Questions Asked on
July 14, 2010

  1. Physics

    A 3.0 kg block being pulled across a table by a horizontal force of 80 N also experiences a frictional force of 5 N. What is the acceleration of the block?

  2. Physics helppp

    Figure 5-53 shows a man sitting in a bosun's chair that dangles from a massless, frictionless pulley and back down to the mans's hand. The combined mass of man and chair is 94 kg. Fig. 5-53 With what force magnitude must the man pull on the rope if he is

  3. AP Chemistry

    what is the molecular shape of OCCl2 ion? C is the central atom. Options: 1. seesaw 2. tetrahedral 3. trigonal pyramidal 4. trigonal planar 5. trigonal bypyramidal 6. octahedral

  4. stats

    If one of the 87 flights is randomly selected, find the probability that the flight selected arrived on time given that it was and Upstate Airlines flight. _____________On Time Flights _________________ Late Flights Podunk ___________ 33

  5. Physics

    Please show how you got the answers, not just the answers. A 40.0 N force stretches a vertical spring 0.250 m. (A) What mass must be suspended from the spring so that the system will oscillate with a period of 1.0 s? (B) If the amplitude of the motion is

  6. 10th grade

    perimeter of a regular pentagon with side measurements of 57 centimeters

  7. College physics

    150 pJ of energy is stored in a 1.0 cm times 1.0 cm times 1.0 cm region of uniform electric field. What is the electric field strength?

  8. trig

    can you help me find cos 2x if sin x = -12/13 (x in 3rd quadrant)

  9. geometry

    Use the diagram below to answer the following questions.||. Show all work to receive credit a. Find the value of x. b. Find m

  10. geometry

    what is the volume of earth if the diameter of earth is 7920 miles.

  11. physics

    1. Suppose that the strength of the electric field about an isolated point charge has a certain value at a distance of 1 m. How will the electric field strength compare at a distance of 2 m from the point charge? I know it's At twice the distance the field

  12. Physics helppp

    In the figure below, three ballot boxes are connected by cords, one of which wraps over a pulley having negligible friction on its axle and negligible mass. The masses are mA = 30.0 kg, mB = 40.0 kg, mC = 28.0 kg. The image is a horizontal pulley, with

  13. College physics

    Two 2.4 cm diameter disks spaced 1.5 mm apart form a parallel-plate capacitor. The electric field between the disks is 4.3×10^5 V/m. What is the voltage across the capacitor? How much charge is on each disk? An electron is launched from the negative

  14. stats

    Among the contestants in a competition are 44 women and 26 men. if 5 winners are randomly selected, what is the probability that they are all men?

  15. General Chemistry

    PLEASE ANSWER VERY SOON I AM STUCK! Crystalline silicon has a cubic structure. The unit cell edge length is 543 pm. The density of the solid is 2.33 g/cm3. Calculate the number of Si atoms in one unit cell.

  16. math

    what is the value of 5!/4!?

  17. Chemistry

    A sample of air contains 78.8% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 35 degrees C and 1.00 atm?

  18. Chemistry

    Many analytical instruments require liquid nitrogen. While filling an instrument with liquid nitrogen, an analytical chemist slips and spills the contents of the dewer, 29.0 L, onto the floor. Since the boiling point of liquid nitrogen at 1.00 atm is 77.4

  19. chemistry

    Given the reaction: C3H8(g) + 5O2(g) ¨ 3CO2(g) + 4H2O(g) What is the total volume of H2O(g) formed when 8.00 liters of C3H8(g) is completely oxidized?

  20. 11th grade

    summary of discovering tut the saga continues

  21. AP Chemistry 2

    which combination of electronic geometries: I. linear II. trigonal planar III. tetrahedral IV. trigonal bypyramidal V. octahedral include all of the molecular geometries with pyramidal structures? Options: 1. II, III, IV, and V. 2. III and IV 3. III, IV,

  22. Chemistry UPDATED QUESTION

    A sample of air contains 78.08% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 35 degrees C and 1.00 atm? Gases to solve for: N2, O2, CO2, and Ar

  23. MATH

    use these facts to find the equation for the circle center (0,0), radius=6 a)x2-y2=36 b)x2+y2=36 c)x2-y2=6 d)x2+y2=6

  24. Physics

    A 51-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 34.0° above the horizontal. If the tension in the rope is 115 N, how much work is done on the crate to move it 9.7 m

  25. Physics

    The force shown in the figure moves an object from x = 0 to x = 60 m, where the interval between vertical dashed lines is 20 m. (a) How much work is done by the force? (b) How much work is done by the force if the object moves from x = 20 to x = 60 m? (IN

  26. Science - biology

    If you did not know whether brown or yellow alleles were dominant in corn, how could you tell with reasonable certainty? If you used a punette square to find out which one is dominant, how would you know which letters to use for each parent to figure out

  27. algebra

    siplify the expression 1/4(6b +2) - 2/3(3b-2)

  28. math

    what is the distance between the points (-1,7) and (5,7)?

