Most popular questions and responses by TP
  1. Physics

    Sam, whose mass is 76kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 220N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 15s . How far has Sam traveled when he

    asked on May 11, 2014
  2. Chemistry

    For the reaction I2 + Br2 2IBr Kc=280 at 150C . Suppose that 0.500 mol IBr in a 1.00-L flask is allowed to reach equilibrium at 150C. What is the equilibrium concentration of IBr What is the equilibrium concentration of I2 What is the equilibrium

    asked on March 4, 2018
  3. Physics

    A wheel turns through 90.0 revolutions in 15.0 sec. The angular speed at the end of this 15.0 sec period is 10.0 rev/s. Assuming that the angular acceleration is constant, calculate a) the angular speed at the beginning of the 15.0 sec interval, and b) the

    asked on May 5, 2014
  4. Chemistry

    Consider a chromium-silver voltaic cell that is constructed such that one half-cell consists of the chromium, Cr, electrode immersed in a Cr(NO3)3 solution, and the other half-cell consists of the silver, Ag, electrode immersed in a AgNO3 solution. The two

    asked on May 12, 2014
  5. Maths

    The question is "Show that z-2 is a factor of P(z)= z^3+mz^2+(3m-2)z-10m-4 for all values of m. For what values of m is (z-2)^2 a factor of P(z)?" I've proven the first part, using synthetic division, for all values of m. But the second part, I don't

    asked on April 13, 2009

    For the reaction I2 + Br2 2IBr Kc=280 at 150C . Suppose that 0.500 mol IBr in a 2.00-L flask is allowed to reach equilibrium at 150C . What is the equilibrium partial pressure of IBr? What is the equilibrium partial pressure of I2? What is the equilibrium

    asked on March 4, 2018
  7. Chemistry

    You have a 135 mL buffer solution of 0.35 M NH3 and 0.40 M NH4+ in concentration. NH4+ (aq) + H2O (l) H3O+ (aq) +NH3 (aq) Calculate the pH of this buffer after adding 10.00 mL of 0.095 M NaOH.

    asked on April 3, 2018
  8. physics

    A small droplet of oil with mass of 1.84×10-15 kg is held suspended in a region of uniform electric field directed upward with a magnitude of 6625 N/C. Is the excess charge on the droplet positive or negative? NEGATIVE b.How many excess elementary charges

    asked on September 1, 2011
  9. Physics

    A parallel-plate capacitor is designed so that the plates can be pulled apart. The capacitor is initially charged to a potential difference of 80 Volts when the plates are 1.0 mm apart. The plates are insulated so that the charge cannot leak off. What is

    asked on September 22, 2011
  10. English

    I just had an English exam, and I don't think I do too well. Anyways, there was a few questions in it that I didn't quite understand in the prose questions (comprehensions or whatever they're called). After reading the passage, there was a question asking

    asked on June 10, 2008
  11. physics

    Three equal positive point charges of magnitude Q = 8.00ì C are located at three corners of a square of edge length d = 11.8 cm. A negative charge -24.00ì C is placed on the fourth corner. At the position of the negative charge, what is the magnitude of

    asked on September 1, 2011
  12. Chemistry

    The charcoal from ashes found in a cave gave 3.34 14C counts per gram per minute. wood from the outer portion of a growing tree gives a comparable count of 16.0. The half life of 14C is 5700 years. How old are the ashes?

    asked on March 4, 2018
  13. Chemistry

    Arrange each group of compounds/ions in order of increasing pH. 1. Li2CO3 , OH^- , NH4Br , NaCl 2. CH4 , HBr , H2O , F^- Lastly, I'd like to check if my answers for the following three questions were listed correctly in order of pH levels increasing. 3.

    asked on March 31, 2018
  14. Chemistry

    The half life of tritium is 12.3 yr. If 62.2mg of tritium is released from a nuclear power plant during the course of an accident, what mass of this nuclide will remain after 105 yr?

    asked on March 3, 2018
  15. physics

    A 8.20 cm tall object is placed 30.0 cm in front of a concave mirror with a focal length of 4.20 cm. What is the magnification?

    asked on November 10, 2011
  16. physics

    A coin 1.9 cm in diameter is held 40 cm from a concave spherical mirror of 30 cm radius of curvature. Locate the image of the coin Then what is the diameter of coin?

