Sunday

August 2, 2015

August 2, 2015

Total # Posts: 83,044

**Science**

Petroleum, Natural Gas, and Coal and Uranium.
*May 22, 2015*

**Science**

What is the most popular non-renewable energy source?
*May 22, 2015*

**Algebra**

So, they way you have it typed, I'd say it's 1^9
*May 22, 2015*

**Algebra**

No, when you divide with exponents, you subtract the exponents. It's the opposite from multiplication, how you add the exponents. When it comes to divide exponents, you subtract the exponents.
*May 22, 2015*

**Math**

If (1 / 49)^ n + 3 = radical (7), then n=? F. - 7 / 4 G. 9 / 4 H. -11 / 4 J. -13 / 4 K. 15 / 4
*May 22, 2015*

**Combinatorics**

Done. It is 229. Thank you.
*May 22, 2015*

**Combinatorics**

How many even integers which are between 1 and 1000 (including 1 and 1000) and relatively prime to 105?
*May 22, 2015*

**Math**

Cone surface area: π(10)(15) = 150π Hemisphere surface area: 2π(10)^2 = 200π 350π is the surface area Cone volume: 1/3π(10)^2(11.2) = 373.3π I got the height by using the pythagorean theorem. Hemisphere volume - 2/3π(10)^3 = 666.7π...
*May 22, 2015*

**Math **

What is the surface area and volume of a composite figure made up of a hemisphere and a cone in terms of pi? The radius is 10, and the slant height is 15. Ans: surface area: 350 pi units^2 volume: 1039.4 pi units^3
*May 22, 2015*

**The Giver**

Which statement provides the best summary of chapter 15? A. Jonas finds the giver in pain and offers to help. B. Jonas experiences tiny pinpricks of snow that touch his body and melt on his tounge. C. The Giver explains to Jonas why the pain and the carnage of war are ...
*May 22, 2015*

**Intro. to Computers**

The command prompt found on Windows 7 and Windows 8 is very similar to the interface of what past operating system?
*May 22, 2015*

**apush**

in the 11828 election there were more _ because property requirements were eliminated .
*May 22, 2015*

**physics**

is differentials used in burger's equation?
*May 22, 2015*

**physics**

is differentials used in burger's equation?
*May 22, 2015*

**ap chem**

Bismuth can be electrolytically reduced according to the following reaction: BiO(+)+ 2H(+)+ 3e¯ >>> Bi + H2O How many grams of bismuth can be reduced by applying a 5.60 A current for 23.8 min. to a solution containing BiO+ ions (assuming 100% efficiency)?
*May 22, 2015*

**AP Chem ---**

i need help with this
*May 22, 2015*

**maths**

Tan 7 theta × tan 3 theta = 1 find the value of theta
*May 22, 2015*

**math**

You roll a number cube numbered one to six 12 times. P(5)=2/3. What type of probability is illustrated and why?
*May 22, 2015*

**is the ph= o for the H+**

thanks
*May 21, 2015*

**is the ph= o for the H+**

-0.24925=log {h+)
*May 21, 2015*

**is the ph= o for the H+**

Calculate the pH of the cathode compartment for the following reaction given Ecell = 3.01 V when [Cr3+] = 0.15 M, [Al3+] = 0.30 M, and [Cr2O72-] = 0.55 M. 2 Al(s) + Cr2O72-(aq) + 14 H+(aq) → 2 Al3+(aq) + 2 Cr3+(aq) + 7 H2O(l)
*May 21, 2015*

**Math**

From a point 120m from the foot of a building, the angles of elevation of the top and bottom of the flagpole are 49 degrees and 46 degrees respectively. Find the height of the flagpole (answer 13.8m) I couldn't get the answer because I thought the question was worded weird...
*May 21, 2015*

**English**

Government control and addiction to technology.
*May 21, 2015*

**English**

What are the worst aspects of the dystopian future in Fahrenheit 451?
*May 21, 2015*

**Physics**

Three charged particles are arranged on corners of a square as shown in the figure below, with charge -Q on both the particle at the upper left corner and the particle on the lower right corner, and charge +2Q on the particle at the lower left corner. (i) What is the direction...
*May 21, 2015*

