Sunday

December 21, 2014

December 21, 2014

Total # Posts: 139

**chemistry**

Using the following thermochemical data, what is the change in enthalpy for the following reaction? 2H¿(g) + 2C(s) + O¿(g) d C¿HÂOH(l)? C2H5OH(l) + 2O2(g) d 2CO2(g) + 2H2O(l), DH = -875 kJ C(s) + O¿(g) d CO¿(g), DH = -394.51...
*December 9, 2014*

**algebra**

mrs scott bought some silk at $29.50 a yard and had $12 dollars left. if she had bought twice as much silk at $19.75 cent a yard she would have need $28 more to pay for it. how many yards did she buy and how much money had she
*November 24, 2014*

**physical**

A body of weight 150N is supported by a thin cord attached to a point in the ceiling. Another cord is attachedto the weight and pulled horizontally until the supporting cords makes an angle of 30 degree with the vertical. Draw the diagram of the arrangement and calculate the ...
*October 12, 2014*

**Pre-Calc**

A quadratic function has its vertex at the point (-5,-2). The function passes through the point (-8,-10). Find the quadratic and linear coefficients and the constant term of the function.
*September 24, 2014*

**Healthcare**

Compare the similarities and differences of the principles of communication you learned in Week One with the major components of health communication you learned in Week Eight. What observations do you have from your comparison? Include a list of the principles of ...
*July 15, 2014*

**English 4 help **

In this course,you studied literary works from the romantic period,the Victorian era,and the modern era.Describe the common themes from each era.Then explain the main elements of the historical context that contributed to the themes in each era. All I need is help on how to ...
*May 26, 2014*

**Algebra 2**

Which cosine function has maximum of 4, a minimum of -4, and a period of 2pi/3? A. y=4 cos 3 theta B. y= 4 cos 2 theta/3 C. y=4 cos theta/3 D. y=4 cos 3 theta
*May 25, 2014*

**Algebra 2**

Simplify the trigonometric expression. sin^2 theta / 1-cos theta A. 1+cos theta B. sin theta C. 1-sin theta / cos theta D. 1+sin theta / cos theta
*May 25, 2014*

**Algebra 2**

What is the theoretical probability of rolling a sum of 6 on one roll of two standard number cubes? A. 1/9 B. 5/36 C. 1/12 D. 1/6
*May 24, 2014*

**Algebra 2**

Write an equation for the translation of y=5/x that has the asymptotes x=6 and y=7.
*May 24, 2014*

**Algebra 2**

What is the 20th term of the sequence that begins -2,4,-8,16.....?
*May 24, 2014*

**Algebra **

What are the period and amplitude of the function y=2sin4 theta? A. pi/2 and 2 B. pi and 4 C. pi/2 and 4 D. pi/2 and 1 I think the answer is A. Am i correct?
*May 24, 2014*

**Math - Trigonomety**

A plane is flying at a height of 1000 feet. A passenger on the plane sees a tree and realizes the angle of depression to the top of the tree is 15 degrees and the angle of depression to the bottom of the tree is 25 degrees. How tall is the tree?
*April 27, 2014*

**Chemistry**

what would be the molality of a solution if 71g of Cl2 were added to 400 mL of acetone (D=0.788 g/mL)
*March 18, 2014*

**math**

a box contains 22 coins consisting of quarters and dimes. the total value of the coins is $3.55. determine the number of quarters and the number of dimes in the box?
*January 12, 2014*

**Algebra**

Write the equation of the line in standard form: (-3, 6); m = 1/2 (1, 0) & (-5, 3) (-5, -5) & (-1, 3)
*January 8, 2014*

**Math**

Write an equation in slope-intercept form, point-slope, or standard form for the line with the given information. Explain why you chose the form you used. a. Passes through (-1, 4) and (-5, 2)
*January 8, 2014*

**us history**

I need a word that means.. a governments position on an issue
*November 12, 2013*

