Thursday
May 26, 2016

Posts by andy

Total # Posts: 890

physics(URGENT!!!!!)
Anonymous can u explain c onemore time?
December 8, 2013

Physics Classical Mechanics
@kumar can you explain a)
December 8, 2013

Chemistry
What is the lattice energy of NaI? Use the given information below. Heat of formation for NaI = -288.0 kJ/mol Heat of sublimation for Na = 107.3 kJ/mol Ionization energy for Na = 496.0 kJ/mol Bond dissociation energy for I2 = 149 kJ/mol Electron affinity of I = -295.0 kJ/mol ...
November 22, 2013

Science
1.- B 2.- D 3.- C 4.- C
November 15, 2013

Chemistry
Heisenberg's uncertainty principle can be expressed mathematically as Δx*Δp = h/4π, where Δx and Δp denote the uncertainty in position and momentum respectively and h is Planck's constant. What would be the uncertaintry in the position of a ...
November 10, 2013

Chemistry
What is the mass of a fly in grams if its de Broglie wavelength is 1.545e-31 m when it is traveling at a velocity of 3.605 m/s
November 10, 2013

Chemistry
Hydrogen exhibits several series of line spectra in different spectral regions. For example the Lyman series (nf = 1 in Balmer-Rydberg equation) occurs in the ultraviolet region while the Balmer (nf = 2) series occurs in the visible range and the Paschen (nf = 3), Brackett (...
November 10, 2013

Chemistry
Hydrogen exhibits several series of line spectra in different spectral regions. For example the Lyman series (nf = 1 in Balmer-Rydberg equation) occurs in the ultraviolet region while the Balmer (nf = 2) series occurs in the visible range and the Paschen (nf = 3), Brackett (...
November 10, 2013

Physics
elbow raises a 1200 N piano a distance of 5 meters using a set of pulleys. elbow pulls in 20.0 meter of rope while exerting a force of 340 N. a) what is the work output? b) what is work input c) what is the mechanical advantage of this machine? d) what is the efficiency of ...
November 3, 2013

physics
mass of passenger is 90 kg and mass of scale is 40 kg what is scale reading inside an elevator moving at 7.8 m/s2 upward? does the mass of the scale affect the scale reading ?
November 3, 2013

Geomentry
prove the statement Angle ABD is a right angle and Angle CBE is a Right Angle and prove Angle ABC is Congruent to Angle DBE
October 27, 2013

Chemistry
The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179 x 10-18/n2 J where n is the principal quantum number for the energy level. What is the frequency in Hz of the electromagnetic radiation absorbed when an electron is ...
October 21, 2013

Chemistry
What volume of a liquid having a density of 4.55 g/cm3 is needed to supply 10.47 grams of that liquid? Answer in cm3.
October 12, 2013

English
thank you :)
September 29, 2013

English
Don't know how to recognize it but i know what it means. It is something that is ironic or sarcastic. Right?
September 29, 2013

English
really need help on this question it is worth 5 marks. The question is: Explain how "A Thankless Experience" is a satire with support with direct reference to the essay. The short essay is called A Thankless Experience by Stephen Lautens' it is on the internet ...
September 29, 2013

A Thankless Experience
I did study these but can't seem to start on a sentence. I dont know what sentences from the essay are satire. If i could get started on one i might be able to understand.
September 28, 2013

A Thankless Experience
I really need help on this question it is worth 5 marks. The question is: Explain how "A Thankless Experience" is a satire with support with direct reference to the essay. The short essay is called A Thankless Experience by Stephen Lautens' Thank you :)
September 28, 2013

