Monday

October 24, 2016
Total # Posts: 964

**chemistry**

If after precipitation of the Group I cations as chlorides by the reaction with HCl, nearly all of the precipitate dissolves in the hot water, what ion is most probably present and which ions are most probably absent?

*July 22, 2012*

**physics**

the motion of a particle along a straight line is described by the function x=(2t-3)^2 where x is in metres and t is in seconds. A)find the position ,veocity and acceleration at t=2 sec. B) find the velocity of the particle at origin.

*June 26, 2012*

**Physics**

Find the forces exerted by the two supports of a 4.0m, 50-kg diving board when a 60-kg woman stands at its end. The two supports are 0.8m apart. This time consider the mass of the diving board.

*June 24, 2012*

**physics**

A car starts from rest and travels for 6.3 s with a uniform acceleration of 2.3 m/s2. The driver then applies the brakes, causing a uniform acceleration of −1.9 m/s2. If the brakes are applied for 2.6 s, how fast is the car going at the end of the braking period?

*June 7, 2012*

**Calculus**

Find the shortest distance between the two skew lines L1 and L2 with equations r = [1,2,2] + s [4,3,2] and r = [1,0,-3] + t [4,-6,-1]

*May 26, 2012*

**Calculus**

Find the shortest distance from a point P(2,-1,2) to a line L r= [-1,0,7] + t [4,1,-2].

*May 26, 2012*

**Calculus**

thanks reiny!

*May 26, 2012*

**Calculus**

7. Where does the line r = (1, 2, -5) + t (2, -3, 1) meet the plane 2x + 5y - 3z = 6?

*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 26, 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 26, 2012*

**Calculus**

thank you reiny, thats the answer i first got but i wasn't sure if it was right, thanks

*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 Grade 12 University**

for the #4 i got r = (5, -2, 3) + t(4, -3, 1) --- can you please help me on 5, 6, 7. instead since i got 4. thanks steve

*May 26, 2012*

**Calculus Grade 12 University**

thanks steve. do you know how to do these ones? :( 4. Write a vector equation of the line through the point (5, -2, 3) and parallel to the vector v=[4, -3, 1] 5. Determine an equation for the plane that is exactly between the points A(-1, 2, 4) and B(3, 1, -4). 6. Find out if ...

*May 26, 2012*

**Calculus Grade 12 University**

8. Find the vector equation of the line in which the 2 planes 2x - 5y + 3z = 12 and 3x + 4y - 3z = 6 meet.

*May 26, 2012*

**Calculus grade 12**

7. Where does the line r = (1, 2, -5) + t (2, -3, 1) meet the plane 2x + 5y - 3z = 6?

*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 26, 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 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*

**intro to ethics - philosophy**

Some arguments have complex premises, where too much information is given. Outline the following argument.? Some matters of foreign policy are just beyond George W. Bush’s grasp, for, like in the matter of the prison in Iraq where that female soldier had her pictures ...

*May 16, 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*

**Astronomy**

not sure

*May 7, 2012*

**cheistry**

For 6th grade its 3 questions and for 7th its 4 :D AND IM GUESSING FOR 8 ITS 5 :D XD

*May 6, 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*