# 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

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. ## 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

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?

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

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 - ???

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

8. ## social studies

name two things colonial leaders offered to attract settlers

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

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?

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

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″.

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.

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

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

16. ## Chemistry

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

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

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

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:

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

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?

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?

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

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 ?????????????/

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

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

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″.

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

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

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?

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

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

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. ## 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

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?

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).

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?

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

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:

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

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

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%

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

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?

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

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?

47. ## ss

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

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

49. ## math

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

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

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?

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

53. ## public speaking

Communicating effectively helps us to succeed in areas of?

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

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

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

58. ## Computer Programming

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

59. ## physics

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

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.

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?

62. ## chemistry

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

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.

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!

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

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.

67. ## Algebra

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

68. ## math

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

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. ## 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

71. ## Math

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

72. ## Algebra

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

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.

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?

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?

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?

77. ## microbiology

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

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

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

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