  29. math

    weighted coin has property that heads comes up 60 percent of time. two flips of coin is it more likely that outcome from two flips are the same or outcome from two flips are different?

  30. geometry

    An isosceles triangle has a perimeter of 147 inches.Each of the two equal lenghts is three times as long as the base.find the length of the base

  31. geometry

    A pipe is 30 ft long with a radius of 2ft.What is the maximum volume

  32. Chem

    0.600 L of Ar at 1.20atm and 227C is mixed with 0.200 L of O2 at 501 torr and 127 C in a 400ml flask at 27C. What is the pressure in the flask?

  33. EARTH SCIENCE

    How are carbon dioxide and other trace gases thought to be potentially related to global warming? Are the levels of these gases in our atmosphere increasing or decreasing? Why? Finally, what are some of the observed climatic trends and possible

  34. Chemistry

    Calculate the theoretical pH after 2.50 mL and 9.50 mL of NaOH has been added in both the titration of HCl and of HC2H3O2. Indicate if the volume of NaOH is before or after the equivalence point. Compare these theoretical values with the actual values

  35. health

    how does your organization communicate quality awareness?

  36. health

    components of health communication

  37. CHEMISTRY

    One mole of H2O(g) at 1.00 atm and 100 degrees C occupies a volume of 30.6 L. When one mole of H2O(g) is condensed to one mole of H2O(l) at 1.00 atm and 100 degrees C, 40.66 kJ of heat is released. If the density of H2O(l) at this temperature and pressure

  38. medical language

    summarize the functions of the muscles.

  39. Chemistry 2

    Consider the system I2 (g) 2I (g) with H=+151 KJ. Suppose the system is at equilibrum at 1000 degree celsius. In which way will the reaction occur under each of the following conditions? 1. 1 atoms are added? 2. The temperture is increased? 3. The

  40. Economics

    Numerous times is history, the courts have issued consent decrees requiring large companies to break up into smaller competing companies for violating the antitrust laws, The two best known examples are American telephone and telegraph (AT&T) in the 1980s

  41. Economics

    The Federal Reserve board of governors has power to raise or lower short-term interest rates. Between 2005 and 2006, the fed aggressively increased the benchmark federal funds interest rate from 2.5 percent in February 2005 to 2.5 percent in June 2006.

  42. math

    What is the basic principle that can be used to simplify a polynomial? Isn't that factoring?

  43. Economics

    The Federal Reserve board of governors has power to raise or lower short-term interest rates. Between 2005 and 2006, the fed aggressively increased the benchmark federal funds interest rate from 2.5 percent in February 2005 to 2.5 percent in June 2006.

  44. chemistry

    how many grams of NaOH are contained in 250 mL of a 400 M sodium hydroxide solution

  45. math

    The quadratic relation Ax^2 +Cy^2 +Dx + Ey + F is graphed. the values of the x-intercepts of the graph are dependant on the values of the paramters a) A and D only b) C and E only c) C,E and F only d) A,D and F only

  46. statistics

    Among the contestants in a competition are 44 women and 26 men. if 2 winners are randomly selected, what is the probabilty that they are all men?

  47. math

    An exponential function "f" is defined by f(x)=7(1.5)^x-6. if f(k)=91, then what is the value of k?

  48. Statistics

    Which of the following statements are correct? 1.A normal distribution is any distribution that is not unusual. 2.The graph of a normal distribution is bell-shaped. 3.If a population has a normal distribution, the mean and the median are not equal. 4.The

  49. Physics 121 HW

    A sign has a mass of 1050 kg, a height h = 1 m, and a width W = 4 m. It is held by a light rod of length 5 m that is perpendicular to a rough wall. A guy wire at 23° to the horizontal holds the sign to the wall. Note that the distance from the left edge

  50. Chemistry

    An atom emits a photon of light with a wavelength of 566 nanometers. How much energy has the atom lost? Answer in units of Joules.

  51. Healthcare Administration

    Describe how you will use healthcare terminology / vocabulary in your current degree plan once you have graduated.