**Math**

Find two numbers the exact answer is between 6x7,381
*September 24, 2013*

**Chemistry**

If 10.11 g of limestone decomposes by heat to give 8.51 g of solid calcium oxide and carbon dioxide gas, what is the mass of carbon dioxide produced?
*September 19, 2013*

**College Algebra**

I have no idea how to do this, and nobody in my family knows how to either. I have to determine the domain of the following function. f(x)=5/(3x-7)
*August 25, 2013*

**Government**

The first American voters were only white, male ---------s. What is the blank word?
*July 6, 2013*

**Government**

People who believe voting is important have high political ----c-c-. What's the missing word? Thanks.
*July 6, 2013*

**US Government **

Any person currently in --i- cannot vote. What is the blank word? Thanks.
*July 6, 2013*

**chemistry**

How many grams of ammonium fluoride are required to neutralize 972 'm of 0.00327 M sulfuric acid
*February 27, 2013*

**Mathmatics**

this is caleb and never mind this question
*February 19, 2013*

**Physics**

A 2563-kg van runs into the back of a 826-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculate the initial speed of the van.
*January 15, 2013*

**Physics**

You need to move a 128-kg sofa to a different location in the room. It takes a force of 99 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?
*January 15, 2013*

**Basic Phsyics**

A projectile is fired such that the vertical component of its velocity is 49 m/s. The horizontal component of its velocity is 60 m/s. a) how long does the projectile remain in the air? b) what horizontal distance does it travel?
*December 18, 2012*

**Basic Physics**

A baseball is hit 1.3 m above home plate. The bat sends it off at an angle of 30 degrees above the horizontal at a speed of 45.0 m/s. The outfield fence is 100 m away and 11.3 m high. Does the ball clear the fence?
*December 18, 2012*

**Basic Physics**

While standing on an open bed of a truck moving at 35 m/s, and archer sees a duck flying directly overhead. The archer shoots an arrow at the duck and misses. The arrow leaves the bow with a vertical velocity of 98 m/s. a) how long does it remain in the air b) the truck ...
*December 18, 2012*

**Basic Physics**

2.0 s
*December 18, 2012*

**Basic Physics**

A shoe flung into the air such that at the end of 2.0 m/s it is at its maximum height moving at 6.0 m/s. How far away will it be from the thrower when it returns to the launch altitude.
*December 18, 2012*

**Physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the speed of a 94-kg ...
*December 3, 2012*

**Spelling 4th grade**

Down is to dive as up is to ____________?
*November 26, 2012*

**Physics**

You are driving a 2570.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides to a halt in a ...
*November 17, 2012*

**Physics**

A 225-kg crate is pushed horizontally with a force of 690 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
*November 17, 2012*

**Physics**

You are driving a 2570.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides to a halt in a ...
*November 17, 2012*

**Physics**

A 1.31-kg block slides across a rough surface such that it slows down with an acceleration of 1.39 m/s2. What is the coefficient of kinetic friction between the block and the surface?
*November 17, 2012*

**Physics**

You are driving a 2570.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides to a halt in a ...
*November 17, 2012*

**Math**

There will be 24 people all together at george's birthday party.He wants to serve his grandmother's special fruit punch. His grandmother lives in England, where they use metric measurements in cooking. This is her recipe. Grandmothers fruit punch - serves 10 400 ml ...
*November 12, 2012*

**Math**

One day we decidid to drive from town A to town D.In order to get there,we had to drive through town B and C.It is ten miles farther from town A to town B than it is from town B to town C.It is ten miles farther from town B to town C than it is from town C to town D. It is 330...
*November 4, 2012*

**Math (kindergarten)**

go to the right.8+1=9 go to the left.1+2=3 it is 39.
*October 10, 2012*

**Pre-Algebra 7th grade.**

I have prealgebra with order of operations with a line dividor with a fraction line/divider. It says: 94-6 ____ 66(divided by) 6
*September 19, 2012*

