Saturday

December 20, 2014

December 20, 2014

Total # Posts: 829

**Physics**

The windpipe of a whooping crane is about 1.27 m long. Assuming that the pipe is closed at one end, what is the fundamental frequency of this pipe? Answer in Hz and use 340 m/s for the speed of sound.
*December 1, 2014*

**algebra**

simplify the expression show your work 3x(4x^4-5x)
*November 22, 2014*

**accounting**

Starbucks-. Locate the company’s annual report as outlined previously. Find the company’s segment information; it should be in the “Notes to Consolidated Financial Statements” or other similarly named section. Look for the word “Segment” in a ...
*November 20, 2014*

**physics**

A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +1.2. What is the magnification when the convex side is used as a mirror, the object remaining the same distance from the mirror?
*November 6, 2014*

**physics**

A car weighing 1.0 x 10^4N is parked on a 34 degree slope. The brakes fail and the car starts to slide down the hill. Assume no friction. Show your work, and determine a) the acceleration of the car, and b) after it has moved 28.0 m, how fast is it moving?
*November 2, 2014*

**Math**

5 + y/6=8
*October 23, 2014*

**Algebra**

I'm not getting it. I've tried to re-read the notes but I'm still confused. Label each statement as "true" or "false". If "false" correct the underlined portion. 1) If *|n+9| <_4,* then n+9>_ 4 and n +9_<4 2) If y-x <5-x ...
*September 29, 2014*

**Chemistry**

15.0 mL of 0.30 M sodium phosphate solution reacts with 20.0 mL of 0.23M lead(II) nitrate solution. What mass of precipitate will form?
*September 28, 2014*

**Chemistry**

A 55.29-g sample of Ba(OH)2 is dissolved in enough water to make 1.20 L of solution. How many milliliters of this solution must be diluted with water in order to make 1.00 L of 0.100 M Ba(OH)2? (Ignore significant figures for this problem.)
*September 28, 2014*

**Chemistyr**

A 55.29-g sample of Ba(OH)2 is dissolved in enough water to make 1.20 L of solution. How many milliliters of this solution must be diluted with water in order to make 1.00 L of 0.100 M Ba(OH)2? (Ignore significant figures for this problem.)
*September 28, 2014*

**chemistry**

What volume of a 0.550 M solution of potassium hydroxide can be made with 18.3 g of potassium hydroxide? (Ignore significant figures for this problem.)
*September 28, 2014*

**Physics**

A motorcyclist traveling 35.0 m/s realizes suddenly that he is headed straight for the edge of the Grand Canyon 50.0 m away. He immediately begins to brake, decreasing his speed at a rate of 7.00 m/s^2. With what velocity will he fly off into the canyon?
*September 23, 2014*

**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*

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