Questions Asked in 2006

Most Popular Questions of 2006

  1. Chemistry

    Hi. Is PO4(3-) polar or non-polar? Why or why not? Thanks! Look up the electronegativity of P and O. I think I remember that O is about 3.5 and P is about 2.1; therefore, each P-O bond is somewhat polar. Thus, the ion will be polar unless the Lewis

    asked by Sally on November 23, 2006
  2. Economics

    An industry currently has 100 firms, all of which have fixed costs of $16 and avg. variable cost as follows: Q Avg. Variable Cost ($) 1 1 2 2 3 3 4 4 5 5 6 6 a. Compute marginal cost and avg. total cost. b. the price is $10. what is the total quantity

    asked by Maggie on December 13, 2006
  3. english

    I woul like to review my essay please? Post it. Can you please help me write that essay" A way to decrease your chance of becoming a victim of random ciolence". Hmmm. You have an assignment to write an essay, a teacher offers to review your essay, and you

    asked by louise on November 30, 2006
  4. Economics

    you are hired as the consultant to a monopolistically competitive firm. The firm reports the following information about its price, marginal cost, and average total cost. Can the firm possibly be maximizing profit? If the firm is profit maximizing, is the

    asked by Sally on December 5, 2006
  5. MATH -BRAIN TEASER- PLEASE HELP

    Page # D-74 How Would You Describe a Dead Skunk? A skunked skunk. no What kind of answers do you have for the ones you have correct? exstankt extinct

    asked by Adam on December 17, 2006
  6. Chem 1

    It takes 208.4 kJ of energy to remove 1 mole of electrons from an atom on the surface of rubidium metal. What is the maximum wavelength (in nm) of light capable of removing a single electron from an atom on the surface of rubidium metal? Ok, I know I have

    asked by Rossi on October 21, 2006
  7. Chemistry

    1) What Physical properties, other than specific heat, could you use to help identify unknown metals? 2) Why is water an excellent material to use in a calorimeter? Density, color, resistivity (or conductitivy), melting point, crystallization. 2) water is

    asked by K. on September 21, 2006
  8. physics

    THree blocks of masses 3m, 2m and m are connected to strings A,B, and C. The blocks are pulled along a rough surface by a force of magnitude F exerted by string C. The coefficient of friction between each block and the surface is the same. Which string

    asked by me on December 28, 2006
  9. Microeconomics - monopoly vs perfect competition

    This is a good and fun question that I am still scratching my head oever. We know monopoly's profit maximisation is MC=MR. We also know that perfect competition's profit maximising criteria is such that P=MC. Just what exactly does this mean? I know for

    asked by Sir Donsball on November 7, 2006
  10. Chemistry

    In a lab, we added NH3(aq) to CuSO4(aq), and the solution turned dark blue with a precipitate. The problem is that the products ( Cu(NH3)4 and SO4) should be soluble, no? The question is then, what is the percipitate? The ppt is Cu(OH)2. The dark blue

    asked by Karl on December 17, 2006
  11. Chemistry.

    Please explain how to solve this question, and why you use your method to solve it. I am very very stuck. Gold is present in seawater to the exteen of 0.15mg/ton. Assume the density of the seaswater is 1.03g/mL and determine how many Au atoms could

    asked by Philip on September 21, 2006
  12. Calculus, AntiDerivatives

    I need help with this problem: A car traveling at 43 ft/sec decelerates at a constant 5 ft per second squared. How many feet does the car travel before coming to a complete stop? I'm not sure where to start, i know how to find antiDerivatives, but i don't

    asked by Mike on November 23, 2006
  13. MATH -BRAIN TEASER- PLEASE HELP

    page # D-76 What Relation Is a Doorstep to a Doormat? Both are stepped on. no You didn't put any parameters on this and I think its a great answer. How bout the relation being a stepson (steps on) I got astearther.... No wait it's A Step Farther eh....??

    asked by Adam on December 17, 2006
  14. physics

    A student holds one end of a string in a fixed position. A ball of mass .2 kg attached to the other end of the string moves in a horizontal circle of radius .5m with a constant speed of 5m/s. How much work is done on the ball by the string during each

    asked by me on December 28, 2006
  15. PHYSICS HELP

    A 525-N trunk is placed on an inclined plane that forms an angle of 30.0 degrees with the horizontal. What are the components of the weight parallel to the plane and normal to the plane? Memorize this: weight normal = mg cosTheta weight parallel= mg Sin

    asked by Suzanne on October 16, 2006
  16. physics.

