Popular questions and responses by Victor
  1. Physics

    A spring of natural length 30cm is stretched 35cm by a load of 15N, calculate the extension produced

    asked on July 30, 2020
  2. Maths

    A sector of a circle of radius 7cm subtending an angle of 270 degree at centre of the circle is use to form a cone? (A)find the base radius of the cone. (B)calculate the area of the base of the cone.

    asked on February 2, 2016
  3. Mathematics

    The mean height of three groups of students consisting of 20, 16 and 14 students are 1.67m, 1.50m and 1.40m, respectively. Find the mean height of all the students.

    asked on August 13, 2020
  4. kelvin

    P,Q and R are points on the same horizontal plane .the bearing of Q from P is 150° and the bearing of R from Q is 060°. if |PQ| =5m and |QR|=3m find the bearing of R from P correct your answer to the nearest degree

    asked on January 9, 2017
  5. Chemistry

    Consider two flasks. What are the final partial pressure of H2 and N2 after the stopcock between the two flasks is opened? Assume the final volume is 3.00 L. What is the total pressure in torr? Flask 1: 2.00 L H2, 475 torr Flask 2: 1.00 L N2, 0.200 atm

    asked on April 6, 2017

    How many liters of chlorine gas at 25C and 0.950 atm can be produced by the reaction of 24.0 g of MnO2 with hydrochloric acid? The products include manganese (II) Chloride, water, and chlorine.

    asked on April 8, 2017
  7. More Chem

    Consider the combustion of propane. Delta H is -2221 kJ. Assume all heat is from combustion of propane. What mass of propane must be burned in order to furnish this amount of energy assuming the heat transfer process is 60% efficient.

    asked on April 8, 2017
  8. English

    In not less than 450 words,write an expository essay on the topic:the state of the nation(Nigeria)

    asked on February 22, 2020
  9. math

    the first term of an ap is -8 the ratio of the 7th to the 9th term is 5:8 calculate the common difference of the progression

    asked on October 26, 2019
  10. math

    the first term of a gp is twice its common ratio. find the sum of the first two terms of the progression if its sum to infinity is 8

    asked on October 26, 2019
  11. Chemistry

    Label each of the following reactions as exothermic or endothermic ("exo" or "endo"), and according to whether work is done on or by the system, or no work is done at all ("on", "by" or "none")? Note that no "endo-on" cases appear here, as these are always

    asked on November 22, 2009
  12. Maths

    Make r the subject of formula t=2πr(r+h)

    asked on May 6, 2018
  13. Physics

    There is a charge that is 1uC and another charge that is 2 uC. They are 10 cm apart. I need to find a point where the electric field is zero. All I have is this kq1\a=kq2\(10-a)^2 where q1=1 where q2=2 where k=9*10^9 I am lost after this I know I use

    asked on August 9, 2009
  14. Chem

    A 30 g sample of water at 280 K is mixed with 50 g of water at 330 K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.

    asked on April 8, 2017
  15. chem

    a) Co(H2O)6^2 + 4 Cl^‐1 (aq) ⇄ CoCl4^‐2 (aq) + 6 H2O (l) Rewrite the net ionic equation above including the energy term where appropriate. The Delta H for this reaction is +50 kJ/mol. b) Silver chloride (AgCl) is a white solid. For the equilibrium

    asked on October 4, 2015
  16. Physics

    Archimedes purportedly used his principle to verify that the king's crown was pure gold, by weighing the crown while it was submerged in water. Suppose the crown's actual weight was 14.0 N. The densities of gold, silver, and water are 19.3 g/cm^3, 10.5

    asked on December 3, 2012
  17. physics

    You are given a vector in the xy plane that has a magnitude of 94.0 units and a y component of -44.0 units. A. What are the two possibilities for its component? For this part I got x = 83.1 and -83.1 B. Assuming the x component is known to be positive,

    asked on July 21, 2011
  18. Physics

    There is a 85uC point charge at the origin. Find the electric field at the point x3= -45cm , y3= 55cm (5.85*10^5)(-.45+.75)/(-.45^2+.75^2)^3/2 am I totally off The previous questions before this were to find at x1=40cm y1=0 and x2=65cm y2=65cm I figured

