Saturday

February 25, 2017
Total # Posts: 58

**Physics**

A 0.50-kg mass is placed on the end of a vertical spring that has a spring constant of 75 N/m and eased down into its equilibrium position. (a) Determine the change in spring (elastic) potential energy of the system. PEs=1/2kx^2=1/2(75)(0.5)^2=9.375 (b) Determine the system&#...

*December 14, 2016*

**2nd grade math**

My number has 1 hundred and 1 thousand. It has double the number of tens as ones. What could my number be?

*October 17, 2016*

**physics**

A stone is tied to a string (length = 0.945 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the maximum tension in ...

*October 8, 2016*

**chemistry**

Rank the following species according to the increasing energy needed to raise the temperature of 10.0 g of the substance by 25.0 ∘C. Aluminum-.897J/g water- 4.184J/g Stainless steel - .500J/g cast iron- .460J/g copper-.385J/g Can someone please show me how to figure this...

*January 29, 2015*

**calc and vectors**

The following table displays the number of HIV diagnoses per year in a particular country. Year 1997 1998 1999 2000 2001 2002 2003 2004 2005 Diagnoses 2512 2343 2230 2113 2178 2495 2496 2538 2518 Using Curve Expert or another curve modelling program, determine an equation that...

*January 10, 2014*

**Calc and Vectors**

A professional basketball team plays in a stadium that holds 23,000 spectators. With ticket prices at $60, the average attendance had been 18,000. When ticket prices were lowered to $55, the average attendance rose to 20,000. Based on this pattern, how should ticket prices be ...

*January 10, 2014*

**Calc and Vectors**

Corey is asked to find the maximum value of a function. Not having a complete understanding of the process, Corey decides to find the derivative of the function, set it equal to zero, and solve. The resulting value, Corey reasons, will yield the maximum point. Explain fully ...

*January 10, 2014*

**Calculus and vectors**

Velocity represents the slope of a displacement function. Suppose an object was moving to the right, then stopped, then continued moving to the right. What would the displacement function look like?

*December 16, 2013*

**Calculus and vectors**

it would appear that for any thrown object has a height that can be expressed using a quadratic expression. The maximum height occurred in the middle of the two zero values. Will this always be the case? What if the ball were thrown from a platform of height 1 m?

*December 16, 2013*

**Calculus and vectors**

A vector can be used to represent the path of a drill tip used to bore a deep mine shaft in Sudbury one quarter of the way to the centre of the Earth. Represent the vector using a directed line segment and Cartesian co-ordinates and describe which representation may be more ...

*September 27, 2013*

**calculus and vectors**

A traffic sign is hanging from two wires. If the weight of the sign is 35 N, what are the tensions in the two wires as shown below? (# in degrees) --------------------- \ 56 45/ \ / \ / \ /

*September 26, 2013*

**Geometry**

A rectangle has area and length. Find the width. Area=27t^2-18t Length= 9t How do I find the width?

*September 4, 2013*

**Chemistry Equilibrium**

The answer is dg=0 only. The other conditions may happen at equilibrium but are not always the case.

*March 14, 2013*

**grammar**

is it a pronoun

*December 18, 2012*

**3rd grade math**

no there is only 14/30 of it left

*December 11, 2012*

**physical sicence**

How fast must a ball be thrown upward to reach a height of 12m?

*September 14, 2012*

**chem**

A distribution curve shows how fractions of non-ionized acid and its conjugate base vary as a function of Ph. The curves of the plot of [CH3COOH] vs. [CH3COO-] vs. PHwill intersect at a Ph of What?

*April 22, 2012*

**chemistry**

A distribution curve shows how the fractions of non ionized acid and its conjugate base vary as a function of Ph. The curves of the plot of [CH3COOH] vs. Ph and [CH3COO-] vs. Ph will intersect at a Ph of what? I need to show work

*April 22, 2012*

**chem**

The ion product Of D2O is 1.35x 10^-15 at 25 degrees C. For a solution to be acidic the PDF must be what?

*April 22, 2012*

**chemistry**

In the presence of a tungsten catalyst at high temperature, the decomposition of ammonia to nitrogen and hydrogen is a zero order process. If the rate constant at a particular temperature us 3.7x10^-6 mol. How long will it take for an ammonia concentration to drop from an ...