    A car travels forward with constant velocity. It goes over a small stone, which gets stuck in the groove of a tire. The initial acceleration of the stone, as it leaves the surface of the road is, a)vertically up b)horizontally forward c)horizontally

    asked by me on December 28, 2006
  17. Social Studies

    What is the real difference between 'Social Studies' and History? History is one branch of social studies. In high school, they often amount to the same thing, but "social studies" seems to be supplanting the teaching of chronolgical history. Other

    asked by Julie L. on August 20, 2006
  18. history

    Why, when, and where did Abraham Lincoln say "What kills a skunk is the publicity it gives itself." ? Thanks. Since this is not my area of expertise, I searched Google under the key words "Abraham Lincoln Skunk quote" to get possible sources. I got over 15

    asked by April on October 15, 2006
  19. math/unit rate

    please help me find the definition for unit rate. It depends upon what kind of unit. Go to www.google.com and type in unit rate. There is one source there for hotel unit rates, another for unit rates for the medical field, etc. You may also go to

    asked by hannah on September 26, 2006
  20. Calc

    A car traveling at 43 ft/sec decelerates at a constant 5 feet per second squared. How many feet does the car travel before coming to a complete stop? i tried a few different equations, none of the worked. 43t - 5t^2 = 0 43 - 10t = 0 21.5t^2 - (5/3)t^3 = 0

    asked by Norris on November 23, 2006
  21. calc help showed work

    If the function f has a continuous derivative on [0,c], the the integral(o to c) of f'(x)dx= a)f(c)-f(0) b)absolute value (f(c)- f(0)) c) f(c) d)f'(x)=c e)f"(c)-f"(0) My work: so the the answer to the integral is f(x) and when find the answer from o t0 c,

    asked by david on December 7, 2006
  22. English

    I need help trying to construct an Extended metaphor. The topic being People who use cell phones while a movie is going on. Please help thanks . Thank you for using the Jiskha Homework Help Forum. The first thing to understand is the definition of an

    asked by chris on August 23, 2006
  23. Chemistry

    Compounds like CCL2F2 are known as chloroflourocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is

    asked by Jenn on December 14, 2006
  24. Econ.

    In recent years, some policymakers have proposed requiring firms to give workers certain fringe benefits. For example, in 1993, President Clinton proposed requiring firms to provide health insurance to their workers. Let’s consider the effects of such a

    asked by Jenny on December 4, 2006
  25. Microeconomics

    Four roommates are planning to spend the weekend in their dorm room watching old movies, and they are debating how many to watch. Here is their willingness to pay for each film: Orson Alfred Woody Ingmar Frist film 7 5 3 2 Second film 6 4 2 1 Third film 5

    asked by Jeff on September 29, 2006
  26. Chemistry!

    When 2.5g of NaOH were dissolved in 49.0g water in a calorimeter at 24.0 C, the temperature of the solution went up to 37.1 C. a. Is the solution reaction exothermic? Why? The temperature or the water went from 24.0 to 37.1 which is an increase. If the

    asked by DrBob222 on December 4, 2006
  27. Economics

    3. Suppose the Clean Springs Water Company has a monopoly on bottled water sales in California. If the price of tap water increases, what is the change in Clean Springs' profit-maximizing level of output, price, and profit? Explain in words and with a

    asked by Mariah on December 3, 2006
  28. Calculus

    The line that is normal to the curve x^2=2xy-3y^2=0 at(1,1) intersects the curve at what other point? Please help. Thanks in advance. We have x2=2xy - 3y2 = 0 Are there supposed to be 2 equal signs in this expression or is it x2 + 2xy - 3y2 = 0 ? I'll

    asked by Jen on October 15, 2006
  29. Microeconomics

    Larry, Moe, and Jo run the only saloon in town. Larry wants to sell as many drinks as possible without losing money. Jo wants the saloon to bring in as much revenue as possible. Moe wamts to make the largest possible profits. Using a single diagram of the

