Recent content by kevykevy

Homework Statement 10% of the keyboards a computer company manufactures are defective. 3 keyboards come off the assembly line. Determine the probability distribution, where x=the number of defective keyboards. What would the expected number of defected keyboards be? Homework Equations...

Homework Statement Given the plane x + ky + 2z - 9 = 0, find k if the plane makes an angle of 60 degrees with the plane 2x + 2y - z = 0. Homework Equations The Attempt at a Solution I'm stumped on this question. No idea of even how to start this one.

to radou - basis vectors, example i, j, and k with the carot(^) on top

Cross Product a x b = (1, 4, 5) Dot Product (1, 4, 5) x (8, 5, -2) = 18 Since 18 doesn't equal 0, then the vectors cannot be used as basis vectors is that right?

Homework Statement Determine whether the the vectors a = (2, -3,2), b = (1, 1, -1) and c = (8, 5, -2) can be used as a basis for vectors in R^3 (3D space) Homework Equations The Attempt at a Solution I really have no clue, I think maybe you use either cross product, dot product...

am i supposed to use new points D, E, and F? or should i use the circumcentre P?

Homework Statement In triangle ABC, with vertices A(0,a), B(0,0) and C(b,c) prove that the right bisectors of the sides meet at a common point (the circumcentre). Homework Equations Midpoint(x1 + x2 / 2 , y1 + y2 / 2) Length of a Line The Attempt at a Solution I was thinking of...

Homework Statement A plane wave generator with a freqenecy of 60.0Hz creates a water wave of wavelength 3.0cm in region A of a ripple tank. The angle between the wave crests and straight boundary between regions A and B is 25.0 degrees in region A and 14.0 degrees in region B. Find the speed...

Actually, how would I solve that if there is 3 unknowns: mass, velocity, and charge?

So, since I don't know what the mass is or the speed, would I split the question up into two parts, the first being at collision so I can solve for mass since speed is zero. Then I can use the law of conservation of energy to find velocity at start?

Question - Two protons, separated by a large distance, are fired directly at each other. The closest approach in this head-on collision is 3.0 x 10^14 m. One proton starts with two times the speed of the other. Assuming there is no delection from the original path, determine the initial speed of...

Also, how do I find the direction of the field? Do I have to use some sort of x and y component breakdown?

Find the magnitude and direction of the net electric field at the centre (or centroid) of the triangle. The triangle is equilateral and the point of reference is in the middle of the triangle. What I want to know is what equation do I use to figure this out? At first I thought it was...

I tried again and found my mistake, so my final answer is: x = 0.571428571 m Correct?

k so I'll have: (9x10^9)(6x10^-6)(q3)/x = (9x10^9)(1.5x10^-5)(q3)/2 - x 54000(q3)/x = 135000(q3)/2 - x 54000/x = 135000/2 - x 108000/x = 135000/-x 108000(-x) = 135000(x) How do I solve from there? Did I make an algebraic...