    asked on November 10, 2011
  17. English - Macbeth

    I have a little trouble understanding my essay question. This question is: Is Macbeth a tragic hero according to the classical definition of the term or is he merely a monster? Does Shakespeare succeed in creating sympathy for Macbeth? To repsond to this

    asked on August 17, 2008
  18. Chemistry

    How many moles of H2SO4 are present in 250 g of an aqueous solution that is 4.8 m (molal)? The density of the solution is1.58 g/mL.

    asked on February 14, 2018
  19. English - Essay Writing

    I've just read the book 'To Kill a Mockingbird and I have to write an essay on the question "Explain how the themes of prejudice and tolerance are explored in the novel" I've started on my essay, but it's been a long time since I've written one. I've made

    asked on March 25, 2008

    When doing an ICE Chart in Chemistry, when do you know whether the C is a negative or positive? I was told if the problem gives us reactant concentrations and no product concentration then the reaction goes forward and make the reactant lose and the

    asked on March 4, 2018
  21. Physics

    A catapult launches its payload at a 50.0degrees angle and the payload leaves the catapult 3.00 meters off the ground. If the payload travels 300.0 meters in the horizontal direction, what was the launch speed? At what speed does the payload hit the

    asked on April 21, 2014
  22. us history

    list ten political and economic reforms the populists proposed in their platform?

    asked on February 10, 2010
  23. Maths

    Could someone help me with this question Write in polar form : sinx - i cosx I've come up to this point, and it's wrong, can't someone please help? =sin(pie/2-x)-icos(pie/2-x) =cosx-isinx =cis(-x) But the answer is cis(x-pie/2)

    asked on March 4, 2009
  24. math

    translate 16 less than the quotient of a number and 7 equals 3

    asked on November 15, 2015
  25. Chemistry - Neutralisation

    I'm having a few troubles on my equations. I have to write the neutralisation reaction equation between Acetic Acid and Sodium Hydrogen Carbonate I've gotten this far, but I don't if its the right way to do it CH3COOH + NaHCO3 ---->>> (salt) + H2O I don't

    asked on August 21, 2008
  26. Physics

    I'm doing a report on my experiment right now where you had to test out the voltage and current of 2 resisters and a light globe with an ammeter and voltmeter. We had to graph the results, and the reisistors had a linear relationship between voltage and

    asked on May 24, 2008
  27. English - Connected Texts

    Can anyone suggest two films that I could use to compare and contrast? Because I have to choose two for my English task, and the films have to a decent amount of smiliarites. My problem is that there are too many movies out there to choose from and I'm not

    asked on April 11, 2008
  28. Ancient History

    ‘It was Sparta, not Athens which won the war against Persia’. To what extent is this view of the Persian War correct? I've decided that it the statement is patly correct. Is there any websites/study guides/free essays that could help me with ideas for

    asked on March 31, 2008
  29. physics

    A screen is placed exactly one meter away from an illuminated test pattern. A lens placed between them forms a clear (focused) image of the pattern on the screen when the center of the lens is 200 mm from the test pattern. What is the focal length of the

    asked on November 10, 2011
  30. Oral Presentations

    I've got an upcoming speech to prepare, and my teacher has hardly given any preparation time and I'm the type of person who is very conservative and quiet. I'm afriad of being boring with my speech because our teacher has told us to make it interesting,

    asked on May 25, 2008
  31. Economics

    Is there a website to find the inflation rates of the America? I've tried to search on google, but I don't know their central bank is.

    asked on May 14, 2008
  32. Physics

    What are differences and similarities of the electric charges (+ and -) and the magnetic forces (North and South)?

