Friday

April 18, 2014

April 18, 2014

Total # Posts: 803

**science**

explain the Eutectic and Eutectoid reaction in cast irons

**science**

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

**Derivatives**

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

**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 cabl...

**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

**Physics**

D- Transverse

**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.

**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?

**MATH ALGEBRA**

f(x)=6x^3+19x^2+8x-5 find all the zeros of the given function

**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?

**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

**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...

**government**

Congress represents the larger public interest by (Points : 1)

**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?

**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.)

**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?

**chemistry**

How many CO2 molecules are formed when 10 methanol molecules react?

**physics(URGENT!!!!!)**

8.01xers Can anybody help with the falling ruler. I submission left(

**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= 10...

**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= 10...

**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...

**physics Classical Mechanics**

Hi, guys! What's about doppler shift? Can u tell me formulas?

**physics(URGENT!!!!!)**

Anonymous can u explain c onemore time?

**Physics Classical Mechanics**

@kumar can you explain a)

**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 H...

**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 ne...

**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

**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 (n...

**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 (n...

**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 thi...

**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 ?

**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

**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 rais...

**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.

**English**

thank you :)

**English**

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

**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 j...

**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.

**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 :)

**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 :)

**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. Exp...

**books **

Thank you please help me on my other posts please and thank you help will be appreciated

**books **

I could not please help pleaseeee :)

**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 a...

**books (A thankless experience)**

Thank you Ms. Sue

**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.

**books(short essay)**

Yes this is the short essay. Thanks so much

**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 no...

**Reading**

Thank you

**Reading**

It's from the Journey's text book.

**Reading**

Double Dutch 5th grade reading.

**Reading**

What was the order in which all the girls learned double dutch?

**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

**math**

Thanks for your help.

**math**

How would I show my work for this answers?

**math**

how do you write 3.08 as a fraction?

**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 Unitar...

**Math**

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

**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 chose...

**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?

**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...

**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?

**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.

**calculus (please help steve)**

ok, thanks!

**calculus (please help steve)**

But we are taking a double integral. This would be finding a volume.

**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.

**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.

**Calculus-HELP!!!**

wolfram alpha says (s^2+8)/(s^3+16s)

**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

**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.

**calculus**

ok, thanks

**calculus**

could you give me a bit help on how to proceed if I were to use a volume integral?

**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⌋?

**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 temperatur...

**Data Structures and Algorithms**

545

**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) su...

**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 ...

**physics**

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

**physics**

so we would solve to get 66.51?

**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) ?

**physics**

how did you get the volume of air that hits the shark per second?

**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?

**calculus (hint?)**

f(x) is a twice differentiable function such that f(2x)=f(x+5)+(x−5)^2 What is f''(x)?

**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?

**calculus**

I would still like help as to how I would proceed. That is why I still ask for the answer.

**calculus**

However, I am still confused as to how I would proceed.

**calculus**

so what is the answer to the question?

**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?

**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)?

**calculus (point me in the right direction please?)**

but how would you get f(5)?

**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)?

**calculus (point me in the right direction please?)**

thank you steve!

**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?

**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

**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?

**calculus**

oops! Thanks for the help

**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 bother...

**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?

**calculus**

Are you just going to assume that any problem I ask for help on is from "Brilliant"?

**calculus**

How do you know anyways?

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