doug
Popular questions and responses by doug
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 
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 
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 
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 
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 
Physics
Consider the figure below. www.webassign.net/sercp9/4p017alt.gif (a) Find the tension in each cable supporting the 688N cat burglar. (Assume the angle θ of the inclined cable is 38.0°.) inclined cable  ??? horizontal cable  ??? vertical cable  ???
asked on October 2, 2018 
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 
social studies
name two things colonial leaders offered to attract settlers
asked on September 1, 2011 
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 
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 
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 
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 
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 
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 
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 
Chemistry
What is the net ionic equation for the ionization of HClO3 in water?
asked on May 10, 2010 
carpentry, math
Determine the number of board feet required for joists on a onestory 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 
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 
carpentry, math
3. A rectangular building measures 42′ in length and 24′ in width. The four exterior walls have a silltotopplate 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 
Physics
A boy exerts a horizontal force of 111 N on a box with a mass of 32.7 kg. HINT  (a) Make a freebody diagram and apply the xcomponent 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 
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 
math
A singleacting 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 
math
A carpenter needs to calculate the correct length of the wall studs for a platformframe construction. The building will have a finished floortoceiling height of 7′8½″, a 1″thick finish floor, ¾″ furring strips in the ceiling, and ½″ gypsum
asked on December 3, 2018 
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 
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. Lightduty nailer B. Framing nailer
asked on November 15, 2018 
math
6. What is the length of wall studs when the finished floortoceiling 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 
carpentry, math
1. Determine the number of board feet required for joists on a onestory 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 builtup girder is 30″.
asked on November 19, 2018 
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 
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 
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 
carpentry, math
2. A 4 × 12 builtup 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 onestory
asked on November 19, 2018 
math
What is the length of wall studs when the finished floortoceiling 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 
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 
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 
math
Using the unitlength 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 
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 
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 
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 
math
A rectangular building measures 42′ in length and 24′ in width. The four exterior walls have a silltotopplate 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 
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 
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 
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 
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 =(r1)(c1). TABLE 127 The director of transportation of a large company is
asked on October 24, 2010 
Physics
An object moving with uniform acceleration has a velocity of 10.0 cm/s in the positive xdirection when its xcoordinate is 2.91 cm. If its xcoordinate 1.85 s later is −5.00 cm, what is its acceleration?
asked on August 29, 2018 
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 
Physics
An object moving with uniform acceleration has a velocity of 10.0 cm/s in the positive xdirection when its xcoordinate is 2.91 cm. If its xcoordinate 1.85 s later is −5.00 cm, what is its acceleration?
asked on August 29, 2018 
ss
what mountain range runs along the western coast of south america?
asked on February 28, 2008 
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 
math
What is the smallest distance between the origin and a point on the graph of $y=(x^23)/(sqrt{2})
asked on March 5, 2017 
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 
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 
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 
public speaking
Communicating effectively helps us to succeed in areas of?
asked on April 9, 2015 
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 
Physics
A dockworker loading crates on a ship finds that a 25kg crate, initially at rest on a horizontal surface, requires a 70N 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 
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 
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 
Computer Programming
How to recursively count how many positive numbers are in an array in java without ArrayList?
asked on January 28, 2017 
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 
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 
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 
chemistry
If you have 1.90 moles of H_2 How many grams of NH_3 can be produced?
asked on October 23, 2010 
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 3carbon molecules from one 6carbon molecule d.
asked on April 6, 2009 
Math
determine vertex, focus and directrix of parabola. then graph the parabola. first equation: y^2 2x8=0 second equation: y^2 4y 12x= 8 please show your work!
asked on May 18, 2008 
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, nonpola
asked on January 25, 2011 
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 
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 
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 
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 
math
determine vertex, focus and directrix of parabola. then graph the parabola. first equation: y^2 2x8=0 second equation: y^2 4y 12x= 8
asked on May 18, 2008 
Math
determine vertex, focus and directrix of parabola. then graph the parabola. second equation: y^2 4y 12x= 8
asked on May 18, 2008 
Algebra
Solve and graph on a number line: 3/2x + 4/ > 6
asked on September 7, 2015 
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 
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 
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 
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 
microbiology
list the 5 main processes of diagnosis of a bacterial infection.
asked on April 29, 2010

English
is correct or not
posted on March 18, 2020 
English
yo im going to trust u on this i am going to tell u guys if anonymous
posted on March 18, 2020 
Art Help!!! Thank you
cbd oil
posted on March 15, 2020 
Science Please Help!
suk it strong
posted on March 15, 2020 
science
yall have the corona virus man pinhead patrick
posted on March 15, 2020 
American History
I don't know but I'm about to try it
posted on March 11, 2020 
history
Big gulp aye alright well, see yu later".........by loyde from dumb and dumber
posted on March 2, 2020 
language arts
Mr krabs jacking off with mrs puff
posted on February 25, 2020 
language arts
Piece of shyit
posted on February 25, 2020 
math
The squares are 100 sq ft.
posted on December 18, 2018 
math
I am still not understanding.
posted on December 10, 2018 
math
For 6, they don't tell you the thickness of the three plates.
posted on December 7, 2018 
carpentry, math
I redid number 7 and I believe that one to be A.
posted on November 20, 2018 
carpentry, math
Is the answer B?
posted on November 18, 2018 
carpentry, math
I'm still not understanding.
posted on November 18, 2018 
history
A
posted on October 2, 2018 
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 
Physics
np
posted on October 2, 2018 
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 
Physics
www.ndeed.org/EducationResources/CommunityCollege/Materials/Mechanical/Tensile.htm
posted on October 2, 2018 
Physics
www.opentextbc.ca/physicstestbook2/chapter/elasticitystressandstrain/
posted on October 2, 2018 
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 
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