    asked on May 19, 2008
  33. English - Critique Essay Please

    This is how much I've done so far, not finished yet but could you see if I'm on the right track? I'm following the structure of Introduction, 3 Main Body Paragraphs and a Conclusion. Explain how the themes of prejudice and tolerance are explored in the

    asked on March 26, 2008
  34. Chemistry

    How many mL of 0.100 M HCl must be added to 100.0 mL of 0.100 M F- to prepare a buffer solution that has a pH of 3.05? F- (aq) +H20 (l) HF (aq) +OH- (aq) Kb= 1.47*10^-11

    asked on April 3, 2018
  35. Chemistry

    I just did an experiment on the enthalpy of combustion of different alcohols, and for my report, I've written that the condition of the wick is a source of random error, but i can't seem to explain it. I've written that it affects the rate of burning of

    asked on April 7, 2009
  36. Maths - Matrices

    I'm having trouble with doing this matrix proof The question is "Given some matrix A has the property A*2=A^-1, show that determinant A = 1, i.e |A| = 1" I've tried for ages, but I can't seem to do it, this is what I got to A^2= A^-1 |A^2| = |A^-1| |A|^2 =

    asked on March 29, 2009
  37. Physics

    I'm writing a prac report, and I just need something clarified. The experiment was different masses were attached on a hanging spring, then it had to be pulled down a certain distance, then find the period by finding the time fo each oscillation for each

    asked on March 28, 2009
  38. Physics

    I'm writing a prac report, and I just need something clarified. The experiment was different masses were attached on a hanging spring, then it had to be pulled down a certain distance, then find the period by finding the time fo each oscillation for each

    asked on March 28, 2009
  39. Physics

    For Hooke's Law, the one about springs and mass, is the mass M a unit of g or kgs?

    asked on March 26, 2009
  40. Physics

    Does the velocity of a model rocket increase or decrease when the parachute is deployed?

    asked on November 10, 2008
  41. Maths - Reciprocals

    I'm having some troubles. I can't think of an example to this question. Give an exmaple of a quadratic whose reciprocal has no vertical asymptotes I think it's 1/x^2. The question says vertical asymptotes so I'm assuming they mean there will only be one.

    asked on August 24, 2008
  42. Physics

    "How can you tell the charge on the VanDer Graf generator is - ?"

    asked on March 31, 2008
  43. Chemistry

    Using your knowledge of equilibrium constants, calculate the value of K1 given the following equations: 2A+B ---> C K1=x 2B ----> D K2=5.00 2C -----> 4A+D K=0.0588 The arrows are reversible

    asked on March 2, 2018
  44. statistic

    a numerical value for a correlation can never be

    asked on July 22, 2013
  45. Physics

    The stored electrical energy of a 800-ƒÊ F capacitor charged to 1.20~104 Volts is converted to thermal energy by discharging the capacitor through a heating element submerged in 711.6 g of water in an insulating cup. What is the increase in temperature

    asked on September 22, 2011
  46. English

    I've got a few sentence here, but I always get confused whether to use affect or effect. Can you help me out? 1. Furthermore, Lee and Hosseini illustrate the affect that the experiences their protagonists encounter during childhood have upon the characters

    asked on June 4, 2008
  47. Statistics - Excel

    Can anyone help me with finding Standard Deviation in Excel? I have about 20 entries of different house prices, and I need to find the standard deviation. I know you had to enter something like 'SDEV=" but I can't remember.

    asked on May 24, 2008
  48. Source Analysis

    I have an upcoming source analysis for my mid year exam in Ancient History, and after my past few source anaylsis', I haven't had of the greatess success. If there any websites or guides that could help me anaylse sources, such as sections of text and

    asked on May 7, 2008
  49. Economcis

    I have an assignment on the the factors which impact the Australian dollar. "How does the government influence the value of the Australian dollar?"

    asked on May 2, 2008
  50. Physics

    How can you use a curved mirror to make a telescope? If possible, if there a diagram somewhere?

    asked on March 25, 2008
  51. Maths - Trig

    I just had a test, and one question I tried heaps of times and I still couldn't answer. It was "Prove secèsinè + cosecè cosè = 2cosecè " Can someone please tell me if proving this is possible at all? (But don't tell me how to solve it)

    asked on February 19, 2009
  52. Physics - Light & refraction

    I go this question in a test just today, but I know I got it wrong because I didn't study this section. It was something along the lines of this I'm pretty sure. "Explain why there is no critical angle when light travels from air to water" Can someone

    asked on May 2, 2008
  53. Maths

    The weight of a termite mound (y) in kilograms is measured each month (x) after it was first found. The mound after 1 month is found to be 2 kilograms and after 3 months it is measured at 18 kilograms. It is believed that the model connecting the weight of

    asked on April 14, 2008
  54. HCA/270

    what are the rules of thumb?

