Saturday

July 4, 2015

July 4, 2015

Total # Posts: 316

**Science**

A 13.0 kg block of concrete rests on a 5 cm by 2 cm board. What is the acceleration of the block of concrete here on Earth?
*June 3, 2015*

**Science**

A spherical object made of stone is dropped into a container of water and sinks to the bottoms of the container causing 30N of water to spill out. What is the estimated gravitational force of the object?
*May 23, 2015*

**Science**

A 13.0 kg block of concrete rests on a 5 cm by 2 cm board. What is the acceleration of the block of concrete here on Earth?
*May 22, 2015*

**Math Please Help**

Eliminate the parameter and sketch the curve. x=cos(theta) , y=cos^2(theta) + 8cos(theta)
*May 20, 2015*

**Math**

Remove the xy-term by rotation of axes, reduce the resulting equation to standard form and trace the curve on the new axes: 13x^2-10xy+13y^2=72
*May 18, 2015*

**geometry**

What is the cross section of a cylinder if it's cut perpendicular to the base? It's either a rectangle or a circle but I'm not sure.
*May 13, 2015*

**chemistry**

Can aluminum (Al) react with K2SO4 by single replacement to yield products? Using the activity series chart, I know that K is more reactive than Al so does that mean that a reaction will occur or not?
*April 27, 2015*

**math**

Chad has a rope that is 9 yards long. How many pieces of rope measuring of a yard can he divide his rope into?
*April 19, 2015*

**Chemistry **

Is PbI2 soluble in water or not? Following the solubility rules for ionic compounds, salts containing Pb are insoluble and iodide salts are soluble, so can it be both?
*April 17, 2015*

**algebra**

I solved for y and got y = ±√(x+4) for the inverse, the given equation was y=x^2-4 not y = x^2 + 4 but your explanation helped understand why the inverse is not a function, thank you!
*March 31, 2015*

**algebra**

State if the inverse of y=x^2-4 is a function. So, I got y= squareroot of x+4 I'm don't think it's a function because of even roots, but I'm not sure
*March 31, 2015*

**spanish**

I appreciate that, thank you
*March 29, 2015*

**spanish**

In the sentence:"Hay muchas historias sobre dónde y cuándo Piña coladas fueron encontrar," is fueron correct? or do I use eran instead?
*March 29, 2015*

**chemistry**

I'm adding these three atomic weights (40.1+12.0+48.0) together, and I got 100.1 How can I round my answer to three significant figures? thank you!
*March 21, 2015*

**Computer Science**

You try to run the CHKDSK utility from a command prompt but you keep getting an error message that you need to run it in Elevated Mode. How do you correct this? Reboot the computer in SAFE Mode and then run CHKDSK from a command prompt. Open command prompt from the Windows ...
*March 12, 2015*

**Factories**

What are some working conditions in factories today? Please help Thank you:)
*March 12, 2015*

**chemistry**

that makes sense, thank you!
*March 11, 2015*

**chemistry**

how many molecules are in 5.5 moles of oxygen gas? How many atoms are in this quantity of gas? I used dimensional analysis and did: 5.5 mol. of oxygen x 6.02x10^23 molecules/1 mol of oxygen I got 3.3x^24 molecules of oxygen How do I find the # of atoms? I know that there are 2...
*March 11, 2015*

**Math**

18 students in a class play baseball. 17 students in the class play basketball. 30 students in the class play either or both sports. Select the vend diagram that shows the number of students who play basketball and baseball. A. Baseball 13 (5) 12 basketball B. Baseball 13 (6) ...
*March 10, 2015*

**English- AP Lit**

Thank you!
*March 9, 2015*

**English- AP Lit**

My class is doing an essay on dracula and I need help with a thesis statement. This is the topic I chose: Issue of Trust & Sharing of Knowledge-Is there ever a time when it is better to be kept/keep others in ignorance? How does this connect to the idea of establishing and ...
*March 9, 2015*

**Chemistry**

Thank you DrBob222 for your help I get it now!
*March 9, 2015*

**Chemistry**

Is there anyway you could explain further?
*March 9, 2015*

**Chemistry**

What volume of oxygen gas is needed to react completely with 0.677 L of carbon monoxide gas (CO) to form gaseous carbon dioxide? Assume all volume measurements are made at the same temperature and pressure. Thanks in advance for all help!!
*March 9, 2015*

**Algebra**

For your first question the answer is... 15,16.5,18,19.5 because the first number is 15 and you can add 1.5 to each of the values to get the next value. For your second question the answer is either the top or the bottom depending on how you are using the ratio.
*March 9, 2015*

