Friday

February 12, 2016
Total # Posts: 5,252

**Physics**

The displacement of a block of mass 439g 439 g attached to a spring whose spring constant is 66N/m 66 N m is given by x=Asin(ωt) x A s i n ω t where A=12cm A 12 c m . In the first complete cycle find the values of x x and t t at which the kinetic energy is equal to ...
*February 10, 2016*

**Physics Grade 10**

The speed limit near a school is 30km/h but Joe Cool thinks he can ignore it. He is driving at 60km/h. To make matters worse, he is talking on his cell phone. Suddenly a child rides his bicycle out of school grounds and across the road on the pedestrian crossing. The maximum ...
*February 10, 2016*

**Personal learning plan (english?)**

What are some visual, auditory, reading/writing and kinaesthetic learning activities done in high schools?
*February 10, 2016*

**science**

Imagine a Rip van Winkle type who lives in the mountains. Just before going to sleep, he yells, "WAKE UP", and the sound echoes off the nearest mountain and returns 7.6 hours later. Find the distance between Rip and the imaginary mountain. I have this equation s= v(...
*February 7, 2016*

**physics**

A bullet of mass 0.08kg is fired horizontally into a 10kg block which is free to move. If both bullet and block move with a velocity of 0.6m/s after the impact, find the velocity with which the bullet hits the body
*February 7, 2016*

**English**

Please, I don't want to complicate my life, so, what's the best effective way to write a topic sentence for my body paragraphs?
*February 7, 2016*

**Calculus**

Using the definition of the derivative, find the equation of the tangent line to y=2x-1/2 at (1/2,-1) Thanks!!
*February 5, 2016*

**Physics- Help please!**

A guy riding a buffalo is chasing you at a top speed of 50 km/h, you are well ahead of the rider by 2 km, but your speed is only 20 km/h. How much time do you have to come up with a better plan?
*February 4, 2016*

**Physics**

A guy riding a buffalo is chasing you at a top speed of 50 km/h, you are well ahead of the rider by 2 km, but your speed is only 20 km/h. How much time do you have to come up with a better plan?
*February 4, 2016*

**Introductory Accounting **

The question is Burlin company starts the year with $188,000 in assets and $37,600 in liabilities. Net income for the year is $47,000, and no dividends are paid. How much is owners' equity at the end of the year? So what I thought what i would have to do is add the 188,000...
*February 3, 2016*

**Social Studies**

That is not a valid link
*February 1, 2016*

**Social Studies**

Hi, I'm having a really hard time understanding this concept. I know the answers because my teacher told us them but I don't know why they are the answers. Could you explain them please? 1. Professor Roth's rule is that any student who uses a cell phone in class ...
*February 1, 2016*

**science **

If exponential growth occurs in the population of a species of predator, the population of its prey will most likely decrease quickly. increase slowly. stay the same. experience exponential growth.
*February 1, 2016*

**Physics**

A 300g particle oscillating in SHM travels 11cm between the two extreme points in its motion with an average speed of 65 cm/s. a) Find the angular frequency b)The maximum force on the particle c)The maximum speed
*January 31, 2016*

**Science**

Describe one observation astronomers use to show that the universe is expanding
*January 31, 2016*

**Science**

-Explain how and when the universe formed according to the big bang theory? -Explain how and when our solar system formed? -Describe one observation astronomers use to show that the universe is Expanding?
*January 31, 2016*

**maths/physics**

4. Write down a diﬀerential equation to express each of the following relationships: (a) The rate at which the volume of a sphere changes with radius is proportional to the square of the radius. (b) Gravitational attraction F between two given bodies of masses m1 and m2...
*January 28, 2016*

**Physics (**

3. Terminal velocity of an object in freefall is given by Vt = root 2gMA/Cdñ , where g is gravitational acceleration,Cd is the coefficient of drag, p is air density, and MA is the ratio M/A of mass M to ‘downwards facing’ area A. For a falling sphere of radius...
*January 28, 2016*

**Physics (Gravitation)**

sorry, to correct the question. Ve= root 2GM/r Where G is the gravitational constant 6.8x10^-11, M is 10^22 + r^4 if possible, please can you provide a step by step answer to the question
*January 28, 2016*

**Physics (Gravitation)**

2. To leave the gravitational ﬁeld of a planet, a space rocket must be launched at an escape velocity of: ve =r2GM r , where G is the gravitational constant G ¡Ö 6.8¡Á10−11Nm2/kg2, M is the mass of the planet and r is its radius. Suppose ...
*January 28, 2016*

**ELA**

Explain 1 External and 1 Internal conflict From the book Found by: Margret Peterson Haddix. Make sure it includes: who it involves and how it is solved.
*January 25, 2016*