**Algr.1**

For Nina's illness her doctor gives her a prescription for 28 pills. The doctor says that she should take 4 pills the first day and then 2 pills each day until her prescription runs ... How many pills should she take at the end of the 2nd day? ... So how many days will it ...
*August 29, 2012*

**math**

3/4 mile
*May 7, 2012*

**Physics**

Every glass window pane has two surfaces that reflect some light as it passes through; why doesn't interference effects show up routinely in every house window? If you could explain this I'd really appreciate it.
*April 30, 2012*

**Physics**

If the two protons and the are all at rest after the collision, find the initial speed of the protons.
*April 15, 2012*

**physics**

An R-C circuit is driven by an alternating voltage of amplitude 110 and frequency . Define to be the amplitude of the voltage across the capacitor. The resistance of the resistor is 1000 , and the capacitance of the capacitor is 1.00 . I need help on what to do I'm lost ...
*March 6, 2012*

**7th grade math**

3 11/21+ 2 8/21=
*March 5, 2012*

**Ground School**

What is the best way for me to learn more about airport operations??
*February 20, 2012*

**calculus**

Find the equation of the line given that f(x)=10^x and the point A is at x=log10(5).
*February 2, 2012*

**American Sign Language**

I need help for how to sign my 2 sentences in ASL. can you please help me? here are my 2 sentences: 1. I have been noticing that on bus or trolley young people are not courteous to give up her/ his seat to older people. 2. I had an idle chichat with my aunt about politics I ...
*January 27, 2012*

**calculus**

use differentials to estimate ln(e^4 +1) - ln(e^4)
*December 7, 2011*

**Math (Calculus)**

Find the derivative of (ln(tan(x))/3pi
*December 5, 2011*

**statistics**

(2.75-2.86)/2.86= (-0.11)/2.86= -0.0384 -4% is nearest percent of change.
*September 26, 2011*

**Math**

is 0.9 greater than 0.789
*September 21, 2011*

**math **

explain how you can find the sum 25 + 59 without paper, pencil or calculator. Find the sum? How do I do this
*September 13, 2011*

**pre calc**

find the exact solution algebraically and check it by substituting into the orginal equation. 1. 36(1/3)^x/5=4 2. 32(1/4)^x/3=2
*June 12, 2011*

**math**

i have a HUGE math test tomorrow, And I need some help on Factoring. Any websites that will give me good tutorials? I've found some but its total bs.
*June 8, 2011*

**Math**

-2/9 x 2 1/4
*May 22, 2011*

**science**

what was an example of a vessel that came to the surface by a ships signal
*April 12, 2011*

**math**

set out in tens and ones 32 + 10 = 43 + 54 = 28 + 61 = 15 + 73 =
*March 30, 2011*

**algebral**

how to write an algebrale equation to model situation te number of gal of water used to water trees is 30 times the number of trees
*March 19, 2011*

**Pre Algebra**

I need help figuring out simple interest and the balance of an account. Example P = $525, r = 6%, t + 9 years
*February 9, 2011*

**Pre Algebra**

I need help figuring out simple interest and the balance of an account. Example P = $525, r = 6%, t + 9 years
*February 9, 2011*

**chem**

I apologize but in the original data at the top of my answer the heat capacity should read: (4.184 joules / (gram x degree celsius))
*January 24, 2011*

**chem**

137 x 10^7 km^3 1.03 g / cm^3 4.184 g / cm^3 We need to convert the volume of the oceans to cm^3 so density (g/cm^3 is in the same units. 1 km = 1000 meters 1 meter = 39.37 inches 1 inch = 2.54 cm 1 km x (1000 meters / 1km) = 1000 meters 1000 meters x (39.37inches / 1 meter...
*January 24, 2011*

**social studies**

no
*December 1, 2010*

**Calculus**

Use implicit differentiation to find an equation of the tangent line to the curve y^2 = x^3 (26 − x) at the point (1, 5).
*November 16, 2010*

**Calculus**

Use implicit differentiation to find an equation of the tangent line to the curve y^2 = x^3 (26 − x) at the point (1, 5).
*November 16, 2010*