**science (theory of evolution)**

^^^^ thank you this helps out a lot
*May 21, 2015*

**science (theory of evolution)**

1.What is two pieces of evidence used to support theory of evolution? Do you guys think it would be alright if I said that they observed nature. And also if you guys could help me come up with another example I would REALLY appreciate it!!
*May 21, 2015*

**Math!! (repost) really need help!!**

A cone has a diameter of 24 in. and a height of 10in. What is the volume of s cone? use 3.14 as an approximation.. final answer in tenths - Im stuck between two answers: 94.25 because if I do 3 x 10 to find the volume. I say 3 because the diameter is 24 in., also 8 x 3 equals ...
*May 21, 2015*

**Math**

Thank you !!
*May 21, 2015*

**Math**

"A system of equations can have two answers beside an actual set of coordinates. What are they?" Would the two other answers be graphing and ratio, or ..
*May 21, 2015*

**Math.**

A cone has a diameter of 24 in. and a height of 10in. What is the volume of s cone? use 3.14 as an approximation.. final answer in tenths - Im stuck between two answers: 94.25 because if I do 3 x 10 to find the volume. I say 3 because the diameter is 24 in., also 8 x 3 equals ...
*May 21, 2015*

**Math**

ohh, thank you!
*May 21, 2015*

**Math**

x+3y = 10 & x=2y-5 could someone explain how to do this.
*May 21, 2015*

**Patst**

would this be correct -3squared + ( (5 (8-6) ) / 2 + 45 ) / 5 =9 + ((5x2)/2)+9 -9 + 5 + 9 =23
*May 21, 2015*

**science**

when you turn a television on, you transfer electrical energy into __. choose all that apply. a heat energy b light energy c elastic potential energy d sound energy
*May 21, 2015*

**math**

How much should linda set aside to buy equipment that costs 7,100 in one year the current interest rate is 0.6% annually compounded annually
*May 21, 2015*

**algebra**

would this be correct -3squared + ( (5 (8-6) ) / 2 + 45 ) / 5 =9 + ((5x2)/2)+9 -9 + 5 + 9 =23
*May 21, 2015*

**life orientation**

List and discuss any 4 factors that could thraten or limit the core function of the media
*May 21, 2015*

**life orientation assignment**

List and discuss any four factors that could threaten or limt the core functions of the media
*May 21, 2015*

**math**

How would I show my work for this problem Find the value of the following: -3squared + ( (5 (8-6) ) / 2 + 45 ) / 5
*May 21, 2015*

**Life orintation**

Four factors that could threaten or limit the core functions of the media
*May 21, 2015*

**heath part2**

Nearly ________ movement in the body is the result of muscle contraction.
*May 21, 2015*

**school**

A large pipe can fill a tank 10 minutes faster than it takes a smaller pipe to fill the same tank. Working together, both pipes can fill the tank in 12 minutes. How long would it take the large pipe working alone to fill the tank?
*May 21, 2015*

**History**

Explain the four-step process King outlines for their nonviolent campaign.
*May 21, 2015*

**i need help finding PH**

Calculate the pH of the cathode compartment for the following reaction given Ecell = 3.01 V when [Cr3+] = 0.15 M, [Al3+] = 0.30 M, and [Cr2O72-] = 0.55 M. 2 Al(s) + Cr2O72-(aq) + 14 H+(aq) → 2 Al3+(aq) + 2 Cr3+(aq) + 7 H2O(l)
*May 20, 2015*

**PHYSICS**

The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, ...
*May 20, 2015*

**college chemistry**

does the ph equal 0?
*May 20, 2015*

**college chemistry**

how do you solve for H^14?
*May 20, 2015*

**college chemistry**

i cant get the answer!!
*May 20, 2015*

**college chemistry**

how do you find the ph of H+?
*May 20, 2015*

**college chemistry**

Calculate the pH of the cathode compartment for the following reaction given Ecell = 3.01 V when [Cr3+] = 0.15 M, [Al3+] = 0.30 M, and [Cr2O72-] = 0.55 M. 2 Al(s) + Cr2O72-(aq) + 14 H+(aq) → 2 Al3+(aq) + 2 Cr3+(aq) + 7 H2O(l)
*May 20, 2015*

**college chemistry**

Consider only the species (at standard conditions) Na+, Cl-, Ag+, Ag, Zn++, Zn, Pb in ...? answering the following questions. Give reasons for your answers. a. Which is the strongest oxidizing agent? b. Which is the strongest reducing agent? c. Which species can be oxidized by...
*May 20, 2015*