English
Story: A Thankless Experience Author: Stephen Lautens Question: Describe the diction that Lautens uses in "A Thankless Experience"? Describe Lautens tone in "A Thankless Experience"? Help will be appreciated :)
September 25, 2013

english A Thankless Experience Questions
Abstract words present qualities or ideas that cannot be felt by the senses. They are often general words, as opposed to concrete words which express something more tangible. Truth, honor and happiness are all abstract words, while aroma, stone and fire are concrete words. ...
September 25, 2013

books
Thank you please help me on my other posts please and thank you help will be appreciated
September 25, 2013

books
I could not please help pleaseeee :)
September 25, 2013

books "A Thankless Experience" Short Essay Help
This is the story: A Thankless Experience by Stephen Lautens. The story is on the internet. jiskha does not allow me to post the url The question is: Provide two examples of figurative language used by Lautens in his essay and describe the effect of each example. Please help ...
September 25, 2013

books (A thankless experience)
Thank you Ms. Sue
September 24, 2013

books (A thankless experience)
Explain whether Lautens' essay is written formally or informally, referring to examples from the essay for support. The short essay is on the internet called A thankless experience by Stephen Lautens. I can not post the url because jiskha does not allow it.
September 24, 2013

books(short essay)
Yes this is the short essay. Thanks so much
September 24, 2013

books(short essay)
Describe the sentence structure Stephen Lautens uses in "A Thankless Experience". Support your view with examples from the essay. This is the story: A Thankless experience by Stephen Lautens this story is on the internet I was about to post the url but jiskha does ...
September 24, 2013

Reading
Thank you
September 16, 2013

Reading
It's from the Journey's text book.
September 16, 2013

Reading
Double Dutch 5th grade reading.
September 16, 2013

Reading
What was the order in which all the girls learned double dutch?
September 16, 2013

Chemistry
A sheet of aluminum (Al) foil has a total area of 2.119 ft2 and a mass of 2.714 g. What is the thickness of the foil in millimeters? (Density of Al = 2.699 g/cm3? I got 5.108*10^-4 cm but that is wrong. (2.714g)/(2.699g/cm^3)/(2.119ft^2) * 1ft/30.48cm = 5.108*10^-4 cm
September 15, 2013

math
Thanks for your help.
September 11, 2013

math
How would I show my work for this answers?
September 11, 2013

math
how do you write 3.08 as a fraction?
September 11, 2013

econmics
Suppose the price of widgets rises from $7 to $9 and consumption of widgets falls from 25 widgets a month to 15 widgets. Calculate your price elasticity of demand of widgets. What can you say about your price elasticity of demand of widgets? Is it Elastic, Inelastic, or ...
September 10, 2013

Math
How do you know if a steam and leaf display is uniform, unimodal or bimodal?
September 5, 2013

Math
One advantage of a _____________ is that the actual data values are retained in the graphical display of the data. A) Pie chart B) Dot plot (This one?) C) Histogram D) boxplot If we want to discuss any gaps and clusters in a data set, which of the following should not be ...
September 5, 2013

Geometry
The length of one side of an isosceles triangle is two times the base b. This length is equal to (8b - 12),in. What is the value of b?
September 4, 2013

Math
A two-player game is played with two piles of stones, with sizes m,n. On a player's turn, that player can remove any positive integer number of stones from one pile, or the same positive integer number of stones from each pile. A player loses when they are unable to take a...
August 12, 2013

Math (Combinatorics)
How many ways to rearrange 9 a's, 2 b's, and 2c's so that we never see bc and both b's always appear before both c's?
July 30, 2013

calculus (please help steve)
Evaluate ∬(x^2+y^2)^2/(x^2y^2) dx dy over the region common to the circles x^2+y^2=7x and x^2+y^2=11y.
July 26, 2013

calculus (please help steve)
ok, thanks!
July 25, 2013

calculus (please help steve)
But we are taking a double integral. This would be finding a volume.
July 25, 2013

calculus (please help steve)
Evaluate ∬(x^2+y^2)^2/(x^2y^2) dx dy over the region common to the circles x^2+y^2=7x and x^2+y^2=11y.
July 25, 2013

calculus
Evaluate ∬(x^2+y^2)^2/(x^2y^2) dx dy over the region common to the circles x^2+y^2=7x and x^2+y^2=11y.
July 25, 2013

