doug

Popular questions and responses by doug
  1. Physics

    A certain freely falling object, released from rest, requires 1.40 s to travel the last 20.5 m before it hits the ground. (a) Find the velocity of the object when it is 20.5 m above the ground. (Indicate the direction with the sign of your answer. Let the

    asked on September 3, 2018
  2. Physics

    A horse is harnessed to a sled having a mass of 231 kg, including supplies. The horse must exert a force exceeding 1250 N at an angle of 36.3° (above the horizontal) in order to get the sled moving. Treat the sled as a point particle. HINT - Use the

    asked on October 2, 2018
  3. carpentry

    Two carpenters are discussing the building codes that apply to staircases. Carpenter A says that most building codes require a minimum of 6′2″ of headroom for stairways. Carpenter B says that a flight of stairs that has a vertical distance of 12′ or

    asked on December 15, 2018
  4. science

    spent steam from an electric generating plant leaves the turbines at 120.0 C and is cooled to 90. 0 C liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling tower water for each kg of spent steam?

    asked on October 13, 2011
  5. Physics

    A block of mass 57.1 kg rests on a slope having an angle of elevation of 28.3°. If pushing downhill on the block with a force just exceeding 162 N and parallel to the slope is sufficient to cause the block to start moving, find the coefficient of static

    asked on October 2, 2018
  6. Physics

    Consider the figure below. www.webassign.net/sercp9/4-p-017-alt.gif (a) Find the tension in each cable supporting the 688-N cat burglar. (Assume the angle θ of the inclined cable is 38.0°.) inclined cable - ??? horizontal cable - ??? vertical cable - ???

    asked on October 2, 2018
  7. math

    When the product of 6 and the square of a number is increased by 5 times the number, the result is 4. Which equation represents this situation? 6x2 + 5x - 4 = 0 6x2 + 5x + 4 = 0 62x + 5 + x = 4 6 + x2 + 5x = 4

    asked on May 30, 2017
  8. social studies

    name two things colonial leaders offered to attract settlers

    asked on September 1, 2011
  9. Algebra

    A plane takes off from an airport and flies east at a speed of 350 mph. Ten minutes later, a second plane takes off from the same airport and flies east at a higher altitude at a speed of 400 mph. How long does it take the the second plane to overtake the

    asked on September 7, 2015
  10. OChem

    A mixture of acetone and ethyl acetate of unknown ratio begins to boil at 65 degrees celcius (760 torr). What is the composition of this binary mixture in terms of the mole fraction of acetone and that of ethyl acetate?

    asked on September 25, 2010
  11. math

    A carpenter is trying to determine how many squares of shingles will be needed for a roofing job. Both sides of the gable roof are the same size, and one side of the roof measures 15′ × 30′. How many squares of shingles would be needed to cover both

    asked on December 22, 2018
  12. math

    1. If both sides of a gable roof are the same size, and one side of the roof measures 15′ × 36′, how many squares of 16″ × 5/2″ wooden shingles will be needed to cover this roof? The shingles will be applied with a weather exposure of 5″.

    asked on December 22, 2018
  13. math

    Calculate the length of a collar tie for the following conditions: The collar tie is 3′ above the top plate, the unit rise of a common rafter in the roof is 10′, and the span of the building is 20′. A. 16′43/4″ ***B. 12′ 91/2″ C. 14′ D.

    asked on December 8, 2018
  14. Physics

    What is the acceleration of the upper block? The coefficient of kinetic friction between the lower block and upper block is 0.0005. The coefficient of kinetic friction between lower block and floor is 0.0001. Upper block is 1kg, lower block is 2kg, and

    asked on May 25, 2010
  15. english

    In the third century, bands of savage barbarians repeatedly broke through the frontier defenses of the Roman province of Gaul,_________the countryside with fire and sword, and either slew or carried off the____ a. scanned..partisans b. pacified..vagabonds

    asked on December 11, 2012
  16. Chemistry

    What is the net ionic equation for the ionization of HClO3 in water?