**math **

I am an even. number the sum of my digits equals 7. I am greater than 40 and less than 50. what number am I?
*January 25, 2016*

**Science**

1. Which of the following traits is acquired? A.) The number of petals that grow in a plants flower B.) the wing shape of a wild bird C.) The ability of some gorillas to learn sign language** D.) A cheetah’s ability to run faster than any other land animal 2. The height ...
*January 25, 2016*

**Help Please!!!!**

ELA.. English Language Arts
*January 24, 2016*

**Help Please!!!!**

Explain 1 External and 1 Internal conflict From the book Found by: Margret Peterson Haddix. Make sure it includes: who it involves and how it is solved.
*January 24, 2016*

**Help...**

What are the major stars of Gemini?? Name 4 of them... Explain the myth behind the constellation "the twin"
*January 22, 2016*

**Help....**

-list some of George Washington precedent -describe Thomas Jefferson achievement before becoming president of the United States - why was Lewis and clark expedition important?
*January 21, 2016*

**Science**

Thank you so much I got them all right!
*January 21, 2016*

**math**

Find the domain of the given function f. (Enter your answer using interval notation.) f(x) = 1/(x2 − 8x + 16)
*January 20, 2016*

**math**

A right triangle is drawn on a coordinate plane. Its base is the line segment between (2, 2) and (9, 2). The hypotenuse is a line segment that begins at (2, 2) and has slope 1.25. Find the coordinates of the third point.
*January 20, 2016*

**Precalculus**

Find every point on the horizontal line y = 5 that is a distance of 5 units away from the point (6, 1).
*January 20, 2016*

**French**

are these sentences correct J'ai mangé des pâtes delicieuses J'ai mangé de delicieuses pâtes
*January 20, 2016*

**Help....**

Should cellphone be used at school everyday!!! Why or why not...
*January 19, 2016*

**Physics (Feilds)**

Show that the gravitational potential at the surface of the Earth is -64 MJ kg-1, given the surface gravitational feild strength is 9.8 N kg-1 and the mean radius of the Earth is 6400 km.
*January 19, 2016*

**chemistry**

describe what happen when a piece of wet red litmus paper is passed through a hydrogen gas.
*January 17, 2016*

**chemistry**

describe what happen when a piece of wet red litmus paper is passed through a hydrogen gas.
*January 17, 2016*

**Chemistry**

At pH 9 what will the ratio of ammonium to ammonia be? The pKa of ammonium is 9.24?
*January 17, 2016*

**Physics**

Hi Damon Can you please explain how you got 19 ? and why is it being divided by 1.7 ? Thanks! Sarah
*January 17, 2016*

**Physics**

The diameter of our disk-shaped galaxy, the Milky Way, is about 1.7E+5 light-years (ly). The distance to the Andromeda galaxy, which is the spiral galaxy nearest to the Milky Way, is about 1.9E+6 ly. If a scale model represents the Milky Way and Andromeda galaxies as dinner ...
*January 17, 2016*

**Algebra/math**

A teacher is showing her class how to fold a square piece of paper to create a paper cup. One of the steps is shown below. According to the measurements, what is the length of x, in inches?
*January 16, 2016*

**Math**

A cookie recipe calls for 2/3 of a cup of flour and makes half a dozen cookies. How many cookies can you make if you have 9 cups of flour and want to use it all? I came up with an answer of 81 cookies by using a proportion. 2/3 over 6 (because half a dozen cookies is 6 cookies...
*January 15, 2016*

**Math**

The record for the fastest speed on a bicycle is 133 kilometers per hour. How long would it take a person traveling at this speed to travel 365.75 kilometers
*January 15, 2016*

**Chemistry**

The concentration of barium ions in any solution can also be determined via gravimetric analysis. An impure sample of barium nitrate with a mass of 1.234 g, is completely dissolved in water and the resulting solution is reacted with an excess of aqueous sodium sulfate. A ...
*January 13, 2016*

**Chemistry**

The concentration of barium ions in any solution can also be determined via gravimetric analysis. An impure sample of barium nitrate with a mass of 1.234 g, is completely dissolved in water and the resulting solution is reacted with an excess of aqueous sodium sulfate. A ...
*January 13, 2016*

**physics**

Assume the truck is going at v0 = 25 m/s, and you're 20 m behind the truck. You decide to accelerate at a = 1.0 m/s2 to pass the truck. To pass safely, you also want to pass the truck by 20 m before moving back to the lane. Part A ) Estimate the time interval needed to ...
*January 13, 2016*