**ap chemistry**

What volume of H2(g) and O2(g) is produced by electrolyzing water at a current of 4.00 A for 12.0 minutes (assuming ideal conditions)?
*May 20, 2015*

**college chemistry**

predict the order of reduction and which of the following ions will reduce first at the cathode of an electrolytic cell: Ag^(+), Zn^(+2), IO3^(-)?
*May 20, 2015*

**physics**

A plane flies at 20.0m/s ascending at 30 degrees above the horizontal. The plane drops a care package at a height that allows the package to land 750m away (horizontally). 1.) At what location above the ground was the package released? 2.) Find the velocity (magnitude and ...
*May 20, 2015*

**college chemistry**

how many grams of copper can be reduced by applying a 3.00 A current for 16.2 minutes, to a solution containing Cu^(2+) ions?
*May 20, 2015*

**college chemistry**

1. what voltage is necessary to force the following electrolysis reaction to occur? which process would occur at the anode? cathode? assuming the iodine oxidation takes place at a platinumm electrode, what is the direction of electron flow in this cell? 2I^(-)(aq)+Cu^(+2)(aq...
*May 20, 2015*

**Math**

Amanda wants to shorten the wheelchair ramp at her front door. The current ramp is 13 feet along the horizontal and the step is 9 inches high. If she doubles the measure of the angle that the ramp makes with the walkway, how long will the new ramp be to the nearest inch?
*May 20, 2015*

**4th Grade Math**

d:c=5:4 or d/c=5/4 or d=c x 5/4 or d=c*(1 + 1/4)= c+ c/4 But d=153-c then 153-c=c+c/4 or 153=2c+c/4=c*2 1/4= c* 9/4 or c=4/9 * 153=612/9=68 cats=68
*May 20, 2015*

**Trig**

Find sin2theta, cos2theta, and tan2theta for costheta = -12/13 in pi < theta < 3pi/2. My answers: 20111/24336 for tan2theta. 144/169 for cos2theta -120/338 for sin2theta
*May 20, 2015*

**Physics**

you hear the sum, and the difference: 910, and 90hz. And, your hear the original, 410 and 500hz
*May 20, 2015*

**PHYSICS**

The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, ...
*May 20, 2015*

**PHYSICS**

I'm still not getting the right answer for it...
*May 20, 2015*

**PHYSICS**

vaporization takes place while the Hg is above 100C, or 100C+. so until the water heats to 100, no vaporization. HeatGained by water+heatgainedHg=0 .498*cwater*(100-81.6)+4.04*CHg*(Tf-210)=0 so calculate Tfinal for the Hg...note it is not in equilibrium with the water temp... ...
*May 20, 2015*

**physics**

Net force down=friction + weight = -mg*mu*Cos5+mg*sin5 so is the net force > 0?
*May 20, 2015*

**physics **

A skier stands on a 5 degree slope.if the cofficient of static friction is 0.1,does the skier start to slide down?
*May 20, 2015*

**math**

find the discount on proceeds on a 3,270 face value note for 6 months if the discount rate is 9.5 percent
*May 20, 2015*

**Science**

Thank you:)
*May 20, 2015*

**Science**

what happens immediately before a volcano erupts ? a) magma collects in the mantle** b) lava hardens to form volcanic rock c) expanding gases pushes magma through the pipe d) the temperature in the magma chamber decreases
*May 20, 2015*

**chemistry**

3g of a metal (iii) reacts with mercury (ii) chloride to form metal (iii) chloride and mercury (ii) iodide. Identify unknown metal product.
*May 20, 2015*

**physical science**

The force of gravity acting on a body is 675 newtons. find the mass of the body to the nearest kilograms.
*May 20, 2015*

**physical science**

Why is the atmosphere pressure lower on a high mountain peak than at sea level?
*May 20, 2015*

**Trig**

Thanks to both!
*May 20, 2015*

**Trig - My Mistake**

Sorry, I meant, "Which is sin theta/2?"
*May 20, 2015*

**Trig**

For 90<theta<180, cos theta = -(5/13). Which is sin theta? 1. - sqrt 13/9 2. - sqrt 9/13 3. sqrt 9/13 4. sqrt 13/9 3?
*May 20, 2015*