    asked on August 9, 2009
  19. environmental science

    Are cheap imports of consumer goods from China being subsidized by insuffient investment in environmental protection in that country? What information would you like to have in order to answer the question more fully? thank you for the help

    asked on April 16, 2008
  20. Physics

    in air an object weighs 15N. when immersed in water it weighs 12 N. when immersed in another liquid it weighs 13 N.determine the density of the object and that of the other liquid

    asked on January 19, 2020
  21. physics

    The resultant of two forces X and Y will be the greatest when the angle between X and Y is:

    asked on November 6, 2017
  22. Written Communication

    At the library, the quickest way to locate varied, reliable information for your research paper is to A. check the encyclopedias. B. search the card catalog for related titles. C. ask the reference librarian. D. check the Readers' Guide.

    asked on January 21, 2015
  23. geometry

    an equilateral triangle of side 20cm is inscribed in a circle.calculate the distance of a side of the triangle from th centre of the circle.

    asked on March 30, 2011
  24. science

    (Points: 10) For the following: i) HClO4 > HBrO4 > HIO4 ii) NH3 > PH3 > AsH3 > SbH3 iii) HOClO3 > HOClO2 > HOClO > HOCl iv) HBr>HCl>HF The order of acidity is correct for which series? 1. ) all are correct 2. ) ii and iii 3. ) ii and iv 4. ) ii 5. ) i,

    asked on November 22, 2009
  25. Mathematics

    If x raise to power two +14x +k is a perfect square find k

    asked on May 29, 2020
  26. math

    If 16 men can construct 800 tables in 9 days how long will it take 15 men to construct 1000 tables if they work at the same rate

    asked on June 9, 2017
  27. Chemistry Heat

    4Fe + 3O2 ---> 2Fe2O3 Delta H -1652 kJ How much heat is released when 10 g Fe and 2 g O2 are reacted.

    asked on April 8, 2017
  28. Chemistry

    What mass of zinc would need to react with hydrochloric acid in order to produce 25.0 mL of hydrogen gas collected over water at 25 degrees celsius and 105 kPa. How do you solve this using the combined gas laws? The answer is 0.067 grams but how do you get

    asked on April 7, 2017
  29. Physics

    a boat sails 150km N60°E, then 100km West. What is it's displacement from its starting point?

    asked on January 25, 2017

    What is the potential energy of a 150 kg diver standing on a diving board that is 10 m high?

    asked on April 24, 2016
  31. Maths

    A box is made of wood 5cm thick, its internal dimension are 10cm by 8cm by 11cm, what is the volume of the wood in the box

    asked on April 20, 2016
  32. statistics

    Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course. 61,74,47,60,62,63,65,79,55,85. In all 135 students took the exam. The third quartile for all 135 scores was 69. How many students had scores higher

    asked on December 9, 2013
  33. physics

    Pelicans tuck their wings and free-fall straight down when diving for fish. Suppose a pelican starts its dive from a height of 15.0 m and cannot change its path once committed. If it takes a fish 0.25 s to perform evasive action, at what minimum height

    asked on July 18, 2011
  34. Science

    Can anyone give me an acrostic poem on lithosphere?

    asked on November 7, 2010
  35. Vectors

    Two vectors, A and B, are added by means of vector addition to give a resultant vector R. The magnitudes of A and B are 9 m and 8 m, respectively, and they can have any orientation. What are the maximum and minimum possible values for the magnitude of R?

    asked on September 2, 2010
  36. math

    how do u equal $0.55 with two coins without useing a nickel and us coins

    asked on August 26, 2009
  37. physics

    True or false questions a)Rubbing a polythene rod with a duster gives the rod extra negative charge. b)Rubbing a polythene rod with a duster takes away positive charge from the duster. c)The duster will have the same charge as the polythene rod it has

    asked on February 8, 2009
  38. algebra

    the larger of two numbers is 1 more than twice the smaller.the sum of the numbers is 20 less than three times the larger.find the numbers

    asked on May 26, 2008
  39. Maths

    Please show me the working It says the elastic band is used to hold seven of the same pencil what is the length of the band in this position.

