Friday

February 27, 2015

February 27, 2015

Total # Posts: 1,211

**physics**

A proton moves parallel to an electric field between points A and B. The change in the proton's electric potential energy is EPEB – EPEA. If the proton is removed from point B and replaced with an electron, how does the change in electric potential energy of the ...
*July 28, 2014*

**Physics**

Two objects separated by a distance r are each carrying a charge –q. The magnitude of the force exerted on the second object by the first is F. If the first object is removed and replaced with an identical object that carries a charge +4q, what is the magnitude of the ...
*July 28, 2014*

**Help english**

I need help with English comprehension.
*July 17, 2014*

**math**

find the straight line that passes through point (2,4) and is perpendicular to line 2x + 12y - 6 = 0
*July 5, 2014*

**computer system organization**

2. You're an IT professional, and your boss has asked you to prepare a briefing for senior staff on the comparative advantages and disadvantages of three competing tape drive technologies: Digital Linear Tape (DTL), Advanced Intelligent Tape (AIT), and Linear Tape Open (...
*July 1, 2014*

**Chemistry**

A solution of X2CO3 has a concentration of 15.2 g/dm^3. 25 cm^3 of this solution require 27.5 cm^3 of 0.2 M HCl for complete reaction. Calculate the ralative atomic mass of X
*June 28, 2014*

**math**

A cylinder is 12cm tall and has a diameter of 3 cm. What is the surface area?
*June 8, 2014*

**math**

A polyhedron has 6 faces and 4 vertices. Use Euler's formula to calculate the number of edges.
*June 8, 2014*

**Algebra**

Using a standard 52-card deck, whats the probability of being dealt a pair of aces in a 5-card hand?
*May 28, 2014*

**English**

Connect the first act of Love's Labor's Lost to a current event
*May 15, 2014*

**Chem**

Calculate the absolute error in a mole ratio. Determine mole ratio of Zinc iodide. error in mass (g) was +- 0.005 Mass of reacted Zn = 0.16 Mass of iodine = 1.134 experiment value= 1:1.95 calculate absolute error in 1.95?
*May 15, 2014*

**Physics**

A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at ...
*May 4, 2014*

**Algebra**

How would you simplify b^4=25/4
*April 22, 2014*

**Science**

when the interior of a car absorbs sunlight and warms up.
*April 15, 2014*

**MATH**

In triangle PQR, <P=90 degrees, <Q=10.5 degrees and RQ=120 cm. Find PR.
*April 15, 2014*

**Math**

In triangle PQR, <R=90 degrees, <Q=10 degrees and RQ=16 cm. Find PR.
*April 15, 2014*

**Chemistry**

The equilibrium constant Kc^i is 3.2x10^-34 at 25 degrees C for 2HCl(g) -> H2(g) + Cl2 (g). The equilibrium constant Kc^ii is .10 at 25 degrees C for 2ICl (g) -> Cl2 (g) + I2 (g). a) Calculate the equilibrium constant Kc for the reaction below at 25 C Cl2(g) + I2 (g) -&...
*March 13, 2014*

**Math**

Put the quadratics below into vertex form by completing the square. state the vertex. y=2x^2 - 4x-6
*March 8, 2014*

**Math**

Put the quadratics below into vertex form by completing the square. state the vertex. a) y=x^2 - 4x-21
*March 8, 2014*

**Chemistry**

Is the reaction between sodium sulfate and strontium nitrate endothermic or exothermic and why?
*March 5, 2014*

**Math **

A rocket follows a parabolic trajectory. After t seconds, the vertical height above the ground, in metres, is given by H=37t - t (squared). What is the maximum height of the rocket after 10 seconds? What is the max height of the rocket? What time does it reach the maximum ...
*March 5, 2014*

**physics**

What is the momentum of a 4 Mg semi truck going 30 m/s south?
*March 5, 2014*

**Language**

Thank You Writeacher
*March 4, 2014*

**Language**

What's the easiest way to tell the difference between participles and gerund? Besides that one is a adjective and the other one is a noun and the type of questions they ask.
*March 4, 2014*

**Math**

Please can you tell me how to find the percentage and probability
*February 28, 2014*