**Physics**

Thank you so much!!!
*January 13, 2016*

**Physics**

what would I solve for when I do the conservation of momentum at the bottom of the block with the bullet?
*January 13, 2016*

**Physics**

A 0.15kg bullet is fired into a 1.85kg block that is hanging from a 45cm string. What minimum initial bullet speed is required if the bullet and block are to make one complete revolution? Please show all work. I need this question answered as soon as possible!
*January 13, 2016*

**physics**

A ball is thrown up onto a roof, landing 4 sec later at height of 20m above the release level. The balls path just before landing is angled at 60 degree with the roof. a) find the horizontal distance d it travels. b) what is the magnitude of the balls initial velocity? c) what...
*January 12, 2016*

**Math**

describe a situation where a trend line would be useful
*January 12, 2016*

**math help please**

48/3 = 16 2/3= 16x2= 32 she sold 32 muffins
*January 12, 2016*

**Math**

log2(-3sinx)=2log2(cosx)+1 solve for x
*January 12, 2016*

**Chemistry**

Compound X contains only carbon, hydrogen, nitrogen, and chlorine. When 1.00 g of X is dissolved in water and allowed to react with excess silver nitrate, AgNO3, all the chlorine in X reacts and 1.95 g of solid AgCl is formed. When 1.00 g of X undergoes complete combustion, 0....
*January 6, 2016*

**math**

Roma spent 30% of the money she bought to the mall..If she spent 450.00 only,how much did she have with her when she went to the mall?
*January 6, 2016*

**math**

after spending 80% of her money Lei has P100.00 left. How much was her money before
*January 5, 2016*

**science**

Suppose the height of the net is 0.800 m , and the court's border is 11.2 m from the bottom of the net. Use g =10 m/s2 and find the maximum speed of the horizontally moving ball clearing the net..
*December 16, 2015*

**Math**

A contractor buys 14 yd of nylon carpet and 20 yd of wool carpet for $1738. A second purchase, at the same prices, includes 16 yd of nylon carpet and 25 yd of wool carpet for $2102. Find the cost per yard of the wool carpet.
*December 13, 2015*

**pobability**

Suppose that 16% of the CD's that are distributed are defective. If you choose 5 CD's randomly, what is the probability that at least 1 of them is defective?
*December 11, 2015*

**Math **

How do integrate this with respect to x? integral of ((x^y)/y!)e^(-2x) from 0 to infinity The e is an exponential. The answer is supposed to be (1/2)^(y+1) but I don't know the steps to getting it.
*December 10, 2015*

**math**

Measuring number of surface of the rectangle is 128.If we reduce the length of 4 times, then the number is 96cm2.What is the perimeter?
*December 10, 2015*

**geometry**

c//d,<7 and< are= corresponding angles
*December 9, 2015*

**Chemistry**

Nevermind - I think I see what I did wrong. I was using 25 mL as my volume for hydrogen peroxide, when I should have been using 20 mL since that was the volume being added. Though I don't necessarily understand how that's the volume that needs to be used.
*December 9, 2015*

**Chemistry**

a 5.000ml aqueous sample containing hydrogen peroxide as diluted to 25ml and analyzed by titration with permanganate. 2MnO4- + 5H2O + 6H+ --> 5O2 + 2Mn^2+ + 8H2O The sample required 42.8 mL of 0.0175 M permangante to reach the end point. What is the concentration of H2O2 in...
*December 9, 2015*

**geography**

describe the impact the french and Indian war had on Florida?
*December 9, 2015*

**Chemistry**

Is it true that the higher the boing point, the higher the vapor pressure?
*December 8, 2015*

**Chemistry (I tried to do more)**

I think the order of decreasing vapor pressure is Acetamide, Acetic Acid, Propanal, and Isobutane. The trend is the higher the boiling point, the lower the vapor pressure. Is this right? If not, please explain.
*December 8, 2015*

**Chemistry**

Rank the following in order of decreasing vapor pressure, and briefly explain the observed trend in vapor pressure: Acetic Acid Isobutane Acetamide Propanal
*December 8, 2015*

**Chemistry**

Would copper (II) phosphate be nonpolar?
*December 7, 2015*

**Math**

The distance a bicycle travels with each turn of its wheels is about 3 1/7 times the tire diameter. The tires on Mike's bicycle have a diameter of 24 1/2 inches. How far does it travel with each turn of the wheels?
*December 7, 2015*

**Chemistry**

How can you tell if a compound is polar or nonpolar? Is it just by lewis structures? what would copper (II) phosphate be?
*December 7, 2015*

**Chemistry**

How do you determine it then?
*December 7, 2015*

**Chemistry**

When given different elements and asked for the highest boiling point, do you figure out the molar mass and pick the highest one as the highest boiling point?
*December 7, 2015*

