Derek

This page lists questions and answers that were posted by visitors named Derek.

Questions

The following questions were asked by visitors named Derek.

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?

17 years ago

In the DNA helix, a ________ (a bicylic nitrogenous base) is always paired with a __________, (a moncyclic nitrogenous base). This occurs because pairing of two of the same kinds of bases would either cause ____________ in the DNA molecule. a. Pyrimidine,...

19 years ago

what is a the soild material in a solution called? It is called the solute; however, there are many solutions in which no solid is involved. Thank you for helping

18 years ago

what are the properties of a solid - this is for 5th grade the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape Solids have a defin...

18 years ago

What happened in FLorida in 1909? http://www.fws.gov/policy/029fw3.html

18 years ago

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

17 years ago

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 plu...

17 years ago

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

17 years ago

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: than...

17 years ago

Another one for you :P, add these two vectors using trigonometry (again)... 9N[S2W] and 11N[N31W]...Again, I am confused about the angles, I am not sure what value I should use for the cosine and sine law. THANKS AGAIN!!

17 years ago

Add the following vectors , 7m/s [N30E] and 2m/s [S17E], using trigonometry. Once you draw these out into diagrams, you use the triangle law yes? How do you find the angles to use in the cosine and sine law? A little confused, thanks for the help.

17 years ago

I have the following marathon problem but am unsure where to start: A Sample consisting of 22.7g of nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.00cm, and a piston is carefully placed on the surface of the compound...

18 years ago

How do I know if a syllable is stressed or unstressed?

17 years ago

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.

17 years ago

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!

17 years ago

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.

17 years ago

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...

17 years ago

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!

17 years ago

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 f...

17 years ago

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...

17 years ago

What is the ABCs of healthful living

17 years ago

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!

17 years ago

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

17 years ago

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-ord...

17 years ago

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.

17 years ago

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!

17 years ago

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.

17 years ago

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?

17 years ago

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!

17 years ago

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 Toro...

17 years ago

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.

17 years ago

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...

17 years ago

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

17 years ago

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

17 years ago

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.

17 years ago

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 m...

17 years ago

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...

17 years ago

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 algebra...

17 years ago

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

17 years ago

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

17 years ago

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

17 years ago

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

17 years ago

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...

17 years ago

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. Co...

17 years ago

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...

16 years ago

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...

16 years ago

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

16 years ago

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

16 years ago

I need a tube that is 118cm long. The total allowance is 158cm by Multiplying the LxWxH. What circumference can the tube be.

13 years ago

find the unit rate for 9.25 for 18 pounds

16 years ago

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

16 years ago

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 descriptio...

16 years ago

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 econo...

16 years ago

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

15 years ago

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.

15 years ago

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

15 years ago

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?

15 years ago

what role does religion play in society in North Korea?

15 years ago

Draw And Shade a figure that represents 150%.

15 years ago

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 anywher...

15 years ago

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'...

15 years ago

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

15 years ago

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?

14 years ago

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...

14 years ago

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

14 years ago

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?

14 years ago

0.17 kg point mass moving on a frictionless horizontal surface is attached to a rubber band whose other end is fixed at point P. The rubber band exerts a force F = bx toward P, where x is the length of the rubber band and b is an unknown constant. The mas...

14 years ago

4x2squared +9 \3-(8+3)

14 years ago

A gatling gun fires at a rate of 2000 rounds per minute. If the bullets travel at a speed of 800m/s, how far apart are the bullets?

14 years ago

I have trouble understanding whats the three psychological models of mental illness include etiological explanation and the principle therapeutic modality that evolved from the model. Can anyone help me? Thanks

14 years ago

Riverside Oil Company in eastern Kentucky produces regular and supreme gasoline. Each barrel of regular sells for $21 and must have an octane rating of at least 90. Each barrel of supreme sells for $25 and must have an octane rating of at least 97. Each o...

14 years ago

1.Nordstrom creates an open atmosphere, in which every associate’s sales figures are made available to everyone else. Explain the positive impacts.While this is intended to foster creative tension, how might it lead to unhealthy destruction?

14 years ago

A projectile is fired from the origin with an initial velocity V₁=100m/s at an angle θ₁=30⁰. Another is fired from a point on the x-axis at a distance x₀=60m from the origin with initial velocity V₂=80m/s at an angle of θ₂. It is desired to have the two p...

