Thursday
December 8, 2016

Posts by thomas

Total # Posts: 710

Calculus applications
6. The bending moment (M) along a beam is M = WLx/2 -Wx2/2 kNm where x is the distance of a beam length L from the left hand end. W is the weight per unit length. (a) Shear force is calculated as the differential of bending moment. Find an expression for shear force and ...
December 5, 2016

history knowledge
I just want to know this for fun because I saw it and one of my history books and want to learn about it. Why did Alexander the Greats empire fall?
December 3, 2016

Calculus applications
A steel factory wishes to make a cylindrical container, of thin metal, to hold 100cm³, using the least possible area of metal. If the outside surface is S cm² and the radius is r cm, show that S = 2?r² + 200r-1 and hence find the required radius and height for ...
November 24, 2016

Algebra
Please help!! x^2+y^2+6y+5=0 x^2+y^2-2x-8=0
November 17, 2016

Physics
A typical candy bar contains 300 kilo-calories of energy. if all the energy released by eating the candy bar could be used to do work in lifting a 1000 kg car, how high could it be lifted?
November 10, 2016

math
Tom used 5/8 yard of ribbon to tie weights on the tail of his kite. He cut the length of ribbon in equal pieces that were 1/12 yard long. How many pieces, each 1/12 yard long did Tom cut from the 5/8 yard ribbon?
October 28, 2016

Math
Three-dimensional tic-tac-toe can be played on three arrays of 3x3 lattice points. To win, three points in a line must be chosen. Examples of such lines are ABC, ADE, AFG, AHI, FHJ. How many different lines can be found?
October 21, 2016

Public speaking
B. Clapping
October 13, 2016

Public speaking
Nonverbal communication includes A.posture B.clapping C.eye contact D.all of the above
October 13, 2016

physics
which ball has more energy a 5 kg ball rolling at 4 m/s or a 6 kg ball rolling at 3 m/s?
October 7, 2016

math
i) P(X < 6200) P(Z < 6200-6300/400) P(Z < - 0.25) = 0.4013 The probably of sales being less than 6200L is 40.13% ii) Question is not complete, so I cannot answer it.
September 25, 2016

Math
Distance = Square Root ((x2-x1)^2 +(y2-y1)^2) Square Root ((2-(-1))^2 + (4-0)^2) Square Root ((2+1)^2 + (4)^2 Square Root ((3)^2 + 16) Square Root (9+16) Square Root (25) = 5
September 25, 2016

Math
All students in Peter's class have $1.05, consisting of nickels and/or dimes and/or quarters. Each student has a different combination of coins, and all possible combinations of coins are included. What is the probability that Peter is unable to give his friend Jenny ...
September 21, 2016

Math
All students in Peter's class have $1.05, consisting of nickels and/or dimes and/or quarters. Each student has a different combination of coins, and all possible combination of coins are included. What is the probability that Peter is unable to give his friend Jenny change...
September 21, 2016

Math 6th grade
$500 = 3 clients $22,000 = x clients 500x = 66,000 x = 132 Tony needs 132 new clients
September 20, 2016

Calculus
tan(θ) = y/x = 5/12 Find r r^2 = x^2 +y^2 = 12^2 + 5^2 = 144 + 25 r = Square Root (169) r = 13 sin(θ) = y/r = 5/13
August 28, 2016

U.S. Government and Politics
Which statement best describes the significance of the Magna Carta?
August 15, 2016

science
What is the molarity of a solution of sodium chloride which contains 0.5moles in 200cubic centimeters? #2.what volume of 1m solution of hcl will contain 10moles?
August 2, 2016

physics
a helium atom is in one of its single states.one of the electrons is in an p-state and the other a D-sate.the atom is placed in a magnetic field,B,of strengh 3 tesla. sketch a diagram showing the degenerated states and all permissible transition from D-state b)Determine by how...
April 27, 2016

