Friday

August 22, 2014

August 22, 2014

Total # Posts: 241

**AP Chem**

Pretend you are a nuclear scientist and try to answer this bonus question. Uranium -235 (235U) is used as a fuel in nuclear power plants. However, natural uranium contains mostly U -238 (238U) and very little uranium -235. Therefore, it is necessary that the natural uranium be...
*November 1, 2010*

**11th grade AP Chemistry**

can someone please help me! my test is on tuesday on this stuff and this is the one question that I am confused about!
*October 30, 2010*

**11th grade AP Chemistry**

Pretend you are a nuclear scientist and try to answer this bonus question. Uranium -235 (235U) is used as a fuel in nuclear power plants. However, natural uranium contains mostly U -238 (238U) and very little uranium -235. Therefore, it is necessary that the natural uranium be...
*October 30, 2010*

**physics**

What was the initial kinetic energy of the small mass before the collision? What is the kinetic energy of the two-mass combination after the collision?
*October 26, 2010*

**physics**

A 1600 kg car travels at a speed of 10.5 m/s. What is its kinetic energy? Assume that air resistance is negligible.
*October 24, 2010*

**physics**

can some one help me with coming with a better way to word theses annswers. As the angle increases, what happens to the tension in the string? *the the tension in the string will get tighter or larger for t1 What would you have to do to the angle to make the tension in the ...
*October 20, 2010*

**physics**

can some one help me with coming with a better way to word theses annswers. As the angle increases, what happens to the tension in the string? *the the tension in the string will get tighter or larger for t1 What would you have to do to the angle to make the tension in the ...
*October 20, 2010*

**physics**

1.If a mass is 15 cm from the axis of rotation and makes 25 revolutions in 10 seconds, what is its speed in m/s? 2.If m = 0.1 kg and the values above still hold, what is the numerical values of the centripetal force?
*October 18, 2010*

**American Corrections**

THE OPENING OF EASTERN STATE PENITENTIARY IN 1829 MARKED FULL DEVELOPMENT OF WHAT
*October 18, 2010*

**Mat 126**

A community college has 3,000 students and 90 instructors. The college plans that enrollment will be 3,500 next year. How many new instructors should be hired if the college wants to keep the same student to instructor ratio? 13 instructors 15 instructors 105 instructors 77 ...
*October 10, 2010*

**science**

Is a wart an example of a papule or a nodule?
*September 2, 2010*

**science**

Which of the following groups of tissue types is found in blood vessels? A. Connective, muscle, and nervous tissues B. Muscle and nervous tissues C. Connective, epithelial, and nervous tissues D. Epithelial and muscle tissues I think it's C because I don't remember ...
*September 2, 2010*

**Health**

Normal urine is ____, as indicated by its pH value. A) slightly alkaline, B) neutral, C) slightly acidic, D) extremely alkaline Normally I would post what my answer is along with the question but on this one I have NO CLUE! I can't find the answer anywhere.
*September 1, 2010*

**algebra**

Draw And Shade a figure that represents 150%.
*August 25, 2010*

**chemistry**

How many grams of ammonia are formed when 1.34 grams of nitrogen react with an excess of hydrogen(3 H2 + N2 reacts to form 2 NH3)(Answer to tenths ex. 2.5)?
*July 6, 2010*

**Calculus**

Actually he forgot to convert the kpa(1000 * N/m^2) into 1000 * N/cm^2
*June 19, 2010*

**writing skills 1**

what is the name of the common error in the sentences
*May 25, 2010*

**religion**

what role does religion play in society in North Korea?
*May 16, 2010*

**math-please help!**

4/3x+2/3x
*April 25, 2010*

**Physical Science**

a player uses a hockey stick to increase the speed of a 0.200 kg hockey puck by 6 m/s in 2 seconds is the acceleration 3 m/s2?
*April 14, 2010*