    asked by Alex on December 8, 2006
  30. Economics

    3. Suppose the Clean Springs Water Company has a monopoly on bottled water sales. If the price of tap water increases, what is the change in Clean Water’s profit-maximizing levels of output, price, and profit? Explain in words and with a graph. Take a

    asked by Sally on December 1, 2006
  31. finding c: calc

    let f(x)=square root x. if the rate of change of at x=c is twice its rate of change at x=1, then c=? what???? i don't get get it. to begin with, i took the derivative if that helps which is 1/(2*sqrtx) . f'(x) = 1/(2*sqrtx) is correct f'(x=1) = 1/2 The

    asked by david on December 5, 2006
  32. Physics

    A small first-aid kit is dropped by a rock climber who is descending steadily at 1.9 m/s. After 2.5 s, what is the velocity of the first-aid kit, and how far is the kit below the climber? My question is, how can you determine how fast/far the kit is

    asked by Help again?? Becca on September 17, 2006
  33. HELP!

    Name and explain 3 problems of the Articles of Confederation. What is this question mean? and someone please give me some good site. i learned that last year the articles of confederation were one of the first governments after the revolution name three

    asked by cc on October 19, 2006
  34. Math

    The Garraty company has two bond issues outstanding. Both bonds pa $100 annual interest plus $1,000 at maturity. Bond L has a maturity of 15 years and Bond S a maturity of 1 year. A). What will be the value of each of these bonds when the going rate of

    asked by Dee Dee on June 17, 2006
  35. HELP!

    What caused states to demand a constitutional Convention and explain why? What three issues caused the most conflict during the Constitutional Convention and why? How did the COnstitutional delegates solve these problems? Plese tell me good site and teach

    asked by cc on October 19, 2006
  36. Phase diagram

    Question: A solid substance has a vapor pressure of 800 mm Hg at its melting point (80 degrees C). Describe how the solid behaves as temperature is raised from room temperature to 80 C while the atmospheric pressure is held constant at 760 mm Hg. I think

    asked by Sheryl on November 12, 2006
  37. Linear Approximation

    Use linear approximation, i.e. the tangent line, to approximate 1/0.104 as follows: Let f(x)=1/x and find the equation of the tangent line to f(x) at a "nice" point near 0.104 . Then use this to approximate 1/0.104 . L(x)=f(a)+f'(a)(x-a)...i think. You're

    asked by Jojo on October 14, 2006
  38. phyiscs

    How do I do these? Draw a free-body diagram for each of the following objects? a. a projectile in motion in the presence of air resistance b. a rocket leaving the launch pad with its engines operating c. a heavy crate being pushed across a rough surface a.

    asked by Anonymous on December 5, 2006
  39. english

    Who is the intended audience for the novel The Scarlet Letter? That is a good question. He wrote of historical times, of sin, guilt, and repentance. He wrote of social mores, social pressure, and the pain of reconciling this with personal morals. I think

    asked by anonymous on October 26, 2006
  40. Physics

    A 50.0 kg parachutist jumps out of an airplane at a height of 1.00 km. The parachute opens, and the jumper lands on the ground with a speed of 5.00 m/s. By what amount was the jumper's mechanical energy reduced due to air resistance during this jump? so,

    asked by Becca on December 5, 2006
  41. calculus

    If y is a differentiable function of x, then the slope of the tangent to the curve xy - 2y + 4y^2 = 6 at the point where y=1 is ...... How do I do this? Thanks. xy - 2y + 4y^2 = 6 ---> d[xy - 2y + 4y^2] = 0 ---> xdy + ydx - 2dy + 8ydy = 0 ---> (x + 8y -

    asked by Jen on December 3, 2006
  42. Chemistry

    You made 100.0 ml of a lead (II) nitrate solution for lab but forgot to cap it. The next lab session you noticed that there was only 80.0 ml left. In addition, you forgot the initial concentration of the solution. You decide to take 2.00 ml of the solution

    asked by Anonymous on October 30, 2006
  43. The lord of the flies-English

    Why is percival unable to remember his name and address? Please help!! :( He is one of the "littleuns". He is so traumatized by the events he lives through that he forgets what civilization is about, including his name.

