# Posts by Joe

Total # Posts: 2,600

**chemistry**

The addition of a dilute hydrobromic acid would clearly distinguish solutions of a. barium nitrate and sodium sulfate b. lead nitrate and silver nitrate c. mercury(I) nitrate and silver nitrate d. silver nitrate and calcium sulfate e. calcium nitrate and barium nitrate

*December 18, 2009*

**AP Physics B (Heat Engines)**

I know that efficiency is e = |W|/|QH| were the H is the subscript I know that 900 MW is a value of power which is not work I know that |QH| is 2.8 E8 J/kg but I do not like the units for this, J/kg, as I thought Q was measured in joules only... How do I find the work done?

*December 16, 2009*

**AP Physics B (Heat Engines)**

18. (II) At a steam power plant, steam engines work in pairs, the heat output of the first one being the approximate ehat input of the second. Th eoperating temeprautres of the first are 680 degrees C and 430 degrees C, and of the second 415 degrees C and 280 degrees C. If the...

*December 16, 2009*

**pre al**

how do you find surface area

*December 15, 2009*

**SCIENCE**

What is the movement of a water particle in a wave called?

*December 14, 2009*

**science**

The movement of a water particle in a wave is called what?

*December 14, 2009*

**physics**

An aluminum cylinder weighs 1.03 N. When this same cylinder is completely submerged in alcohol, the volume of the displaced alcohol is 3.90 x 10-5 m3. If the cylinder is suspended from a scale while submerged in the alcohol, the scale reading is 0.730 N. What is the specific ...

*December 13, 2009*

**History**

Why do we need taxes? Could someone tell me in two paragraphs besides that we need it for roads and schools

*December 12, 2009*

**college**

what strategies can be incorporate into effective visual element into business presentations

*December 11, 2009*

**algebra 1**

Use the point-slope form to write an equation of the line with the given slope and point. m = 4, passes through (4, 6)

*December 10, 2009*

**PreCalc**

please h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 4 8 7 4 9 0

*December 10, 2009*

**Pre Calc**

I do not see why I got two different equations for my answer A weight attached to the end of along spring is bounicng up and down. As it bounces, its distance from the floor varies sinusoidally with time. You start a stopwatch. When the stopwatch reads 0.3 s, the weight first ...

*December 10, 2009*

**biology**

what functional groups appear in CH3CH2CH2Br

*December 10, 2009*

**algebra**

3[5-(2x+1(2))]= 3[5-(2x+2)] 3[5-2x-2]= 3[3-2x]= 9-6x

*December 10, 2009*

**spanish**

what is the correct possessive adjective for ¿Es mi clase de español?

*December 9, 2009*

**english**

Did you like “Usher”? How successful was Poe’s use of Gothic devices in creating an atmosphere of dread?

*December 7, 2009*

**Calc 3**

The actual span of the base of the dome is 143 feet. 1) Use cylindrical coordinates to write the surface of the dome as a function of the distance from the center of the base; that is find z = f (r) . 2) Use your function to find the height of the dome; that is what is f (0...

*December 7, 2009*

**Pre Calc**

Naturalists findthat the populations of some kinds of predatory animals vary periodically. Assume that the population of foxes in a certain forext vareis sinusoidally iwth time. REcord started being kept when time t = 0 years. A minimum number, 200 foxes, occurred when t = 2.9...

*December 6, 2009*

**PreCalc**

never mind

*December 6, 2009*

**PreCalc**

so what is the equation of the line??? h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 1 4 7 1 4 4 I understood this y = 120 + 8sin((pi)/35 - (5pi)/4)=120 were do i go from here THANKS!!!

*December 6, 2009*

**Math**

What does this notation mean =^-1 equal sign raised to negative one power

*December 6, 2009*

**TOBOBPURSLEY**

I thought phase shift was theta over omega correct??? and the period equals two pi over omega 40 min = (2pi)/omega omgea = pi/20 min phase shift = theta over omega phase sift = (20?)/pi min now you said phase shift was (35 pi)/40 I do not see why I appologize i made a spelling...

