Saturday

September 20, 2014

September 20, 2014

Total # Posts: 236

**chemistry**

An ore contains Fe3O4 and no other iron. The iron in a 65.46 gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 37.9 grams. What was the percent Fe3O4 in the sample of ore? Answer in units of %
*September 7, 2014*

**Math**

x =2(y+3) or y=3+1/2x
*September 4, 2014*

**chemistry**

At what angle (in degrees) must {111} planes of platinum (Pt) be exposed to a collimated beam of thee X-rays in order to obtain by diffraction monochromatic CrKα radiation.
*August 26, 2014*

**chemistry**

Gallium Arsenide ---------------- The charge carrier density of GaAs at 31o C is 2.25x106 cm-3. What is the charge carrier density (in cm-3) at 175oC? (The bandgap of GaAs is 1.42 eV. ) I am trying with arrhenius relationship but get confused over "charge carrier density&...
*August 25, 2014*

**chemistry**

Gallium Arsenide ---------------- The charge carrier density of GaAs at 31o C is 2.25x106 cm-3. What is the charge carrier density (in cm-3) at 175oC? (The bandgap of GaAs is 1.42 eV. )
*August 25, 2014*

**math**

Kendra bought 4 paintings and wants to hang them side by side on a wall in her bedroom. However, only 3 of the paintings will fit side by side on this wall. How many different ways can Kendra arrange 3 of the 4 paintings on the wall?
*July 31, 2014*

**Practical english**

Which of the following sentences contains an indefinite pronoun? A. This is Mary's necklace.
*May 1, 2014*

**English **

Hello I need some ideas to elaborate on in an essay about the following question "1.According to Frankenstein what makes the Creature more “human,” his weaknesses or his strengths?Why?" Now I believe it is his weaknesses but i dont know what Victor ...
*February 16, 2014*

**Beacon Height**

what is the time for the first clock
*January 9, 2014*

**EARTH SCIENCE**

number one is absolutly D i had gotten that one right.
*January 7, 2014*

**Lit**

What is a basic draft for a claim (Toulmin) about the theme. For example, "The theme of the piece is "blah-blah" " doesn't have an argument. What does?
*December 15, 2013*

**Math**

50 x 50 x 50 x 50
*December 15, 2013*

**maths lite,life science,geography and tourism**

What career can I take
*October 3, 2013*

**Grammar Advisor**

Are these correct? I mark my answer with an X. 88. The reason to list all of the preliminary (non-procedural) information in a lesson plan is to be sure have considered each aspect. keep good records for your future needs. be able to communicate clearly with administrators, ...
*September 25, 2013*

**Grammar Advisor**

I just cannot figure out if these answers are correct or not. Can you please help me? 78. If the sound system hadn’t failed, last night’s show would have been better. This is a correct sentence using the 1st conditional form. x This is a correct sentence using the ...
*September 25, 2013*

**math**

what are the 5 number combo in 1 to 39
*September 8, 2013*

**Science**

Which of the following is an environmental concern of genetically engineered crops mentioned in your text? (Points : 1) Genetically modified crops lead to larger applications of toxic herbicides and insecticides. The genetic modification of crops increases soil erosion while ...
*August 21, 2013*

**math**

Joan receives an annual salary of $22,768.68. What is the total amount of her gross pay each period if she is paid monthly?
*August 14, 2013*

**math**

Erma is paid $516.72 biweekly. What are her annual earnings?
*August 14, 2013*

**math**

Sheila received a 6.5% commission on a house she sold for $110,400. How much commission did she receive?
*August 14, 2013*

**american history**

Under the _______ system, Spanish conquistadors were rewarded with local villages and control over the local labor force
*July 15, 2013*

**math **

Explain whether the following statement is true or false: “The ordered pair (1,5) is the same as the order pair (5,1).”
*July 2, 2013*

**Math**

can any one add or subtact this (m^2 - m - 4) + (m - 5)
*June 5, 2013*

**Combining Inequalities**

Some treasure has been buried at a point(x,y)on the grid, where x and y are whole numbers. Here are three clues to help you to find the treasure: Clue 1:x>2 Clue 2:x+y<8 Clue 3: 2y-x>0
*May 23, 2013*

**Science**

Which of the following is true about an object that floats in water? (1 point) The object is less dense than frozen water. The mass of the object is less than that of water. The density of the object is less than that of water. The volume of the water is greater than the ...
*April 19, 2013*

**math**

the floor area of a rectangular storm shelter is 65 square meters, and its length is 6.5 meteres. What is the width of the storm shelter
*January 23, 2013*