**chemistry**

What volume of oxygen gas can be collected at 1.26 atm pressure and 2.00◦C when 39.7 g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆/MnO2 −−−−→ 2 KCl(s) + 3 O2(g) Answer in units of L.
*March 9, 2015*

**Art**

B?
*March 9, 2015*

**Art**

1. Realists reacted to the industrial revolution by creating what types of paintings? A. Images of the wealthy B. Images of the middle class C. Images of soldiers D. Images of despair D?
*March 9, 2015*

**Art**

Valley of the shadow of death by Roget Fenton 1. How does roger Fenton use visual composition in valley of the shadow of death to depict the loss of war? A. Cannonballs in a barren landscape hint at powerful destruction B. Cannonballs are a reminder of a victorious battle C. ...
*March 9, 2015*

**ela**

okay, how do I know where to put commas?
*March 5, 2015*

**ela**

I have to write a sentence with a polysyndenton sentence structure; is this an example of one? ex: I was stressed because the teacher inundated me with many projects and homework and classwork and materials
*March 5, 2015*

**math**

At a school camp, 30% of the students were boys. When 87 students left the camp after the second day, half the original number of boys were left behind, and the number of girls decreased by 20%. How many girls were at the camp in the beginning?
*March 5, 2015*

**Introduction to Computers**

What is a limiting factor of EFS when compared to BitLocker?
*February 23, 2015*

**spanish**

replace the underlined objects with the correct object pronoun . be sure to use se when it is required 1/ ayer mi mama compro un lapiz para mi
*February 15, 2015*

**Math**

What is an equation of the line, in point-slope form, that passes through the given point and has the given slope? a. y-9=4/9(x+3) b. y-9+4/9(x-3) c. y+3=4/9(x-9) d. y-3=4/9(x-9)
*January 21, 2015*

**Math**

The function f(x)=x^2. The graph of g(x) is f(x) translated to the right 3 units and down 3 units. What is the function rule for g(x)? I honestly have no idea how to this… An example or helping me get through the problem would be great :) Thank you so much :)
*January 19, 2015*

**Math**

Matthew used 1/5 of a box of flour for cooking and ¾ of the remainder to make bread. The rest of the flour was packed equally into 5 containers. What fraction of the total amount of flour was in each container?
*January 15, 2015*

**English**

ohhh that makes so much more sense!!!
*January 15, 2015*

**English**

For number 1 I can select all of them… and number 2 thats what I thought… would it be b?
*January 15, 2015*

**English **

I have two questions for english that I honestly don't know… I put what I think it is but I think its completely wrong… 1. Which of the following is a possible setting for works of American literary realism? Check all that apply. a. American West* b. post-Civil ...
*January 15, 2015*

**Physics**

A 0.340 kg block on a vertical spring with a spring constant of 4.09 × 103 N/m is pushed downward, compressing the spring 0.0700 m. When released, the block leaves the spring and travels upward vertically. The acceleration of gravity is 9.81 m/s2 . How high does it rise ...
*December 10, 2014*

**Chemistry**

Hi: Thank you for helping me. I realized this after posting. I found that Hf is 5.7kj/mol and I know that the Hf known is 6.02kj/mol. 316.43*.001*18.02=5.70kj/mol I found that 5.70/6.02= 94.7% <--Can you check if I did this correctly?
*November 19, 2014*

**Chemistry**

UPDATE: I got 352.49J/g. I need help figuring Hf in (kj/mol).
*November 19, 2014*

**Chemistry**

I need help calculating Heat of fusion for a calorimeter experiment: I know that Q(melt): 8350.46 J, m(ice): 26.39g and m(hot water): 51.93g. Please help me set it up. Hf known is 6.02kj/mol. Answer is in J/g(ice).
*November 19, 2014*

**science**

I dropped marbles down from the same height for an experiment, but why don't they land in the same location?
*November 13, 2014*

**Spanish**

I want to say, I liked reuniting with my relatives, is it "me gustó reunirme con mis parientes" or is it "...reunirse con mis parientes"?
*November 11, 2014*

**Spanish **

How do I say, "I learned to bargain?" Is this correct, yo aprendí regatear?
*November 10, 2014*

**math**

where is the 36 from?
*October 18, 2014*

**math**

Question: Two physics students built a model rocket for a class project. Once the rocket is launched, its height in feet, h(t), can be found using the height function h(t) = -16t² + 96t where t represents time in seconds.Find the time when the rocket finally hits the ...
*October 18, 2014*