**math**

7[3m-(m+6)] G.T. -6(M-1)
*March 21, 2010*

**Math**

Find an equation of a plane through the point (1, 5, 1) which is orthogonal to the line x=3+5t y=5-1t z=-1+4t in which the coefficient of x is 5.
*February 1, 2010*

**maths**

iam a common multiple of 3 & 7 my digits have a total of 9
*January 24, 2010*

**Calc**

0 and 1
*December 2, 2009*

**10th grade social studies**

Commonly sorry.
*November 17, 2009*

**10th grade social studies**

How does trade and offering cominly diverse choices INCREASE diversity? Thanks Ms.Sue for answering my last question! ^^
*November 17, 2009*

**10th grade social studies**

I don't get what "What message do these 2 sources present about the impact of globalization on identity?" means..
*November 17, 2009*

**English**

I want to know all the Rhetorical and Figurative Devices and Examples in the Essay Hidden Lesson by David Suzuki
*October 26, 2009*

**college physics **

tsrusjnsrthnb
*October 11, 2009*

**12th grade Social Science**

Can anyone help me with these questions? How was the culture of the Baby Boom so different from that of previous generations? Why are members of Generation X frustrated with Baby Boomers? What are some of the important impacts of Generation Y on the economy? What are the main ...
*July 6, 2009*

**12th grade- Social Science**

Men who are more socially isolated are more likely to abuse their wives than are men who are socially integrated. Can you not do this topic because I just need an example of another topic in the format above.
*July 3, 2009*

**12th grade- Social Science**

I need help in making a hypothesis statement for a certain topic, I chose at school. Can anyone give me an example of one? Here is the format, my teacher wants: (The - represents the boxes, he put for each) TOPIC: - - OVERVIEW OF TOPIC: A brief description about your topic...
*July 3, 2009*

**12th grade English**

Thank you so much, this really helped me a lot.
*July 2, 2009*

**12th grade English**

How does Saki in "The image of the lost soul" use descriptions of places to reach desired effect in story? Can anyone tell me how? an example form the text would be helpful
*July 2, 2009*

**Math**

find the unit rate for 9.25 for 18 pounds
*February 9, 2009*

**Algebra**

Is there really any difference between vertical asympotes and domains in functions? Are they always the same numbers? Thanks
*January 22, 2009*

**algebra**

How can you tell whether a function is rational or not? And how do you determine holes of a graph? Thanks!
*January 22, 2009*

**probability and statistics**

a set of 10 cards consists of 5 red cards and 5 black cards. the cards are shuffled thoroughly and i choose one at random, observe its color, and replace it in the set. the cards are thouruoghly reshuffled and i again choose a card at random, observe its color and replace it ...
*November 24, 2008*

**Urgent Chemistry!!**

1 mol of an ideal gas expands under isothermal conditions (T=298.15K). The initial pressure and volume is 2.00 atm and 1.00L respectively, and the final pressure is 1.00 atm. Find the expansion work. The answer is w = -101.325 J. I am unsure how to get this answer. Can someone...
*November 16, 2008*

**Chemistry**

1 mol of an ideal gas expands under isothermal conditions (T=298.15K). The initial pressure and volume is 2.00 atm and 1.00L respectively, and the final pressure is 1.00 atm. Find the expansion work. The answer is w = -101.325 J. I am unsure how to get this answer. Can someone...
*November 16, 2008*

**Chemistry Confusion!**

1 mol of an ideal gas expands under isothermal conditions (T=298.15K). The initial pressure and volume is 2.00 atm and 1.00L respectively, and the final pressure is 1.00 atm. Find the expansion work. The answer is w = -101.325 J. I am unsure how to get ...
*November 15, 2008*

**college-Intermediate Microeconomics**

The Lump Sum Principle In the 1980s Margaret Thatcher was the British Prime Minister. She was very popular and eective until she pushed for the idea of a so called lump-sum tax. The lump-sum tax is one in which every citizen pays a single xed payment. Consider the ...
*October 8, 2008*