Hamlet
How does Hamlet show his Heroism?
April 17, 2016

math
70/800 8.75%
March 17, 2016

math
70/800
March 17, 2016

math
in an experiment, it was found that 70 out of 800 animals were happy in their surroundings. a find probability that an individual animal is happy in their surroundings. b. represent as a percent
March 17, 2016

math
second half is if both marbles are green
March 17, 2016

math
a box contains seven red marbles, five green marbles & eight blue marble. a marble is drawn at random & is replaced. a second marble is then draw from the jar. find the probabilty that both marbles are green
March 17, 2016

math
no
March 17, 2016

math
4 red marbles, 3 green, 2 yellow. you pick 2 at random.What is probability of a. 1 yellow & 1 red b. 2 green
March 17, 2016

math
a box contains seven red marbles, five green marbles & eight blue marble. a marble is drawn at random & is replaced. a second marble is then drawn from ther jar. find the probabilty that the first marble is red & second is green
March 17, 2016

Descriptive Physics
You are standing 5 feet from one speaker and 14 feet from another. Both speakers are producing the same sound. If the combined sound from both speakers is especially loud at your location, which of the following could be the wavelength of the sound? Choose all that apply. 1 ...
March 13, 2016

math
I am a number less than 3,000.When you divide me by 32, my remainder is 30. When you divide me by 58, my remainder is 44. What number am I.
January 13, 2016

physics
Pure helium is closed into cylinder with a movable piston. The initial volume, pressure, and temperature of the gas are 15 dm3, 2·105 Pa, and 300 K, respectively. If volume is decreased to 12 dm3 and the pressure increase to 3.5·105 Pa find the final temperature of ...
January 11, 2016

physics
A police car siren emits a sound wave with a frequency fs = 400 Hz and it is moving toward the wall at 25 /m/s. What frequency reflected from the wall does the driver of the police car hear ? The speed of sound is 340 m/s.
January 11, 2016

math
Dee used 2 1/3 cups of sugar for a cake recipe.If the amount of sugar the container holds is 3 times the amount she used,does the container hold more than,less than,or equal to 3 cups of sugar
December 3, 2015

math
Derek ran 3/8 of a race he had to stop for a break.If the race is 6 miles long,did Derek run more than,less than,or equal to 6 miles before he took a break?
December 3, 2015

math
Maresol spent 4/5 of her allowance on a pair of jeans.If she received $15 for allowance,did Maresol spend more than,less than,or equal to $15 on the jeans?
December 3, 2015

Physics
A ball with a mass of 4 kg and a velocity of 10 m/s strikes an 8kg ball that is initially at rest. If the collision is perfectly elastic, what are the velocities of the 4 kg and 8 kg ball after the collision?
December 2, 2015

math 5 grade
1: it is saying, six people are sleeping, to find total it is 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2. and your answer came out to be 51. TRUE :) 2: 6 1/2 * 1 1/2 is 13/2 * 3/2 which is 39/4! this is really 9 3/4 WHICH IS NOT 10! Oliva is wrong! hahaha! so that is your ...
December 2, 2015

math
maresol spent 4/5 of her allowance on a pair of jeans.if she received $15 for allowance,did maresol spend more than,less than,or equal to 3 cups of sugars?explain
December 2, 2015

Chemestry
2Fe + 3O2 --> 2Fe2O3
December 2, 2015

Biology: Genetics
that's true, also nucleotides affect DNA in deciding what it codes for; therefore it is affecting structure in general.
December 2, 2015

Math
A train leaves San Diego at 1:00 PM. A second train leaves the same city in the same direction at 4:00 PM. The second train travels 78 mph faster than the first. If the second train overtakes the first at 6:00 PM, what is the speed of each of the two trains?
December 2, 2015

Vani school
1 whole pizza, also quick grammar lesson, of each pizza* <3
December 2, 2015

Geometry
6/30 proportion of his height to where he is standing x/45 what we don't know and the distance of the flag pole 6/30=1/5 simplifying x/45 1/5=x/45 setting them equal x=9 if we sole we will get this For further help/ understanding draw the picture and see how these ...
December 1, 2015

Language arts
what about the Essay??
December 1, 2015

Algebra
a farmer fences off a small.rectangular plot of land thay is 60 feet by 100 feet. within that area, a garden is planted and surrounded by a walkway of uniform width. how wide is the walkway if the area of the planted area is one half of the area of the plot?
December 1, 2015

math
How can x-8 be modeled by being described as a situation? Answer:8x
November 11, 2015

Finance
Problem 10-32 Project Evaluation [LO1] Aria Acoustics, Inc. (AAI), projects unit sales for a new seven-octave voice emulation implant as follows: Year Unit Sales 1 86,000 2 99,000 3 113,000 4 108,000 5 89,000 Production of the implants will require $1,650,000 in net working ...
November 7, 2015