**Trig**

Which is cos2 theta if sin theta = -2/sqrt13 and 180 < theta < 270? 1. -(13/5) 2. -(5/13) 3. 5/13 4. 13/5 3?
*May 20, 2015*

**geometry**

A cone has a volume 320 cm^3. Find the radius of the base. Round your answer ti the nearest 0.1 cm.
*May 20, 2015*

**math**

Question 11. 11. How many lateral edges does a 50-gonal pyramid have? How many lateral faces? (Points : 20)
*May 20, 2015*

**math**

Ten participants are randomly selected from a population of patients with history of heart disease to be tracked in a health study. The study begins with an initial assessment of health status. The participants are instructed to return for a follow up visit one year after the ...
*May 20, 2015*

**science**

the cake is sititing on table with a gravitation force of 57.6 and a normal force of 57.6 what is the sum of all forces
*May 20, 2015*

**physical science**

What is the momentum, in kg-m/s of a 54,000 kg ship going 12 mph?
*May 19, 2015*

**physical science**

How many kilojoules are required to melt 5 lbs of gold if its initial temperature is 1000 K?
*May 19, 2015*

**Math**

13 more than the product of m and 5
*May 19, 2015*

**college chemistry**

How did the change in concentration of the copper ions affect the cell potential? Is this change in agreement (qualitatively) with that which would be predicted by LeChatelier's Principle? explain.
*May 19, 2015*

**Science**

How can using biomass fuels instead of gasoline in car engines help conserve natural resources? a. I makes cars run faster. b. It burns more fossil fuels. c. It reduces the use of coal.<---- d. It uses a renewable resource.
*May 19, 2015*

**science**

Which of the following is the best course of action when it comes to using natural resources? A. Only nonrenewable resources should be carefully managed B. Only renewable resources should be carefully managed C. Conservation should be implemented for both renewable and ...
*May 19, 2015*

**science (any tutor)**

thx
*May 19, 2015*

**science (any tutor)**

NVM I am done and I got a 100% on my quiz!!!!!:):)
*May 19, 2015*

**science (any tutor)**

Which kind of pollution is illustrated by a pipe gushing polluted water into a river? A. Point source*** B. Nonpoint source C. Carbon source D. Resource source
*May 19, 2015*

**Chemistry**

I need help on these last three problems on my Hw. 1. A 10.0 L sample of gas at 3.00 degrees Celsius is cooled at a constant pressure until it reaches 1/2 of its original volume. At what temperature in K will this volume be reached? (Charles law) 2. 994 mLof gas is collected ...
*May 19, 2015*

**Math/Algebra**

Help please. Find the Volume of the cylinder. use 3.14 for pi. Diameter of 34 M height of 27 M
*May 19, 2015*

**chemistry**

thank you
*May 19, 2015*

**chemistry**

1. what would happen to the the cell potential in a voltaic cell if the salt bridge lost contact with one of the solutions? 2. would a reaction occur if solid tin was placed in a solution of copper II nitrate? If so, write the balanced net ionic equation for the reaction.
*May 19, 2015*

**college chemistry**

what was the value for this nernst equation? Another question: How did the change in concentration of the copper ions affect the cell potential? Is this change in agreement (qualitatively) with that which would be predicted by LeChatelier's Principle? explain.
*May 19, 2015*

**college chemistry**

whats the answer for the nernst equation?
*May 19, 2015*

**college chemistry**

the Cu(No3)2 solution was diluted to 0.001 M. The voltage was measured against standard zinc electrode and found to be 0.89 volts.. 1. write the cell reaction. 2. write the line notation for the reaction. 3. Use the nernst equation to calculate what the expected voltage should...
*May 19, 2015*

**theory of evolution**

^^ yea, sorry that was a typo. Thank you for your help!!
*May 19, 2015*

**theory of evolution**

if you guys could check my answers I would be really grateful A species of flowering plant produces vibrant blue flowers. The flowers attract both pollinators that spread the plant's pollen and herbivores that feed on the plant. An adaptation occurred through several ...
*May 19, 2015*

**Quadratic Functions and Calculus**

I have used the three data point which is given in part A of the question. the three input was $10000 in week 0 in week three it is $2025 and the 6th week it is 64% of the initial investment. I have also put the last digit of my student ID which is an integer power of 2 which ...
*May 19, 2015*

**Phyics**

Why does the emission spectrum of an element consist of discrete wavelengths
*May 19, 2015*