**physics**

A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
*September 16, 2008*

**math**

solve each of the following equations by the square root method and show your work 4x²-20=0
*September 7, 2008*

**math**

solve each of the folowing equations by factoring and show your work x²+x²=13x²-36
*September 7, 2008*

**math**

(x+1)(4x©ø-4x©÷) 1(x+1)+4x©÷(x+1) (1-4x©÷)(x+1) 1-4x©÷=0 -4x©÷+4 0+4=4 ¡î1=¡î4x©÷ 1=2x
*September 7, 2008*

**math**

solve each of the folowing equations by factoring and show your work x²+x²=13x²-36
*September 7, 2008*

**math**

solve each of the following equations by factoring and show your work 12x² + 15x + 10= -10x -2
*September 7, 2008*

**math**

solve each of the following equations by completing the square and show your work x² + 6x + 24=0
*September 7, 2008*

**math**

solve each of the following equations by completing the square and show ur work x²-4x=32
*September 7, 2008*

**math**

solve each of the following equations by the square root method and show your work (3x + 2)²=8
*September 7, 2008*

**Mason**

solve each of the following equations by the square root method and show your work 4x²-20=0
*September 7, 2008*

**URGENT! Last calculus question!**

Hey! So, I was wondering if someone could answer this. I am mad studying for my exam and I still have a few questions left that I just don't have time to answer, and the assignment is due tomorrow. Thanks and here is the question: Use calculus and algebraic methods to do a...
*July 29, 2008*

**Calculus (final question I promise)**

1. Use calculus and algebraic methods to do a complete analysis (i.e., intercepts, critical points, intervals of increase and decrease, points of inflection, intervals of concavity, local maximum or minimum points) for each of the following functions and then sketch the graph ...
*July 28, 2008*

**Essay**

So, what is your question/problem with this?
*July 25, 2008*

**Urgent CALCULUS**

So, I haven't posted in a while...but now I am stummped! Only question I can't get today! A team of students seeks to make a flag representing their commitment to the earth. They will be using a green triangle inscribed in a yellow semi-circle. Find the maximum area of...
*July 25, 2008*

**Calc.**

What function would have a derivative of ƒ′(x) = 12x2 + 4x − 10? Explain how you arrived at your answer...I believe the answer is this: f(x)=4x^3+2x^2-10x...and I got this using the power rule and multiplying. Thanks.
*July 16, 2008*

**Calc.**

How do I deal with square roots and derivatives? Like: f(x)= Sqrtx....the derivative. find
*July 16, 2008*

**Calc.**

What is the derivative of this: not sure because of the pi.... f(x)=x^pi Thanls.
*July 16, 2008*

**Calculus**

I figured out e but I am confused for the rest of the equation.
*July 15, 2008*

**Calculus**

For the decomposition of Carbon 14, find the age of a prehistoric cave painting discovered in the Lascaux Caves in southern France if the amount of Carbon 14 has decayed to 14.29%...again using calculus formulas. Not sure how to use this equation (content section of course ...
*July 15, 2008*

**Calc.**

Nvm, I figured this out myself. :)
*July 15, 2008*

**Calc.**

My other questions I didn't understand what e was either. My calculator does not allow me to perform the function that you told me. Please further explain.
*July 15, 2008*

**Calc.**

Using calculus: If you invest $5000 compounded continuously at 4% p.a. how much will this investment be worth in 5 years? I am not sure what e is. Should my equation be this: A(t)=Pe^rt A(t)=(5000e^(0.04)(5)) Thanks.
*July 15, 2008*

**Calc.**

yes....f(a+h)-fa)/h
*July 14, 2008*

**Calc.**

For the function ƒ(x) = x^3 - 8x + 3, calculate where a = 5 and h = 2. Simplify before substitution (the simplifying is where I am having problems...not sure if my answer is right). Thanks. Using the limits equation.
*July 14, 2008*

