Most popular questions and responses by Joel
  1. Business Calculus

    An ice cube that is 3 cm on each side is melting at a rate of 2 cm cubed per minute. how fast is the length of the side decreasing?

    asked on October 21, 2010
  2. Social studies

    why does the cartoon from the bank war 1832 portrat president jackson as a king

    asked on November 22, 2016
  3. geometry

    What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radii and altitudes is 4:3?

    asked on March 6, 2018
  4. Maths

    Prove By induction that sinx + sin3x + sin5x +.... Sin(2n-1) =sin^2(nx)/sin3x

    asked on September 7, 2016
  5. college trig word problem

    A Ferris wheel has a radius of 25 feet.The wheel is rotating at two revolutions per minute.Find the linear speed, in feet per minute, of a seat on this ferris wheel.

    asked on December 15, 2012
  6. Chemistry

    2. In a calorimeter, 40.0g water at room temperature (20.4 C) was mixed with 60.0 g of water that was initially 48.9 C. The resulting mixture reached a maximum temperature of 37.3 C. Calculate each of the following. a) The heat released by the hot water.

    asked on April 16, 2013
  7. math

    A stunt motorcyclist makes a jump from one ramp 20 feet off the ground. The jump between ramps can be modeled by y= -1/640x^2 + 1/4x +20 where x is the horizontal distance (in feet) and y is the height above ground (in feet). I think a is 20 feet, but I

    asked on September 24, 2013
  8. CHemistry

    Which one of the following is expected to be the strongest Lewis acid? Fe, Fe+, Fe2+, Fe3+ Which do you think would accept electrons the easier? Fe(s) or Fe^+? Do that same kind of logic on the others one by one.

    asked on April 27, 2007
  9. Chemistry

    How do I calculate the mass of sodium carbonate required to neutralize 15-20 mL of 0.25M HCl at the stoichiometric point?

    asked on May 17, 2012
  10. physics

    A flywheel is making 180 r.p.m. and after 20 seconds it is running at 140 r.p.m. How many revolutions will it make, and what time will elapse before it stops, if the retardation is uniform ?

    asked on December 31, 2014
  11. History

    which represents an aztec adaptation to their environment A. A surplus of farmed crops accurate 365 day calendar C.a system of causeways D.farming in terraces

    asked on September 27, 2016
  12. Math

    Help! Toshiro Hashimoto invested some money at 4.5% simple interest and $1000 more than four times the amount at 6%. His total annual income for one year from interest on the two investments was $801. How much did he invest at each rate?

    asked on September 15, 2010
  13. chem

    Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 3.10 of sodium carbonate is mixed with one containing 4.43 of silver nitrate. How many grams of silver nitrate are

    asked on February 23, 2015
  14. Can't understand trig problem

    An airplane left an airport and flew east 174 miles. Then it turned northward flying along a bearing of N22E. When it was 254 miles from the airport, there was an engine problem and it turned back to take the shortest route possible back to the airport.

    asked on February 1, 2010
  15. Principles of Management

    Question 1 of 20 5.0 Points Which of the following is NOT a benefit of planning? A. Helps you check on your progress B. Helps you think ahead C. Helps you cope with uncertainty D. Helps you compare your results to a standard Reset Selection Question 2 of

    asked on April 22, 2013
  16. History

    what statement best describes the government relationship with England that was in the middle colonies A. Middle colonies were all established as royal colony B.each have a different system based on the charter agreed upon with the king of England C.The

    asked on September 12, 2016
  17. Physics

    Two points charges of 2uC and -6uC are located at the position(0.0)m and (0.3)m.Calculate the total electrical potential at the point (4.0)m due these two charges.

    asked on January 17, 2011
  18. physics

    A cage descends a mine shaft with an acceleration of 0.5 m/s2. After the cage has travelled 25 metres, a stone is dropped from the top of the shaft. Determine : 1. the time taken by the stone to hit the cage, and 2. distance travelled by the cage before

    asked on December 31, 2014
  19. math

    The sum of two decimal numbers is 3.9 Their difference is 0.9,and their product is 3.6 What are the two numbers?

