Monday
April 21, 2014

Posts by Derek


Total # Posts: 240

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...

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?

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.

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 st...

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 st...

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?

American Corrections
THE OPENING OF EASTERN STATE PENITENTIARY IN 1829 MARKED FULL DEVELOPMENT OF WHAT

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 in...

science
Is a wart an example of a papule or a nodule?

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 rea...

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.

algebra
Draw And Shade a figure that represents 150%.

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)?

Calculus
Actually he forgot to convert the kpa(1000 * N/m^2) into 1000 * N/cm^2

writing skills 1
what is the name of the common error in the sentences

religion
what role does religion play in society in North Korea?

math-please help!
4/3x+2/3x

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?

math
7[3m-(m+6)] G.T. -6(M-1)

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.

maths
iam a common multiple of 3 & 7 my digits have a total of 9

Calc
0 and 1

10th grade social studies
Commonly sorry.

10th grade social studies
How does trade and offering cominly diverse choices INCREASE diversity? Thanks Ms.Sue for answering my last question! ^^

10th grade social studies
I don't get what "What message do these 2 sources present about the impact of globalization on identity?" means..

English
I want to know all the Rhetorical and Figurative Devices and Examples in the Essay Hidden Lesson by David Suzuki

college physics
tsrusjnsrthnb

college physics
tsrusjnsrthnb

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 ...

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.

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. - ...

12th grade English
Thank you so much, this really helped me a lot.

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

PC Basics
16

Math
find the unit rate for 9.25 for 18 pounds

Algebra
Is there really any difference between vertical asympotes and domains in functions? Are they always the same numbers? Thanks

algebra
How can you tell whether a function is rational or not? And how do you determine holes of a graph? Thanks!

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 i...

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...

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...

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 th...

college-Intermediate Microeconomics
The Lump Sum Principle In the 1980s Margaret Thatcher was the British Prime Minister. She was very popular and e ective 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 scenari...

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?

math
solve each of the following equations by the square root method and show your work 4x²-20=0

math
solve each of the folowing equations by factoring and show your work x²+x²=13x²-36

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

math
solve each of the folowing equations by factoring and show your work x²+x²=13x²-36

math
solve each of the following equations by factoring and show your work 12x² + 15x + 10= -10x -2

math
solve each of the following equations by completing the square and show your work x² + 6x + 24=0

math
solve each of the following equations by completing the square and show ur work x²-4x=32

math
solve each of the following equations by the square root method and show your work (3x + 2)²=8

Mason
solve each of the following equations by the square root method and show your work 4x²-20=0

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...

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 ...

Essay
So, what is your question/problem with this?

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...

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.

Calc.
How do I deal with square roots and derivatives? Like: f(x)= Sqrtx....the derivative. find

Calc.
What is the derivative of this: not sure because of the pi.... f(x)=x^pi Thanls.

Calculus
I figured out e but I am confused for the rest of the equation.

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 nev...

Calc.
Nvm, I figured this out myself. :)

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.

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.

Calc.
yes....f(a+h)-fa)/h

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.

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!

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.

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 th...

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...

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!

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...

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...

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 s...

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!

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.

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

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...

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 describ...

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.

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?

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!

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.

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

Calculus
I think I found my mistake, I added wrong lol!

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?

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!

Calc.
THANKS!!! You ROCK!!!

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 dir...

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 ...

Calculus
What does this mean? For any vector Vector a find Vector a × Vector a. Explain why (this is cross product stuff). Thanks

Calculus
I don't really understand what you mean, sorry. Can you explain it differently?

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?

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

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!

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 numbe...

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

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 g...

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 app...

writing
Is that your actual thesis statement? And in addition, do not use personal words (I, me, we, us,) and only refer to things as she, he, it, they, after you have specified what you are discussing (just on a side note). Ok, so your thesis statement should be more like: Shoe adver...

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