# Doug

Most popular questions and responses by Doug
1. ## 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

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

3. ## 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?

4. ## 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

5. ## 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″.

6. ## 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

7. ## 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 - ???

8. ## 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

9. ## 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

10. ## 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

11. ## 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.

12. ## 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?

13. ## 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

14. ## 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:

15. ## 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

16. ## 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

17. ## 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

18. ## 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

19. ## 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

20. ## 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?

21. ## 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?

22. ## Chemistry

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

23. ## 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″.

24. ## 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

25. ## 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

26. ## 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?

27. ## 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

28. ## 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

29. ## 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

30. ## 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:

31. ## 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?

32. ## 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?

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

34. ## 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

35. ## 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

36. ## math

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

37. ## 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

38. ## 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

39. ## 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

40. ## 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

41. ## 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!

42. ## ss

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

43. ## 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 ?????????????/

44. ## 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

45. ## 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

46. ## 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

47. ## 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?

48. ## 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).

49. ## 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%

50. ## 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?

51. ## chemistry

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

52. ## physics

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

53. ## 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.

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

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

56. ## 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?

57. ## 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.

58. ## math

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

59. ## Chemistry

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

60. ## 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.

61. ## 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.

62. ## 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

63. ## Math

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

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

65. ## 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

66. ## public speaking

Communicating effectively helps us to succeed in areas of?

67. ## 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?

68. ## social studies

name two things colonial leaders offered to attract settlers

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

70. ## Computer Programming

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

71. ## 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?

72. ## 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?

73. ## 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?

74. ## Algebra

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

75. ## Algebra

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

76. ## 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

77. ## microbiology

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

1. ## math

The squares are 100 sq ft.

posted on December 18, 2018
2. ## math

I am still not understanding.

posted on December 10, 2018
3. ## math

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

posted on December 7, 2018
4. ## carpentry, math

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

posted on November 20, 2018
5. ## carpentry, math

posted on November 18, 2018
6. ## carpentry, math

I'm still not understanding.

posted on November 18, 2018
7. ## history

A

posted on October 2, 2018
8. ## 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
9. ## Physics

np

posted on October 2, 2018
10. ## 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
11. ## Physics

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

posted on October 2, 2018
12. ## Physics

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

posted on October 2, 2018
13. ## 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
14. ## 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
15. ## chemistry

231.u

posted on December 6, 2017
16. ## math

3%

posted on November 6, 2017
17. ## Algebra 1

(1,3) AND (1,9)

posted on October 25, 2017
18. ## mathematies

33.33333 km in 3/2 hours

posted on May 15, 2017
19. ## Maths

One over three now right guys. That's the answer.

posted on February 27, 2017
20. ## math

yep. It's 13/225.

posted on August 31, 2016
21. ## science- physics

check your signs. The line is to the LEFT of the y axis.

posted on October 8, 2015
22. ## Science- RE-DO

5 is really a repeat of 3, and the answer there is c.

posted on October 7, 2015
23. ## Science- RE-DO

in 4, if dimples is dominant and the parent is homozygous, the parent has two dimple genes, so every offspring MUST get a dominant dimple gene from that parent.

posted on October 7, 2015