**math**

I'm wonder if im correct? Two physics students built a model rocket for a class project. Once the rocket is launched, its height in feet, h(t), can be found using the height function h(t) = -16t² + 96t where t represents time in seconds my work: 0=-16t^2+96t = -16t(t-...
*October 18, 2014*

**Math **

Is this right? 0 > -2
*September 10, 2014*

**Science**

A classmate states that igneous rock must always become a sedimentary rock next, according to the rock cycle. Explain why this is not correct.
*September 9, 2014*

**Math**

Ok so... -4 (2 +8) = (-4 • 2) + (-4 •N) What would N be?
*September 7, 2014*

**Engineering**

Phase diagram for soil Mechanics?
*August 29, 2014*

**Chemistry**

KNO3 solubility at 80 C is 180g/100g KNO3 solubility at 50 C is 78g/100g
*July 28, 2014*

**Chemistry**

100g of a saturated solution of KNO3 was cooled from 80 degrees to 50 degrees. What mass of KNO3 would be expected to crystallise out of the solution?
*July 28, 2014*

**statistics**

A graph representing the distribution of the oral temperatures of 50 healthy adult males (selected at random) would best be described as?
*June 15, 2014*

**Calculus**

In First principles there is usually a part that states as lim approaches 0. Now I came across a question where the limit was as 1 approaches 3. what should I do?
*May 20, 2014*

**Calculus**

A circular oilspill is spreading such that the radius is increasing at 0.5 metres per minute. Find the rate of increase of the are of the oil spill when the radius is 10m.
*May 20, 2014*

**Calculus**

a meteorite slams into the earths crust and penetrates d=(1200t-36000t^2)m in t seconds after impact. What is the maximum depth of penetration?
*May 20, 2014*

**Calculus**

a rectangular storage area is to be constructed along the sides of a tall building. A security fence is required along the three remaining sides of the area. What is the maximum area that can be enclosed with 1000m fencing?
*May 20, 2014*

**Calculus 1**

Ok thanks I don't quite get it but I will follow your steps and Draw the diagram :)
*May 20, 2014*

**Calculus 1**

@ Steve I don't completely understand I want to knowhow we got to that answer/
*May 20, 2014*

**Calculus 1**

a rectangular storage area is to be constructed along the sides of a tall building. A security fence is required along the three remaining sides of the area. What is the maximum area that can be enclosed with 1000m fencing?
*May 20, 2014*

**precalculus**

How many solutions will the following systems of equations have? x^2+y^2=10 x+y=4 a. infinite b. 0 c. 1 d. 2 I'm thinking A. but I just want to make sure. If you have an answer that is different could you possibly show me how you got it, it would really help me prepare for...
*May 14, 2014*

**math**

(0,0); m=2
*April 25, 2014*

**Chemistry**

A 0.160-g sample of unknown metal (X) reacts with hydrochloric acid to produce 66.5 mL of "wet" gas at 20 °C and 754 mm Hg. What is the unknown metal (X)? (The vapor pressure of water at 20 °C is 18 mm Hg. Help please?
*April 23, 2014*

**chemistry**

Helpful steps? Calculate the predicted atomic radius for potassium, K, given the atomic radius of rubidium, Rb, (0.247 nm) and cesium, Cs, (0.265 nm).
*April 23, 2014*

**Chemistry**

Help please: A 0.199-g sample of unknown metal (X) reacts with hydrochloric acid to produce 88.5 mL of "wet" gas at 20 °C and 754 mm Hg. What is the unknown metal (X)? (The vapor pressure of water at 20 °C is 18 mm Hg.) X(s) + 2 HCl(aq) → XCl2(aq) + H2(...
*April 17, 2014*

**Chemistry**

How many nonbonding electron pairs are in an oxygen molecule? I drew it but im unsure if Im correct in saying it has 2 nonbonding electron pairs.
*April 17, 2014*

**Chemistry**

corrections for the data 1.00 atm 150 mL 1.15 atm 130 mL 1.36 atm 110 mL 1.67 atm 90 mL 2.14 atm 70 mL 3.00 atm 50 mL
*April 17, 2014*

**Chemistry**

How would I graph this: (I dont understand the whole with [1/volume] (units=1/mL) on the X-axis ) According to Boyle's Law, pressure is inversely proportional to volume, so prepare a graph of the data, with [1/volume] (units=1/mL) on the X-axis and pressure (atm) on the Y-...
*April 17, 2014*

**chemistry**

A sample of hydrogen chloride gas occupies 0.550L at STP. What is the pressure in atm if the volume is 7.50×10−2L at 20∘C?
*April 14, 2014*