Calculus-HELP!!!
wolfram alpha says (s^2+8)/(s^3+16s)
July 25, 2013

calculus
valuate ∬(x^2+y^2)^2/(x^2y^2) dx dy over the region common to the circles x^2+y62=7x and x^2+y^2=11y
July 25, 2013

calculus
Evaluate ∬R 1/sqrt(x^2+y^2) dx dy, where R is the region bounded by y≥0 and x^2−x+y^2≤0.
July 25, 2013

calculus
ok, thanks
July 25, 2013

calculus
could you give me a bit help on how to proceed if I were to use a volume integral?
July 25, 2013

calculus
Let V be the volume of the region bounded by x^2+y^2≥z^2, z≥0 and x^2+y^2+z^2≤1. What is the value of ⌊100V⌋?
July 25, 2013

physics
What is the wind speed in m/s required to keep a great white shark suspended in midair during a summer day on the California beach? Details and assumptions Model the shark as a horizontal cylinder 6 m long and 1 m in diameter. The air is at a pressure of 1 atm and a ...
July 24, 2013

Data Structures and Algorithms
545
July 24, 2013

math
Let S be the set of {(1,1), (1,−1), (−1,1), (1,0), (0,1)}-lattice paths which begin at (1,1), do not use the same vertex twice, and never touch either the x-axis or the y-axis. Let Sx,y be the set of paths in S which end at (x,y).For how many ordered pairs (x,y) ...
July 23, 2013

math
A token is placed on the leftmost square in a strip of four squares. You are allowed to move the token left or right along the strip by sliding it a single square, provided that the token stays on the strip. How many ways can the token be moved such that after 15 moves, it is ...
July 23, 2013

physics
integral (1+cos 2T) dT = T + sinTcosT so (2/Pi)v integral (1+cos 2T) dT from 0 to pi/2 = 1 ?
July 23, 2013

physics
so we would solve to get 66.51?
July 23, 2013

physics
so how would we apply this 3v/2 into your original equation rho * 2 r L v^2 = 1000(9.8)(pi r^2)(L) ?
July 23, 2013

physics
how did you get the volume of air that hits the shark per second?
July 23, 2013

physics (fluids)
If a object of radius 3 cm is attached to the ground in a 3 m deep sea, what is the vertical force in N with which the water (density = 1000 kg/m^3) presses on it?
July 22, 2013

calculus (hint?)
f(x) is a twice differentiable function such that f(2x)=f(x+5)+(x−5)^2 What is f''(x)?
July 21, 2013

calculus
If f(x)=∫ (from -x to x) cos(t)/(1+e^t) dt and x=asin(77/85), then the absolute value of f′(x)−f(x) can be expressed as a/b, where a and b are coprime positive integers. What is the value of a+b?
July 20, 2013

calculus
I would still like help as to how I would proceed. That is why I still ask for the answer.
July 20, 2013

calculus
However, I am still confused as to how I would proceed.
July 20, 2013

calculus
so what is the answer to the question?
July 20, 2013

calculus
If f(x)=∫ (from -x to x) cos(t)/(1+e^t) dt and x=asin(77/85), then the absolute value of f′(x)−f(x) can be expressed as a/b, where a and b are coprime positive integers. What is the value of a, and what is the value of b?
July 20, 2013

calculus
f(x) and f′(x) are continuous, differentiable functions that satisfy f(x)=x^3+4x^2+∫ (from 0 to x)(x−t)f′(t) dt. What is f′(5)−f(5)?
July 20, 2013

calculus (point me in the right direction please?)
but how would you get f(5)?
July 19, 2013

calculus (point me in the right direction please?)
f(x) and f′(x) are continuous, differentiable functions that satisfy f(x)=x^3+4x^2+∫(from 0 to x)(x−t)f′(t) dt. What is f′(5)−f(5)?
July 19, 2013

calculus (point me in the right direction please?)
thank you steve!
July 18, 2013

calculus (point me in the right direction please?)
Let V be the volume of the three-dimensional structure bounded by the region 0≤z≤1−x^2−y^2. If V=a/bπ, where a and b are positive coprime integers, what is a+b?
July 18, 2013

physics
114 mm Hg = 15198.75 pascals 16.0 cm^2 = 0.0016 m^2 P=F/A 15198.75=F/0.0016 F=24.318 newtons
July 18, 2013

calculus
he volume of the solid obtained by rotating the region bounded by x=(y−2)^2 and y=x about the x-axis has the form N/2π. What is the value of N?
July 18, 2013

