Monday
July 6, 2015

Posts by j


Total # Posts: 784

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

Astronomy
not sure
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

Physical Chemistry
Calculate the value of the change in enthalpy(H) when the temperature of 1 mole of a monatomic gas is increased from 25C to 300C.
March 4, 2012

algebra
how to make a 4x4 magic sqaure which equals 18
February 27, 2012

Physics
The string of a conical pendulum is 54.5 cm long and the mass of the bob is 0.22 kg. a) Find the angle between the string and the horizontal when the tension in the string is three times the weight of the bob. b)Under those conditions, what is the period of the pendulum?
February 26, 2012

Physics
A mass m1 on a horizontal shelf is attached by a thin string that passes over a frictionless pulley to a 2.5 kg mass (m2) that hangs over the side of the shelf 1.2 m above the ground. The system is released from rest at t = 0 and the 2.5 kg mass strikes the ground at t = 0.82 ...
February 26, 2012

chemistry
12.2
February 22, 2012

Physics
(b) What is the acceleration of the ball if an upward force of 64 N is applied?
February 20, 2012

math
a shot is released at a height of 1.89m, with a speed of 13m/s and at an angle of 34 degrees. Calculate the maximum height reached and the time at which this occurs, the range and the time of flight, and the optimum projection angle.
February 16, 2012

biomechanics
a shot is released at a height of 1.89m, with a speed of 13m/s and at an angle of 34 degrees. Calculate the maximum height reached and the time at which this occurs, the range and the time of flight, and the optimum projection angle.
February 16, 2012

physics
A tiger leaps horizontally from a 15.0 m high rock with a speed of 7.10 m/s. How far (in meters) from the base of the rock will it land? so using the equation h=1/2 gt^2 and i put in 15 for h and g is 9.8 so i solve for t. is this right and when do i use the 7.10 m/s
February 14, 2012

physics
so does that mean vf is zero, vi is 29.69848481, and g is 9.8
February 14, 2012

physics
A golfer drives a ball with a velocity of 42 m/s at an angle of 45 degrees above the horizontal. What is the maximum height (in meters) of the ball above the level fairway?
February 14, 2012

physics
so h is 15, g is 9.8 15= 4.9t^2 then take the square root of 3.061. then do i multiply by 15?
February 14, 2012

physics
is g negative or positive, because that is what i did and the answer is still wrong!
February 14, 2012

goverment
Federal regulatory agencies have responsibility primarily in the area of
February 13, 2012

Physics
A circular automobile racetrack is banked at an angle theta such that no friction between road and tires is required when a car travels at 28.0 m/s. If the radius of the track is 390 m, determine theta .
February 11, 2012

calculus
Parametrize the curve of intersection of x = -y^2 - z^2 and z = y.
February 8, 2012

Chemistry
What is the empirical formula if given c-.1929 h-.01079 o-.08566 cl-.1898
January 30, 2012

chemistry
The electrochemical cell described by the balanced chemical equation has a standard emf (electromotive force) of -4.05 V. Calculate the maximum electrical work (kJ) the cell has done if 6.8500 mol of F2(g) (Molar Mass - 38.00 g/mol) forms. Round your answer to 3 significant ...
December 4, 2011

Chemistry
Thank you so much :)
December 3, 2011

Chemistry
If the initial concentration of NH3(g) is 4.643 mol/L, calculate the % of NH3(g) left over after the reaction reaches equilibrium according to the balanced equation. The value of Kc at 773.0 K is 16.70. The initial concentration of the reaction products is 0 mol/L. 2NH3(g) = ...
December 3, 2011

physics
2.7
November 20, 2011

Physics 1
12000j
October 20, 2011

math
112-49=63 63/(7+7) = 63/14 =4.5 4.5+ (8-2)^2 4.5+ 6^2 40.5 jeeze this was easy,how old are you, 3??
October 19, 2011

physics
you can use the max height for parabloic path equation.look it up on google you lazy bum!
October 19, 2011

physics
the answer is dragonballs....simple as that.
October 19, 2011

Science
When plants die, what happen to carbon dioxide? They would be more co2 or less?
October 18, 2011

Math
Round 50.4 square miles to the nearest Square mile
October 13, 2011

Science (Chemistry
ad
October 11, 2011

Math
Construct a grouped frequency distribution for the following 28 scores using a class width of 4: 64 63 58 46 52 62 47 49 56 47 43 41 45 51 60 62 51 61 50 55 56 53 54 58 48 48 58 46
October 10, 2011

physicsssss
1- d= 270 2- speed= 73
October 9, 2011

physics
-2.7 cm/s
October 9, 2011

Physics 1
A mass of 5.2 kg lies at the top of a frictionless incline. It is inclined at an angle such that the normal force on the mass is 29 Newtons. If the length of the incline is 78 meters and the mass is originally at rest at the top of the incline and then released, how long does ...
October 4, 2011

Physics 1
A mass of 5 kg lies on a frictionless, horizontal floor. A force of 135 Newtons is applied to the mass at an angle above the positive x axis and a force of 14 Newtons is applied to the mass at an angle of 22.8 degrees below the negative x direction (see sketch). If the angle ...
October 4, 2011

chemistry
What is the specific heat capacity of a metal if it requires 176.1 J to change the temperature of 15.0 g of the metal from 25.00°C to 30.00°C?
October 4, 2011

math
three men and their wives were given $5400. the wives together received $2400. sue had $200 more than jan, and ellen had 200 more then sue. who was married to whom?
September 28, 2011

math
a box of munchkins contains chocolate and glazed donut holes. if Gloria ate 2 chocolate , then 1/11 of the remianing munchkins would be chocolate. if she added 4 glazed to the box, 1/7 of the box would chocolate. how many munchkins are in the original box?
September 28, 2011

math
peg spends $7.50 a week for grapefruit. When grapefruit are out of season, she gets 1 fewer grapefruit than when they are in season. If the price decreases by $3 per dozen in season, how many dollars will it cost her to buy a dozen grapefruit out of season?
September 28, 2011

Physics help!
F= ma= Tension-Weight ma+Weight=Tension (4125kg)(0.0300 * 9.8)+ (4125kg)(9.81)=Tension Calculate and this will give you the answer for maximum force. For part (2) You have to subtract them (ma-weight)
September 26, 2011

geometry
This circle has a circumference of 56. What is the radius of the circle?
September 21, 2011

math
describe all the numbers when rounded to 312,000
September 8, 2011

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