**Calc.**

verify that lim h>0 (e^x+h -e^h)/h=e^x and explain how this illustrates that ƒ′(x) = ln e • ƒ(x) = ƒ(x)... The notes for this section suck big time, so I really don't know where to begin with this. Thanks!
*July 14, 2008*

**Calc.**

Determine the interaction of the line of intersection of the planes x + y - z = 1 and 3x + y + z = 3 with the line of intersection of the planes 2x - y + 2z = 4 and 2x + 2y + z = 1.
*July 10, 2008*

**Calc. for Reiny**

this can be done by projections of two vector. recall that the scalar projection of vector b on vector a is a∙b/│a│ so let's find a point on the give line, e.g. the point B(6,0,1) (I let t=0) draw a perpendicular from your given point P(1,-5,2) to meet ...
*July 10, 2008*

**Calc.-Blanking!**

wait actually I don't think you can do that...but then I have a problem. I am supposed to find the distance of the point to the line or something like that of the point (1,-5,2) and the line r=(6,0,1) + t(3,1,2) but I thought you needed the scalar equation in order to find...
*July 9, 2008*

**Calc.-Blanking!**

Wow, so it is late and I can't think! How do I put this into scalar form: r=(6,0,1) + t(3,1,2)? thanks!
*July 9, 2008*

**Calc.**

Use normal vectors to determine the intersection, if any, for each of the following groups of three planes. Give a geometric interpretation in each case and the number of solutions for the corresponding linear system of equations. If the planes intersect in a line, determine a...
*July 9, 2008*

**Calc.**

Use normal vectors to determine the intersection, if any, for each of the following groups of three planes. Give a geometric interpretation in each case and the number of solutions for the corresponding linear system of equations. If the planes intersect in a line, determine a...
*July 9, 2008*

**Calc.**

I am so confused with this last part of the unit! What in the world is going on: Use normal vectors to determine the interaction, if any, for each of the following pairs of planes. Give a geometric interpretation in each case and the number of solutions for the corresponding ...
*July 9, 2008*

**For Everyone on Jiskha**

Hey, I just wanted to say a HUGE THANKS to everyone on this website for helping me out so far with calculus. I am actually understanding a lot because of the help I am getting, you are all a really big help. I appreciate it so much thanks!
*July 7, 2008*

**Calc.**

I just copied the question as it was...I tried asking a friend and the teacher about k. When I tried to work it out, I assumed that the direction vector was 0, because it was not k+t or any number at all, but I am still unsure. Thanks.
*July 7, 2008*

**Calc.**

Determine the value of k so that the line with parametric equations x = 2 + 3t, y = -2 + 5t, z = k is parallel to the plane with equation 4x + 3y – 3z -12 = 0
*July 7, 2008*

**Calc.**

An air ambulance is travelling from Barrie to Toronto. Toronto is located 90 km [S5°E] of Barrie. If the wind is blowing from the South with a velocity of 62 km/h, and the plane’s air speed is 375 km/h, what direction must the pilot fly to make it to Toronto? How do I...
*July 6, 2008*

**Summer School Calculus**

I don't know how to answer this: 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 ...
*July 5, 2008*

**Calc.**

Determine vector, parametric and, if possible, symmetric equations for the line through Q(2, -1, 3) and the mid-point of the line segment from L(3, -2, 5) to M(1, 4, -7). Not sure what to do with the mid-point.
*July 4, 2008*

**Calculus:Help!**

Ok, well both sides are equal yes, but you can't actually do what they are asking right? Because you do the brackets first, and a dot product provides a scalar answer, therefore, you can't add a scalar to a vector, because that is meaningless. Is this correct?
*July 3, 2008*

**Calculus:Help!**

Verify using an example that a + ( b• c) = (a •b ) +c ? Explain your reasoning. I have been over this a thousand times and I don't understand (the notes I was given online are incorrect so I don't know how to answer this). THANKS!
*July 3, 2008*