  52. physics hw need help

    A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at q0 = -90°. The disk then undergoes constant angular acceleration. After accelerating for 3.1 s, the

  53. Chemistry

    Just WHO IS DRBOB222? AND WHY ARE YOU SO AMAZING? PLEASE TELL US MORE ABOUT YOURSELF!

  54. ChemISTRY (WEBWORK)

    A student measures the potential for cells containing A+B+and C+ ions and their metals and records his data in the table below: ............. Overall Reaction ................Potential (V) Cell#1'''''''A(s) A+(aq) B+(aq) B(s)''''''''''''0.90

  55. Algebra II

    Ida and Ron make doughnuts for the Homestyle Bakery. The order for Tuesday is two trays of glazed doughnuts and one tray of cinnamon rolls. If each tray contains 3 dozen items, how many pastries do they need to prepare?

  56. Chemistry

    how much carbon is in 365 grams of dicarbon tetrachloride?

  57. chemistry

    If the Kf value is known to be 2.0 x 10^3. The experimental values for Kf were found to be 1.0 x 10^3, 2.0 x 10^3, 3.0 x 10^3, 1.5 x 10^3 and 1.0 x 10^3. Using the absolute values of differences, calculate the average deviation from Kf. Please show me the

  58. Science

    Should humans strive to preserve a representative sample of all biomes or aquatic zones? Why should humans be concerned with the extinction rate?

  59. Written Communication

    Can someone help me Pleaseeeee….on a writing assignment? I need to write introduction paragraphs on these Topics…My title: Positive Ways to Discipline Children. Thanks • Positive Discipline (Pattern of development: Description) • Positive

  60. english

    I would be very greateful if any one correct this sentence/improvement. Before holding any task, we should develop good character and only after following the path of god, then only we acquire good character.

  61. MATH

    Fely is twice as old as Mary. Five years hence, she will be 10 years older than Mary. Find the current age of each girl. With solution.

  62. math

    The quadratic relation Ax^2 +Cy^2 +Dx + Ey + F is graphed. the values of the x-intercepts of the graph are dependant on the values of the paramters a) A and D only b) C and E only c) C,E and F only d) A,D and F only

  63. health

    • Post a 200- to 300-word response to the following: Compare cost control strategies of employer-sponsored health plans, in which employers buy from insurance companies, to self-funded health plans, in which employers cover costs of benefits. Include the

  64. math. help please!!

    Using only the digits 0 an 1, how many different numbers consisting of 8 digits can be formed?

  65. English

    I need ideas to write an introduction about Positive Discipline for Childern in the Descriptive Pattern of development? Thanks

  66. other

    some child psychologists have concluded that___ is the strongest predictor of both scholastic and career achievement A. physical illness b. respect for authority c. emotional well being d inherited intelligence

  67. 2010 BP oil spill

    How did the oil pipeline leak in the Gulf Coast that caused this 84-day oil spill? I hope this issue will be solved soon.

  68. Physics

    I think that for energy of a spring I should use (1/2)(k)(x^2) and (1/2)(m)(v^2) but i'm not sure what to do with the equations to solve the problem. A cylindrically shaped piece of collagen is being stretched by a force that increases from 0 to 3.0 x

  69. Math (Bob Pursley

    i asked about stationary points which came out at (x-3) and (x+1) i am now trying to use the first derivative test to classify the left hand point... (x-3) so picking an xL point of -4 and an xR point of -1 i get this f ' (-4) = 3 16 - 4 + 9 = 48 - 24 + 9

  70. physics

    1. Two point charges are separated by 6 cm. The attractive force between them is 14 N. Find the force between them when they are separated by 12 cm. 2. The SI unit of mass is the kilogram. What is the SI unit of charge? 3. The proportionality constant k in

  71. chemistry

    calculate [H30+],pH,[OH-] and pOH for .025 M nitric acid (HNO3)??

  72. FINANCE

    You are graduating in September and would like to start your own business making wine coolers. You collect the following information on the initial costs: Cost of Plant & Equipment = $500,000 Licensing & Legal Costs = $50,000 You also have been left a tidy

  73. sci275

    Loss of agricultural land

  74. Physics HELP

    A railroad car with a mass of 2000kg is rolling at a speed of 15m/s. What force would be required to stop the car in 10 seconds? a)13.3 N b)2,000 N =c)3,000 N d)30,000 N

  75. math

    is 9x^2-36x+25 a perfect square? the answer is no

  76. Physics

    On December 26, 2004, a great earthquake occurred off the coast of Sumatra and triggered immense waves that killed hundreds of thousands of people. Satellites observing these waves from space measured 800 km from one wave crest to the next and a period

  77. Physics HELP

    When do you get the greatest impulse or change in momentum? a)When an object fully stops upon impact b)When an object merely slows down after impact c)When an object bounces back after impact d)All incidents have the same impulse It doesn't clearly say in

  78. Math

    What is 34920421-98349238

  79. Psychology

    I am trying to identify four key milestones in cognitive psychology

  80. finance

    Your best taxable investment opportunity has an EAR of 4%. Your best tax-free investment opportunity has an EAR of 3%. If your tax rate is 30%, which opportunity provides the higher after-tax interest rate?