calculus
oops! Thanks for the help
July 18, 2013

calculus
alright, so i got that f'(x)=4x^3-76x^2+4ax =4x(x^2-19x+4a) since this must never equal 0, it must have no solutions. Therefore, x must not be 0 and x^2-19x+4a must not be 0. For that to occur, 289-16a<0, so a > 18.0625. Can you please check me work? Sorry for ...
July 18, 2013

calculus
How many positive integers a (<1000) are there such that the function f(x)=x^4−76/3x^3+2ax^2 has no local maxima?
July 18, 2013

calculus
Are you just going to assume that any problem I ask for help on is from "Brilliant"?
July 18, 2013

calculus
How do you know anyways?
July 18, 2013

calculus (could you help point me in the right direction?)
could someone please point me in the right direction?
July 18, 2013

calculus
Let V be the volume of the three-dimensional structure bounded by the region 0≤z≤1−x^2−y^2. If V=a/bπ, where a and b are positive coprime integers, what is a+b?
July 18, 2013

math
If (x+2)f(2−x)+(2x+1)f(2+x)=1 for all real values of x, then f(18)=a/b, where a and b are coprime positive integers. What is the value of a+b?
July 18, 2013

calculus
How many integer values of a are there such that f(x)=x^+ax^2+8ax+25 has no local extrema?
July 18, 2013

calculus
A 3-dimensional structure is obtained from rotating the parabola y=x^2 about the y-axis. Each second, 2π units^3 of water is being poured into the structure from the top. When 8π units^3 of water has been poured in the structure, the instantaneous change in water ...
July 18, 2013

calculus
no, i think that ∫[0,2] π((4y)^2-(2y^2)^2) dy is 256/15π
July 18, 2013

calculus
i believe its bounded from y=0 to y=2
July 18, 2013

calculus
The area bounded by the curve 2y^2=x and the line 4y=x is rotated around the y-axis. The volume of the resulting structure can be expressed as V=a/bπ, where a and b are coprime positive integers. What is the value of a+b?
July 18, 2013

calculus
The area bounded by the curve 2y^2=x and the line 4y=x is rotated around the y-axis. The volume of the resulting structure can be expressed as V=a/bπ, where a and b are coprime positive integers. What is the value of a+b?
July 17, 2013

calculus
A 3-dimensional structure is obtained from rotating the parabola y=x^2 about the y-axis. Each second, 2π units^3 of water is being poured into the structure from the top. When 8π units^3 of water has been poured in the structure, the instantaneous change in water ...
July 17, 2013

math calculus
The volume of the solid obtained by rotating the region bounded by y=x^2−2x and y=x about the line y=9, has the form a/bπ, where a and b are positive coprime integers. What is the value of a+b?
July 17, 2013

physics
no its wrong!
July 17, 2013

physics
A clock is made out of a disk of radius R=10 cm which is hung by a point on its edge and oscillates. All of a sudden, a circular part right next to the hanging point of radius R/2 falls off, but the clock continues oscillating. What is the absolute value of the difference in s...
July 17, 2013

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...
July 17, 2013

math (please help steve)
Brilli the ant randomly placed a token into a square on a 2×100 chessboard according to a probability distribution P. The token is then moved uniformly at random to one of the horizontally, vertically, or diagonally adjacent squares. The probability that the token is in ...
July 17, 2013

math
Brilli the ant is considering the complexities of a 5-dimensional universe. She wants to count the number of integer points that are distance sqrt(n) away from the origin. Let Tn be the set of ordered 5-tuples of integers (a1,a2,a3,a4,a5) such that a1^2+a2^2+a3^2+a4^2+a5^2=n....
July 17, 2013

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...
July 17, 2013

Maths
f(x)is a function differentiable at x=1 and f'(1)=1/8. what is the value of f(x)-f(1) f'(x) denotes the derivative of f(x)
May 24, 2013

Math
I mean 4 cups not 2 cups
May 23, 2013

Math
No because he has 2 cups. It doesn't equal a gallon. 1 gallon = 16 cups.
May 23, 2013

math
So far they have $5000 in their fund. Timmy gave $450. Donna gave $900. How much did Kathy give? A. $4550 B. $4100 C. $3700 D. $365
May 23, 2013

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