Wednesday
July 30, 2014

Posts by John


Total # Posts: 6,199

Chemistry
Given that Kw for water is 2.4× 10–14 at 37 °C, compute the pH of a neutral aqueous solution at 37 °C, which is the normal human body temperature.

chemistry
[H+]= [ClO4-]= [OH-]=

physics
A car having an initial speed of 16 m/s is uniformly brought to rest in 4.0 s. How far does the car travel during this 4.0 s interval?

Calculus
Find the Critical Numbers? 1.) f(x) = 2x^3 + 3x^2 + 36x x=? 2.) g(t) = |5t − 4| t=?

math
For each right triangle, draw the rectangle made by drawing sides opposite the two shorter sides in the triangle. Find the area of each rectangle

physics
trying to raise a barrel using sections of pipe.The three objects are horizontal cylinders resting on level ground. The barrel has a mass of 100 kg and its diameter is 2.0m. Each pipe has a diameter of 0.50 m. What minimum horizontal force must his feet exert on the pipe to ra...

calculus
Find the volume of the solid formed by rotating the region in the 1st quadrant enclosed by the curves y= x^(1/4) and y= x/64 about the y-axis.

English
5. A and B above

math
I need help on the quistion17yd x [x+(-4)]min if the formula is d=rt

Socials
Is billy bishop's diary a primary source? Evaluate it as a historical source. Please help. Not quite sure what this means. don't understand what the second part is telling me to do. thanks.

Socials (URGENT)
Why did the canadian government feel the need to control the economy, transportation and trade after war was declared in 1914? Was this a genuine need? Explain. Hi, I need some help on the second half of the question. Was it a genuine need? I can't find the answer anywhere...

Quote
can anyone please explain what this quote means? thank you "Man is nothing else but what he makes of himself.” ~Jean-Paul Sartre

organic chem
Calculate Percent Composition of the Unknown Mixture : Methanol BP 64.7 Toluene Bp 110.6

Geometry
Vw is bisected by xy and xz at x creating 3 angles if m< vxy= 6x-14 and m<yxz=2x+5 and m<wxz=2x-1 find the degree measures <vxy, <yxz, and <wxz

biology genetics
In Leghorn chickens, + stands for colored feathers and C represents white feathers. At an independently inherited gene, the allele + inhibits color expression, whereas I has no effect on color expression

law
its Service

law
The legal business is a __________ industry. (Points: 5) regulatory statutory service judicial is it "Statutory"

law
what do you think about A? Does that make sense to you

law
For an attorney, one of the most common negative aspects of the contingency fee is: (Points: 5) a. that the client may not pay him. b. the high degree of risk involved in the litigation. c. that the costs may be too high. d. that the judge may not grant the payment. Is it (B)

law
An alternative to an hourly rate is a/an __________ rate. (Points: 5) cost advertised family fixed Is it "Fixed"

calculus
If a snowball melts so that its surface area decreases at a rate of 4 cm2/min, find the rate at which the diameter decreases when the diameter is 9 cm.

Chemistry
Using enthalpies of formation, calculate the quantity of heat produced when 14.0 g of propane is completely combusted in air under standard conditions.

Geography
Thnx alot. :L

Geography
I also need a river tees map from cross fell to North sea

Geography
I need to write about the river tees AND about the source to mouth. Please please help me :( I have to redo do it by monday and I can only use the computer for 30 more minutes! Please F'ing help ME.

calculus
Use linear approximation to estimate the amount of paint in cubic centimeters needed to apply a coat of paint cm thick to a hemispherical dome with a diameter of meters.

Calculus
2079

calculus
Yeah, I originally got 18.9 km/h, but the website is not accepting my answer. Is there something else?

calculus
That's not right...

calculus
At noon, ship A is 110 km west of ship B. Ship A is sailing east at 25 km/h and ship B is sailing north at 15 km/h. How fast is the distance between the ships changing at 4:00 PM?

calculus
find the volume of the spherical segment with diameter 20inches and a zone area of 160 pi in2

chemistry
a 30.0ml sample of diprotic acid is titrated with .260M KOH. if 68.5ml is required to reach the equivalence point, what is the concentration of the acid?

OChem
hahah lol, my names not even john, i know you dont know me, because i dont know you hahahahahaha

OChem
just kidding, idk

OChem
all of them

calculus
y = (ln x)^(cos4x) Use logarithmic differentiation to find the derivative of the function.

Physics
You swing a 3.24-kg object in a vertical circle of radius 0.920 m. The speed of the object at the top of the circle is 3.25 m/s; the speed of the object at the bottom of the circle is 6.90 m/s. Find the tension in the rope tied to the object at: a) The top of the circle b) The...