    asked by Help! on December 3, 2006
  44. science

    Written out, would the reaction between anihiline [C6H5NH2] and perchloric acid look like this: C6H5NH2 + HClO4 -> C6H5ClO4 + HNH2 ? The NH2 group on aniline is basic. It takes on a H^+ from HClO4 and forms the salt. The salt is C6H5NH3^+ + ClO4^-. I hope

    asked by Crystal on October 19, 2006
  45. word unscramble

    need help unscrambling a word or words tarluna what is it HELP ME UNSCRAMBLE THESE LETTERS TO MAKE A WORD THAT PERTAINS TO SPACE AND IS A P POSSESSIVE NOUN. SEGHRTMLAN J'aodredefis Please post the word or words you need to unscramble, and we'll try to help

    asked by amy on September 28, 2006
  46. History

    My question is Egyptian portrait masks were often made of this material? Egyptian portrait or funeral masks were made of wood, plaster, cartonnage, or even precious metals such as gold. This site has more information.

    asked by Rilee on October 16, 2006
  47. Chem 12

    How can I do this: 3KNO3(aq)+ Fe(SCN)3(aq) + NaOH(aq) ? what do you have to do? write the products it makes. I don't know the products it makes. I have to figure out what adding all those produces. Im not sure its even possible? yes it is possible. first

    asked by Nick on December 3, 2006
  48. PHYSICS HELP

    A team of dogs is pulling a sled that has a load of 2500 kg at a constant speed of 5.0 m/s. The coefficient of kinetic friction between the sled and the snow is 0.10. What is the horizontal force the dogs are exerting on the loaded sled? The horizontal

    asked by Suzanne on October 16, 2006
  49. ALGEBRA 1!PLZ HELP!

    Use the Substitution method to solve the system of equations. y - 2x = -5 3y - x = 5 Solve the first equation for y. y = 2x-5 Substitute that for y in the second equation and solve for x. Then use the value of x to substitute back into the first equation

    asked by SANDRO! on November 6, 2006
  50. Drug Abuse and Addiction

    I need research sources for drug abuse and addiction. Thank you. Check these sources -- http://www.nida.nih.gov/ http://teens.drugabuse.gov/ (Broken Link Removed) http://www.drugabusestatistics.samhsa.gov/

    asked by Brian on November 12, 2006
  51. Economics

    6. Show the effect of each of the following events on the market for labor in the computer manufacturing industry. Use graphs. a. Congress buys personal computers for all American college students. Wouldn't the demand curve shift to the right while the

    asked by Mariah on December 4, 2006
  52. Economics

    1. Your roommate's long hours in chem lab finally paid off--she discovered a secret formula that lets people do an hour's worth of studying in 5 minutes. So far, she's sold 200 doses and faces the following average-total-cost schedule: Q = 199 & ATC = $199

    asked by Mariah on November 19, 2006
  53. Chemistry

    A spherical glass container of unknown volume contains helium gas at 25C and 1.960 atm. When a portion of the helium is withdrawn and adjusted to 1.00 atm at 25C, it is found to have a volume of 1.75 cm^3. The fas remaining in the first container shows a

    asked by Mewtwo on September 30, 2006
  54. Last physics help question (my thoughts given)

    A 160-N child sits on a light swing and is pulled back and held with a horizontal force of 100N. The tension force of each of the two supporting ropes is: a) 60N b) 94N c) 120N d) 190N e) 260N work: weight is down, the pull is back, so the tension must act

    asked by diane on December 11, 2006
  55. social studies

    i need to know what is on the blank of peninsula? I don't understand your question. Please clarify. A peninsula is land that is surrounded on three sides by water. Most of Florida is a peninsula.