    asked on September 24, 2013
  20. Maths

    Prove That Sin2A+ Sin2B +SIN2C/sinA+SINB+SINC=8sinA/sinB/2COSC/2

    asked on July 28, 2016
  21. Chemistry

    If an equal number of moles of the weak acid HOCN and the strong base KOH are added to water, the resulting solution will be acidic, basic or neutral? There is a complicated answer and a sensible answer. Both arrive at the same answer. But here is the

    asked on April 27, 2007
  22. english

    what is the allusion. Last year our school’s finances were in shambles. Overspending and little control over money has resulted in a situation where there is no money for new books or supplies. School officials are even wondering where they will find the

    asked on May 17, 2011
  23. Algebra 1

    how do i graph x + y = 1 put y on one side y=-x+1 im doing an online test and its asking me to find the equation that matches the graph. But im not sure how to figure it out. well the graph should have a negative slope with 1 as y-intercept look for a

    asked on March 20, 2007
  24. math

    c. What do the slope and y-intercept mean in the context of this problem? Hint: What do you pay when you step into the cab?

    asked on December 6, 2016
  25. algebra

    Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -3x + 4y = -19.5 -3x + y = -10.5

    asked on February 22, 2011
  26. Maths

    Prove that cos3x/cosx-cos6x/cos2x=2(cos2x-cos4x)

    asked on July 28, 2016
  27. math

    I am a 2-digit number. My ones is 3 more than my tens and the sum of my digits is 11. What number am I ?

    asked on November 24, 2017
  28. Maths


    asked on July 28, 2016
  29. Chemistry

    If the temperature of 150.0g of water increased from 23.3C to 44.8C, how much heat was absorbed

    asked on April 9, 2013
  30. Calculus - Related Rates

    Bacteria are growing in a circular colony one bacterium thick. The bacteria are growing at a constant rate, thus making the area of the colony increase at a constant rate of 12 mm sq. per hour. Find an equation expressing the rate of change of the radius

    asked on November 29, 2009
  31. Math

    Parmjit has 8 base ten blocks. She has at least one of each type of block. The value of her blocks is between 400 and 600. What blocks could she have? Find the possible answers using an organized list.

    asked on October 13, 2016
  32. lit

    "One day I'm going to be an astronaut," Adelle told her sister. Did I punctuate correctly?

    asked on May 10, 2011
  33. Maths

    Cynthia’s afternoon train normally arrives at her station at 5:30 pm each day, where she is picked up by Alan and driven home. One day she was on an earlier train which arrived at 5 pm, and she decided to walk in the direction Alan was coming from home.

    asked on March 9, 2017
  34. Maths

    Mr Zubir bouught a pair of pants, a shirt and a coat. The pair of pants and shirt costs $100.90. The pants and coat costs $244.50. The coat costs 5 times as much as the shirt. How much did Mr Zubir pay for his coat?

    asked on August 14, 2011
  35. lit

    n 1946, Albert Einstein said if he had known the Germans wouldn't succeed in constructing the atom bomb, he "would never have lifted a finger." Did I punctuate correctly?

    asked on May 10, 2011
  36. lit

    "Ouch, that hurts!," Kadra said after stubbing her toe. is this correct?

    asked on May 10, 2011
  37. Chemistry

    What is a photon? Several selections may be correct. Has an energy of equal to hν. Is a unit of electromagnetic radiation. Is a part of the electromagnetic spectrum. Is usually called visible light. None of these.

    asked on March 14, 2011
  38. Physics

    A proton is released from rest in a uniform electric field which is directed along the x axis and of magnitude E=2*10exponent5 V/m.The proton undergoes a displacement from point A at the origin to point B at x=0.2m.What is the change in the potential

    asked on January 17, 2011
  39. physics

    How much kinetic energy does a 2000 kg traveling 70 mph have?