Physics
An object of mass 1.4kg is placed 11.5 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the object remains fixed on the turntable until a rate of 37 rpm is reached, at which point the object slides off. What is th...

physics
what is the net force needed to lift a full grocery sack weighing 210N uniformly?

Chemistry
How many milliliters of 0.250 M KMnO4 are needed to react with 3.36 g of Iron(II) sulfate, FeSO4? The reaction is as follows: 10FeSO4(aq) + 2KMnO4(aq) + 8H2SO4(aq) ¨ 5Fe2(SO4)3(aq) + 2MnSO4(aq) + K2SO4(aq) + 8 H2O(l

physics
An airplane flies 137 km due west from city A to city B and then 412 km in the direction of 46.5◦ north of west from city B to city C. What is the distance between city A and city C? Relative to city A, in what direction is city C? Answer with respect to due east, ...

calculus
Can anyone else elaborate?

calculus
y sin 12x = x cos 2y, (pi/2, pi/4) Find the tangent line to the curve at the given point. y=???

physics
What minimum force F must be exerted on the 4.1 kg cart in order for the 0.4 kg block not to fall? |--------| F |--------||-.4-| ------>|---4.1--| |--------| |--------| u=.49 between 4.1kg and .4 kg block

Math
Please show work. 9 1/10 + 7 2/5

Math
thank you

Math
Expressions please help p less than 5 p greater than 10 9 times the sum of p and 6

College Chemistry
What is the final temperature, in oC, after a 26.5 g piece of ice, at 0oC, is placed in a styrofoam cup with 122 g of water initially at 73.8oC the specific heat of water = 4.184 JK-1g-1 The heat of fusion of ice = 333 Jg-1

Chemistry
Ethanol (C2H5OH) boils at a temperature of 78.3oC. What amount of energy, in joules, is necessary to heat to boiling and then completely vaporize a 28.6 g sample of ethanol initially at a temperature of 10.8oC. The specific heat of ethanol is approximately constant at 2.44 JK-...

physics
What is its velocity when it returns to the level from which it started? Answer in units of m/s

chemistry
How many moles of oxygen combined with aluminum to form 3.8 moles of AL2O3?

college algebra
SKILL MAINTENANCE. Calculate: 2b + 8 – 3b = 10 + 11b – 2 – 12b

Statistics, Finance
If the distribution of returns for an asset has a variance of zero, then covariance of returns between that asset and the returns any other asset must equal zero. True or False

Chemistry
thanks DrBob222

Chemistry
How much 1,2-dibromocyclohexane should be obtained by adding bromine in carbon tetrachloride to 1g of cyclohexene

chemistry
How many grams of potassium permangate are needed to decolorized 1g of 2-pentene in basic solution

Socials
If I were to write an essay on the economic problems of developing countries, what should I write about? Please help. thanks.

college chem
Ethanol (C2H5OH) boils at a temperature of 78.3oC. What amount of energy, in joules, is necessary to heat to boiling and then completely vaporize a 20.0 g sample of ethanol initially at a temperature of 13.6oC. The specific heat of ethanol is approximately constant at 2.44 JK-...

physics
John is driving at 25m/s. When he brakes, he accelerates at the rate of -5.0m/s^2. How much time did it take him to stop? How far does it take him to stop?

physics
A 747 jetliner lands and begins to slow to a stop as it moves along the runway. The mass is 3.1 105 kg, its speed is 25.5 m/s, and the net braking force is 4.24 105 N.(a) What is its speed 7.45 s later?How far has it traveled in this time?

Physics
A plane weighing 220 kN (25 tons) lands on an aircraft carrier. The plane is moving horizontally at 67 m/s (150 mi/h) when its tail hook grabs hold of the arresting cables. The cables bring the plane to a stop in a distance of 84 m. (a) How much work is done on the plane by th...

physics
Two gears A and B are in contact. The radius of gear A is twice that of gear B. (a) when A’s angular velocity 6.00 Hz counter clockwise, what is B’s angular velocity? (b) If A’s radius to the tip of the teeth is 10.0 cm what is the linear speed of a point on the...

physics
The Earth rotates on its own axis once per day (24.0h). What is the tangential speed of the summit of Mt. Kilimanjaro (elevation 5895 m above sea level), which is located approximately on the equator, due to rotation of the Earth? The equatorial radius of Earth is 6378 km.

physics help
in a local diner a customer slides an empty coffee cup down the counter for a refill. the cup slides off the counter and strikes the floor at a distance d from the base of the counter. if the height of the counter is h. a) find an expression for the time t it takes the cup to ...

Physics
A motorist traveling at 15 m/s encounters a deer in the road 39 m ahead. If the maximum acceleration the vehicle’s brakes are capable of is −6 m/s2, what is the maximum reaction time of the motorist that will allow her or him to avoid hitting the deer? Answer in uni...