    asked by sarah on September 19, 2006
  56. AP chem

    It takes 208.4 kJ of energy to remove 1 mole of electrons from atom on the surface of rubidium metal. How much energy does it take to remove a single electron from an atom ont eh surface of solid rubidum? What is the maximum wavelength of light capable of

    asked by beth on October 1, 2006
  57. Low recovery

    The question is: A student performs a crystallization on an impure sample of biphenyl. The sample weighs 0.5g and contains about 5% impurity. Using his knowledge of solubility, he decides to use benzene as a solvent. The final weight is only 0.02g. Why is

    asked by Sheryl on September 26, 2006
  58. graphing, math

    How do you graph these types of problems. Graph each of the following inequalities. 4x + y (grater than or equal to) 4 Get y by itself on one side and then graph and shade the region depending on the sign (< or >) and make the line dotted if it is not

    asked by jasmine20 on December 26, 2006
  59. physics

    A student is testing the kinematic equations for uniformly accelerated motion by measuring the time it takes for light-weight plastic balls to fall to the floor from a height of 3 m in the lab. The student predicts the time to fall using g as 9.8 m/s^2 but

    asked by me on December 28, 2006
  60. Chemistry

    Can you please answer this question: Both water and carbon dioxide are triatomic molecules. Explain why one of these molecules is polar and the other is nonpolar? Carbon dioxide is linear :C::O::C: and therefore has no net electrical dipole. Water is a

    asked by Beautiful on December 16, 2006
  61. chemistry

    Can someone help me with this? 1)What new element is formed if magnesium-24 is bombarded with a neutron and then ejects a proton? Write a balanced nuclear equestion for this transmutation. Is this beta decay? That's what I'm thinking, but I'm not sure. It

    asked by Alexander on December 18, 2006
  62. Physics

    You have landed on an unknown planet, Newtonia, and want to know what objects will weigh there. You find that when a certain tool is pushed on a frictionless horizontal surface by a 12.2 N force, it moves 16.3 m in the first 2.30 s, starting from rest. You

    asked by Veronica on September 19, 2006
  63. PHYSICS

    A car is traveling 27 m/s when the driver sees a child standing in the road. He takes 0.8 s to react, then steps on the brakes and slows at 8.0 m/s2. How far does the car go before it stops? please help!! Since he's going 27 m/s, and he takes 0.8 s to

    asked by Katelyn on September 26, 2006
  64. AP chem

    I have a problem set due tomorrow, and two problems in it were not covered in class. The first is this: Molybdenum has an atomic radius of 0.145 nm. The volume of its cubic unit cell is 0.0375 nm^3. What is the geometry of the molybdenum unit cell? I have

    asked by chris on December 7, 2006
  65. Same substances?

    Question: Two substances, A and B, have the same melting point. how can you determine if they are the same without using any form of spectroscopy? Explain in detail. My answer: Perform a mixture melting point. In this procedure, pulverize and mix A and B

    asked by Sheryl on October 1, 2006
  66. Salem Witch Trials

    how do historians interpret theses events? do they think they were necessary in order for the society to advance No. The witch trials were an aberration and took a step backward in the advancement of society. They attempted to blame a scapegoat for

    asked by blah on September 4, 2006
  67. need help with 2 physics problems

    1. While following the directions on a treasure map, a pirate walks 45.0 m north, then turns and walks 7.5 m east. What single straight-line displacement could the pirate have taken to reach the treasure? 2. A hummingbird flies 1.2 m along a straight path

    asked by Anonymous on October 4, 2006
  68. Economics

    10. An industry currently has 100 firms, all of which have fixed cost of $16 and average variable cost as follows: Quantity / Average variable cost: (1/$1),(2,$2), (3,$3), (4,$4), (5,$5), and (6,$6) b. The price is currently $10. What is the total quantity

    asked by Mariah on November 28, 2006
  69. ap chemistry

    Discuss briefly the relationship between the dipole moment of a molecule and the polar character of the bonds within it. WIth this as a basis, account for the difference between the dipole moments of CH2F2 and CF4. does anyone have any idea? the greater

    asked by someone on December 7, 2006
  70. English

    Could you paraphrase this sentence for me? His wish was to keep his country's independence from the United States. It's best if YOU do the paraphrase and then post what you write. Someone here will give you feedback. To paraphrase, cover the sentence and

    asked by Vanssa on December 9, 2006
  71. organic chemistry!