**Physical Science**

An exercise spring has a spring constant of 315 N/m. How much work is required to stretch the spring 30 cm? What force is needed to stretch the spring 30 cm?
*December 19, 2012*

**8th Grade Science**

Label these reactants and products: 3Fe + 2 O2> Fe3O4
*December 11, 2012*

**math**

thank you!
*October 30, 2012*

**math**

I am moving to a new house. My old house is 3 kilometers from my new house. How many meters is the old house from the new house?
*October 30, 2012*

**Psychology**

Sources of stress do not automatically cause stress-related problems. Moderators of stress, which can include our personal strengths, might mean that we can have a healthier and more productive life in spite of life's challenges, or maybe even because of them. As the text ...
*October 28, 2012*

**4 gr**

thank u :)
*September 27, 2012*

**4 gr**

forty people are lined up to ride the ski lift to the top of the mountain. Each chair on the holds 3 people. How many chairs will it take to get everyone up the mountain?
*September 27, 2012*

**arrays**

One band has fewer than 40 speakers. They stack them in a array exactly 9 high. How many speakers could they have? Explain how you know.
*September 20, 2012*

**arrays**

Another band has 48 speakers. They stack them at least 4 high, but no taller than 6 high. What are all the different arrays they can make?
*September 20, 2012*

**arrays**

One band has 30 speakers. They stack them at least 3 high, but no taller than 6 high. What are all the different arrays they could make?
*September 20, 2012*

**arrays**

thank u :)
*September 20, 2012*

**arrays**

Rock bands often stack their speakers in an array. One teen band has 24 speakers. They stack them at least 2 high, but no taller than 8 high. What are all the different arrays they can make.
*September 20, 2012*

**arrays**

another band has 48 speakers. they stack them at 4 high, but no taller than 6 high. what are all the different arrays they can make?
*September 20, 2012*

**arrays**

another band has 30 speakers. they stack them at least 4 high, but no taller than 6 high. what are all the different arrays they could make?
*September 20, 2012*

**social studies**

Which of the following best describes the difference between a keyword and subject search? Please make selection! A keyword search uses subject headings, but a subject search does not A subject search can retrieve false hits, but a keyword search does not A subject search uses...
*August 21, 2012*

**vocabulary**

The ----------- definition of gloomy is dismal or depressing.
*June 18, 2012*

**Probability**

In a raffle there are four winning tickets from 12, What is the probability from six tickets there are two winners? Thank you in advance.
*May 12, 2012*

**LIfe orientation**

Identify and descriibe one environmental problem that causes ill health
*April 27, 2012*

**Life Orientation**

Describe one environmental problem that causes ill health,accidents,crises and disasters
*April 25, 2012*

**chemisttry**

how many ml of a 1 M NaOH solution do you need to add to a 250 ml flask and bring it to volume with deionized water to make a 0.12 M NaOH solution
*April 23, 2012*

**physics**

A piece of metal at 80 degrees celsius is placed in 1.2 L of water at 72 degrees celsius. The system is thermally isolated and reaches a final temperature of 75 degrees celsius. Estimate the approximate change in entrophy for this process.
*April 19, 2012*

**physics**

Explain how the specific heats of materials are measured using the technique of calorimetry.
*April 19, 2012*

**physics**

Heat is added to an ideal gas at 20 degrees Celsius. If the internal energy of the gas increases by a factor of three during this process, what is the final temperature?
*April 19, 2012*

**Finance**

The target capital structure for QM Industries is 39% common stock 6% is preferred stock, and 55% debt. If the costs of common equity for the firm is 18.2%, and the cost of preferred stock is 9.4%, the before tax cost of debt is 7.5%, and the firms tax rate is 35% what is QM&#...
*April 18, 2012*

**Math**

One bag contains 2 green marbles and 4 white marbles and a second bag contains 3 green marbles and 1 white marble. If Jon randomly draws one marble from each bag what is the probability that they are both green?
*April 15, 2012*

**Physics**

At a city park, a person throws some bread into a duck pond. Two 4.00-kg ducks and a 9.00-kg goose paddle rapidly toward the bread, as shown in our sketch (Intro 1 figure) . If the ducks swim at 1.10 m/s, and the goose swims with a speed of 1.30 m/s, the total momentum of the ...
*March 25, 2012*

**calculus**

The circumference of a sphere was measured to be 74 cm with a possible error of 0.5 cm. (a) Use differentials to estimate the maximum error in the calculated surface area. (Round your answer to the nearest integer.) cm2 What is the relative error? (Round your answer to three ...
*March 18, 2012*