    asked on January 24, 2012
  40. LIT

    Dresden was a German city destroyed by the allies in WWII. Which of the following most likely describes the allusion to Dresden? A Dresden was the center for the production of weapons that supported the German war effort. B Dresden was a city rich with old

    asked on May 17, 2011
  41. Statistics

    The amount of fill(weight of contents)put into a glass jar of spaghetti sauce is normally distributed with mean=850g and standard deviation=8g.the probability that a random sample of 24 jars has a mean weight greater than 848g is?need help

    asked on March 23, 2011
  42. math

    Write a missing addend addition sentence to help solve 78-49.explain how you would use it.

    asked on January 2, 2011
  43. geometry sem 2 APEX

    Question 1 of 10 Multiple Choice: Please select the best answer and click "submit." A closet contains 8 pairs of pants, 10 shirts, and 4 pairs of shoes. How many leaves on a tree diagram would represent all possible combinations of outfits? A. 80 B. 22 C.

    asked on March 14, 2018
  44. Geometry

    Can you tell em if this is right? If not, can you tell me what words go where? A truth value statement can be written in the form “if P, then Q.” This “if, then” statement can be true or false. The “if” part is called the hypothesis, and the

    asked on October 9, 2012
  45. lit

    Jocelyn asked her mom, "What was it like when you were a child?" Did I punctuate correctly?

    asked on May 10, 2011
  46. Physics

    A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what

    asked on February 2, 2011
  47. Social Studies

    What is Nunavut's nickname and motto? Scroll down to the weather section of this site for Nunavut's nickname. (Broken Link Removed) This site has its motto.

    asked on February 8, 2007
  48. Maths

    A right circular cone is circumscribed about a sphere of radius a .If h is the distance from the centre of the sphere to the vertex of the cone. Show that the volume of the cone is 1/3pi a^2(a+h)^2/(h-a). Find the angle of a cone when the volume is minimum

    asked on August 9, 2016
  49. Math

    The Distributive Property: Find the product mentally. Show the steps you used. 8*34 I know that 8*34=272 but how you do it with Distributive Property? Thanks!

    asked on January 28, 2016
  50. One SS Question!

    What was one event that helped make the US a world power? a. The country experienced the Great Depression. b. The country fought in World War I *** c. The country the Peace of Paris. d. The country fought in the French and Indian War.

    asked on January 26, 2016
  51. Chem

    The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.

    asked on April 4, 2013
  52. lit

    When Marcos walked into the room, we turned on the lights and yelled, "Happy birthday!" is this correct punctuation?

    asked on May 10, 2011
  53. math

    Tyrell says $750 is about $800.Sara says $750 is about $700.who is correct?explain.

    asked on September 22, 2010
  54. Math

    the question is to "rotate the line the given number of degrees a about the x-intercept and (b) about the y-intercept. Write the equation of each image" and the problem is y=2x+2 ; 90 degrees and i dont know what to do

    asked on April 3, 2018
  55. math

    If Matt filled a 2 1/5 cup container, how many 1/5 cups would he need to use??

    asked on February 12, 2015
  56. Physics

    1 Angstrom = how many Coulombs?

    asked on August 29, 2014
  57. Physics

    An infinitely long thin metal strip of width w=12cm carries a current of I=10A that is uniformly distributed across its cross section. What is the magnetic field at point P a distance a=3cm above the center of the strip? I have tried using the integration

    asked on April 4, 2014
  58. lit

    "Maybe we should wait to begin until everyone is seated," Ana said to her band mates. did I punctuate this correctly?

    asked on May 10, 2011
  59. lit

    Antony invited us over to check out his, "awesome new board." is this correct

    asked on May 10, 2011
  60. Lit class

    Did I punctuate this correctly? "Daddy, why is the sky blue?" Martinique asked her father. the quotation mark goes behind the question mark right?