    asked on May 10, 2010
  17. carpentry, math

    Determine the number of board feet required for joists on a one-story house 30′ × 40′, in which 2 × 8 joists will be placed 16″ OC. A. 2,052 B. 1,224 C. 1,632 D. 1,536 I honestly don't know what formula to use for this. Everything I see online

    asked on November 18, 2018
  18. math

    A rectangular building measures 64′ in length and 32′ in width. If the wall studs will be spaced at 16″ OC, what would be the total number of studs needed for the exterior wall of this building? A. 186 B. 212 C. 204 ***D. 192 I believe the answer to

    asked on December 8, 2018
  19. carpentry, math

    3. A rectangular building measures 42′ in length and 24′ in width. The four exterior walls have a sill-to-top-plate distance of 9′. How many 4 × 8 sheets of plywood sheathing would be needed to cover the four exterior walls of this building? (Note:

    asked on November 20, 2018
  20. Physics

    A boy exerts a horizontal force of 111 N on a box with a mass of 32.7 kg. HINT - (a) Make a free-body diagram and apply the x-component of Newton's second law. (b) Apply the relationship between static friction and the normal force. (a) If the box doesn't

    asked on October 2, 2018
  21. Precal

    If 80 percent of radioactive element is left after 250 years, then what percent remains after 600 years? What is the half life of the element?

    asked on December 11, 2014
  22. math

    A single-acting swing door is 36″ wide. The door frame is made of rabbeted stock. What length should the head jamb be? A. 36 1 1/16″ B. 36 19/32″ C. 36 3/32″ D. 36 3/16″ Is it A?

    asked on December 27, 2018
  23. math

    A carpenter needs to calculate the correct length of the wall studs for a platform-frame construction. The building will have a finished floor-to-ceiling height of 7′8½″, a 1″-thick finish floor, ¾″ furring strips in the ceiling, and ½″ gypsum

    asked on December 3, 2018
  24. Physics

    A small mailbag is released from a helicopter that is descending steadily at 2.58 m/s. (a) After 3.00 s, what is the speed of the mailbag? v = 32.01 Correct: Your answer is correct. m/s (b) How far is it below the helicopter? d = 41.9 ?????????????/

    asked on September 3, 2018
  25. carpentry

    Everything in brackets are my answers. Are these correct? 1. A carpenter needs to attach a piece of small, decorative molding to an oak staircase. Which of the following tools would be the best choice for this job? A. Light-duty nailer B. Framing nailer

    asked on November 15, 2018
  26. math

    6. What is the length of wall studs when the finished floor-to-ceiling height is 8′, ceiling material is ¾″ thick, the finished floor is ¾″ thick, and it's framed with three plates? A. 7′9″ ***B. 8′1½″ C. 8′ D. 7′7½″ I think the

    asked on December 7, 2018
  27. carpentry, math

    1. Determine the number of board feet required for joists on a one-story house 30′ × 40′, in which 2 × 8 joists will be placed 16″ OC. A. 2,052 B. 1,224 C. 1,632 D. 1,536 I believe the answer is B. 1,224 -- 2. A 4 × 12 built-up girder is 30″.

    asked on November 19, 2018
  28. carpentry, math

    9. A carpenter needs to determine how many plywood subflooring panels will be needed for a particular job. The area that needs to be covered measures 24′ × 48′. How many 4 × 8 plywood subfloor panels would be needed to cover this area? [A. 36] B. 32

    asked on November 18, 2018
  29. math

    carpenter is trying to determine how many squares of shingles will be needed for a roofing job. Both sides of the gable roof are the same size, and one side of the roof measures 15′ × 30′. How many squares of shingles would be needed to cover both

    asked on December 18, 2018
  30. carpentry

    The plans for a building you're working on call for the installation of a 10″-thick concrete block wall. The usual size for a footing that would be used with such a wall would be 8″ deep by _______ wide. A. 18″ B. 16″ C. 24″ D. 20″ Is it C?