GPA
Can you give me a GPA chart. Please Thank You !!!

Math
Find f(infinity) for the complex function: f(z) = (iz-5)/(8z+3i) Thanks, John

Science
Can someone please help Thank you. What are the main goals and strategies of green intelligence?

Science
Can someone please help me out with these two questions below thank you. 1. What waste disposal methods are available to humans and how might they be more effective? 2. What initiatives or incentives could governments create to better equip citizens for managing their own wast...

physics
Steve, you are an idiot. A physics problem and why would you assume he threw up. No answer is easy like that.

calculus
what does 4 ( x - 5 ) = 4x - 20 equal if x equals 7

Algebra 1
290 miles

School in General
I was woundering on how exactly grades were curved normally. When instructors apply curves what is generally done? What happens if there's one person in a course that has a perfect score and the rest have like 80% of the points given out during the course. I was just wound...

English (MLA format)
Hi, I was wondering what was the most proper way to incorporate a quote from a piece of work that is a quote from another piece of work. If this makes no sense... in my paper I'm quoting a quote from a document that we have discussed in class. Within this document the auth...

Jiska hw help
How do i change my user's color ?

Science
What causes a chemical bond to form between atoms ?

Math
1170 students are going on trip. they are flying on 138 seat planes. all students must go and all must be seated. how many planes are needed to transport all of the students ?

hmyhss manjeri
he is right it doesn't

science
thanks

science
what causes a chemical bond to form between atoms ?

math
ja but all the passengers must go

math
there are 1170 students and all need to go on a trip. they will be flying on 138 seat planes. hm planes are neded to transport all the students.

Algebra
find any intercepts then graph the linear equation -x+3y=9

social studies
I believe its A but not sure.

social studies
The study of sensation and perception is important to a psychologist because perception and sensation are the foundation of: A-neurotransmitters and the brain's function. B-memory and how it is experienced in the world. C-the science of neuropsychology. D-learning, thinkin...

social studies
:) thank you! D

social studies
Humans rely most heavily on the sense of __________, because evolution designed us to be more active during the daytime than at night. A-taste B-touch C-hearing D-sight

psychology
I believe it is neurotransmitters and the brain´s function. I just need a second opinion. Thank you

psychology
The study of sensation and perception is important to a psychologist because perception and sensation are the foundation of: neurotransmitters and the brain's function. memory and how it is experienced in the world. the science of neuropsychology. learning, thinking, and a...

math
A cubic yard is 3 feet long by 3 feet wide by 3 feet tall. (Part A) How many cubic feet are in 1 cubic yard? (Part B) Landscaping mulch costs &1 per cubic foot. What is the cost for 3 cubic yards of landscaping mulch?

Physics
An air track glider, 8.0 cm long, blocks light as it goes through a photocell gate. The glider is released from rest on a frictionless inclined track and the gate is positioned so that the glider has travelled 96 cm when it is in the middle of the gate. The timer gives a readi...

geometry
ab is parallel to cd are cut by transversal ef find m<5 when m<3=80

physics
A person walks 41° north of east for 3.77 km. How far would another person walk due north and due east to arrive at the same location?

Science
Please help Thank you. Do you think we should have a special tax or a onetime payment that all people make to help improve air quality? Or should this be something that our government should budget on their own? Please answer in 100 words or more Thank you.

physics
An airplane needs at least 145 meters of runway to take off. If the plane starts from rest and accelerates uniformly to a take-off speed of 170 km/hr then what is its acceleration in meters/second? How long does it take for the plane to become airborne?

Physics
An air track glider, 8.0 cm long, blocks light as it goes through a photocell gate. The glider is released from rest on a frictionless inclined track and the gate is positioned so that the glider has travelled 96 cm when it is in the middle of the gate. The timer gives a readi...

Science
Please Help Thank you. If you had to argue the benefits of wind energy, what would they be? and What are the risks? can you please answer these question in 120 words or more Thank you.

Physics
A drag racer crosses the finish line of a 400.0-m track with a final speed of 104 m/s. (a) Assuming constant acceleration during the race, find the racer’s time and the minimum co efficient of static friction between the tires and the road. (b) If, because of bad tires or...

Physics
An air track glider, 8.0 cm long, blocks light as it goes through a photocell gate. The glider is released from rest on a frictionless inclined track and the gate is positioned so that the glider has traveled 96 cm when it is in the middle of the gate. The timer gives a readin...

Physics
In a movie, a stuntman places himself on the front of a truck as the truck accelerates. The co efficient of friction between the stuntman and the truck is 0.65. The stuntman is not standing on anything but can “stick” to the front of the truck as long as the truck co...

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