    asked on May 10, 2011
  61. Algebra

    6x²y³ + 9x²y³ 15x²y³ ------------- = ---------- 3x²y² 3x²y² = (15/3) (x²/x²) (y³/y²) = 5y Just want it to know if is correct, but don't y³ + y³ = 2y³? I'm confused now. Can someone please help? yes, the answer is 5y and yes, y³ + y³ =

    asked on August 15, 2007
  62. Math

    A water tank can hold 56 5/7 litres of water. How much water is contained when it is 2/5 full?

    asked on July 26, 2018
  63. physics

    A locomotive is running at a constant speed of 100 km/ h. The diameter of driving wheels is 1.8 m. The stroke of the piston of the steam engine cylinder of the locomotive is 600 mm. Find the centripetal acceleration of the crank pin relative to the engine

    asked on December 31, 2014
  64. Ohysics

    An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b.

    asked on September 19, 2010
  65. Math

    A doctor orders a dosage of 5 ml of medicine every 4 hours for 8 days how many fluid ounces of medicine should be purchased Help sole

    asked on April 27, 2018
  66. maths

    Prove that in any triangle ABC Sin2A+Sin2B+Sin2C/SinA+SinB+SinC=8Sin(A/2)Sin(B/2)Sin(C/2)

    asked on September 24, 2016
  67. Math

    A bus makes 28 stops every 2 hours. How many stops does it make in 3 hours? in 4 hours? How do you get 42 stops; 56 stops? Thanks!

    asked on September 10, 2015
  68. lit

    Copán is one of the most impressive sites for ruins of the ancient Maya civilization. Situated in western Honduras, Copán is where the great Maya civilization flourished. Though other Maya ruins have been found in neighboring countries, no other quite

    asked on May 17, 2011
  69. Statistics

    The null hypothesis,H0:u=48,was tested against the alternative hypothesis,H1:u>48.A sample of 75 resulted in a calculated p-value of 0.102.if standard deviation=3.5,the value of the sample mean is?need help

    asked on March 23, 2011
  70. Physics

    A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what

    asked on February 2, 2011
  71. Language Arts

    I need the complete predicate in this sentence? Ida B. Wells was born into slavery in 1862 in Holly Springs, Mississippi.

    asked on September 9, 2010
  72. english

    Which of the sentences below is an excerpt taken from "In Another Country" by Ernest Hemingway is an example of irony? A. My knee did not bend and the leg dropped straight from the knee to the ankle without a calf, and the machine was to bend the knee and

    asked on February 21, 2017
  73. science

    light that has a frequency of 1.5 x 1015 Hz.

    asked on October 9, 2015
  74. geometry

    Write a two-column proof. Given: 7y = 8x – 14; y = 6 Prove: x = 7

    asked on October 12, 2012
  75. Chem

    You have a 46.0 G sample of H20 at a temperature of -58.0*C. How many joules of energy are needed to heat the ice to 95.3*C?

    asked on May 14, 2012
  76. English

    I really need help with my writing. I need some to proof read a paper that I wrote. Two Career Families versus One Career Families Back in the early days the traditional working family was a one career family. The roles of husband and wife were defined and

    asked on January 28, 2012
  77. Statistics

    Of 100 people who were given a vaccine,80 developed immunity to a disease.the 98% interval on the proportion of people developing immunity is?need help

    asked on March 23, 2011
  78. Chemistry

    a 23ml H2SO4 solution is titrated by 50 ml 0.10 M NaOH solution, what is the molarity of H2SO4 solution? (Note that H2SO4 is a diprotic acid)

    asked on March 14, 2011
  79. trig

    what is the tan of 25 degrees and 01 minute

    asked on April 7, 2010
  80. s.s.

