Tuesday
February 9, 2016

# Posts by Tom

Total # Posts: 1,252

chemistry help!!
How do I calculate the average Z molar mass, 1/n (Summation) of n*M given this data: (Ave molar mass, mass of sample): (7.5,9.6) , (12.5,8.7), (17.5, 8.9), (22.5, 5.6), (27.5, 3.1), (32.5,1.7) mili moles for repective numbers: 1.3,.7,.51,.25,.11,.052 TOTAL: 2.92 I don't ...
February 24, 2015

physics/chemistry
mistake, multiplying by 2 in the math is for a bubble and not a cavity >_>
February 22, 2015

physics/chemistry
how does one calculate the work done by a spherical bubble with radius r in a liquid with a surface tension of T. I understand for a cavity it is 8pi(r)T, would you just double it to get 16pi(r)T because there are 2 films? here's the math....2(4pi((r)+dr)^2 -4pir^2) for a ...
February 22, 2015

Math Ms Sue
a book with an area of 88 square inches. what would the length and width of the book.
February 18, 2015

Calculus Chain rule
How did you get an exponent of 6??
February 17, 2015

Calculus Chain rule
How can derive this function?f(x) = 2/(9x^5+1)^5 The answer is The answer is -450x^4/(9x^5+1)^6 Can you please show why? Thank you
February 17, 2015

Math
Three eighths of the cast in a musical have to sing. What fraction of the cast does not have to sing?
February 12, 2015

chemistry
given relative permitivity of water, how much energy (kj/mol) is required to break the hydrogen bond in water? (Er=80.0)
February 8, 2015

Vectors/Scalars?
the dot product of 2 vectors is always a scalar. the difference between the two is that the scalar doesn't have direction, yes.
February 8, 2015

chemistry
how do I calculate the area occupied by one single molecule, given # of molecules per meter^2 (9.6e15), the Molarity? (.1 m/dm^3) and surface excess? (1.6e-8)
February 8, 2015

phys chem
how much energy (kj/mol) is required to break the hydrogen bond in water (Er=80.0) (Er= Relative permitivity) I'm really not sure how to approach this, and if i need enthalpies of vaporization or not...
February 8, 2015

algebra
A simple random sample is drawn from a normally distributed population. The value of which of the following will not be known for certain but can be inferred?
February 5, 2015

math
Nvm i got it right. it was 1.73
February 2, 2015

math
what numbers when you multiply together give you a product of -3 and a sum of 0? if you dont know, just tell me
February 2, 2015

Is it appropriate to use the "we" form and "I" in the same paper?
January 29, 2015

math
In a box there are 20 balls.7 of the balls are white. The first ball drawn from the box is white. What is the probability that the second ball will be white
January 8, 2015

Language Arts
i think its b
January 8, 2015

pacific rim
Mrs Garcia had 2/3 of a pumpkin pie left.Her sons at 3/8 of what was left. What fraction of the whole pie did her sons eat? 2/3*3/8=6/24
January 7, 2015

Math
Zach had to make bracelets for Student Council. He made 10 of them on Monday and 2/5 of them on Tuesday. Zach completed the remaining 1/2 on Wednesday. How many bracelets for Student Council did Zach have to make? Tuesday = 2/5 = 4/10 of the total. Wednesday = 1/2 X 3/5 = 3/10...
December 15, 2014

math
Work is incorrect. See details below. a) a+c=1850 and \$7.50a+\$4.50c=\$10,125. Substitute a=1850-c which gives 7.50(1850-c)+4.50c=10,125 13,875-7.50c+4.50c=10,125 3.00c=3,750 c=1,250 a=1,850-1,250=600 b) 10,125x16=\$162,000 c) F=full size football M=miniature football F+M=6,000 \$...
December 15, 2014

language arts
that website is good because it's organized the story.
December 15, 2014

Algebra
How do you sole the problem below? Kevin flies a plane against a headwind for 5600 miles. The return trip with the wind took 10 hours less time. If the wind speed is 5 mph, how fast does Kevin fly the plane when there is no wind?
December 14, 2014

Algebra
How long would it take for a ball dropped from the top of a 256-foot building to hit the ground?
December 10, 2014

ashworth
Asian emphasis on the value of filial piety may be note in ?
November 19, 2014