**physics**

Explain why should torques, not forces, play essential roles in the following actions. (a) open or close a door (b) tighten or loosen a screw using a wrench c) "Give me a place to stand, and I shall move the Earth with it"
*February 24, 2014*

**math**

Please can you tell me which method should I use to solve probability because I don't understand how to solve probability for grade 6
*February 24, 2014*

**math**

Tara has driven 70 miles of a 154 mile trip. If she averages between 50 and 57 miles per hour, which of the following is a reasonable amount of time it will take her to complete the trip?
*February 24, 2014*

**Math**

How can you solve this inequality using an algebraic method. -x^3+2x^2+4x-8 > or equal to 0 (x-2)(-x+2)(x+2) > or equal to 0
*February 22, 2014*

**Pre calc**

8sinxcosx=1 I don't know where to go after 2sinxcosx=1/4
*February 5, 2014*

**Chemistry**

In a similar experiment, a student needs a 0.50 M KOH solution (MM = 56.11 g/mol). The student only has a 50.00 mL volumetric flask. How much KOH should be added before the flask is filled with water?
*February 2, 2014*

**world history**

Oops sorry, but it's an abbreviation for: political, economic, religious, military, social power
*February 2, 2014*

**world history**

I need to find out if Obama mentions any PERMS power in this section of the State of Union 2014 Speech. I'm stuck and it doesn't seem like he mentions any political power, military power, etc. --------------------------------------- As Prepared for Delivery – Mr. ...
*February 2, 2014*

**Consumer Math**

is there any tutorial i can watch to get this question right?
*January 31, 2014*

**Chemistry**

Where can I find some chemical equations about land pollution? Please give me the website link.
*January 28, 2014*

**Chemistry**

Can you list some chemical equations about water pollution? At least 5.
*January 28, 2014*

**ela**

I'm doing an essay on how author's language expresses change in character. First, I need to know how David changed from a particular event in the story David's Haircut by Ken Elkes. I want to say that David changed from the haircut or that David changed from the ...
*January 27, 2014*

**math**

A teacher has a 10m roll of ribbon 3 cm wide . She cuts off 7 equal lengths 3 cm wide to make team bands for PE . There is 90 cm of ribbon left . How long is each team bands
*January 26, 2014*

**Fractions**

how do I solve for X? can you show me how?
*January 26, 2014*

**Fractions**

Sam has 9 yellow pencils in his desk. 3/4 of his pencils are yellow. How many pencils does Sam have in his desk? 3rd grade fraction, slightly confusing to me
*January 26, 2014*

**Math**

Thank you both! :)
*January 22, 2014*

**Math**

Would it be 60%????
*January 22, 2014*

**Math**

Express 3/5 as a percent.
*January 22, 2014*

**social studies**

I need to answer the questions on my study guide, it is my homework but I forgot my book,I need to read chapter 3 it's about our earth,s renewable and non renewable resources.where else I find out about it
*January 21, 2014*

**physics**

A mountain biker rides a given distance due north, then drives twice that far to the west. At the end of the trip the direct distance from the starting point is 112meters. What is the length of each leg of the trip and in which direction is the end point?
*January 12, 2014*

**Earth science**

In a few sentences, explain how information from paleoglaciation and paleomagnetism support the idea that continental plates have moved over the past several million years.
*January 10, 2014*

**earth**

Suppose a geologist is studying two distinct areas next to a spreading ridge. The magnetic direction of the minerals in the oldest area is opposite to the magnetic direction of minerals in the newest area. (a) Which area is closest to the centre of the ridge, the older or ...
*January 9, 2014*

**Math**

Cause if f(x)=3x-1 F(5) would be 3(5)-1 Which is 14 But someone told me the answer was 16
*December 26, 2013*

**Math**

Would the answer be 16?
*December 26, 2013*

**Math**

Let f(x) be a linear function with f(1) = 2 and f(3) = 8. Find f(5) How do u solve it like the steps
*December 26, 2013*

**Math**

So the equation is -3(x+1/2)? Like there's no Y= in it?
*December 26, 2013*

**Math**

Find the equation of the perpendicular bisector of the line segment joining the points (1, 2) and (-2, 1) Does it mean I have to find the line. Then find a line that cuts that line in to half because perpendicular bisector
*December 26, 2013*