**8th grade**

How do you calculate the slope of a line?
*November 8, 2010*

**8th grade**

How do you calculate displacement and distance and velocity? (science)
*November 8, 2010*

**social studies**

what is the definition of values
*October 21, 2010*

**Physics**

A soccer player launches a ball at an angle of 40 degrees, with an initial velocity of 23 m/s. What are the horizantal and vertical for this problem??
*October 14, 2010*

**Math**

thank you!
*October 5, 2010*

**Math**

another question to see if i am right. when im rounded to the nearest ten, im 80. the digit in my tens place is 5 more than the digit in my ones' place. who am i? it is 83. correct?
*October 5, 2010*

**Math**

it is 57.
*October 5, 2010*

**Math**

could be 62 ?
*October 5, 2010*

**Math**

60 ?
*October 5, 2010*

**Math**

When I'm rounded to the nearest ten, I'm 60. The digit in my ones' place is 2 more than the digit in my tens' place. Who am I?
*October 5, 2010*

**social studies**

what aresome landforms in the southwest region
*September 24, 2010*

**Physics**

A physics student sits by the open window on a train moving at 25 m/sec towards the east. Her boyfriend is standing on the station platform, sadly watching her leave. When the train is 150 meters form the station, it emits a whistle at a frequency of 3000 Hz. What is the ...
*April 23, 2010*

**Physics**

any one??
*April 22, 2010*

**Physics**

A physics student sits by the open window on a train moving at 25 m/sec towards the east. Her boyfriend is standing on the station platform, sadly watching her leave. When the train is 150 meters form the station, it emits a whistle at a frequency of 3000 Hz. What is the ...
*April 22, 2010*

**physics**

ok figured out intensity need help with other 4
*April 21, 2010*

**physics**

An electronic point source emits sound isotropically at a frequency of 3000 Hz and a power of 34 watts. A small microphone has an area of 0.75 cm2 and is located 158 meters from the point source. a) What is the sound intensity at the microphone ? To find intensity i tried I=...
*April 21, 2010*

**Calculus**

Find the volume, V , of the solid obtained by rotating the region bounded by the graphs of x = y2, x = squareroot(y) about the line x = −1.
*February 2, 2010*

**science**

Expain why,it is easier to break an egg by stricking at the flat side, other than at the pointed edges.
*January 24, 2010*

**algebra**

Trying to figure out my sons math. been way to long!!!! The question is find the slope for y = 3
*December 17, 2009*

**algebra**

find the slope for 2x - 3y = 6
*December 17, 2009*

**Pre-Algebra**

well wut do they call them
*September 15, 2009*

**math**

Rational expressions in lowest terms 4y ------------ 2xy + 4y
*May 12, 2009*

**college**

4y/2xy+4y rational expressions HELP!!! I need to express this in the lowest form.
*May 12, 2009*

**4th grade Vocabulary**

Cell phone
*May 4, 2009*

**social studies**

What is the Green Treaty Line?
*April 30, 2009*

**Chemistry**

According to the principle of electrical neutrality, a water sample must have the same number of anions and cations. Assuming that a water sample contains 40 mg/L of chloride, 100 mg/L sulfate, and 10 mg/L nitrate, estimate the maximum amount (in mg/L) of sodium that could be ...
*April 29, 2009*

**6th grade**

I have to find the area of a circle. It says to round to the nearest unit, but I'm confused about what unit it is talking about. Any thoughts?
*April 20, 2009*

**Biology**

describe the effect of cyanide and arsenic on cellular repiration. Include the effect of these poisons on the electron transport chain. Be specific, and diagrams can be used to elucidate the process.
*February 16, 2009*

**Algebra**

I am supposed to find the equation for the boundary lines, using the points 0,4 and 3,5. I got 5-4/3-0, which plugged into y=mx+b would equal y=1/3x+b. The book says b equals four, but where does this number come from? Thanks!
*January 31, 2009*