14 years ago

a large square has sides of 24 units, midpoints of its sides are connected to create a smaller square. what is the area of the smaller square

13 years ago

Solve the following differential equation: f"(x)=sinx, x(0)=0, x'(0)=1

13 years ago

How much heat is required to warm 1.50 kg of sand from 20.0 C to 100.0 C?

13 years ago

A point charge q=+4.7nC is placed at each corner of an equilateral triangle with sides of 0.21m in length. a) What is the magnitude of the electric field at the midpoint of the three side of the triangle? b) Is the magnitude of the electric field at the c...

13 years ago

How many different integer values of n satisfy the inequality 1/13 < 2/n < 1/10? F. 1 G. 2 H. 3 J. 4 K. 5

13 years ago

The height of a parallelogram is 10 feet more than its base. If the area of the parallelogram is 120 square feet, find its base and height.

13 years ago

If you could reach absolute zero then? A) The system falls into quantum ground state B) The system will have an entropy of zero C) Molecules will not overlap, D) Particles will continue to move E) There is still zero-point energy Are all of these true?

13 years ago

If y= (x^2+20)/(x-4) Find all critical Numbers. After get f' i got the answer -5/4. What did i do wrong or is that the critical number?

13 years ago

Find the maximum and minimum product of 2 numbers who sum is 5

13 years ago

Find the maximum area of a rectangle that lies above the x axis and below y=9-x^2

13 years ago

An open top bos with a square base is to be constructed from 192 sq ft of material. What should be the dimensions of the box if the volume is to be a maximum? What is the maximum volume?

12 years ago

A company wishes to issues bonds with a coupon rate of 5%. The company wishes to raise 100 million dollars net of commissions (5% of total sales). Each bond has a face value of $1,000 and matures in 10 years. Interest is to be paid semi-annually. Using th...

12 years ago

What types of devices use USB ports?

12 years ago

Answers

The following answers were posted by visitors named Derek.

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

17 years ago

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

17 years ago

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!

17 years ago

My diagram doesn't work out, I have done it to scale, but I can't figure out how to draw it. I got the same answers as everyone above, I used the cosine and sine law to do mine (I got my answer after I posted :) ). But my diagram looks weird. Any thoughts...

17 years ago

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...

17 years ago

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...

17 years ago

I think the answer would be 10.8m/s [N35E]. Am I correct?

17 years ago

Thanks! I agree about the components but the question said specifically to use cosine and sine law :(. Thanks very much though!

17 years ago

I used the sine law to get 15 degrees. I am unsure as to what I now do with this angle. Do I add or subtract it somewhere to find the overall angle I am looking for? Thanks again! I owe you!

17 years ago

Could you help me with these words? lore, lend, increase, and interrupts. Thanks for the help.

17 years ago

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

17 years ago

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 equatio...

17 years ago

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.

17 years ago

Input 17 28 47 50 54 63 71 Output 59 48 29 26 22 13 5

17 years ago

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 cor...

17 years ago

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

17 years ago

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

17 years ago

THANKS!!! You ROCK!!!

17 years ago

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 travelli...

17 years ago

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.

17 years ago

Nvm, I figured this out myself. :)

17 years ago

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

17 years ago

So, what is your question/problem with this?

17 years ago

(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

17 years ago

Thank you so much, this really helped me a lot.

16 years ago

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.

16 years ago

UGH! I've been working on this problem for about an hour now for my test tomorrow at WMU. No luck. =( My guess? Impossible. =P

14 years ago

None of the links explain three models of mental illness

14 years ago

The problem is I can't find the name of each models

14 years ago

Actually I got it. Its psychoanalytic, humanistic, and behavior. So the question is describe three psychological models of mental illness (psychoanalytic, humanistic, and behavior) include etiological explanation and the principle therapeutic modality tha...

14 years ago

NaNO2 + HSO3NH2 = NaHSO4 + H2O + N2

14 years ago

Yes, thank you so much.

14 years ago

the answer i would say has to be reassuring him that you are going to take good care of his wife.

14 years ago

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

13 years ago

54x3y

13 years ago

sorry that answer was wrong tis is the right one 3x(43+82/3)*(879/615=y78)

13 years ago

What help do you need? Please be specific!!!