U.S. History (Check)
good job
October 13, 2015

Math
A bag contains 5 red, 7 yellow, 8 green, and 3 blue markers. What is the p(two green markers) will be chosen if the markers are not replaced as they are chosen?
September 1, 2015

calculus
A snowball is melting at the rate of 2 inches per hour. How fast is the surface area of the snowball changing at the instant the snowball has a radius of 3 inches i tried (d/dt) = 4pir^2 (dr/dt) its multiple choice and -72pi isnt there so im just trying to figure this out
August 28, 2015

Physics
Which one of the following actions would make the maxima in the interference pattern from a grating move closer together? A.Increasing the distance to the screen. B.Increasing the number of lines per length. C.Decreasing the number of lines per length. D.Decreasing the ...
August 11, 2015

BUSINESS STUDIES
Q1.With the aid of a diagram discuss the marketing systems Q2.Discuss the problems that occur when universities and industry form joint ventures for research purposes.How have these problems been solved?
July 8, 2015

probability
E[T]=9
May 16, 2015

chemistry
under what conditions could the decomposition of Ag2O(s) into Ag(s) and O2(g) proceed spontaneously at 298 K? 2Ag2O(s)---->4Ag(s)+O2(g) dG=22.42 Kj answer= 0.000118 atm.
May 9, 2015

chemistry
dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction to 0. H2(g)+I2(g)----&...
May 9, 2015

college chemistry
at its melting point, O c, the enthalpy of fusion of water is 1.435 kcal/mol. what is the molar entropy change for the melting ice at 0C? answer: 5.26 cal/mol-k
May 9, 2015

college chemistry
thanks
May 9, 2015

college chemistry
for the reaction at 298 K 2A+b ---->C enthalpy=100 K/cal entropy= 0.050 kcal/k assuming enthalpy and entropy to be constant over the temperature range, at what temperature will the reaction become spontaneous? answer: T>2000K
May 9, 2015

college chemistry
im confused i found those as the standard enthalpies and entropies for pcl3? i cant get answer
May 9, 2015

college chemistry
is it 306.4/33.2?
May 9, 2015

college chemistry
what is dHvap?
May 9, 2015

college chemistry
estimate the normal boiling point of Pcl3 answer: 333 K how do you get it?
May 9, 2015

LA
I need help too
May 7, 2015

Chemistry
Check my work & answer please. I need to make sure I am able to do this type of problem correctly. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity ...
April 19, 2015

Chemistry
4. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity of 8.37 J/g-oC, density of 1.038 g/mL). In maintaining a constant engine temperature, the ...
April 18, 2015

Physics
A 1100- kg car collides with a 1400- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 25 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...
April 16, 2015

Earth Science
You doing this? pkwy.k12.mo.us/homepage/skang/file/Astronomy%20Review.pdf From here the answer would be C - Full moon.
April 9, 2015

Math
Volume of cube = 1ml How many ml in 1.5L?
April 9, 2015

science
Compare today's temperature of the universe to the temperature of the universe right after the big bang. That will give you your answer.
April 9, 2015

science
The average temperature of the universe today is approximately 2.73 kelvins (−270.42 °C; −454.76 °F), based on measurements of cosmic microwave background radiation. What was it like back then?
April 9, 2015

science
I'm sorry but please reread the article. We even quoted the answers for you but you don't want to put any effort into reading them and trying to figure out what the quotes are saying. You want the answer to be handed you.
April 9, 2015

science
Thank you Ms. Sue
April 9, 2015

science
2 - 3 paragraphs down it says... "For the first 380,000 years or so, the universe was essentially too hot for light to shine, according to France's National Center of Space Research " Miss that too?
April 9, 2015

science
You obvously didn't read it. The very first sentence in that post the Ms. Sue posted is "The universe was born with the Big Bang as an unimaginably hot, dense point." ... how did you miss that??
April 9, 2015

math
As Ms. Sue mentioned you posting under many names today. Instead of asking questions, why not try to help others or even at least do some work on your questions instead of guessing. I don't mean to be rude here.
April 9, 2015

math
Wrong. Its B The office building is designed with n floors and each floor is 3.9m right so you have right now: 3.9n On top of entire office building is a antenna which is 15.85m tall so its 3.9n + 15.85 = h
April 9, 2015