**Calculus:Help!**

Any ideas on how to solve this: Use a vector solution to show that a scalar equation for the line through the points P1(x1, y1) and P2(x2, y2) is y-y1/x-x1 = y2-y1/x2-x1? Very confused as to what is meant by this question. Thanks.
*July 3, 2008*

**Calculus**

Yup, I got it, it should be r= (-1,4) + (3,-5), tER..yay for me! lol
*July 3, 2008*

**Calculus**

I think I found my mistake, I added wrong lol!
*July 3, 2008*

**Calculus**

Determine a vector equation for the line through the points (-1, 4) and (2, -1). I said: r= (-1,4) + (4,-5), tER, is that correct?
*July 3, 2008*

**Calculus**

So, yet again, I am confused! State whether or not the following statements are true. Justify your reasoning. a). a• ( b+c ) = a• b + a • c b.) a × ( b+c ) = a × b + a × c c.) a × ( b•c ) = a × b • a × c Thanks, again!
*July 2, 2008*

**Calc.**

THANKS!!! You ROCK!!!
*July 2, 2008*

**Calculus**

Well ok, I am confused as to how to draw the diagram. But firstly, I am not sure if you accounted for this, but if a wind is coming from the South, you drawing it pointing in the North direction, if you are coming from somewhere, it means you are travelling in the opposite ...
*July 2, 2008*

**Calculus**

An air ambulance is travelling from Barrie to Toronto. Toronto is located 90 km [S5°E] of Barrie. If the wind is blowing from the South with a velocity of 62 km/h, and the plane’s air speed is 375 km/h, what direction must the pilot fly to make it to Toronto? What on ...
*July 2, 2008*

**Calculus**

What does this mean? For any vector Vector a find Vector a × Vector a. Explain why (this is cross product stuff). Thanks
*July 1, 2008*

**Calculus**

I don't really understand what you mean, sorry. Can you explain it differently?
*June 30, 2008*

**Calculus**

I am asked this: How can you do the cross product of two-dimensional vectors. Well I would have to guess that you just add a 0 in order to follow the cross product method, but this way there is no third component...is this right?
*June 30, 2008*

**Calculus**

My logic was this, as stated from a text book, which also showed your way: the projection of vector a onto b is found by (magnitude a)(magnitude b)(vector b) all over (magnitude b)2
*June 30, 2008*

**Dot product**

I am sure, because I tried looking at the question again. Because the only thing that would make sense would be if k=2 but there would need to be a negative somewhere. Could be a typo. Thanks!
*June 30, 2008*

**Dot product**

I cant get the correct answer and I can't figure out what I am doing wrong. If a=(2,2k) and b=(4,k) are perpendicular, find k. I have worked it out, and I got -2 but it doesn't work when I check it in the original equation. It should be a.b=0 and then plug in the ...
*June 30, 2008*

**Diagram for already posted question**

A force of magnitude 15 N is the resultant of two forces, one of which has a magnitude of 8 N and acts at an angle of 30° to the resultant. Find the magnitude and direction of the other force..what should my diagram look like? Thanks
*June 30, 2008*

**Urgent SUMMER SCHOOL CALCULUS**

I did it a little differently: Horizontal Components: 9cos 60=4.5 and 2cos30=1.7 and added they are 6.2 which gives the horizontal resultant Vertical: 9sin60=7.8 and 2sin30=1 and added they are 8.8 which is the vertical resultant Then using an equation I found magnitude, and ...
*June 29, 2008*

**Urgent SUMMER SCHOOL CALCULUS**

Add these two vectors: I used component law, and I got an answer, but I am unsure as to how to do the direction at the end. Add: 9m/s [N30E] and 2m/s [N60E] I wound up with 10.8m/s and I found an angle of 55 but I am unsure as to what do with the 55: thanks for the help, I ...
*June 29, 2008*

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