13 years ago

Celsius= 5/9*(Fahrenheit-32) Celsius= 5/9*(72-32) Celsius= 22.22 degrees celsius

13 years ago

Sorry I was not more clear. The airline has stated that A container can be carried but must not exceed 158cm in total. eg. LxWxH The container I need to take is a tube that must be 118cm long. I need to know what diameter the tube can be to meet the overa...

13 years ago

Are you sure that's correct because someone told me the answer is Sell or Bargain

12 years ago

buying and selling

12 years ago

So your saying the answer is Bargain?

12 years ago

so is it sell or bargain?

12 years ago

Thanks, I wasn't so sure at first, I guess I just forgot

12 years ago

Just out of curiosity, how would you figure out the delta g if you didn't know the delta h? I don't think it is possible, is it? And also, can you explain how you knew it was exothermic?

11 years ago

R=Ro+Ro*a*(T-To) (2Ro-Ro)/Ro=a*(T-To) we want to double resistance. For example if our initial resistance is 10, we want R to be 20, therefore R=2Ro. (2Ro-Ro)/Ro=1, so 1/alpha=T-To divide by alpha (1/alpha)+To=T add To to both sides So To=20C. Alpha from...

11 years ago

This would not happen in household wiring because of circuit breakers.

11 years ago

I've used the two-point form of the Arrhenius equation and I keep ending up with 9.8x10^-3 for k2

10 years ago

But the answer is supposed to be 2.2x10^-2

10 years ago

I was using Ea in joules/mol, thank you for your help!

10 years ago

it is division

10 years ago

h+f = 120 h+p = 230 p = 6f h+6f = 230 h+6(120-h) = 230 h+720-6h = 230 -5h = -490 h = 98

9 years ago

50 feet long and 30 feet wide with 9 feet tall, what is the volume of the interior of the second floor

9 years ago

puddin pops yumyumyumyum olololololololo i love you bby

9 years ago

8 years ago

Thank you for all the help. I know I must make my decision. I already have an idea of how I want to answer it. Thanks for giving it in a different perspective and also, for the sources. I will use these to evaluate my thoughts.

8 years ago

Alright, thank you for your response!

8 years ago

Two bicyclists, starting at the same place, are riding toward the same campground by two different routes. One cyclist rides 1230 m due east and then turns due north and travels another 1430 m before reaching the campground. The second cyclist starts out...

8 years ago

Bill of rights

7 years ago

@bonsnian, -3^2 is NOT -9, it’s 9. -5^2 is NOT -25. You are an idiot. Double check your answers before posting them.

7 years ago

@bonsnian, nevermind I’m a !@#$%^&. !@#$%^& me.

7 years ago

@bonsnian, I used my iPhone calculator (simple calculator)

7 years ago

Why is it three pi r squared?

5 years ago

From that, I got C.

5 years ago

Potatoes Is wrong i fog 1/4 the correct answers are 100% 1. B 2. A 3. B 4. A Trust me I won't lie

4 years ago

Nobody, I<3Unicorns, Warrior Cat Lover are all correct I got an 21/21=(100.00%) :) :) :) :) :) :) :) :)

4 years ago

Thanx chris

4 years ago

Thx @idk you are 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000% correct 4 Assessment Items 4/4 Points Earned Item 1 - Correct 1/1 Point Earned Item 2 - Correct 1/1 Point Earned Item 3 - Correct 1/1 Point Earned It...

4 years ago

Thanks Randomthing 100%

4 years ago

Building Vocabulary Online Practice 1. C 2. A 3. B 4. D 5. A 6. A 7. A 8. A 9. A 10. A This 100% correct

1 A 2 C 3 A 4 D 5 A 6 A 7 A 8 A 9 B 10D 11D 12 French Italian 13 From Left to Right Up to Down Proto-Indo-European, latin, Germanic, Indo-European Slavic 14 From Left to Right Up to Down Investment, Higher Literacy, Productive, Higher Standard of living,...

3 years ago

tell me when im correct

3 years ago

yes it is correct :)

3 years ago

i am giving away an xbox gift card for 25 dollars

EDDIE MUNSON DIES IN STRANGER THINGS 4 PART 2

3 years ago

Yeah, it doesn't fascism. Ever heard of Anarcho Communism? its when communism is in place, but no leaders. aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

3 years ago

MY NAME IS DEREK

3 years ago