Thursday
August 21, 2014

Posts by J


Total # Posts: 717

Calculus
5. Determine an equation for the plane that is exactly between the points A(-1, 2, 4) and B(3, 1, -4).
May 26, 2012

Calculus
4. Write a vector equation of the line through the point (5, -2, 3) and parallel to the vector v=[4, -3, 1]
May 26, 2012

Calculus
6. Find out if the line r = (1, 3, 8) + t (-2, 5, 7) is parallel to the plane 3x + 4y - 2z = 1
May 25, 2012

Calculus
5. Determine an equation for the plane that is exactly between the points A(-1, 2, 4) and B(3, 1, -4).
May 25, 2012

Calculus
is it like this r = (5, -2, 3) + t (4, -3, 1) thats all i have to do for this question?
May 25, 2012

Calculus
how do i do that...
May 25, 2012

Calculus
4. Write a vector equation of the line through the point (5, -2, 3) and parallel to the vector v=[4, -3, 1]
May 25, 2012

Calculus
thank you steve :)
May 25, 2012

Calculus
3. Determine that the vectors u=[t, 4, 2t+1] and v=[t+2, 1-t, -1] are perpendicular, find the possible values of the contant, t.
May 25, 2012

Calculus
thanks Steve!
May 25, 2012

Calculus
2. Give that the vectors u=[2, t, -4] and v=[1, -3, t-4] are perpendicular, find the value of the constant, t.
May 25, 2012

Calculus
thanks steve!
May 25, 2012

Calculus
1. Find a unit vector which is perpendicular to both of the vectors m=[4, 2, -3] and n=[2, -3, 1]
May 25, 2012

spanish/help pleaseeeee
cuando yo era chica, mi vida era muy diferente. Yo nunca trabajaba, solo jugaba con mis amigas. Mis padres iban al trabajo y mis abuelos me cuidaban. Nosotros no teniamos un televisor, por eso nos divertiamos con la conversacion, los juegos y la musica,
May 24, 2012

Calculus
thanks
May 24, 2012

Calculus
t(t+2) + 4(1-t) - (2t+1) = 0 t = 1,3 like that?
May 24, 2012

Calculus
3. Determine that the vectors u=[t, 4, 2t+1] and v=[t+2, 1-t, -1] are perpendicular, find the possible values of the contant, t.
May 24, 2012

Calculus
thanks!
May 24, 2012

Calculus
You want u.v=0 2 - 3t - 4(t-4) = 0 t = 18/7 like that?
May 24, 2012

Calculus
2. Give that the vectors u=[2, t, -4] and v=[1, -3, t-4] are perpendicular, find the value of the constant, t.
May 24, 2012

Calculus
thank you !
May 24, 2012

Calculus
| i j k | | 4 2 -3 | | 2 -3 1 | = [-7,-10,-16]/9√5 like this? please check if it's correct, thanks MathMate
May 24, 2012

Calculus
1. Find a unit vector which is perpendicular to both of the vectors m=[4, 2, -3] and n=[2, -3, 1]
May 24, 2012

Maths
Dear Rainy, Shape is 300 * 300 so total 90000 sq feet. Now since u know the shape, can u pl guide abt the answer. Thank u v much in advance. J
May 22, 2012

Maths
How many trees can be planted in an area of 90000 sq feet if vertically 8 feet distance and horizontally 3 feet distance is to be kept? Pl show the method of calculations.
May 22, 2012

Calculus
Write a vector equation AND parametric equations of the line through the points A(6,-1,5) and B(-2,-3,6) direction vector = [8,2,-1] a vector equation r = (6,-1,5) + t(8,2,-1) use that to write the parametrics how do i write parametrics
May 17, 2012

Calculus
using cartesian vectors ** forgot to include that.
May 17, 2012

Calculus
determine the each resultant a) 10 km/h north followed by 8 km/h west b) 25 N at 10 degrees to the horizontal and 30 N horizontally.
May 17, 2012

Calculus
three forces each of magnitude 50 N, act in eastward, westward, and northwest directions, Find the resultant force.
May 17, 2012

Calculus
determine the angle between the planes 2x + 2y + 7z = 8 and 3x - 4y + 4z = 5
May 17, 2012

Calculus / a bit of physics
explain why a scalar equation of the line exists in 2-D space, but not in 3-D space.
May 17, 2012

Calculus
determine an equation for each plane a) contains the point A(6,2,3), B(5,1,-3), and C(5,7,-2) b) parallel to 2x + 6y + 4z = 1 and contains the point P(3,2,1)
May 17, 2012

Calculus
determine the angle between the planes 2x + 2y + 7z = 8 and 3x - 4y + 4z = 5
May 10, 2012

Calculus
explain why a scalar equation of the line exists in 2-D space, but not in 3-D space.
May 10, 2012

Calculus
determine an equation for each plane a) contains the point A(6,2,3), B(5,1,-3), and C(5,7,-2) b) parallel to 2x + 6y + 4z = 1 and contains the point P(3,2,1)
May 10, 2012