    asked on March 8, 2020
  40. Researching

    Which of the following information should be included when citing a website that is not needed when citing other research sources. A- publisher of site B- date site was accessed C author’s name**** D- Publication date

    asked on September 18, 2019
  41. Chemistry

    What volume of gas can be produced in a lab where pressure is 16.0 psi and temperature is 25 C if you collect it over water from the reaction of 50g of ammonium sulfate with 50g of aluminum hydroxide. The equation for the reaction is: 3(NH4)2SO4 + 2Al(OH)3

    asked on April 7, 2017
  42. basic programming principles

    2.Write only the select case statements for the following problem statement. The marital code of a person is stored in the variable called marCode. Display the corresponding description on the screen. Provide for an incorrect marital code Marital Code S

    asked on March 31, 2015
  43. Finance

    What is the coupon rate of a two-year, $10,000 bond with semiannual coupons and a price of $9,543.45, if it has yield to maturity of 6.8%?

    asked on March 29, 2014
  44. Fiance

    What must be the price of a $10,000 bond with a 6.5% coupon rate, semi-annual coupons, and two years to maturity if it has a yield to maturity of 8% APR?

    asked on March 29, 2014
  45. Finance

    If $12,000 is invested in a certain business at the start of the year, the investor will receive $3,600 at the end of the next four years. What is the present value of this business opportunity if the interest rate is 7% per year?

    asked on March 29, 2014
  46. Geometry

    What is the equation go the line that is parallel to the graph of y=1/2x+6, and who's y-intercept is -2

    asked on November 21, 2013
  47. physics

    A block with mass = 5.0 rests on a frictionless table and is attached by a horizontal spring ( = 130 ) to a wall. A second block, of mass = 1.35 , rests on top of . The coefficient of static friction between the two blocks is 0.40. What is the maximum

    asked on January 24, 2013
  48. Physics 2A

    A position vector has an x component of -2.5 m and a y component of 4.2. (a) What is the vector's magnitude and directions? b) suppose a spider took 10 minters to first walk -2.5m in the x direction and then 17 mintures 4.2 m in the y direction? Find the

    asked on September 9, 2012
  49. math

    The number of dogs and chickens on a farm add up to 14. The number of legs between them is 36. How many dogs and how many chickens are on the farm if there are at least twice as many chickens as dogs

    asked on August 30, 2012
  50. Statistics

    Cellular Phone Sales The probability that a cellular phone company kiosk sells X number of new phone contracts per day is shown below. Find the mean, variance, and standard deviation for this probability distribution. X 4 5 6 8 10 P (X) 0.4 0.3 0.1 0.15

    asked on April 10, 2012
  51. mercy land

    the 2nd, 3rd, and 4th term of an arithemetic progression are x-2, 5 and x+2 respectively, calculate the value of x and hence find the 20th term..

    asked on November 8, 2011
  52. Spanish-SraJMcGin please check

    I had asked a question the other day but I'm not sure if I'm understanding this- it was a comparison-You said this as a comment: Spanish-8th grade - SraJMcGin, Thursday, October 20, 2011 at 4:02pm 3. also = de las tres actividades Also, #3 is different

    asked on October 22, 2011
  53. statistics

    A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 121.2-cm and a standard deviation of 1.8-cm. Suppose a rod is chosen at random from all the rods produced by the company. There is a 23% probability that

    asked on October 18, 2011
  54. mathematics

    Find the equation of the parabola with the vertex at the origin and directrix y =5

    asked on August 3, 2011
  55. physics

    You are driving in your car and you apply a constant force to your brake pedal. Which of the following are changing? (Ignore air resistance) a. Speed b. Velocity c. Acceleration d. Speed and Velocity e. All of the above

    asked on February 2, 2011
  56. Math

    If a sphere has radius 5 m. what is the surface area of the sphere?

    asked on January 17, 2011
  57. Physics

    A person takes about 20 breaths per minute with 0.5 litre of air in each breath. How much heat is removed per hour by the moisture in the exhaled breath if the incoming air is dry and the exhaled breath is fully saturated? Assume that the water vapour

    asked on May 21, 2010
  58. Economics(12 Multiple Choice)