*March 26, 2012*

**chem**

Butadiene can undergo the following reaction To form a dimer(two butadiene molecules hooked together). 2c4h8---->c8h12. The half life for the reaction at a given temperature is 5.92x10-2 sec. The reaction kinetics are second order. 1. If the initial concentration of c4h8 is...

*March 25, 2012*

**chemistry**

He says we have To explain it. But I still don't knowwhat he wants us to explain?

*March 25, 2012*

**chemistry**

Many reaction involving heterogeneous catalysts are zeroth order, that is rate=k. An example is the decomposition of phosphine (PH3) over tungsten (w): 4Ph3---> P4 + 6H2 It is found That the reaction is independent of PH3. As lon 1 g as phosphine's pressure is ...

*March 25, 2012*

**chemistry**

The activation energy for the decomposition reaction, 2 HI---> H2 + Hi Is 186 kj/mol. The rate at 555 k is 3.2 x 10 -7L/mol. Sec. What is the rate at 645 k

*March 25, 2012*

**chemistry**

At 25 C the following heats of reaction are known: 2CIf (g)+ O2(g) -> CL2O (g) + f2O Delta H rxn= 167.4 kj/mol 2CIf3(g) + 2O2 (g)-> Cl2O(g) + 3F2O(g) Delta H rxn= 341.4 2F2(g) + O2(g) -> 2F2O(g) Delta H rxn= -43.4kj/mol at the temperature, use Hess's Law to ...

*March 4, 2012*

**chemistry**

excatly, im just as confused. I tried to email him, no reply. The problem says what is the ratio of energy yield on combustion of hydrogen atoms to steam to the yield on combustion of an equal mass of hydrogen molecules to steam given. what am i missing

*March 4, 2012*

**chemistry**

the thermochemical equation for th edissocation of hydrogen gas into atoms may be written : h2-> 2H delta H 1824.2 what is the ration of the energy yield on combustion of hydrogen atoms to steam to yield ion combustion of an equal mass of hydrogen molecules to steam given ...

*March 4, 2012*

**Chem**

a solution containing 100g of unknown liquid and 900g water has a freezing point pf -3.33 C. given kf=1.86 degrees c for water, the moelcular weight of the unknown liquid is what?

*February 12, 2012*

**Physics**

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 12 m/s. If the brick is in flight for 3.5 s, how tall is the building?

*September 11, 2011*

**Physics**

the puma, which can jump to a height of 12.9 ft when leaving the ground at an angle of 44°. With what speed, in SI units, must the animal leave the ground to reach that height?

*September 7, 2011*

**English**

One last question for today that I need checked. What can you assume about the effective-ness of the efforts of Dutch resistance work-ers to sabotate the Nazis? I just put it was very effective, but I feel that it's asking for more in the question, and maybe I'm just ...

*June 28, 2011*

**English**

She is going through a very tough time and can't get herself out of this rutt because she is Jewish?

*June 28, 2011*

**English**

Okay, another question on the Diary Of A Young Girl by Anne Frank. In the book, Anne says this statement: "There is nothing we can do but wait as calmly as we can till the misery comes to an end." How does this statement help to place readers in the historical con-...

*June 28, 2011*

**English**

Is it the war, capulation, arrival of the Germans, and Jewish suffering beginning that began to strain their relationship?

*June 27, 2011*

**English**

Well, I have searched the internet and computer and continue to do so, but I think it has something to do with them moving to the hiding place finally and then her mother starts yelling to her father about Anne and Anne starts yelling to her mother and it all becomes just a ...

*June 27, 2011*

**English**

Why did the relationship between Anne and her mother become strained? In a few sentences, analyze how their relationship as a mother and daughter was changing. This is a question for "The Diary of a Young Girl" by Anne Frank, and the answer is supposedly found on ...

*June 27, 2011*

**PreCalculus**

How would you find the limit of (an + bn) when an=-2 and bn=-16? Or just how to find limits in general?

*March 27, 2011*

**English**

I don't know the answer to this question either, but I desperately need help with it!!! :(

*February 27, 2011*

**Algebra**

The function f(x)=(250x)/(100-x) models the cost, f(x), in millions of dollars, to remove x% of a river's pollutants. Use this functions to solve: If the government commits $750 million for this project, what percentage of the pollutants can be removed?