Calculus
how do i write the parametrics
May 9, 2012

Calculus
Write a vector equation AND parametric equations of the line through the points A(6,-1,5) and B(-2,-3,6)
May 9, 2012

Calculus
thankyou!
May 9, 2012

Calculus
Determine the vector u = AB and its magnitude, given A(3,7,-2) and B(9,1,5).
May 9, 2012

Calculus
thank you!
May 9, 2012

Calculus
Calculate the angle between u = [5,7,-1] and v = [8,7,8]
May 9, 2012

Calculus
thank you!
May 9, 2012

Calculus
Calculate the dot product of two vectors: m = [4,5,-1] and n = [6,-2,7]
May 9, 2012

Calculus
Find the total work done by a 15 N force in the direction of the vector [1,2,2], when it moves a particle from O[0,0,0] to P[1,-3,4] and then from P to A[7,2,5]. Distance is measured in metres.
May 8, 2012

Calculus
for this question, do i have to solve it? it just says interpret the results, does that mean only explain? im trying to solve it right now. i have: L1: [x,y,z]=[-1,1,0]+s[3,4,-2] L2: [x,y,z]=[5,9,-4]+t[2,3,1] First, cross product of the two directional vectors from both lines...
May 7, 2012

Calculus
Find the distance between the lines [x,y,z] = [-1,1,0] + s[3,4,-2] and [x,y,z] = [5,9,-4] + t[2,3,1]. Interpret the result.
May 7, 2012

Calculus
Isnt it 30 + 50 + 10 because 10* 1 is 10 so final is = 90
May 7, 2012

Calculus
could you help me calculate the second part also? thank you
May 7, 2012

Calculus
I don't understand it.. what is the final work done? Also, the arrows (< and >) are they actually supposed to be written as < and > or are they supposed to mean brackets ( ) or these brackets [] thank you
May 7, 2012

Calculus
Find the total work done by a 15 N force in the direction of the vector [1,2,2], when it moves a particle from O[0,0,0] to P[1,-3,4] and then from P to A[7,2,5]. Distance is measured in metres.
May 7, 2012

Calculus
We need the direction of their line of intersection? That's all the question mentioned... so is that still the correct answer? :/
May 7, 2012

Calculus
Find the vector equation of the line that passes through the point (2,-1,7) and is parallel to the line of intersection of the planes x + 2y - 3z = -6 and 3x - y + 2z = 4
May 7, 2012

Calculus
thank you :)
May 7, 2012

Calculus
Three forces of 5 N, 8 N, and 10 N act from the corner of a cube along its edges. Using Cartesian vectors, find the magnitude of the resultant force.
May 7, 2012

Calculus
Three forces of 5 N, 8 N, and 10 N act from the corner of a cube along its edges. Using Cartesian vectors, find the magnitude of the resultant force.
May 6, 2012

Calculus
Find the vector equation of the line that passes through the point (2,-1,7) and is parallel to the line of intersection of the planes x + 2y - 3z = -6 and 3x - y + 2z = 4
May 6, 2012

Calculus
how do i check that? that the components (z) match "automatically"
May 6, 2012

Calculus
is this a) First see that the two vectors are orthogonal: [4,8,-4].[-1,2,3]=-4+16-12=0 => orthogonal Next solve for s and t for each coordinate direction (x,y,z) 4+4t=1-s 7+8t=5+2s => s=-1, t=-1/2 and this b) Substitute into original equation: <4,7,-1>-<2,4,-2&...
May 6, 2012

Calculus
10. Consider the lines [x,y,z] = [4,7,-1] + t[4,8,-4] and [x,y,z] = [1,5,4] + s[-1,2,3]. a) Show that the lines intersect at the right angle. b) find the point of intersection. please and thanks!
May 6, 2012

Calculus
thank you!
May 5, 2012

Calculus
Does the line [x,y,z] = [-2,6,5] + t[3,2,-1] lie in the plane 3x - 4y + z + 25 = 0 ? Please show work.
May 5, 2012

Calculus
Explain why a line in three-space cannot be represented by a scalar equation.
May 5, 2012

Calculus
thank you :)
May 5, 2012

Calculus
Determine an equation for the line parallel to 2x + 6y + 4z = 1 and contains the point P(3, 2, 1).
May 5, 2012

Calculus
So the final answer for this one would be [x,y,z]=[6,10,1]+1[3,4,-1]=[9,14,0] ? Thank you!
May 5, 2012

Calculus
Where does the line [x, y, z] = [6, 10, 1] + t[3, 4, -1] meet the xy-plane?
May 5, 2012

Calculus
thank you! :)
May 5, 2012

Calculus
Could you please help me with this question though, I don't understand this one: Explain why a line in three-space cannot be represented by a scalar equation. thank you!
May 5, 2012

Calculus
Thank you! everything is clear :)
May 5, 2012

Calculus
I don't understand it still.. So is a) parallel and b) coincidental? Please help! :(
May 5, 2012