    asked on June 22, 2009
  55. Real Estate Project (Maths)

    I don't know if you can help me here or not, but I'll ask anyways. I've been given a Real Estate assignment where I had to compare the sale prices of properties of different suburbs and then compare them, with the Mean, Standard Deviations, Histograms,

    asked on May 31, 2008
  1. Chemistry

    Actually, #1 and 2 are to be answered but if I were to take a stab at it would the correct order of increasing pH be 1. Li2CO3, NaCl, NH4Br , OH^- 2. HBr , HF, H2O , CH4

    posted on March 31, 2018
  2. Chemistry

    I wanted to know if 1 and 2 were fine, like if it were correct.

    posted on March 31, 2018


    posted on January 21, 2015
  4. Chemistry

    2.76 M

    posted on November 20, 2013
  5. physics

    so would the answer be positive?

    posted on September 1, 2011
  6. Physics


    posted on October 12, 2010
  7. Maths

    Thats the results I got, thank you =D

    posted on April 13, 2009
  8. Physics


    posted on March 26, 2009
  9. Physics

    I'm writing a prac report on an experiment where we had to vary the mass on a spring, and graph it against the period, then graph it again when period vs square root of mass, which should be linear given the proportionality. Does it really matter which

    posted on March 26, 2009
  10. Augmented Matrix

    I think its [ 1 1 | 7] [ 0 3 | 9] R2->2R1 - R2 0x+3y=9 y=3 Sub that into x+y=7 x+3=7 x=4 Therefore, (4,3)

    posted on March 4, 2009
  11. Geometry

    Google it? I had a similar question, and I think it was forumal is gave, and i used that to asnwer the question.

    posted on August 26, 2008
  12. maths reciprocal

    I'm thinking of something along the lines of Bor.....K....ien

    posted on August 25, 2008
  13. maths reciprocal

    I'm guessing BK is around here somewhere

    posted on August 25, 2008
  14. maths reciprocal

    Just out of curiousity, are you from Adelaide? Because I got this same assignment, which is from the SSABSA website. I just thought you were a friend of mine, because my friend also uses the initials TK< but he didn't post this.

    posted on August 25, 2008
  15. maths reciprocal

    who r u TK, r u from NMHS?

    posted on August 25, 2008
  16. Maths - Reciprocals

    Thank you.

    posted on August 24, 2008
  17. Chemistry - Neutralisation

    I can't seem to figure out my next question either. Neutralisation between Acetic Acid and Sodium Carbonate. CH3COOH + Na2CO3 --->>>> (salt) + H2O I really hope someone can help me. Thanks.

    posted on August 21, 2008
  18. English - Macbeth

    sorry, a typo. It was meant to say Tragic Hero, not tragic monster

    posted on August 17, 2008
  19. English - Macbeth

    I think I get the idea of a tragic hero, but for my essay, should I have a point in there somewhere to argue how he is a tragic monster and not a monster, because the question asks "Is Macbeth a tragic hero.....or a monster?"

    posted on August 17, 2008
  20. English


    posted on June 4, 2008
  21. Physics

    So basically, the light bulb's resistance varies?

    posted on May 25, 2008
  22. Statistics - Excel

    Never mind, I found it, you type =STDEV and highlight the values.

    posted on May 24, 2008
  23. Economics

    More specifically, the infaltion rates of around 1980.

    posted on May 14, 2008
  24. Source Analysis

    obviously they're typos, you don't need to critique my writing, if i wanted it to be perfect, i would have corrected it

    posted on May 8, 2008
  25. English - Connected Texts

    Is Romeo and Juliet a book that has a lot of complex themes or messages? I haven't read it personally, but I just want to make sure I'm not in-over-my-head because I have two weeks of holidays to read the book, and watch a film and write a 5 page journal

    posted on April 12, 2008
  26. English - Connected Texts

    Well actually, I could do a book and film. Its better if I do a novel and film because it will prepare me better for the following year, so if you have a book & film or film & film that you can suggest, it would be very helpful.

    posted on April 11, 2008
  27. English - Essay Writing

    That was actually me who asked the question on the second post, I was in the library when I asked that question, so mix up with the names.

    posted on March 26, 2008