    asked on November 15, 2018
  31. carpentry, math

    2. A 4 × 12 built-up girder is 30″. How many board feet does this girder contain? (Round your answer to the nearest whole number.) A. 107 B. 312 C. 128 D. 96 I think the answer is C.128. -- 3. Calculate the number of hours needed to frame a one-story

    asked on November 19, 2018
  32. math

    What is the length of wall studs when the finished floor-to-ceiling height is 8′, ceiling material is ¾″ thick, the finished floor is ¾″ thick, and it's framed with three plates? A. 7′9″ B. 8′1½″ C. 8′ ***D. 7′7½″ My instructor told

    asked on December 17, 2018
  33. Physics

    A car starts from rest and travels for 7.0 s with a uniform acceleration of +3.0 m/s2. The driver then applies the brakes, causing a uniform acceleration of −2.5 m/s2. If the brakes are applied for 2.0 s, determine each of the following. How far has the

    asked on August 29, 2018
  34. physics

    A sphere has a radius of 0.20 meters and has a uniform surface charge density equal to 6.3 micro coulombs per meter squared. A second point charge has a magnitude of 0.58 micro coulombs and is 0.61 meters away from the center of the sphere. Find the

    asked on March 17, 2012
  35. math

    Using the unit-length method, calculate the total theoretical length of a rafter if the unit rise is 18″, the span is 8′, and the total run is 4′. A. 86.52″ B. 173.04″ C. 21.63″ D. 64.89″ Is it C?

    asked on November 27, 2018
  36. Chemistry

    1. When the hydrochloric acid is added to the calcium carbonate, will there be an excess of HCl(aq) or CaCO3(aq) or will there be stoichiometric equivalents of the two? Show your calculations. 2. In this lab, you will use a 50mL buret and ~0.3M NaOH (aq).

    asked on October 11, 2017
  37. carpentry, math

    A rectangular building measures 64′ in length and 32′ in width. If the wall studs will be spaced at 16″ OC, what would be the total number of studs needed for the exterior wall of this building? A. 186 B. 212 C. 204 D. 192 Would the answer be 192?

    asked on November 19, 2018
  38. Math

    The number of daylight hours in a day is harmonic. Suppose that in a particular location, the shortest day of the year has 7 hours of daylight and the longest day of the year has 18 hours. Then, we can model its motion with the function N=Asin(Bt) + C

    asked on September 28, 2009
  39. math

    A rectangular building measures 42′ in length and 24′ in width. The four exterior walls have a sill-to-top-plate distance of 9′. How many 4 × 8 sheets of plywood sheathing would be needed to cover the four exterior walls of this building? (Note:

    asked on December 10, 2018
  40. carpentry, math

    A carpenter is trying to calculate the number of individual risers that a staircase will contain. The total rise of the staircase will be 11′. Assuming an individual riser height of 8″, what is the minimum number of risers that will be needed for this

    asked on November 19, 2018
  41. Trigonometry

    The number of daylight hours in a day is harmonic. Suppose that in a particular location, the shortest day of the year has 7 hours of daylight and the longest day of the year has 18 hours. Then, we can model its motion with the function N=Asin(Bt) + C

    asked on September 28, 2009
  42. Algebra

    An inheritance of $19,000 was divided among three investments yielding a total of $1490 in simple interest per year. The interest rates for the three investments were 5%, 7%, and 10%. The 5% and 7% investments were $4000 and $1000 less than the 10%

    asked on September 12, 2013
  43. Statistic

    I am getting problems with my calculations. For the first part of the question I got 68 when I try another calculation I got 1. One of the method used was Degree of freedom =(r-1)(c-1). TABLE 12-7 The director of transportation of a large company is

    asked on October 24, 2010
  44. Physics

    An object moving with uniform acceleration has a velocity of 10.0 cm/s in the positive x-direction when its x-coordinate is 2.91 cm. If its x-coordinate 1.85 s later is −5.00 cm, what is its acceleration?

    asked on August 29, 2018
  45. English

    I'm having trouble with transitive and intransitive verbs. I have to pick out the verb and tell if it's transitive or intransitive. Some reach a height of 120 feet. reach=intransitive The stems measure a foot in diameter. measure=intransitive

    asked on October 18, 2010
  46. Physics

    An object moving with uniform acceleration has a velocity of 10.0 cm/s in the positive x-direction when its x-coordinate is 2.91 cm. If its x-coordinate 1.85 s later is −5.00 cm, what is its acceleration?

    asked on August 29, 2018
  47. ss

    what mountain range runs along the western coast of south america?