    1. John Maynard Keynes said business investment is determined mainly by a. the state of business confidence b. expectations about the future c. psychological perceptions about the economy d. all of the above 2. Assume that the Canada experiences higher

    asked on November 26, 2009
  59. economics-Budget Constraint & Utility

    Sally is a frequent flyer whose fares are reduced through coupon offerings. She receives a 20% reduction on fares after she flies 20,000 miles, and 40% reduction after she flies 40,000 miles. a) Illustrate her budget constraint. b) Illustrate how her level

    asked on October 26, 2009
  60. microeconomics

    Fact 1: "The substitution effect(SE) must ALWAYS be negative (i.e. goes in the opposite direction to the change in PRICE). The income effect(IE) can be either positive or negative." Fact 2: "SE and IE can go in the same direction or they can go in opposite

    asked on October 18, 2009
  61. 9th Grade Math

    Hey, I finished my math homework, and im not so sure i did it correct, so can someone do this question and i will look at the answer to see if my work was correct this is State and Justification Given : m

    asked on December 2, 2008
  62. Algebra I-

    (solving for x) 3(x+5)=6x-4+7(-7x-1) Each time I try this i plug the numbers in and i find out that i am worng. Please help! I get -13/23 but I didn't check it. Post your work if you want me to check it and find your error.

    asked on January 21, 2007
  63. mathematics

    3/5 + blank = 1 1/2 trying to figure out the blank

    asked on May 17, 2020
  64. mathematics

    blank + 1/2 = 1 2/3 im trying to figure out the blank

    asked on May 17, 2020
  65. Physics

    calculate the resultant of five coplanar forces 10n

    asked on March 16, 2020
  66. History

    What child labor reforms ddI progressives seek?

    asked on February 19, 2020
  67. science

    in a certain automobile when five passenger get in their total mass being 360kg the spring of the suspension are compressed a distance 4cm. the total mass including the passenger supported by the suspension is 900kg. assuming that the displacement of the

    asked on February 18, 2020
  68. physics

    A boy walk 5m east, then 4m south and finally 2m west. calculate the magnitude and direction of the resultant displacement.

    asked on November 11, 2019
  69. Math

    In the diagram,Q is SW of P R is NW of P ∆QPT is 165°.What is the bearing of T from P?

    asked on October 27, 2019
  70. Math

    A chord is 4cm from the centre of a circle of radius 7cm. Calculate (a)the angle subtended by the chord at the centre (b) the length of the minnor arc cut off by the chord

    asked on June 5, 2019
  71. math

    if (3-x), (6),(7-x) is a geometric sequence calculate (a)the two possible values of x (b) common ratio (c) sum of the sequence

    asked on March 15, 2019
  72. science

    A mass 10kg moves with a velocity of 4m/s .fin d the kinetic energy

    asked on March 3, 2019
  73. algebra

    How long does it take your money to double if it is left in an account for 20 years and earns 8.5% interest compounded continuously?

    asked on February 25, 2019
  74. Maths

    A man spent one fourth of his monthly salary on rent, two fifth of the remaining on food and one sixth of still remained on drinks. What fraction did he spent on drinks

    asked on January 20, 2018


    asked on November 6, 2017
  76. chemistry

    How to prepare 0.5m of HCL using 500ml standard flask

    asked on October 30, 2017
  77. Maths

    If the first term of an arithemetic progression is -4 and the twelveth term is 8,find the common difference.

    asked on October 30, 2017
  78. Functions

    If a function is undefined at a point, can that point be in its domain? Explain.

    asked on September 14, 2017
  79. chemistry

    Calculate the mass of marble chips that produce 20 grams of carbon (iv) oxide .when reacted with dilute hydrochloric acid (c=12,O=16,Ca=40)

    asked on May 2, 2017
  80. Chemistry

    A sample of Helium occupies 200 L at 30ºC under a pressure of 841 torr. What is the volume it occupies at standard temprature and pressure (STP)?

    asked on April 21, 2017
  81. Trigonometry

    How do you know where to plot the points of a cosine function on a graph? Is there a more simple way then plugging the x value into the calculator?