**Science Help PLEASE!!**

I only need #1 now. . .
*March 11, 2014*

**Science Help PLEASE!!**

1. What happens to the levels of surface water and groundwater during a drought? Surface water and groundwater levels increase during drought. Surface water and groundwater levels decrease during drought. There is no change in the levels of surface water and groundwater during...
*March 11, 2014*

**science**

Carbon dioxide is obtained from the air and changed into carbohydrates and oxygen during the process of A) fossilization. B) respiration. C) digestion. D) photosynthesis
*January 29, 2014*

**Geometry**

cccc
*January 23, 2014*

**Science**

23. is invasive
*January 13, 2014*

**History**

How did issues regarding African Americans equality shaped US 1850-1920?
*December 8, 2013*

**Rounding**

37,400?
*November 3, 2013*

**Rounding**

Would the answer be 37,000 then? I under stand the concept with small numbers, but the big number is confusing me.
*November 3, 2013*

**Rounding**

I was doing a math question and I got the answer "$37,482.43" but the question says to round to the nearest dollar. What would the answer be then?
*November 3, 2013*

**world history**

Which of the following is not something Napoleon did to help France wage war and win territory? A. He relied on the mandatory military service of French citizen-soldiers. B. He improved schools and the postal service. C. He raised soldiers from conquered territories. D. He ...
*November 1, 2013*

**world history**

Which of the following is not something Napoleon did to help France wage war and win territory? A. He relied on the mandatory military service of French citizen-soldiers. B. He improved schools and the postal service. C. He raised soldiers from conquered territories. D. He ...
*November 1, 2013*

**world history**

Which of the following is not something Napoleon did to help France wage war and win territory? A. He relied on the mandatory military service of French citizen-soldiers. B. He improved schools and the postal service. C. He raised soldiers from conquered territories. D. He ...
*November 1, 2013*

**Statistics**

How did you find the 3.169, please?
*October 29, 2013*

**English**

'Self-portrait'. Describe yourself. In your description you should try to capture what makes you unique. Write about 350-500 words.
*October 29, 2013*

**Math**

S(t) = 0.05t^3 + 0.3t^2 + 2t + 8 Find S'(t)
*October 13, 2013*

**Accounting - Writing **

UOIT has recently appointed you to prepare an independent consulting report to analyze the university’s current financial position and to provide some recommendations for improvement. Before you begin your analysis, you decide to identify UOIT’s various stakeholders...
*October 2, 2013*

**ap chem**

If 26.0mL of AgNO 3 is needed to precipitate all the Cl −ions in a 0.750-mg sample of KCl (forming AgCl), what is the molarity of the AgNO 3 solution
*September 29, 2013*

**ap chem**

What volume of 0.140 M HCl is needed to neutralize 2.53g of Mg(OH)
*September 29, 2013*

**Math**

What is the inequality sign for the word about? For example, Sally had about 10 apples.
*September 29, 2013*

**Math**

An investment broker wants to invest up to $20,000. She can purchase a type A bond yielding a 10% return on the amount invested, and she can purchase a type B bond yielding a 15% return on the amount invested. She wants to invest at least as much in the type A bond as in the ...
*September 28, 2013*

**Math**

A factory manufactures two products, each requiring the use of three machines. The first machine can be used at most 70 hours; the second machine at most 40 hours; and the third machine at most 90 hours. The first product requires 2 hours on machine 1, 1 hour on machine 2, and...
*September 27, 2013*

**Math**

The equation I would use is C = 12a + 16b. Does that seem alright? And how would I form the contraints?
*September 27, 2013*

**Math**

An appliance company has a warehouse and two terminals. To minimize shipping costs, the manager must decide how many appliances should be shipped to each terminal. There is a total supply of 1200 units in the warehouse and a demand for 400 units in terminal A and 500 units in ...
*September 27, 2013*

**Math - Functions**

Is max profit 80 than? I am plugging it back into P(x) = = 50x - 1.25x^2 - 160 - 10x right?
*September 24, 2013*

**Math - Functions**

The research department in a company that manufactures AM/FM clock radios established the following cost, and revenue functions: R(x) = x(50-1.25x) C(x) = 160 + 10x where 0 < x < 20. a) Determine when R = C (to the nearest thousand units. e.g. 6.247) Quantity x = ...
*September 24, 2013*

**Math**

By the way, "blank" is where the answer is supposed to be.
*September 23, 2013*

**Math**

The research department in a company that manufactures AM/FM clock radios established the following cost, and revenue functions: R(x) = x(50-1.25x) C(x) = 160 + 10x where 0 < x < 20. a) Determine when R = C (to the nearest thousand units. e.g. 6.247) Quantity x = Blank 1...
*September 23, 2013*