Sunday
September 21, 2014

Posts by Andy


Total # Posts: 817

math
One cubic meter (1.00 m3) of aluminum has a mass of 2.70E+3kg, and 1.00m3 of silver has a mass of 1.05E+4kg. Find the radius of an aluminum sphere whose mass is the same as that of an silver sphere of radius 1.07cm.
September 7, 2014

chemistry
What type of chemical rxn is Na2SO4(aq) +Ba(NO3)2(aq) the product is BaSO4(s) + 2NaNO3(aq)?what is its net ionic equation?
September 3, 2014

Algebra
please help Solve the equation if possible -2|3y+7|+9=5
August 31, 2014

Algebra
Please help. What is the x intercept of y+4=-4(x-2) I've gotten like 2 different answers: -3 and 1.
August 24, 2014

history
damnon tyvm I think I found it... Idustrial Revolution
July 13, 2014

history
_______, or laying high taxes on imported goods, was one way the European government supported and aided its own economy during industrialization
July 13, 2014

physics
what is the heat required to convert 0.1 kg of melting ice into steam at 100 degree celcius
May 20, 2014

math
Sorry posted wrong thing. ____ ____
May 6, 2014

math
Math two/y=2 ___ ____
May 6, 2014

chemistry
What is the [CH3NH3+] of a solution which is 0.1003 M in CH3NH2 and 0.1204 M in CsOH? CH3NH2(aq) + H2O(l) « CH3NH3+(aq) + OH−(aq)
May 6, 2014

chemistry
What is the [C7H5O2−] in a solution which is 0.1283 M in HC7H5O2 and 0.1364 M in HBr? HC7H5O2(aq) + H2O(l) « C7H5O2−(aq) + H3O+(aq) Ka = 6.5000e-5
May 6, 2014

chemistry
What would Qc be if the volume of the container decreased by a factor of 1.774 for the following reaction? PH3(g) + BCl3(g) → PH3BCl3(s) KC = 534.8 at 353.0oC
May 6, 2014

chemistry
At 2273 K the equilibrium constant for the reaction 2 NO(g) « N2(g) + O2(g) KC = 2400 What would be the equilibrium concentration of N2 if the initial concentration of NO was 0.1778 M?
May 6, 2014

chemistry
At 674.5 K the equilibrium concentrations of N2, H2, and NH3 were 0.1614 M, 0.1128 M, and 0.005892 M, respectively. What is the equilibrium constant for the reaction below? 2 NH3(g) → N2(g) + 3 H2(g)
May 6, 2014

science
explain the Eutectic and Eutectoid reaction in cast irons
April 18, 2014

science
Identify and discuss the main safety legislation applicable to the installation, commissioning operating and maintaining the tube swaging machine.
April 12, 2014

Derivatives
G(t)=5200/(1+12e^(-.52t)) Find G'(t) I keeo getting (-32448e^(-.52t))/(1+12e^(-.52t))^2 Is this correct?
April 2, 2014

Phsyics
In a shipping yard, a crane operator attaches a cable to a 1130-kg shipping container and then uses the crane to lift the container vertically at a constant velocity for a distance of 30 m. Determine the amount of work done by each of the following. (a) the tension in the ...
March 26, 2014

science
what would happen to the impedance of a series circuit containing an inductor, capacitor and resistor if the supply frequency is varied from 0 to infinity Hz
March 25, 2014

Physics
D- Transverse
March 24, 2014

Chemistry
A mixture of NaCN and NaHSO4 consists of a total of 0.60 mol. When the mixture is dissolved in 1.0 L of water and comes to equilibrium the pH is found to be 9.7.
March 9, 2014

Math
A rocket is launched into the sky on a windy day. The rocket has a vertical velocity of 15 m/s. There is a strong wind blowing east to west at 35 m/s. How far from the start point is the rocket after 60 seconds?
February 27, 2014

MATH ALGEBRA
f(x)=6x^3+19x^2+8x-5 find all the zeros of the given function
February 26, 2014

Chemistry
For the reaction given, the value of the equilibrium of the constant at 400 K is 7.0. Br2(g)+ Cl2(g)=2BrCl(g) Does the: Reaction proceed to the left? Reaction proceed to the right? Partial pressure represent a system in an equation?
February 21, 2014

Limits
Let lim f(x) =16 as x->4 and lim g(x) =8 as x->4 Use the limit rules to find lim [cos(pi*f(x)/g(x))] as x->4
February 20, 2014

Math
Salmonella bacteria grows rapidly in a nice warm place. If just a few hundred were left on a cutting board when a chicken was cut up, and they get into the potato salad, the population begins compounding. Suppose the number present in the potato salad after x hours is given by...
February 13, 2014

government
Congress represents the larger public interest by (Points : 1)
February 9, 2014

physics
A car travels 3.0km due west and then 2.0km to the north. Find the magnitude and direction of the car’s resultant displacement?
February 3, 2014

physics
Two boys want to pull a car. One of them exerts a force of 200 N toward West. The other a force of 150 N toward south. What is the net force exerted on the car? (Assume friction to be negligible.)
February 3, 2014

geometry
if a 5-foot tall bush casts a 2-foot shadow how tall is a tree standing next to the bush that casts an 8-foot shadow at the same time?
January 7, 2014

chemistry
How many CO2 molecules are formed when 10 methanol molecules react?
December 11, 2013

physics(URGENT!!!!!)
8.01xers Can anybody help with the falling ruler. I submission left(
December 9, 2013

physics(URGENT!!!!!)
A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= ...
December 8, 2013

physics I'M STUCK PZL HELP
A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= ...
December 8, 2013

physics Classical Mechanics
Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 8 % of its mass in 280 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 140.0 s? (suppose that the rocket...
December 8, 2013

physics Classical Mechanics
Hi, guys! What's about doppler shift? Can u tell me formulas?
December 8, 2013

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

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

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