**Math**

Find the value of constant n if the lines y=(n-2)x+12 and 3x-4y+5=0 are: a) parallel and b) perpendicular to each other. Thanks in advance.
*March 3, 2012*

**Basic Math**

How do you solve: 5/30 + 3/40 + 1/8
*February 27, 2012*

**physics**

A diver has a mass of 75 kg takes part in a competition by having to perform 10 dives off the 10m platform above the water. Before he takes part he snacks on an energy bar (150 g) which provides 15 kj of energy. How many would the diver need to consume to meet the necessary ...
*February 20, 2012*

**Math**

Thank you so much Reiny =]
*February 11, 2012*

**Finance**

Winnebagel Corp. currently sells 33,000 motor homes per year at $49,500 each, and 13,200 luxury motor coaches per year at $93,500 each. The company wants to introduce a new portable camper to fill out its product line; it hopes to sell 23,100 of these campers per year at $13,...
*February 4, 2012*

**chemistry**

For which salt in each of the following groups will the solubility depend on pH? Pb(OH)2 PbCl2
*December 4, 2011*

**chemistry**

How many moles of carbon tetrahydride are needed to produce 3.59 moles of water
*December 4, 2011*

**math**

find 45 of 60
*December 1, 2011*

**math**

How you can use a hundred chart to subtract 12 from 46
*December 1, 2011*

**programming**

creat a logic for a program that continuously prompts the user for a numeric number of dollars until the user enters 0. pass each entered amount to a conversion method that displays breakdown of the passed amount into the fewest bills
*November 17, 2011*

**chemistry**

The combustion of 0.1619 g benzoic acid increases the temperature of a bomb calorimeter by 2.77°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) kJ/°C A 0.1510 g sample of vanillin (C8H8O3) is then ...
*November 13, 2011*

**chemistry**

Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ΔH = -81.5 kJ A 13.0 g sample of CaCl2 is dissolved in 134 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and ...
*November 13, 2011*

**Math**

What is the next number in the sequence 270, 27, 2.7,0.27
*October 27, 2011*

**Physics**

A car can slow down at 5.10 m/s2 without skidding when coming to rest on a level road. What would its acceleration be if the road were inclined at 12o uphill? [Ask yourself – What is the same about the situation on the level road and on the incline?]
*October 4, 2011*

**phusics**

A car can slow down at 5.10 m/s2 without skidding when coming to rest on a level road. What would its acceleration be if the road were inclined at 12o uphill?
*October 4, 2011*

**math**

find the product or quotient. write the strategy you used, write model, break apart, multiplication table, inverse operations, pattern, or doubles
*September 25, 2011*

**college physics**

A 4.5 cm long insect is perpendicular to the optical axis of a thin lens; the bug is 5.4 cm away from the lens. The lens forms an inverted image of the insect which is 0.9 cm long on a screen behind the lens. a. How far behind the lens is the screen? b. What is the lens' ...
*September 17, 2011*

**college physics**

I know you need to use geometry but i don't know how a room which is h = 9.0 feet tall and r = 12.0 feet wide. Attached to the ceiling is a piece of glass (with unknown index of refraction) which is 2.5 feet thick. A laser pointer in the bottom left corner is aimed so that...
*September 13, 2011*

**math**

What is the value of the underline digit 6 in 4,600,028
*August 31, 2011*

**4th grade math**

what is the value of the underline digit 6.... 4,600,028
*August 30, 2011*

**physics**

true or false only animals undergo respiration
*May 16, 2011*

**chem**

which of these are strong electrolytes, weak electrolytes and non electrolytes. H2SO4 FeCl2 HClO AgCl I put AgCl as a non H2So4 and HCl as strong FeCl2 as weak but the computer told me my answer is wrong Can some one help please?
*May 8, 2011*

**Chemistry**

100 grams of glucose is mixed with 500 grams of water. 10 grams of yeast is then added to the mixture. If the reaction goes to completion, what is the mass of ethanol in the final mixture?
*April 28, 2011*

**com**

Is the below paragraph and evaluation? Hockenbury and Hockenbury present important information and raise some interesting questions about how daily hassles affect our lives. In a few paragraphs, they present a great deal of information on the subject of daily hassles — ...
*April 20, 2011*

**College Help**

I am a Sophomore in High School. I have a GPA of 3.3 currently, (it's very bad) with no AP classes taken until Junior and Senior year. What are my chances of getting into UC Irvine? That's the school I really want to get into!
*April 16, 2011*