    asked on April 19, 2017
  82. math

    A model of a rectangular patio at a landscaping business will be enlarged by a scale factor of 2 when it is installed in a customer’s back yard. The area of the new enlarged patio will be 160 square feet. Which is the area of the landscaper’s model? 10

    asked on April 18, 2017
  83. Physics

    A small, circular washer of radius a = 0.750 cm is held directly below a long, straight wire carrying a current of I = 13.0 A. The washer is located h = 0.495 m above the top of a table (see figure below). Assume the magnetic field is nearly constant over

    asked on April 17, 2017
  84. Chemistry

    How many liters of CO2 would be collected over water from the bomcustion of 35g of cyclohexane, if the gas is collected at a barometric pressure of 765 torr and a temperature of 303 K?

    asked on April 10, 2017
  85. Chemistry

    In a coffee cup calorimeter, 2.00 g of potassium hydroxide are mixed with 200.0 g of water at an initial temperature of 25.00C. After dissolving the salt, the final temperature of the solution is 27.33C. What is the heat change for the dissolution of

    asked on April 9, 2017
  86. Chemistry

    Thirty feet of water exert a pressure of 1 atm. Calculate the pressure (in kPa) exerted on a diver at a depth of 50 feet on a standard day.

    asked on April 9, 2017
  87. Chemistry

    A 30 g sample of water at 280 K is mixed with 50 g water at 330 K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.

    asked on April 9, 2017
  88. Chemistry

    So Ag+ + Cl- ---> AgCl and delta H is -65.5 kJ. I'm supposed to calculate delta H when one mole of AgCl dissolved in water, so 1 mol AgCl *(65.5 kJ/1mol Agcl) right? But the answer is 65.5 kJ, and why is it positive, not negative, is my question.

    asked on April 8, 2017
  89. Chemistry

    The reaction Fe + Br2 ---> FeBr2 Delta H = -249.8kJ Calculate delta H when 10.0 g of FeBr2 is formed.

    asked on April 8, 2017
  90. Chemistry

    You want to make 40 mL of gas from some aluminum carbonate. The temperature of the lab is 23 C and the rpessure is 760 torr. If you collect the gas over water, what mass of reactant is necessary?

    asked on April 7, 2017
  91. physics

    In using a pulley system, an effort of 100N is needed to raise steadily a load of 800N (a) what is the mechanical advantage?. Data effort=100N load=800N M.A=load/Effort M.A=800N/100N M.A=8

    asked on March 8, 2017
  92. physics

    How much work isneeded to stop a 20g bullet moving with a speed of 150m/s

    asked on March 1, 2017
  93. Chemistry

    A is a solution of hydrochloric acid containing 3.650g of HCl in 1dm3 of solution. B is a solution of impure sodium carbonate. 25cm3 of B require 22.7cm3 of A for complete reaction. Given that 5.00g of impure B was dissolved in1dm3 solution,what is the

    asked on February 23, 2017
  94. Math

    The shipping clerk packs a cube with side lengths of 8 inches into a box with side lengths of 10 inches. What is the volume of the space left in the larger box for packing materials?

    asked on February 15, 2017
  95. math

    A baseball diamond is a square with each side 90 feet long. What is the straight-line distance from third base to first base? (Round your answer to the nearest tenth.)

    asked on February 1, 2017
  96. math

    The north wall of a barn is a rectangle 25 feet high and 60 feet long. There are five windows in the wall, each 8 by 10 feet. If a gallon of paint will cover 275 ft2, how many gallons of paint must the painter buy to paint the wall?

    asked on February 1, 2017
  97. MATH

    IF LOG10 A=4,WHAT IS A?

    asked on January 2, 2017
  98. Chemistry

    A minimum energy of 151 kJ is required to dissociate a mole of iodine molecules, I2. Calculate the wavelength of radiation that supplies this energy, assuming each bond beaks by absorbing one photon.

    asked on November 28, 2016
  99. Science

    Which is the molarity of a solution containing 20 g of CH3 OH in 300 mL of solution

    asked on November 10, 2016
  100. Math

    Every Wednesday is salad bar day at Ashley's school. The most popular ingredients are cherry tomatoes, cucumber slices, and shredded carrot. Last Wednesday, out of the 27 students in Ashley's class- 14 took carrot 13 took cucumber 16 took tomato 8 took

    asked on October 26, 2016


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