Math
Yes, it is I again, with yet another math problem. The question is; In a bag, there are 8 white marbles, 8 blue marbles, 7 red marbles, and 6 yellow marbles. How many marbles does it take to pull out 3 marbles of the same color. (A)6 (B)9 (C)12 (D)15 (E)I forgot the last one I...
November 16, 2014

Math
I am in 6th grade but to me, that doesn't matter because I have high hopes for myself. My question is; How many distinct letter arrangements can be made from the word LETTER with each T on each side? (A) 6 (B) 12 (C) 24 (D) 120 (E) 720 I think it is 24 because if an ...
November 15, 2014

Economics
Hamburgers supply and demand puzzle
November 15, 2014

Math
This question was confusing, but I came up along with help from Google calculator and an inverse trigonometric calculator, that (A) is around 4 degrees and (B) is around 15 meters (to the hundredth degree is 14.96).
November 15, 2014

Calculus
Find the equation of the line tangent to the function f(x)= square root of (x^3 + 4x) through the point (2,4)
November 14, 2014

Geometry
A square piece of cardboard, 24 inches by 24 inches, is to be made into an open box by cutting out each of the four corners. Each side of the box will then be folded up. Find the maximum volume that the box can hold.
November 13, 2014

math
the surface area cost of construction per m^2 for a large box is \$50 for the base, \$60 for the top and \$40 for the walls. Find the dimensions of this box that minimize the cost if its volume has to be 9m^3 and its height, 1m
November 12, 2014

what is the rate of change of the angle of eleva
An observer is 20 m above the ground floor of a large hotel atrium looking at a glass-enclosed elevator shaft that is 20 m horizontally from the observer (see figure). The angle of elevation of the elevator is the angle that the observer's line of sight makes with the ...
November 10, 2014

calculus
An observer is 20 m above the ground floor of a large hotel atrium looking at a glass-enclosed elevator shaft that is 20 m horizontally from the observer (see figure). The angle of elevation of the elevator is the angle that the observer's line of sight makes with the ...
November 9, 2014

Physics
the upward force is 16760N while your two downward forces are 1080N and 13832.1N that comes from gravity x mass. Subtract the two then divide by the mass of the submarine
October 23, 2014

physics
A car accelerates uniformly from rest to a speed of 73.6 mi/h in 7.68 s. How do i find the distance the car traveled during this time, in units of m
October 22, 2014

physics
A car accelerates uniformly from rest to a speed of 73.6 mi/h in 7.68 s. Find the constant acceleration of the car. Answer in units of m/s 2
October 21, 2014

tech math
how to solve one pulley is 7 cm larger in diameter than a second pulley. the larger pulley turns at 80 rpm, and the smaller pulley turns at 136 rpm. what is the diameter of each pulley
October 19, 2014

Calculus
That silly quotient rule! Thanks.
October 19, 2014

Calculus
Find f''(1/2) using f(x) = ln(1-x). f'(x) = 1/(1-x) * -1 = -1/(1-x) so then using quotient rule: f''(x) = ((-1*-1) - ((1-x)(0))) / (1-x)^2 f''(1/2) = 1/(1-(1/2))^(2) = 4 Is this correct?
October 19, 2014

Calculus
This is great, thank you!
October 19, 2014

Calculus
What is the derivative of (ln(x))^x ? I have: f(x) = ln(x)^x f(x) = xlnx f'(x) = x/x + 1 * ln(x) f'(x) = 1 + ln(x) Is this correct?
October 19, 2014

english
Identify Prepositional Phrases: Last summer our whole family hiked up a mountain.
October 18, 2014

Physics - Second Law Question
the space shuttle engines cause an upward force of 3 x 10 ^5 N to act on the shuttle. gravity pulls down on the shuttle with a force of 1.96 x 10^5 N. what is the net force on the shuttle? what is the direction of the net force?
October 15, 2014

Physics - Second Law Question
A large raindrop falling a cloud is acted on by a gravitational force of 4.9 x 10^-3 N directed downward and a force of air resistance of 4.5 x 10^-3 N directed upward. What is the net force on the raindrop? What is the direction of the net force? Thank you so much!
October 15, 2014

Chem Lab Help- Check Urgent
We had acid base and solid mixture in this experiment. other than these we aren't given anything else. Yes it was an extraction.
October 12, 2014