**Com**

Could you please tell me if the first sentence in each paragraph are topic sentences. The higher the interest rate of credit cards, mortgage or vehicles, the less cash we have in our pockets. When the interest rate of savings is higher that means more money in your pocket. If ...
*April 12, 2011*

**Math**

Just to clarify, 18/2= 9 therefore its in position 9 and 10? then add up and divided by two again? This is only for an even number of data right?
*April 5, 2011*

**Math**

The following data represent what 18 people said when they were asked to estimate the crowd at a public gathering: 325 450 500 500 550 575 575 600 600 650 650 700 700 700 725 750 800 900 State the mean, mode, median Mean: 325+450+500+500+550+575+575+600+ 600+650+650+700+700+...
*April 5, 2011*

**Math**

Two similar triangles. 1) 5.8m, 5m long,3m high 2)?m, 28m long, 16.8m high. Find the length of VR, the direct distance of the river, to the nearest tenth.
*April 3, 2011*

**Math**

Find the length of VR, the direct distance across the river, to the nearest tenth.
*April 3, 2011*

**religion**

The Middle East is the spiritual homeland for all of the following world religions EXCEPT
*April 2, 2011*

**7th gr. Algebra **

what is the meaning of a relative frequency of 1?
*March 22, 2011*

**Physics**

A car moves with a speed v on a horizontal circular highway turn of radius is R = 100. Assume the height of the car’s center of mass above the ground is h = 1 m, and the separation between its inner and outer wheels (car's width) is w = 2 m. The car does not skid (...
*March 20, 2011*

**algebra**

Which of the following are liner? Explain a) y + -2/3x b) y=1/x c) y=x(to the second power)+8x+15
*March 17, 2011*

**geometry**

a block prism has a volume of 36 cubic units, what is the least and greatest surface area it could have
*March 2, 2011*

**Math - Calculus**

Show that the equation x^3-15x+c=0 has at most one root in the interval [-2,2].
*February 28, 2011*

**Math - Calculus**

Show that the equation x^3-15x+c=0 has at most one root in the interval [-2,2]. Perhaps Rolle's Theorem, Mean Value Theorem, or Intermediate Value Theorem hold clues? ...Other than simply using my TI-84, I have no idea how to accomplish this.
*February 28, 2011*

**Math - Calculus**

Show that the equation x^3-15x+c=0 has at most one root in the interval [-2,2]. Perhaps Rolle's Theorem, Mean Value Theorem, or Intermediate Value Theorem hold clues? ...Other than simply using my TI-84, I have no idea how to accomplish this.
*February 28, 2011*

**Physics Craziness**

A big olive (m = 0.40 kg) lies at the origin of an xy coordinate system, and a big Brazil nut (M = 1.2 kg) lies at the point (1.0,2.0) m. At t = 0, a force o = (2.0 + 3.0) N begins to act on the olive, and a force n = (-3.0 - 2.0) N begins to act on the nut. In unit-vector ...
*February 28, 2011*

**Physics**

so for part b: d*sin(theta)=m*λ when you plug in the d from part a and λ and 90 degree for theta(maximum theta). you get m=6.8. This is for one side of the slit. You must subtract the missing fringes, 4 th one. you get m=5. m=10 for both side of the screen and add ...
*February 28, 2011*

**Physics**

A 91 kg man lying on a surface of negligible friction shoves a 75 g stone away from himself, giving it a speed of 4.0 m/s. What speed does the man acquire as a result?
*February 26, 2011*

**Physics**

Left over from the big-bang beginning of the universe, tiny black holes might still wander through the universe. If one with a mass of 3.5 1011 kg (and a radius of only 1.0 10-14 m) reached Earth, at what distance from your head would its gravitational pull on you match that ...
*February 19, 2011*

**Basic Math**

what is 5/30 + 3/40 + 1/8
*February 14, 2011*

**math**

Olivia picked 2.5 kilograms of cherries. She divided the cherries evenly among 10 small baskets. How much did each basket hold?
*February 10, 2011*

**spelling**

Can I replace the word to with from in the following sentence: Laura often lost her homework on the way to school.
*January 26, 2011*

**Physics- Angular Momentum**

Hi Miki! I think we are taking the same physics class... I'd like to possibly share insights about the material and possibly help each other out in a mutually beneficial way. If you are interested, shoot me an email at William dot Cordoba at yaho dot com Thanks William
*December 28, 2010*

**math**

What two numbers have a product of 3.6 and a sum of 3.8?
*December 13, 2010*