  81. math

    if a set of index cards are labeled with the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. one card is drawn, find the probability that it is an even number

  82. physics

    1. At some automobile toll-collecting stations, a thin metal wire sticks up from the road and makes contact with cars before they reach the toll collector. What is the purpose of this wire? 2. The leaves of a charged electroscope collapse in time. At

  83. physics

    How can you charge an object negatively with only the help of a positively charged object?

  84. geometry

    suppose that two opposite verticles of a rhombus are joined by a straight line.what are the figures into which ti is divided.

  85. geometry

    if a driver is headed in a westerly direction and makes a 90 degree turn,what is his new direction

  86. economics

    you find out that your aunt works for a defense manufactuing compnay that has several defense contracts with the government. she tells you that she works for a team that is producing a communications satellite. what kind of good is that; individual, merit,

  87. english

    what does it mean when it says 'write a precis of the poem.' what is a precis?

  88. Geometry

    Hi, I have to use algebra to find the coordinates of the point where two lines intersect, the first line passes through the points 4,3 and 10,0 and the second line is y=6. Any ideas would be very much appreciated, many thanks

  89. math

    i can help you tan. would you like to take my help.

  90. Physics 121

    A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 2.7 m down a q = 23° incline. The sphere has a mass M = 4.8 kg and a radius R = 0.28 m. a) Of the total kinetic energy of the sphere, what fraction is

  91. accounting

    What are the different criteria for recognizing revenue?

  92. General Chemistry

    What happens to the rate of evaporation of a liquid after… a. a decrease in temperature b. an increase in the surface area of a liquid exposed to air c. an increase in the intermolecular forces

  93. A 3.5 kg block, initially in motion, is pushed along a horizontal floor by a force F of magnitude 17 N at an angle θ = 35° with the horizontal (Figure 6-20). The coefficient of kinetic friction between the block and floor is 0.25. (Assume the positive

  94. physics

    A 3.5 kg block, initially in motion, is pushed along a horizontal floor by a force F of magnitude 17 N at an angle θ = 35° with the horizontal (Figure 6-20). The coefficient of kinetic friction between the block and floor is 0.25. (Assume the positive

  95. physics

    In a pickup game of dorm shuffleboard, students crazed by final exams use a broom to propel a calculus book along the dorm hallway. If the 3.5 kg book is pushed from rest through a distance of 0.77 m by the horizontal 25 N force from the broom and then has

  96. physics

    A 17 N horizontal force F pushes a block weighing 3.0 N against a vertical wall. The coefficient of static friction between the wall and the block is 0.65, and the coefficient of kinetic friction is 0.45. Assume that the block is not moving initially. (a)

  97. physics

    Calculate the ratio of the drag force on a passenger jet flying with a speed of 850 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at three-fifths the speed and half the altitude of the jet. At 10 km the density of air is

  98. english

    I NEED HELP WRITING A PROCESS PARAGRAPH ON HOW TO MAKE A CAKE AND I HAVE THE STEP BUT I JUST DON'T KNOW HOW TO WRITE THE PARAGRAPH. HERE ARE THE STEPS:Making a Cake: A Process Example Here’s a sample list for How to Bake a Cake: assemble ingredients mix

  99. physics 121 hanging sign

    A sign has a mass of 1050 kg, a height h = 1 m, and a width W = 4 m. It is held by a light rod of length 5 m that is perpendicular to a rough wall. A guy wire at 23° to the horizontal holds the sign to the wall. Note that the distance from the left edge

  100. Chemistry

    It takes about 10^16 years for just half the samarium-149 in nature to decay by alpha-particle emission. Write the decay equation, and find the isotope that is produced by the reaction.

  101. Exponential model

    Hi, I have a exponential model of P = 5.3 x (1.11)^t. I need to use this model to predict when a bird population will first exceed 500 pairs, so P is the number of pairs and t is the year. I have already come to an answer of 44 years but I think this is

  102. sociology

    • How does studying social institutions help sociologists understand society?