Math
Yes, your answer is A as mentioned by Steve
April 9, 2015

Calculus
Thank you so much!
April 9, 2015

Calculus
Suppose that y=f(x) = sqrt(2x), x>=0 Find a c > 0 such that the tangent line to the curve y = f(x) at x = c has the same slope as the tangent line to the curve y = f^–1(x) at x = c. You get: c = 1/8 c = 1/2 c = (1/8)^(1/3) c = (1/3)^(2/3) c = (1/2)^(1/3)
April 9, 2015

math
coin = 1/2 Cube has number 1, 2, 3, 4, 5, and 6 so 2, 4, 6 are even numbers which is 1/2 of the cube So 1/2*1/2 = 1/4
April 9, 2015

Calc AB
Thank you. I was taking the inverse of (x+3)^3 + 2 and then I got stuck after that.
April 9, 2015

Calc AB
Let f(x) = (x+3)^3 + 2. The graph of the inverse function y = f^–1(x) has a vertical tangent at: (Hint: Think about the symmetry of the 2 graphs.) (66, 1) (2, –3) (10, –1) (–3, 2) (–1, 10)
April 9, 2015

Math
Got this one. Its 1/24 correct?
April 9, 2015

Math
Suppose f(x) = 4x^5-(1/x^4) Find the slope of the tangent line to the graph of y = f^–1(x) at (3, 1). You get: 1/24 1/16 00062 1620 972
April 9, 2015

Calc AB
Are you possibly Steve Hawkins? Your getting this one after another.
April 9, 2015

Calc AB
Suppose that f(x) is an invertible function (that is, has an inverse function), and that the slope of the tangent line to the curve y = f(x) at the point (2, –4) is –0.2. Then: (Points : 1) A) The slope of the tangent line to the curve y = f –1(x) at the point...
April 9, 2015

Math
It was B
April 9, 2015

Math
B??
April 9, 2015

Math
derivative: sin(pi*cosx) = -pi sin(x) cos(pi cos(x))
April 9, 2015

Math
Inverse of sin(pi*cosx) = cos^(-1)((sin^(-1)(x))/pi) Derivative of cos^(-1)((sin^(-1)(x))/pi) is -1/(sqrt(1-x^2) sqrt(pi^2-sin^(-1)(x)^2))
April 9, 2015

Math
Suppose f(x) = sin(pi*cosx) On any interval where the inverse function y = f –1(x) exists, the derivative of f –1(x) with respect to x is: a)-1/(cos(pi*cosx)), where x and y are related by the equation (satisfy the equation) x=sin(pi*cosy) b)-1/(pi*sinx*(cos(pi*cosx...
April 9, 2015

Calc AB
c)(1/2)x^(-1/2) is the correct answer
April 9, 2015

Calc AB
Wait f^-1(x) is 2sqrt(x) so then the derivative of that is 1/sqrt(x)
April 9, 2015

Calc AB
That would be 1/(dy/dx) of x^2-4x+4 which would be 1/2x-4 correct?
April 9, 2015

Calc AB
Suppose that y = f(x) = x^2-4x+4 Then on any interval where the inverse function y = f^–1(x) exists, the derivative of y = f^–1(x) with respect to x is: a) 1/(2x-4) b) 1/(2y-4), where x and y satisfy the equation y=x^2-4x+4 c)(1/2)x^(-1/2) d)(1/2)x^(1/2) e) Both 1/(...
April 9, 2015

Calculus AB
Yep I was correct
April 9, 2015

Calculus AB
well lets see. Since f^-1(x) = 9-x^2 then the derivative of 9-x^2 is -2x correct?
April 9, 2015

Calculus AB
For the function f(x) = sqrt(9-x), which is equal to d/dx(f-1( -1 is the inverse)(x)) a) -2x b) sqrt(x) + 9 c) x^2 + 9 d) 2x e) 9-x^2
April 9, 2015

Calculus
Answer is 1/(2y-4) where x and y are related by the equation (satisfy the equation) x=y^2-4y+5 x>= 1
April 9, 2015

Calculus
inverse of x^2 - 4x +5 is 2±sqrt(x-1) and the derivative of that is (2x-4) but I don't know how to get the x>= 1 or x>= 2
April 9, 2015

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