Chem Lab Help- Check Urgent
Separation of Unknown Compounds ( this is a lab question. we used ether in this experiment)
October 12, 2014

Chem Lab Help- Check Urgent
Suggest another solvent you might use instead of ether. Explain your choice giving the advantages and disadvantages of your choice. I said: Toluene Advantages are: -the vapor pressure of Toluene is less -the freezing point is much lower -low polarity -immiscible in water ...
October 12, 2014

A car is at rest on a horizontal road. What is the value of the frictional force? Explain your answer. A bison stands at rest on the horizontal ground. What is the value of the frictional force? Explain. The normal force always has a direction perpendicular to the surface that...
October 9, 2014

You are provided with 5 M solutions of sodium hydroxide and hydrochloric acid for use in this experiment (Separation). How you would have prepared these solutions. Thanks!
October 8, 2014

Chem Lab Help
You are provided with 5 M solutions of sodium hydroxide and hydrochloric acid for use in this experiment (Separation). How you would have prepared these solutions. Thanks!
October 8, 2014

Engineering Calc.
Water is leaking out of an inverted conical tank at a rate of 6700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 7.0 meters and the diameter at the top is 4.0 meters. If the water level is rising ...
October 7, 2014

Intro Physics - Newton's third rule
a piano mover raises a 1000 N piano at a constant speed using a very light rope in a frictionless pulley system. with what force is the mover pulling down on the rope? Show steps please! Thank you!
October 7, 2014

Chem Lab Help
Separation and purification A mixture of benzoic acid, benzaldehyde and butylamine. What kind of experiment should you design to obtain each of the three compounds in a pure state. Just need ideas in order to start this experimental design. Thanks!!!
October 6, 2014

Calculus
let F(x) = f(2x) and suppose that the derivative of F(x) = x^(2). Find the derivative of f(2x).
October 5, 2014

Calculus
Thanks!
October 5, 2014

Calculus
So here is the question: Find and equation of the tangent line to the graph: 4)f(x)=e^(2x) passing through the point (0,0) I find derivative being f'(x) =2e^(2x) Then m = f'(0) = 2 put into point slope formula: (y-y1)=m(x-x1) y-0 = 2(x-0) which comes out to y=2x 0=2x...
October 5, 2014

Calculus
I have y = sin^2(3^(x)) which I rewrite as y = (sin(3^(x)))^2 I got the derivative using the chain rule as the following y' = 3(sin(3^x))^2 (cos(3x)) (3^(x)(ln(3)) Can anyone confirm whether this is right/wrong? Thanks
October 5, 2014

statistics
The police department of a major city has found that the average height of their 1,250 officers is 71 inches (μ = 71 in.) with σ = 2.3 inches.
September 28, 2014

statistics
c. The top 10% of the officers in terms of height also make higher salaries than the shorter officers. How tall does an officer have to be to get in that top 10% group? (I.e. what is the height marking off the top 10 percent?)
September 28, 2014

Physics
An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm. Her experiment will require photo-electrons of maximum kinetic energy 2.0eV. what frequency of light should be used to illuminate the tungsten?
September 23, 2014

Physics
What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?
September 23, 2014

Physics
An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?
September 23, 2014

Physics
White dwarf stars have been observed with a surface temperature as hot as 200,000 o C. What is the wavelength of the maximum intensity produced by this star? help please don't know what to do
September 23, 2014

Math
Pay attention in class
September 21, 2014

science
YOU COULD HAVE INFORMED ME OF THAT AN HOUR EARLIER!
September 18, 2014

science
Wow, you make me stay here for nearly an hour to wait for you to answer a question. Thanks. By the way, don't say how you didn't know the answer, you could have informed me of that 50min earlier.
September 18, 2014

science
a student brings in a piece of moldy bread. which microscope would you use to view the mold? why?
September 18, 2014

science
a student brings in a piece of moldy bread. which microscope would you use to view the mold? why?
September 18, 2014

Physics
How many joules of energy per kilogram of rest mass are needed to bring a spacecraft from rest to a speed of 0.77c?
September 14, 2014

science
Ok not necessarily you but other tutors.
September 12, 2014

science
Ok but you could of said something instead of leaving me hanging waiting for you to answer.
September 12, 2014

science
what the heck ms.sue you literally skipped over my question. i've been next to my computer screen waiting for you to answer my question.
September 12, 2014

science
if the paramecium overheats, what could happen to the metabolism
September 12, 2014