*January 2, 2011*

**Algebra**

The function f(x)=(250x)/(100-x) models the cost, f(x), in millions of dollars, to remove x% of a river's pollutants. Use this functions to solve: If the government commits $750 million for this project, what percentage of the pollutants can be removed?

*January 2, 2011*

**8th grade math**

circle A has a raduis that is twice the length og the raduis of circle B. Which is an accurate statement about the relationship of these areas of circle A and B and y? a.the area of circle A is 4 times the area of circle B b. the area of circle A is twice the area of circle B...

*December 16, 2010*

**math**

Troy is building a pool that is proportional to the Olympic-sized pool. The width of his pool will be 625 centimeters. find the scale factor troy will use to build his pool use the scale factor to show the length of troys pool if the length of the Olympica pool is 50 meters ...

*December 16, 2010*

**languages**

What words go with each other? 1. conversation 2. narrator's perspective 3. feeling generated by a story 4. background 5. inanimate object with human will 6. overstatement 7. protagonist against someone or something else 8. high point of action 9. action framework 10. used...

*June 2, 2010*

**geomerty**

Write two conditional statements that make up each bioconditinal. 1. A whole number is multiple of 5 and only if its last digit is ethier a 0 or a 5. 2. Two lines are perpendicular if and only if they intersect to form four right angles. 3. You live in Texas if and only if you...

*April 12, 2010*

**Geomerty**

Find a Counterexample to show that the conjecture is false. Conjecture: Any number that is divisible by 6 is also divisible by 12. A. 36 B. 30 C. 48 D. 60 Im thinking that the answer is B. 30, but i was just making sure.

*April 12, 2010*

**CHEM HELPP!**

Chlorine gas can be produced in the laboratory by adding concentrated hydrochloric acid to manganese(IV) oxide in the following reaction.. MnO2(s)+ 4HCl(aq)-->MnCl2(aq)+ 2H2O(l)+ Cl2(g) A. Calculate the mass of MnO2 needed to produce 25.0g of Cl2 B. What mass of MnCl2 is ...

*April 12, 2010*

**Economics**

In the short run, if the Reserve bank decreases interest rates, then consumption and investment_____, planned aggregate expenditure _____ are short-run equilibrium output_____. A: increase, increases, increases B: increase, increases, decreases C: increase, decreases, ...

*August 15, 2009*

**english**

An ear of Corn! Take out the green stuff keep the corn eat the yellow stuff throw away the rest

*August 14, 2009*

**Chemistry**

Why is BF3 a planar molecule, while NH3 is not?

*April 14, 2009*

**pre-calc**

Newline Recyclers processes used aluminum into food or dink containers. The recycling plant processes up to 1200 tons of aluminum per week. At least 300 tons must be produced for food containers, while at least 450 tons must be produced for drink containers. The profit is $17....

*February 17, 2009*

**World Geography**

some solutions are to continue the democracy. working hard to keep a government for the people and works to help better them is key. Colombia's past has had the rich against the poor. this does not help polotically nor economically. drug cartels are taking over and the ...

*February 10, 2009*

**Statistics**

What is the standard deviation of the following data? If necessary, round your answer to two decimal places.13, 11, 4, 5, 6, 9, 10, 12, 15, 16

*December 8, 2008*

**algebra**

how do i find the greatest monomial factor of 4x^2-17? p.s. the ^ means the the number following in superscript((which is a tiny number above it))) it says 4x squared minus 17

*November 29, 2008*

**chemistry**

the question is about learning how to do conversion factors. Thank you for your help

*September 11, 2008*

**chemistry**

well, this is the exact question I have off of an exam and I have to show my work

*September 11, 2008*

**chemistry**

Gasoline in Great Britain costs 1.40 euros per liter. What is the American equivalent cost in Dollars per Gallon? (A "euro" in Britain is equal to $1.59 in American)...Please help me answer this!!!!!

*September 11, 2008*

**Physical Education**

lots of endurance work is needed for touchfooty.specific skill training such as drives,passing, switching and drills at least 2 times a week will greatly improve performance for competition and i found that running atleats 3km twice a week enhanced my endurance capacity and ...

*May 7, 2007*

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