**Math**

6x=24
*December 6, 2015*

**Math**

That polynomial can't be factored. Double check that you copied the equation correctly, then check out mathportal dot org.
*December 4, 2015*

**Social Studies**

Describe the role of shariah in Islam. What types of laws would one expect to find within Islamic governments, and how are they enforced? This was one of my questions on my homework, and I can't figure out a solid answer to it. Thank you!
*December 2, 2015*

**physics**

A 0.014 kg bullet is fired straight up at a falling wooden block that has a mass of 4.0 kg. The bullet has a speed of 700 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision ...
*November 30, 2015*

**phyics**

Cheryl is riding on the edge of a merry-go-round, 2m from the center, which is rotating with an increasing angular speed. Cheryl’s tangential acceleration is 3.0m/s2. At the instant that Cheryl’s linear speed is 4.0m/s, what is Cheryl’s total acceleration? ...
*November 29, 2015*

**Chemistry**

The intreval volume of a clorimeter was1.12L. A sample of gas of 1.863g of nonae was added, and the closed calorimeter then had added oxygen until the pressure was 10.0atm na dht etemp was 23.1 C.Write the full balanced equation of the combustion of the nonae in the ...
*November 28, 2015*

**Chemistry**

Automotive airbags inflate when sodium azide, NaN3, rapidly decomposes to its constituent elements according to the chemical equation, 2 NaN3 -> 2 Na + 3 N2. How many grams of nitrogen are produced when 1000 milligrams of sodium azide decomposes?
*November 25, 2015*

**differential equations**

Nevermind, I got the answer.
*November 25, 2015*

**differential equations**

Convert x''+ sin(x) = 0 into a first order system of equations. (x'' refers to the second derivative of x). I tried: y1 = sin(x) y2 = x' {y1' = cosx {y2' = -sinx Not sure if I did it right.
*November 25, 2015*

**Algebra**

If you know all the answers please help me. I need help!
*November 24, 2015*

**Algebra**

1. determine whether the equation represents a direct variation , if it does find the constant of the vartion 2y=5x+1
*November 24, 2015*

**Phyics**

The foci of the elliptical path for an Earth satellite are __________. A) one at Earth's center and the other elsewhere B) one atop the other at Earth's center C) both inside Earth D) both outside Earth
*November 21, 2015*

**geometry**

given: -n+6=8n+6n prove:n=0
*November 18, 2015*

**Chemistry**

ok I set up the first one right, and got P=.998 atm The after composition makes sense and I got P = 20.0 atm Are these correct?
*November 18, 2015*

**Chemistry**

Calculate the pressure of 4.80g of ozone, O3, in a 2.45 L flask at 25 degrees C. Assume that the ozone completely decomposes to the molecular oxygen. 2O3(g) --> 3O2(g) Calculate the pressure inside the flask once the reaction is complete.
*November 18, 2015*

**Chemistry (Check)**

correct
*November 18, 2015*

**Chemistry (Check)**

What is the volume of the gas in a balloon at -195 degrees C if the balloon has been filled to a volume of 5.0L at 25 degrees C? Vf = 1.3L
*November 18, 2015*

**Chemistry**

Is it just .8252 kg/cm^3? because multiply 1000cm^3 / 1000kg
*November 18, 2015*

**Chemistry**

Calculate the density of methane gas, CH4, in kilograms per cubic meter at 25 degrees C and 956 mmHg. I got .8252 g/L but am getting confused with the converting units.
*November 18, 2015*

**Chemistry**

Calculate the pressure in an evacuated 250mL container at 0 degrees C when the O2 in 1.00 cm^3 of liquid oxygen evaporates. Liquid oxygen has a density of 1.118 g/cm^3.
*November 17, 2015*

**Science**

Nonmetals are often brittle
*November 17, 2015*

**Biology**

to produce a substance
*November 17, 2015*

**Business**

My apologies. It is the Harvard Business Review, not the Harvard Business Journal.
*November 17, 2015*

**Business**

I have to write a two page paper about a journal article. The article is "Beware the Next Big Thing" published in the Harvard Business Journal, 2014. In the essay I have to include: a. methodology b. objectives c. summary of research results d. managerial ...
*November 17, 2015*

**Math**

It is not a function because there are multiple y-values paired with a single x-value
*November 17, 2015*

**physics**

A cross-country skier who weighs 600 N has chosen ski wax that provides ฯ=0.03. What is the minimum amount of horizontal force,perhaps from a tailwind,that would keep the skier coasting at constant speed across level snow?
*November 16, 2015*