    Axum's conversion to Christianity a. beneficial b. a drawback c. first a drawback then beneficial d. first beneficial then a drawback

    asked on February 21, 2010
  81. physics

    There's a magic ring in a sealed paint can at the bottom of a frozen pond in the middle of a bog. YOu must get the ring via a plan which: gets you and equipment you need across without sinking, cross the frozen pond without breaking through the ice, lift

    asked on January 19, 2010
  82. precalculus

    Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)

    asked on January 12, 2010
  83. math

    March 1- $550 rent (check) March 2- $286 tuition (check) March 3- $200 paycheck March 4- 275 bookstore check March 5- $60 withdrawn from ATM March 6- $40 food (debit) March 7- $45 date desert March 8- N/A March 9- $40 gas March 10 - $200 paycheck March 11

    asked on April 19, 2018
  84. math

    A cold front moves through your hometown in January, dropping the temperature an average of 3 F per day for 5 days. Write an expression that uses multiplication to describe the changes in temperature from the start to the end. Help solve

    asked on April 19, 2018
  85. Math

    The temperature in Minot, North Dakota registered 18 degrees F. The wind chill factor made it feel negative 10 degrees. What is the difference between the actual temperature and the perceived temperature? Help solve

    asked on April 19, 2018
  86. Math

    Parmjit has 8 base ten blocks. She has at least one of each type of block. The value of her blocks is between 400 and 600. What blocks could she have? Find the possible answers using an organized list.

    asked on October 13, 2016
  87. Chemistry, due soon please help

    calculate the mass of 100 ppm of CO2 int the atmosphere if the atmospheres mass is 5.3x10^18 kg

    asked on December 16, 2013
  88. math problem

    The diameter of a circle is increased by enough to increase the circumference by 20%. By what % is the area of the circle increased ? ( Hint: Try a number like t=5.)

    asked on February 17, 2013
  89. Chemistry

    You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 379.0 ppm and is initially uniform through the thickness of the

    asked on December 14, 2012
  90. physics

    the moon orbits the earth in a circle (near enough) of radious 3.8x10^8 m, taking 27.3 days to make a complete orbit. what is the speed of the moon relative to the earth?

    asked on September 8, 2011
  91. mathsP5

    There are 2 packets of flour, Y & Z.The ratio of the mass of Y to Z is 4:1. If 26g is added to Z,the ratio of the mass of Y to Z is 7:5. Find the mass of the 2 packets at first. Pls show how to solve by model method as i have not learnt algebra. tks

    asked on August 20, 2011
  92. lit

    What did the philosopher Aristotle mean when he said, "To perceive is to suffer"? Did I punctuate correctly?

    asked on May 10, 2011
  93. lit

    My mom says "Never wear anything but a suit to a funeral or a wedding." is this correct punctuation?

    asked on May 10, 2011
  94. lit

    Ms. Sardelis said we must "absolutely and without delay" turn in our permission slips by tomorrow or we can't go on the class trip. is this correct

    asked on May 10, 2011
  95. Lit class

    I'm going to be asking for the help for all of us does this have correct punctuation? two of us said no and the other two says yes My mom says "Never wear anything but a suit to a funeral or a wedding."

    asked on May 10, 2011
  96. algebra

    Select the set of equations that represents the following situation: Mary invested one amount at 7% simple interest, and a second amount at 5% interest, earning $29.80 in one year. If she had switched the amounts, she would have earned $35.00. What were

    asked on February 22, 2011
  97. Physics

    A Force,F=10N,applied at an angle of 37 degree above the horizontal,moves a crate a distance of 5m along a rough horizontal surface.A frictional force of 5N opposes the motion.what is the change in kinetic energy?

    asked on February 18, 2011
  98. Math

    Two sides of a triangle have the same length. The third side measures 4 meters less than twice the common length . The perimeter of the triangle is 16 meters. What are the lengths of the three sides?

    asked on November 7, 2010
  99. Science

    "Describe the role of gravity as the force that governs the movement of the solar system and the universe." I don't get it.

    asked on September 27, 2010
  100. Physics

    A lightning bug flies at a velocity of 0.25m/s due east toward another lightning bug seen off in the distance. A light breeze blows from the east on the bug at a velocity of 0.25m/s. What is the resultant velocity of the lightning bug? Please direct me to

    asked on September 15, 2010


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