*December 6, 2009*

**TOBOBPURSLEY**

how do we now that the phase shift is (35pi)/40 please explain THANKS

*December 6, 2009*

**PreCalculus**

I have a question I do not think anybody answered it Researches find a creature form an alienplanet. Its body temperature is varying sinusoidally with time. 35 min after they start timing, it reaches a high of 120 F. 20 min after that it reaches its next low, 104 F. How do I ...

*December 6, 2009*

**PreCalculus**

How do i find the phase shift in this problem Naturalists find that the populations fo some kinds of predatory animals vary periodically. Assume that the population of foxes in a certain forest varies sinusoidally with time. Records started being kept when time t = 0 years. A ...

*December 3, 2009*

**8th grade**

how did the survivours of Krakatoa receive help

*December 3, 2009*

**FINANCE**

go on th eenternet

*December 3, 2009*

**Precalculus**

tangent theta is equal to the derivative of sine theta over the derivative of cosine theta?

*December 2, 2009*

**Precalculus**

Sorry ok I was talking about on the unit circle how come the slope of the reference line (say if you were to angle pi/2, the reference line would be the positive y axis from y equals zero to y equals one, I think this line is called this, like if you were to draw pi/4 on the ...

*December 2, 2009*

**PreCalculus**

h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 5 9 7 1 4 6 2 0

*December 1, 2009*

**PreCalculus**

Ok I know that the slope of a straight line is the same thing as x with a dot aboce it or simply the first derivative of x on the unit circle tangent gives you the slope of the reference line right? This can be expressed using the notation expressed above but how? Thanks!

*December 1, 2009*

**physics**

On a cold winter day when the temperature is -20 degrees celsius, what is the amount of heat needed to warm internal body temp(37) the .5 L of air exchanged with each breath? Specific heat of air is 1020 J/(kg K) and that 1.0L air has a mass of 1.3g. Please help!! I don't ...

*November 30, 2009*

**Statistics (Probability)**

I have a q

*November 30, 2009*

**Psychology**

its my friend, we both have the same problems and try to see if we can get helped

*November 28, 2009*

**Psychology**

Could someone see if I got any of the questions wrong. I feel that some questions have multiple answers but there is only one that is correct. Please help. thanks a lot State whether each scenario is an example of assimilation or accommodation. 1. A child has always used a ...

*November 28, 2009*

**4th grade**

4th grader asks how to solve 8100/?=90

*November 19, 2009*

**chemistry**

a resting person requires 14.5 L of O2 per hour to maintain metabolic activities. Such a person breathes in 0.50 L of air at approximately 20 degrees C with each breath. The inhaled air is 20.9%O2 while the exhaled air is 16.3% O2. (a) how many breaths per minute does a ...

*November 19, 2009*

**math**

1/n^2=0.0278

*November 16, 2009*

**Networking**

Jack is setting up a new FTP server that is running the Windows XP operating system. This FTP server will be shared by seven different corporate departments, each identified by a user group, but access is to be restricted by department. The Domain Administrators, Departmental ...

*November 15, 2009*

**Math**

some of the worst math I've ever seen

*November 15, 2009*

**Calc**

A common inhabitant of human intestines is the bacterium Escherichia coli. A cell of this bacterium in a nutrient-broth medium divides into two cells every 20 minutes. The initial population of a culture is 59 cells. (The tolerance is 1% unless your instructor states otherwise...

*November 8, 2009*

**algebra**

A wholesaler mixed coffee beans worth $6/kg with another kind worth $8.80/kg. The 16kg mixture was worth $6.70/kg. How many kilograms of each type was used?

*November 7, 2009*

**5th grade Language**

1.i and 5 2.named and blaze 3.was and once 4.wouldn't and out 5.first and filly 6.hoarse and croaked

*November 5, 2009*

**Physics**

Projectile motion equation: y=xtan(è)-(gx^2)/[2(ucos(è))^2] where è=39.5 deg., u -34.9 met/sec & g=9.8 met/sec^2. On substitution and solving for y=0, you can get the horizontal range as 122.003 met. and thus the time required would be = 122.003/(ucos(&...

*November 5, 2009*

**English**

i think you sohould either try and find online video interviews of this per, and as cheesy as its sounds imagen you are the one asking the questions and tehy are responding to you then give your opinions on their answers. ps if you cannot find someone with online videos ...

