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?

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

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

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...

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

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...

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...how do I begin to solve this!?

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...

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.

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...

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

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.

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.

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...

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!

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...

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...

What is the ABCs of healthful living

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!

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

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...

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!

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.

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?

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!

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...

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.

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...

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

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

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.

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...

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...

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...

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

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

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

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

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...

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...

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...

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

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

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

find the unit rate for 9.25 for 18 pounds

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

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...

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...

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

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.

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?

what role does religion play in society in North Korea?

Draw And Shade a figure that represents 150%.

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...

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'...

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?

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

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...

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

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

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...

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?

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...

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

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

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

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...

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

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.

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?

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?

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

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

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?

What types of devices use USB ports?

A client comes in and asks for a pregnancy test. What do you do?

Which of the following words is different from the others? A. Sell B. Trade C. Barter D. Bargain

a banner requires 1 1/2 sections of plastic. How many banners can be made from 12 sections of plastics? A.7 B.8 C.9 D.15

2/3/3= A. 2/9 B. 1/9 C. 1 D. 2

Is v=s2 a quadratic relation?

Write the equation for the depreciation of the value of your car for t years at 14% per year.

A fence is 20 ft long. it has posts at each end and at every four feet along its length. how many fence posts are there? Draw a picture.

The glass in Lee’s window needs replacing. It is 30 inches wide and 24 inches long. What is the area (A) of the glass Lee should buy? A. A = (2 × 30) + (2 × 24) = 108 in. B. A = 30 × 24 = 720 in2 C. A = 2 × (30 + 24) = 108 in2 D. A = 30 + 24 = 54 in.

Denise took a total of 80 calls on her shift at work today. Of those 80 calls, 55% were resolved, 15% escalated to a supervisor, and 10% required that a technician be sent out to the customer's house. What is the total number of calls that Denise resolved...

Including 5% sales tax, an inn charges $210.00 per night. Find the nightly cost at the inn before tax is added. (a) Write an equation to model the problem. Let x represent the nightly cost before tax. (b) Solve the equation to find nightly cost before tax...

$8000 is shared between 3 schools in the ratio of 2:3:5, how much will each school get?

If a metal bar at a temperature of 20 degree celcius is dropped in boiling water how long will it take for the bar to reach 98 celcius at a rate of 2 degrees per second

(4.3 x 10-8) (1.5 x 109) Compute and write in scientific notation

When magnesium hydrogen carbonate reacts with sulfuric acid, would you consider that an exothermic reaction because it forms CO2 (gas)?

The aquation of tris(1,10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)32++ 3 H3O++ 3 H2O →Fe(H2O)62++ 3 phenH+. If the activation energy, Ea, is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1, what...

simplify: 6-y/6/1/6-1/y 6-y/6*6y/y-6= 6y/6=y Is this correct help i need help!!

simplify: square root (4/3)-square root (3/4) A. 2-sqaure root(3)/2 square root (3) B. square root (7/12) C. square root (3)/6 D. 2/square root (3) which answer? this is what i got square root (16/12)- square root (9/12)= square root (7/12)

simplify: (y+1)(y/1-y^2) which answer: A. Y/y-1 B. y/1-y C. y+1/y-1 D. -1 this is what i got y+1/1* Y/1-y^2=-1

if 3abs(x+4)=8, then x=? A. {-10,2} B. {-2,2} C. {-19,11} D. {-22,-14} which one? idek

if 1-1/x=2-2/x, then 3-3/x=? A. -3 B. -1/3 C. 0 D. 1/3 E. 3 idek how to do it?

4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center of the circle and what is it's radius? A. center (2,3) radius=1/4 B. center (2,3) radius=1/2 C. center (-2,-3) radius=1/4 D. center (-2,-3) radius=1/2

4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center of the circle and what is it's radius? A. center (2,3) radius=1/4 B. center (2,3) radius=1/2 C. center (-2,-3) radius=1/4 D. center (-2,-3) radius=1/2

The cooling system in an automobile holds 10.0 L of ethylene glycol antifreeze. How much energy is absorbed when the temperature of the ethylene glycol goes from 20°C to 100°C? The density and specific heat capacity of ethylene glycol are 1.11 g/mL and 2....

Given that P=(-1,8) and Q=(-2,1), find the component form and magnitude of the vector 3 PQ.

Lily and Rose are playing the game in the game each player starts with 0 points

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

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

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!

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...

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...

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...

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

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

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!

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

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

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...

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.

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

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...

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

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

THANKS!!! You ROCK!!!

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...

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.

Nvm, I figured this out myself. :)

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

So, what is your question/problem with this?

(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

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

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.

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

None of the links explain three models of mental illness

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

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...

NaNO2 + HSO3NH2 = NaHSO4 + H2O + N2

Yes, thank you so much.

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

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

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

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

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

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...

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

buying and selling

So your saying the answer is Bargain?

so is it sell or bargain?

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

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?

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...

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

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

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

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

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

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

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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.

Alright, thank you for your response!

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...

@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.

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

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

Why is it three pi r squared?

From that, I got C.

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

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

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...

Thanks Randomthing 100%

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

i am doing it now

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,...

tell me when im correct

yes it is correct :)

i am giving away an xbox gift card for 25 dollars

some need grading

who plays Roblox

EDDIE MUNSON DIES IN STRANGER THINGS 4 PART 2

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

MY NAME IS DEREK