    Just wanted to know if I have named the following compounds correctly..and wanted to know if there are any short-hand or easier methods of naming organic compounds because they are a bit confusing!I tried drawing structural formulas for the following as

    asked by michelle on December 27, 2006
  72. Analogies (just one)-- please help

    Smile is to compare as hyperbole is to ____________ exaggerate procession equipped possibility I thought something was awry. Simile means to compare and hyperbole means to exaggerate. Did you try dictionary.c o m? This is easy, a simile is a comparison and

    asked by Anonymous on September 14, 2006
  73. physics

    Give two examples of ways that physicists model the physical world. I was wondering if this would be an effective answer for "give two examples of ways that physicists model the physical world." 1. Physicists build computer simulations. 2. They build

    asked by Anonymous on August 22, 2006
  74. chemistry

    Write out the net ionic equation for: Cd(NO3)2 + Na2S -----> 2NaNO3 + CdS ----- thanks!! Write out the net ionic equation for: Cd(NO3)2 + Na2S -----> 2NaNO3 + CdS If this is done in a water solution, then the sodium nitrate will be in solution, as was the

    asked by Tessa on September 12, 2006
  75. math againn (converting decimals)

    Write 6.4% as a decimal and as a fraction. Write 2 and one fourth as a decimal and as a percent. To convert from percent to decimal simpoy divide by 100. 6.4% = 0.064. To convert to fraction (do you want a mixed fraction or not? and percent or not?). For a

    asked by Rebecca on August 22, 2006
  76. Physics help--explosion

    Figure 9-56 shows a two-ended "rocket" that is initially stationary on a frictionless floor, with its center at the origin of an x axis. The rocket consists of a central block C (of mass M = 6.00 kg) and blocks L and R (each of mass m = 2.90 kg) on the

    asked by fizzix on December 2, 2006
  77. GEOGRAPHY / SCIENCE

    The theory that addressed the apparent ability of landmasses to move through the crust is called Continental Drift? I think this is the answer but not sure. Please help Yes, You're right. The Continental Drift theory is based on plate tectonics.

    asked by Suzanne on October 15, 2006
  78. closing off first quadrant

    You are planning to close off the corner of the first quadrant with a line segment 20 units long running from (a,0) to (0,b). Show that the area of the triangle enclosed by the segment is largest when a=b From applications of derivatives...this is really

    asked by Jen on November 18, 2006
  79. economics

    Suppose that people consume only three goods, as shown in this table: (5 Marks) Tennis Balls Tennis Racquets Gatorade 1998 price $2 $40 $1 1998 quantity 100 10 200 1999 price $2 $60 $2 1999 quantity 100 10 200 What is the percentage change in the price of

    asked by shelby on September 25, 2006
  80. history

    How did Jeffersonian Democracy hope to remove obstacles to upward social mobility? How is it different from Jacksonian Democracy? Jeffersonian Democracy: http://en.wikipedia.org/wiki/Jeffersonian_democracy and

    asked by emma on October 7, 2006
  81. Chem

    A bicycle tire is filled with air to a pressure of 100 psi at a temperature of 19C. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58C. The volume increases by 4%. What is the new pressure of the tire? Convert the temps to

    asked by Mew on September 30, 2006
  82. Math

    Can someone correct them 5) Write fraction as a percent 7/8 My answer: 0.875=87 1/2% 6)Write each decmal as a percent 0.008 My answer:8% 7) Write as a decimal 160% My answer:1.60 8)Write as a fraction 52% My asnwer:5/10 5) Write fraction as a percent 7/8

    asked by Jasmine 20 on November 24, 2006
  83. A.P Chemistry

    A rigid 5.00 L cylinder contains 24.5g of N2(g) and 28.0g of O2(g). (a). Calculate the total pressure, in atm, of the gas mixture in the cylinder at 298 K (b) The temperature of the gas mixture in the cylinder is decreased to 280 K. Calculate each of the

    asked by Brianna on October 22, 2006
  84. Chemisrty

    Would Flame test be useful for detecting metal ions present in a mixture of metal ions?? It is not a reliable method. Atomic spectroscopy would be much more accurate and sensitive than the human eye. To add to the information provided by Bob Pursely, which

    asked by Bryan on October 23, 2006
  85. Probability

    A department store has determined that 25% of all their sales are credit sales. A random sample of 75 sales is selected and the proportion of credit sales in the sample is computed. a) What is the probability that the same proportion will be greater than

    asked by Janice on November 23, 2006
  86. Law of Multiple Proportions

    Two elements, R and Q, combine to form two binary compounds. In the first compound, 14.0 g of R combines with 3.00 g of Q. In the second compound, 7.00 g of R combines with 4.50 g of Q. Show that these data are in accord with he law of multiple