Maths
The first one iswhat angle does a 3.8m ladder make with the ground, if it reaches 2.1m up the wall? The second one is A concreter uses a ramp to wheelbarrow in sand from the ground level to floor level inside a building under construction. Floor level is 75cm above ground ...
September 11, 2014

Computer
Each of the following is a typical feature of a fee-based internet back up service EXCEPT ______. backup to external hard drive universal access file feedback information delayed deletion
September 10, 2014

living enviromentn
graduated cylinder why numbers going up on one side and down on the other side
September 9, 2014

living environment
1) the prefix milli- means 1/1,000. how many times would you have to fill and empty a 10 ml graduated cylinder in order to fill a 1 liter soda bottle? i put 100 times. 2) what are eight examples of liquid products sold by volume
September 9, 2014

living environment
the small spaces which represent millimeters count 9 spaces. i'm not talking about the spaces which represent centimeters
September 9, 2014

living environment
how many small spaces are marked off within 1 centimeter i know 10mm= 1 cm but when i literally count the small spaces, there are nine of them
September 9, 2014

economics
Hello, I am currently busy writing an essay and run against a wall: If government decreases the corporate tax rate, what would be the short-run and long-run effect on the aggregate supply, aggregate demand and Long-run aggregate supply in terms of shifts. (AS-AD Model) Would ...
September 9, 2014

living enviroment
thank you so much
September 8, 2014

living enviroment
never leave the fire on the stop unattended wash your hands after dealing with bacteria or anything dirty if there is broken glass don't pick it up with your bare hands always wear cooking mittens while dealing with hot objects
September 8, 2014

living enviroment
write 8 ways you could apply science safety rules in your kitchen at home.
September 8, 2014

science/math (mean)
Find the mean Sample Value 1- 41.93 2- 12.55 3- 48.07 4- 90.81 5- 18.45 6- 55.81 I came up with 44.60 the online program "said close but check to see if yo made a round error" and at least three decimal places
September 7, 2014

chemistry
Show calculations for how you will prepare 250 mL of 0.1 M AgNO3 solution from solid AgNO3 and water Give the reagent amounts and units.
September 1, 2014

Chemistry
The piperazine content of an impure commercial material can be determined by precipitating and weighing the diacetate: (C2H4)2N2H2 + 2 CH3COOH → (C2H4)2N2H2(CH3COOH)2 In one experiment, 0.3126 gram of the sample was dissolved in 25 mL of acetone, and 1 mL of acetic acid...
August 23, 2014

Chemistry
A 8.5 L sample is collected at 45 degrees C. What will the volume be if the temperature is raised to 70 degrees C.
August 19, 2014

Resume Writing
How would I say that using a resume word?
July 14, 2014

Resume Writing
Hello. I am creating a resume. Under one of my bullet points, I want to say that I write inspirational blogs. How would I say that in the resume way?
July 14, 2014

Math
Thank you so much Ms.Sue! :D
July 11, 2014

Math
what is the sum of a profit 0f \$8000 and a loss of \$13000? I'm realy struggling and need URGENT Help! plz respond
July 11, 2014

Chemistry
A 56 g sample of peanut oil has a volume of 60.9 cm^3. Calculate the density of the peanut oil.
July 8, 2014

Algebra
Solve equation. -6e^8n+8 -3=-23
July 5, 2014

physics
A sound wave of frequency 1310 Hz., propagating through air at 0 degrees Celsius, has a pressure amplitude of 11.0 Pa. What is the maximum particle speed (in meters/second)?
June 25, 2014

pharmacy
the structural formula of a drug is included in this section of a drug monograph
June 23, 2014

english
I expect a friend to both honest and a loyal pereson
June 17, 2014

english
I want to either study or to work abroad after I graduate.
June 17, 2014

Physics
Explanation of twin paradox in regards to special relativity theory.
June 7, 2014

1. Pages:
2. <<Prev
3. 1
4. 2
5. 3
6. 4
7. 5
8. 6
9. 7
10. 8
11. 9
12. 10
13. 11
14. 12
15. 13
16. Next>>