*November 5, 2009*

**math**

it depends on the amount of ppl who would win and

*November 5, 2009*

**math**

it depends on the amount of ppl who would win

*November 5, 2009*

**Chemistry**

your teacher should give you a chart with which elements are soluble and insoluble

*November 3, 2009*

**tutor period**

what is a blog and how do you write one

*November 1, 2009*

**albebra**

c=2*3.14sqare root

*October 29, 2009*

**College mechanic vibration**

Estimate and discuss the maximum bouncing and pitching generated by your design when the car travels at 40 km/hr over a rugged terrain roughly modeled by a sine wave with 0.10 meter amplitude and 4.0 meter period. (This one does not have to be an accurate calculation. State ...

*October 25, 2009*

**math**

thanks :) that helped

*October 22, 2009*

**math**

Give the Five-Number Summary for this data set. Round your answers to the nearest tenth. 18, 22, 36, 36, 36, 44, 185, 304, 24

*October 22, 2009*

**graphic design**

the purpose of an art is to provide visual appeal. true or false

*October 22, 2009*

**social studies**

what is the geography of the great barrier reef

*October 22, 2009*

**7th grade**

What did the spanish farmer say to his chicken

*October 21, 2009*

**Calc**

This is a very confusing problem for me y = 5^3^x^2 Find y'

*October 21, 2009*

**Probability**

Given additional information that 56% of the total employees in the company are male and 50% of them are employees who have been working less than 5 years. If an employee selected at random is known to have been working for 5 years or more, what is the probability that the ...

*October 20, 2009*

**Physics**

no idea all HELP appreciated!! A shot-putter puts a shot (weight = 70.3 N) that leaves his hand at distance of 1.45 m above the ground. (a) Find the work done by the gravitation force when the shot has risen to a height of 2.15 m above the ground. Include the correct sign for ...

*October 19, 2009*

**science**

you push yoursef on a skateboard with the force o 30n and the accelerate at 0,5m/s2 find the mass of you and the skateboard together

*October 19, 2009*

**science**

find the force exerted by z rope on a 10kg mass that is hanging from the rope

*October 19, 2009*

**accounting**

preent in journal form adjusting entries that would be made on july 31,2011 the end of the fiscal year 1. apr 30, a ten month 9% note for $20,000 was received from a customer

*October 16, 2009*

**Computers**

I have a question. What should you set your margins to if you want to print out your notes and glue them to a 3 x 5 notecard?

*October 16, 2009*

**Math**

Out of the numbers divisible by 3, we picked 4 consecutive numbers. To the sum of these, we added a third of the sum, and then the half of the third of the sum. We got 225. What are those 4 numbers?

*October 15, 2009*

**math**

So, if a problem says to use the subtraction property of equality to solve an equation.. and an equation is w + 1 = 14 what am I supposed to do?

*October 14, 2009*

**math**

can someone explain what Subtraction property of equality is? I don't understand it.

*October 14, 2009*

**chemistry**

3.1x1024 atoms of He into moles?

*October 14, 2009*

**operating system**

If /home/jenny/draft and /home/alex/letter are links to the same file and the following sequence of events occurs, what will be the date in the opening of the letter? a. Alex gives the command vim letter. b. Jenny gives the command vim draft. c. Jenny changes the date in the ...

*October 14, 2009*

**Math**

The sum of a number and three times the number is 48. What is the number?

*October 13, 2009*

**pysics.**

What is the minimum work needed to push a 975 kg car 230 m up along a 17.5° incline? Assume the effective coefficient of friction retarding the car is 0.20?

*October 12, 2009*

**Maths**

thankyou so much for your help I am vey grateful, I felt you could do every value but wasn't sure if I was missing something.

*October 10, 2009*

**Maths**

which amount up to £1 cannot be paid exactly with fewer than 6 coins? is this a trick question and can all the amounts be paid?! I am really struggling with this one

*October 10, 2009*

**math 8th grade**

find 72% of 200 and i need to show work

*October 5, 2009*

**Chem**

What volume of NO measured at 1.1 atm and 1100 C, can be produced from 10.0 L of NH3 and excess O2 measured at the same temperature and pressure? Here is the balance equation 4NH3+3O2+4NO+6H20 So far this is what I have: (1.1 atm)(10.0L) __________________=.097mol NH3 .08201 x...