Calculus
Determine if the planes in each pair are parallel and distinct or coincident. a) 5x - 2y + 4z = 7 5x - 2y + 4z = -3 b) 7x - 3y - z = 9 21x - 9y - 3z = 27
May 5, 2012

Calculus
Explain why a line in three-space cannot be represented by a scalar equation.
May 5, 2012

Calculus
Hi bobpursley, I got 2 answers for a) but I'm not sure which one is correct, could you please help me determine which is correct? the first answer I got is posted in this question, the second answer I got is this one for part a) could you please help me for a) I got this ...
May 4, 2012

Calculus
1. a) Write the vector and parametric equations of the line through the points A(6, -1, 5) and B(-2, -3, 6). b) Find another point on the line in (a). ----- This is what I got for a) r = 6i-j+5k + t(-8i-2j+k) x = 6-8t y = -1-2t z = 5+t I need help with b)
May 4, 2012

Calculus grade 12
thank you :)
May 4, 2012

Calculus grade 12
Explain why three directional vectors of the plane cannot me mutually perpendicular .
May 4, 2012

Calculus grade 12
Determine an equation for the line parallel to 2x + 6y + 4z = 1 and contains the point P(3, 2, 1).
May 4, 2012

Calculus grade 12
Explain why three directional vectors of the plane cannot me mutually perpendicular .
May 3, 2012

Calculus grade 12
Determine an equation for the line parallel to 2x + 6y + 4z = 1 and contains the point P(3, 2, 1).
May 3, 2012

Calculus grade 12
thank you :)
May 3, 2012

Calculus grade 12
Determine an equation for the plane that contains the points A(6, 2, 3), B(5, 1, -3), and C(5, 7, -2).
May 3, 2012

Calculus grade 12
Steve, for a) I got this instead: vector equation: [x, y, z] = [6, -1, 5] + t[-8, -2, 1] parametric equation: x=6+t(-2) x=6-2t y=-1+t(-3) y=-1-3t z=5+6t is that correct? ...
May 3, 2012

Calculus grade 12
Can you please do b) Steve? Thank you.
May 3, 2012

Calculus grade 12
1. a) Write the vector and parametric equations of the line through the points A(6, -1, 5) and B(-2, -3, 6). b) Find another point on the line in (a).
May 3, 2012

African American Lit
Would the last stanza be an example of Naturalism? "Maud, who went to college, Is a thin brown mouse. She is living all alone In this old house."
May 2, 2012

African American Lit
For what I am trying to understand I am using these definitions: Realism- a faithful reproduction of reality and promotes awareness Naturalism- a harsher treatment of reality and realism Modernism- connecting realism and naturalism to today.
May 2, 2012

African American Lit
How is the poem 'Sadie and Maud' by Gwendolyn Brooks synonymous to Realism, Naturalism and Modernism?
May 2, 2012

PHYSICS
A catapult launches a rocket at an angle of 56.9° above the horizontal with an initial speed of 100 m/s. The rocket engine immediately starts a burn, and for 3.25 s the rocket moves along its initial line of motion with an acceleration of 28.1 m/s2. Then its engine fails, ...
April 25, 2012

Chemistry
I still dont understand what to do after setting the K= pO2^(3/2). What do you substitute into the O2?
April 6, 2012

algebra
Participants in a psychology experiment were able to memorize an average of M words in t minutes, where M = −0.001t3 + 0.1t2. Use the following graph.Estimate the number of words memorized after 14 min. m 20 / 18 / 16 / 14 / 12 / 10 / 8 / 6 / 4 / 2/02468101214161820t
April 5, 2012

math
Determine the water level inside a tank that has a diameter of 40 feet and contains 180,000 gallons of water?
March 26, 2012

RUBY MS
what is 8.3% of 132,000,000
March 23, 2012

Physics
A 83-kg fisherman in a 122-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.7 m/s as in the figure below. Neglecting water resistance, and assuming the boat is at rest before the package is thrown, find the velocity of the boat ...
March 19, 2012

Physics
An object has a kinetic energy of 244 J and a momentum of magnitude 24.9 kg · m/s. (a) Find the speed of the object. (b) Find the mass of the object.
March 19, 2012

Chemistry
my deltaGf was dGf=290.4kJ/mol i got K=1.69e18 as my answer and it was correct. still getting the equation wrong though :/
March 14, 2012

math
nicks class has 30 students. 2/5 of his class sings in the school chorus. how many students sing in the chorus?
March 13, 2012

physics
hb h
March 12, 2012

Physics
310
March 10, 2012

Finance
Suppose your bank account will be worth $4,200.00 in one year. The interest rate (discount rate) that the bank pays is 5%. What is the present value of your bank account today?
March 7, 2012

Finance
Suppose your bank account will be worth $4,200.00 in one year. The interest rate (discount rate) that the bank pays is 5%. What is the present value of your bank account today?
March 7, 2012

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