    asked on February 28, 2008
  48. Chemistry

    Calculate the work done when 70.0g of tin dissolves in excess acid at 3.00 atm and -15.0 C. Sn(s)+2H^+(aq) -> Sn^2+(aq)+H2(g) Assume ideal gas behavior. Any ideas? I've come up with a few different answers and can't come to a conclusion. I see the

    asked on September 15, 2006
  49. math

    What is the smallest distance between the origin and a point on the graph of $y=(x^2-3)/(sqrt{2})

    asked on March 5, 2017
  50. English

    I will try this again. I have to identify the verb and tell if it's transitive or intransitive. It is related to wheat, oats, and barley. is related=intransitive In Japan the hollow stems serve as water pipes. serve=intransitive

    asked on October 18, 2010
  51. chemistry

    when burned, methane gives off heat at a rate of 342 J/g. How many kilojoules of heat will be given off when 4.50 kg burns?

    asked on November 14, 2011
  52. Math

    determine vertex, focus and directrix of parabola. then graph the parabola. second equation: y^2 -4y -12x= 8 Please help me this is do 2day bc i forget to turn it in to my teacher

    asked on May 18, 2008
  53. public speaking

    Communicating effectively helps us to succeed in areas of?

    asked on April 9, 2015
  54. science

    The Earths Interior: "Ability of a solid to flow or change shape like a thick liquid." It is one word. The third letter is an (A)and it is 10 letters long. plasticity

    asked on January 9, 2007
  55. Physics

    A dockworker loading crates on a ship finds that a 25-kg crate, initially at rest on a horizontal surface, requires a 70-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 54 N is required to keep it moving

    asked on October 2, 2018
  56. physics

    a golf ball is observed to hit the ground 800 ft. away after a flight of 5 seconds. Assume that the ground is level and neglect friction of the air. Find the angle of elevation above the ground of the initial motion of the ball, find the initial velocity

    asked on July 28, 2015
  57. Chemistry

    N_2+3H_2-->2NH_3 How many grams of H_2 are needed to react with 3.20 grams of N_2

    asked on October 23, 2010
  58. Computer Programming

    How to recursively count how many positive numbers are in an array in java without ArrayList?

    asked on January 28, 2017
  59. physics

    Thank you Henry for helping me with my physics problem about the angle etc and the golf ball on 7/28.

    asked on July 29, 2015
  60. Math

    The formula Total cost = Cost + Shipping cost + Holding cost is used to find the total cost of a business asset. The formula can be written in symbols as T=C+S+H. Solve the formula for C, the cost of the asset.

    asked on July 15, 2015
  61. physics

    A baseball is thrown vertically upward with a speed of 17.8 m/s from a height of 1.11 m. How high does the ball rise from its original position?

    asked on September 18, 2014
  62. chemistry

    If you have 1.90 moles of H_2 How many grams of NH_3 can be produced?

    asked on October 23, 2010
  63. bio

    5. What is meant by the term “carbon fixation”? a. The release of CO2 from glucose during catabolism b. The delivery of CO2 to an enzyme required for the production of glucose c. The production of two 3-carbon molecules from one 6-carbon molecule d.

    asked on April 6, 2009
  64. Math

    determine vertex, focus and directrix of parabola. then graph the parabola. first equation: y^2 -2x-8=0 second equation: y^2 -4y -12x= 8 please show your work!

    asked on May 18, 2008
  65. microbiology

    In a solution, the substance present in the largest amount is referred to as the solvent. Consider adding one ounce of oil to one gallon of water. Using terms, such as solute, solvent, polar, non-pola

    asked on January 25, 2011
  66. physics

    The engineer of a Russian nuclear submarine lurking under the Arctic Sea reports an outside pressure of 35 ATM. How deep is the submarine? Neglect ice thickness.