  103. Physics

    Calculate the power output of a 1.5 fly as it walks straight up a windowpane at 2.2 P=__W (2 sig figs)

  104. Physics

    Calculate the power output of a 1.5 fly as it walks straight up a windowpane at 2.2 2 sig figs P= ___W

  105. Math

    Explain why this statement is true: when simplifying rational expressions, we must cancel factors only, and not terms. Give an example using just numbers.

  106. Res.

    A two-tailed hypothesis test at the 5 percent level of significance (£\ = .05) is exactly equivalent to asking whether the 95 percent confidence interval for the mean includes the hypothesized mean. If the confidence interval includes the hypothesized

  107. math

    from an ordinary deck of 52 cards, a single card is selected random. what is the probability that it is a 10 or red card?

  108. Math

    If I send 7,855.00 in the form of a cashier's check to Mississauga Canada for a hotel group trip, will I get any money back in American currency with the conversion? Thanks

  109. Physics

    "An athlete whirls a 3.7kg shot-put in a horizontal circle with a radius of 0.90m. If the period of rotation is 0.30s, how far would the shot-put travel horizontally if it is released 1.2m above the level ground?" There were two other parts to the question

  110. To Pavleen/Kamleen

    Please do not keep posting the same question multiple times.

  111. Physics

    Find the magnitude of the impulse delivered to a soccer ball when a player kicks it with a force of 1500 . Assume that the player's foot is in contact with the ball for 5.50×10−3 p= __kg*m/s

  112. Mat115

    This problem is in chapter 9 page 708, problem 58. It looks like it could be solved two ways. 16 div. by (-2)*(-4) --------------------- 2^ +4

  113. Mat115

    Ms. Sue that would make it 2/2to third power +4. Am I on The right track?

  114. environmental science

    reflect on ur own worldview, Provide examples of the benefits of ur view to defend ur position?

  115. Mat115

    16÷(-2)◦(-4) ______________ 2³+ 4 16÷8 _______ 8 + 4 2 = 1 12 6 There is supposed to be a line under the first part of the problem making it a fraction.

  116. MAT115

    4-(-3)+1 2-2÷(-2) There is supposed to be a fraction line in between the sets of numbers. I do not know how to make my computer underline this.

  117. HELLO

    how come no ones answering my question i waiting

  118. FINANCE

    You are graduating in September and would like to start your own business making wine coolers. You collect the following information on the initial costs: Cost of Plant & Equipment = $500,000 Licensing & Legal Costs = $50,000 You also have been left a tidy

  119. chemistry

    For the reaction Cl2(g) 2Cl)g) Kp=2.45*10^-7 at 1000K. What is delta G (degrees) for this reaction at 1000K?

  120. Literature HELP!!!

    Which phrase best describes Samuel Pepys's personality, judging from the Diary excerpts you read? A.a caring, social man with many friends B. a hardworking but miserly man who cares only about the damage the fire will cause his properties C.an angry and

  121. chemistry

    Write an equation for the combustion of one mole of benzene, C6H6(l), and use data from Appendix D to determine delta G degrees (which is 124.5) at 298K if the products of the combustion are (a) CO2(g) and H2O(l), and (b)CO2(g) and H2O(g). Describe how you

  122. college

    A quantity of ice at 0°C is added to 65.0 g of water in a glass at 55°C. After the ice melted, the temperature of the water in the glass was 15°C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol and the specific heat is 4.18

  123. medical

    a pathology report shows adenocarcinoma. what type of info should also appear on report?

  124. Psychology

    mechanistic inteactionism vs. reciprocal interactionism?

  125. latin

    Transaltion from Latin to English: Aeneas, dum ex urbe effugit, senem portat. Senex est Anchises, pater Aeneae. Portare Anchisen necesse est quod senex ambulare non potest. Aeneas Anchisen portat; portat Anchisen Penates, deos familiares. Dei Aenean et

  126. payroll accounting

    4. First Case Manufacturing Company has annual payroll of $100,000. Voluntary contribution are allowed in the State where this company does business. Total unemployment taxes paid into the State’s unemployment fund amounts to $24,000. Cumulative

  127. idk, math i guess

    if the average person drinks 8(8 oz.) glasses of warter per day,rather than a person who drinks 12 8 oz. of warter after a morning excersise session has consumed what fraction of the daily average?.

  128. AED 201

    I need help on where to go online to find the information below, I think I am missing something, because I can't find it. I have looked at the florida dept of ed., okaloosa district site and the edwins elementary site. Help!!! HEre is the question: o

  129. 7th grade

    How do I use Distributive Property to solve 10*32? I have to show my work.