*October 5, 2009*

**literature**

What is the setting and the mood for the book...The View from the Cherry Tree?

*October 4, 2009*

**Literature**

Give two examples of foreshadowing from the book The View from the Cherry Tree.

*October 4, 2009*

**math**

What do you do if 3=x and equals to y? (y is 1 with 123987 zeroes?

*October 1, 2009*

**statistics**

A simple random sample of 25 has been collected from a normally distributed population for which it is know that o=17.0. The sample mean has been calculated as 342.0, and the sample standard deviation is s=14.9. Construct and interpret the 95% and 99% confidence intervals for ...

*September 30, 2009*

**Calc**

Find the limit. lim_(x->infinity)(sqrt(9 x^2 + x) - 3 x)

*September 29, 2009*

**humanities**

What are some example of "self-making" and race, class, or gender, in "Satchmo: My Life in New Orleans"? self-making is when the author tells about oneself and is making up a story about what and who they are and what they've done. any more examples of ...

*September 29, 2009*

**math**

use a commutative law to find an equivalent expression pq. an equivalent expression pq is= subtract the following -9(-3)=

*September 27, 2009*

**Math**

divide if possible -28/14 select the correct choice below & fill in any answer boxes in your choice. a. -28/14= b.the answer is underfined

*September 27, 2009*

**calculus HELP**

how do you find the domain of the function:: 14/(x^2 - 361) <-- this is all under a square root.. i have attempted this so many times and have not found the correct answer yet. how do i solve the domain when it is a square root function with a denominator???? please help! ...

*September 26, 2009*

**physics**

-121.88

*September 21, 2009*

**Calc**

I am having trouble with these two problems for my Calc class. I have tried answering a few times already, but i keep getting it wrong. Help please and thank you. For the limit below, find values of δ that correspond to the ε values. lim_(x->1)(3 + x - 3x^3) = 1...

*September 21, 2009*

**gr.10 math!**

What are the factors of 1000

*September 19, 2009*

**science**

(A rectangular brick measurses 6cm by 9cm by 20 cm and has a mass of 2.563 kilograms.) What is the brick's surface area in square centimeters, and square centimeters?

*September 16, 2009*

**science**

(A rectangular brick measurses 6cm by 9cm by 20 cm and has a mass of 2.563 kilograms.) What is the brick's surface area in square centimeters, and square centimeters?

*September 16, 2009*

**us history**

in what year was each of the 13 colonies found and by who?

*September 14, 2009*

**social studies**

what city is 36 degrees north latitude and 90 degrees west longitude

*September 8, 2009*

**calc**

It would be great to see how this is done. The prof's way of doing it is way confusing and intricate and I just started learning integrals.

*September 8, 2009*

**calc**

Air resistance acting on a falling body can be taken into account by the approximate relation for the acceleration: a=dv/dt=g-kv where k is constnat Derive a formula for the velocity of the body as a function of time assuming it starts from rest (v=0 at t=0) v=?

*September 8, 2009*

**SOCIAL STUDIES**

what are 4 effects of magnetic compasses in the 1200s?

*September 6, 2009*

**english**

i have to make a poster using the following words: main idea, theme, generalization. i have to give the defintion and give examples. any suggestion how to do it. thanks

*September 6, 2009*

**math**

what's the LCM of 9 and 15? I got 9 is that the correct answer?

*September 5, 2009*

**macro economics**

Using a Circular Flow diagram as a reference, describe how changes in one of the sectors of an economy will influence aggregate supply and demand.

*September 2, 2009*

**Grapes of Wrath**

make it rain

*August 17, 2009*

**4th grade**

no one knows its easy

*August 13, 2009*

**english Midnight's Children**

In Midnight's Children by Salman Rushdie, which character is morally ambiguous? morally ambiguous= character whose behavior discourages readers from identifying them as purely evil or purely good

*July 25, 2009*