    asked on September 30, 2010
  67. Algebra

    Solve and graph on a number line: -3 times the absolute value of 2x + 4 is greater than 6

    asked on September 7, 2015
  68. math

    from agroup of 18 kids how many ways can you choose a group of 4 to do a project

    asked on March 14, 2011
  69. bio

    4. In the Krebs cycle (or citric acid cycle), starting with citrate, what happens? a. Organic compounds become more reduced and CO2 is produced b. Organic compounds become more oxidized and CO2 is produced c. Some organic compounds become reduced and

    asked on April 6, 2009
  70. math

    determine vertex, focus and directrix of parabola. then graph the parabola. first equation: y^2 -2x-8=0 second equation: y^2 -4y -12x= 8

    asked on May 18, 2008
  71. Math

    determine vertex, focus and directrix of parabola. then graph the parabola. second equation: y^2 -4y -12x= 8

    asked on May 18, 2008
  72. Algebra

    Solve and graph on a number line: -3/2x + 4/ > 6

    asked on September 7, 2015
  73. English

    Slow Food vs. Fast Food Why is it better to buy local products for slow food? This is one of my bullets for an English essay.. I just need some guidance on how to set this up and main points.

    asked on October 5, 2010
  74. math

    Molly wants to purchase ribbon to make bows. Red ribbon costs $1.59 per yard and gold ribbon costs $2.70 per yard. How many yards of each type of ribbon can Molly purchase if she can spend at most $20 altogether?

    asked on October 9, 2016
  75. Legal

    How fast was a car driving when it applied its brakes after striking someone who remained on the hood, and did notcome to a stop for 153 feet, while descending a hill?

    asked on March 17, 2016
  76. algebra

    Two trains are on the same track heading for each other they're two miles apart wondering is going 30 miles per hour the other train is going 10 miles for how many minutes will it take before they meet each other?

    asked on February 20, 2016
  77. microbiology

    list the 5 main processes of diagnosis of a bacterial infection.

    asked on April 29, 2010
  1. English

    is correct or not

    posted on March 18, 2020
  2. English

    yo im going to trust u on this i am going to tell u guys if anonymous

    posted on March 18, 2020
  3. Art Help!!! Thank you

    cbd oil

    posted on March 15, 2020
  4. Science Please Help!

    suk it strong

    posted on March 15, 2020
  5. science

    yall have the corona virus man pinhead patrick

    posted on March 15, 2020
  6. American History

    I don't know but I'm about to try it

    posted on March 11, 2020
  7. history

    Big gulp aye alright well, see yu later".........by loyde from dumb and dumber

    posted on March 2, 2020
  8. language arts

    Mr krabs jacking off with mrs puff

    posted on February 25, 2020
  9. language arts

    Piece of shyit

    posted on February 25, 2020
  10. math

    The squares are 100 sq ft.

    posted on December 18, 2018
  11. math

    I am still not understanding.

    posted on December 10, 2018
  12. math

    For 6, they don't tell you the thickness of the three plates.

    posted on December 7, 2018
  13. carpentry, math

    I redid number 7 and I believe that one to be A.

    posted on November 20, 2018
  14. carpentry, math

    Is the answer B?

    posted on November 18, 2018
  15. carpentry, math

    I'm still not understanding.

    posted on November 18, 2018
  16. history

    A

    posted on October 2, 2018
  17. algebra

    Is it this question? 66) Erika spent 5/6 hr on her computer visiting the history channel and the discovery channel websites. She spent 1/3 hr at the history channel website. How many hours did she spend at the discovery channel website? A) 2/9 hr B) 7/9 hr

    posted on October 2, 2018
  18. Physics

    np

    posted on October 2, 2018
  19. Physics

    Plastic behavior: This permanent deformation behavior occurs when the tensile (or compressive) uniaxial stress reaches sy. Hard materials like diamond, nitrided steel and even most plastic are resistant to permanent deformation.

    posted on October 2, 2018
  20. Physics

    www.nde-ed.org/EducationResources/CommunityCollege/Materials/Mechanical/Tensile.htm

    posted on October 2, 2018
  21. Physics

    www.opentextbc.ca/physicstestbook2/chapter/elasticity-stress-and-strain/

    posted on October 2, 2018
  22. science

    The scenario could be prevented by two main ways: 1) Krystal should be more responsible in the lab 2) Carin should wear lab appropriate attire, including closed shoes To deal with this scenario: 1) Cain should wash her feet in the closest washing station

    posted on October 2, 2018
  23. Physics

    Hey, I did the calculations and got a - 1258.7 N b - 1.700 N c - 3350.739 N But, the website says the answer is wrong.

    posted on October 2, 2018