**Math grade 9**

Find the distance from the point (5, 6) to the line x + y = 3 I don't get the x+y=3 mean
*December 20, 2013*

**Science**

Explain how an increase in agricultural activity might affect a local fishery.
*December 19, 2013*

**Science**

Design an experiment to determine what level of a new synthetic insect killer called Beegone is lethal to geraniums.
*December 19, 2013*

**Science**

A persistent organic pollutant is estimated to have a half-life of 30y. If 3 tonnes of the chemical exists in a polluted area today, how much of the chemical will remain after 120y.
*December 19, 2013*

**biomed**

Why are DRIs not shown on food labels?
*December 17, 2013*

**science**

Explain why a chemical with a long-half life may create problems in the environment?
*December 16, 2013*

**science very urgent need help**

An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a large difference ...
*December 16, 2013*

**Science, very urgent please help**

An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a large difference ...
*December 16, 2013*

**Math please help urgent**

In triangle ABC, D bisects side BC, G bisects side AB, and the points E and F trisect side AC. What is the area of the shaded polygon, if the area of ABC is 108? I tryed to find the area of triangles on the side and I figured that if you put a line from the top of the triangle...
*December 7, 2013*

**Math**

In triangle ABC, D bisects side BC, G bisects side AB, and the points E and F trisect side AC. What is the area of the shaded polygon, if the area of ABC is 108? I tryed to find the area of triangles on the side and I figured that if you put a line from the top of the triangle...
*December 7, 2013*

**Math**

In triangle ABC, D bisects side BC, G bisects side AB, and the points E and F trisect side AC. What is the area of the shaded polygon, if the area of ABC is 108? I tryed to find the area of triangles on the side and I figured that if you put a line from the top of the triangle...
*December 7, 2013*

**Math**

In a triangle ABC, AC = 36, BC = 48, and the medians BD and AE to sides AC and BC, respectively, are perpendicular. Find AB I tryed to find the sides using Pythagorean theorem but it's not working
*December 7, 2013*

**Math**

the right triangle ABC, the altitude from vertex C divides the hypotenuse into two segments, one of length 2 and the other of length 16. Find the perimeter of triangle ABC.
*December 7, 2013*

**child care**

True or False 80% of offenders of Shaken Baby Syndrome have no previous history of child abuse.
*December 1, 2013*

**Physics**

To solve this problem, you'll need the tension formula which is T=Ma. T is tension, mass M is weight Mg and tension or in other words the mass that is on the surface, & a is acceleration. M=3kg a=2.5m/s2 T=? Just plug it into the formula... T=(3kg)(2.5m/s2) T=7.5N
*November 30, 2013*

**Math**

I'm confused, please help. If a quarterback had 112 positive yards and 61 negative yards what was his total yardage, should I add both together?
*November 25, 2013*

**Math**

Thank you soooooooo much Ms. Sue
*November 25, 2013*

**SCIENCE**

how can I transcibe this into mRNA? DNA- T A C G A C T A A C G T C A G T A G
*November 12, 2013*

**science**

What is the height (in miles) for a ( television satellite to be placed above the equator of Earth to rotate at the same speed as Earth and be able to relay pictures that have been beamed to it back to another place?
*November 12, 2013*

**science**

I do not know
*November 11, 2013*

**Child Develpoment**

What kind of experiences do you have as a child that will play a role in your development?
*November 7, 2013*

**Chemistry AS **

CALCULTE
*November 6, 2013*

**Math**

This is kind of vague but does anyone know what is important to know while learning about "Modeling Data With Quadratic Functions" ?
*November 4, 2013*

**math**

The path of a cannonball is a parabola modeled by the equation y= 55 + x - 0.002x^2, where x and y are both measured in feet. In this model, the cannonball starts at the point (0,55) and travels to the right. The ground is represented by the x-axis. Determine the horizontal ...
*October 30, 2013*

**ENGLISH**

What did "catch a cold" mean when Shakespeare first used it?
*October 28, 2013*

**English**

Shakespeare invented many familiar words and phrases. Find five examples that Shakespeare invented and that we still use today. Define what they meant in Shakespeare's time and what they mean now. (I tried to look some up but they did not give the information on what they ...
*October 28, 2013*

