a need for perfection, and want to include all of the details I can :P). So, what evidence is there that the esters synthesized in the lab are soluble? Again, thank you so

asked by FOR A SCIENCE TEACHER ONLY!!!

140. Social Studies

Where could i find out all about the Arawaks and Caribs?

141. math

An A-frame cabin has a triangular front with a base of 30 ft and a height of 20 ft. If the front is to be glass that costs \$3 per square foot, what will the glass cost?

142. chemistry

Why do amines exhibit high solubility in wate?

143. people

who quoted this statement The NEW ENGLAND governments are in state of rebelion.

144. Algebra

What is the difference between an equation and an expression?

145. people

who quoted this statement The NEW ENGLAND governments are in state of rebelion.

146. Analysis & Design

A milestone is a goal or objective and deliverables from the milestone are something like what will happen from the milestone? Am i correct?

2.4^(3x+1)=9

148. maths

ALL OF JENNYS PETS ARE DOGS EXCEPT ONHE. HOW MANY CATS AND DOGS DOES JENNY HAVE,

149. english/ help revise

Uganda, still, is in a desperate state of emergency. On the state level, the government of Uganda has failed to fulfill its responsibility to protect civilians from the massive human rights violation committed against them. Despite Uganda being a