    asked by Shell on November 14, 2006
  87. physics

    An object at rest explodes into three pieces of equal mass.One moves east at 20.0 m/s,a second moves southeast at 30.0 m/s. What is the velocity of the third piece? The vector sum of the momenta of the three pieces must be zero, since it was zero to begin

    asked by miss sixty on September 23, 2006
  88. science

    When water mixes with carbon dioxide in the air, what is formed? H2O + CO2 --> H2CO3 carbonic acid I don't think this is correct because there is no aid in co2. It just ends up to be CO2 in liquid form. Basically water with air is carbonated water. that is

    asked by jeff on December 7, 2006
  89. Physics

    A car with good tires on a dry road can decelerate at about 5.0m/s/s when braking. If the car is traveling at 55miles/hour, how much time does it take the car to stop? 55 mph = 80.7 ft/s = 24.6 m/s Divide the initial speed by the deceleration rate to get

    asked by Savannah on September 18, 2006
  90. Economic

    Suppose that labor is the only input used by a perfectly competitive firm that can hire workers for $50 per day. The firm’s production function is as follows: Days of Labor/Units of Output: 0/0, 1/7, 2/13, 3/19, 4/25, 5/28, 6/29, 7/29 c. Compute the

    asked by Mariah on December 4, 2006
  91. physics

    A firefighter of mass 120 kg slides down a vertical pole with an acceleration of 4 m/s per second. What is the friction force that acts on the firefighters? In this case, the friction force is the force that is acting against gravity. Use F=M*a If

    asked by kelly on September 20, 2006
  92. Physics

    A sphere of mass 3.0X10^-4 kg is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes a constant angle of 37 degrees with the vertical. find a) the magnitude of that push and b) the tension of the cord. I looked

    asked by Amy on November 12, 2006
  93. Watershed?

    What parts of the environment, natural and manmade, make up a watershed? Watersheds aren't really important to humans in and of themselves, it is the amount of precipitation what is caught up within the watershed. Look at Brazil in an atlas. The Amazon has

    asked by Anonymous on November 1, 2006
  94. TLC purity

    Question: A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which the Rf value is 0.95, is observed. Does this indicate that the unknown material is a pure compound? What can be done to verify

    asked by Sheryl on October 13, 2006
  95. Pre-Calculus

    The formula D= 5e ^-0.4h can be used to find the number of milligrams D of a certain drug that is in a patient's bloodstream h hours after the drug has been administered. When the number of milligrams reaches 2, the drug is to be administered again. WHat

    asked by Erica on October 10, 2006
  96. PHYSICS PLEASE HELP QUICK

    An object with an initial speed of 4.0 meters per second accelerates uniformly at 2.0 meters per second2 in the direction of its motion for a distance of 5.0 meters. What is the final speed of the object? Vi=4m/s a=2.0m/s*s d=5.0m Vf=? Vf©÷=Vi©÷+2ad

    asked by Katelyn on October 5, 2006
  97. Physics

    A shopper in a supermarket pushes a loaded 32 kg cart with a horizontal force of 12 N. How far will the cart move in 3.5 s if the shopper places an 85 N child in the cart before pushing? I don't know how I can add the 85 N to the 32 kg or if I can or how

    asked by Becca on November 14, 2006
  98. Mobility and Rf

    We did a column chromatography then a TLC on extracted spinach pigments. Question: Why are the chlorophylls less mobile on column chromatography and why do they have lower Rf values than the carotenes? My answer: The chlorophylls are more polar than the

    asked by Sheryl on October 22, 2006
  99. SCIENCE

    WHAT HAPPENS IF EARTH'S MINERALS ARE USED UP? Will more grow or will there be no more Some minerals are being formed all the tme; others are not and will die out, so to speak, or be redustributed and any one site will be too small to pay to mine.

    asked by ALEXIS on December 11, 2006
  100. physics question

    I have a question about a problem regarding Newton's third law. a. An iron rod is held up by a magnet. The magnet is held up by a string (from a ceiling, let's say). Draw a free-body diagram for the magnet and a separate free-body diagram for the iron rod.

    asked by Kim on November 21, 2006