**Math**

5/6
*October 23, 2013*

**Algebra 2**

How would you find x and y? [2x 1] [1 3] [-4 -9] = [2 0] [2 -y] [2 6]
*October 21, 2013*

**Algebra 2**

I need help in understanding how to multiply the following matrix: 1/4 [ 4 0 -3 1] [12 16 6 -4] [0 -2 5 8]
*October 20, 2013*

**physics**

When a 58 gram tennis ball is served, it accelerates from rest to a speed of 45 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 44 cm. What is the magnitude of the net force acting on the ball?
*October 16, 2013*

**history**

a british soldier
*September 26, 2013*

**7th Grade**

I dont like science...:]
*September 16, 2013*

**Chemistry**

When 0.03 moles of aluminum sulfate are dissolved in enough water to make 266 mililiters of solution, what is the molarity of sulfate ions? Answer in units of M
*September 8, 2013*

**math**

craig reads a book with 10 pages in the morning a book with 26 pages before dinner and a book with 10 pages after dinner find the mode of the number of pages in the books that craig read
*September 5, 2013*

**Algebra 1**

I had te same thing!! But at the back of te book the answer is (60-w) ft. And I am confused how yet got it!
*September 2, 2013*

**Algebra 1**

A rectangular garden that is w ft wide is enclosed by 120ft of fencing. How long is the garden?? All I need is an expression. I know that u can't solve this ptoblem because it doesn't give you enought information.
*September 2, 2013*

**Algebra 1**

Explain the difference between the following two phrases. Eight less than a number Eight is less than a number
*September 2, 2013*

**Physics**

An infinitely long line of charge has linear charge density ë. Find the energy density of the electric field at a point a radial distance r from the wire. (Use the following as necessary: å0, ë, r.)
*August 31, 2013*

**physics**

The dome of a Van de Graaff generator has a diameter of 32.0 cm and is surrounded by dry air with a 'breakdown' electric field of 3.00 106 V/m. What is the maximum potential of the dome?
*August 28, 2013*

**physics**

A uniformly charged insulating rod of length 19.0 cm is bent into the shape of a semicircle. The rod has a total charge of −8.50 ìC. Find the electric potential at O, the centre of the semicircle.
*August 28, 2013*

**physics**

A uniformly charged insulating rod of length 19.0 cm is bent into the shape of a semicircle. The rod has a total charge of −8.50 ìC. Find the electric potential at O, the centre of the semicircle.
*August 28, 2013*

**chem**

1. Suppose that a recipe calls for an oven temperature of 189°F. Convert this temperature to degrees Celsius and to kelvins. --I found that Celsius is 87.2, plug it in K=C+273, got 360.2 but it was wrong. (e) Neon, the gaseous element used to make electronic signs, has a ...
*August 11, 2013*

**FINANCE**

you want to retire in 30 years. You intend to invest $200 per month into a mutual fund that you expect to return 12% per year (1% monthly). If you continue making these monthly investments for 30 years, what amount of money will you have at the end of the 30th
*June 25, 2013*

**More math linear equation help?**

I'm looking at this graph where I see a line AB with the points (-2,2) and (2,8). Then I have to do the following: a) Find the length of AB b) Find the midpoint of AB c) Write an equation for the line going through AB I don't understand how to do part a and c, so could...
*May 31, 2013*

**Math Linear function help?**

How do you write an equation of a line in slope intercept form if two points are given? Ex. Say you were given the points (0,6) and (4,3)? What would you do?
*May 31, 2013*

**Calculus**

A rancher wants to build a rectangular pen with an area of 150 m2. Let W be the width of the pen and L be the length of the pen. a. Find an equation for the perimeter P in terms of W and L . b. Use the given area to write an equation that relates W and L . c. Find the pen ...
*May 26, 2013*

**Algebra 2**

Thank you
*May 18, 2013*

**Algebra 2**

State the possible number of imaginary zeros of f(x)= 2x^3 - 4x^2 + 8x - 3. 0,1,3?
*May 18, 2013*

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