Recent content by marthkiki

Wait where does the magnitude of 3 N come into play? Shouldn't it be multiplied to 2j to get the total work? So you get W = F*AB AB = 2j F = 3(2i + j + 2k) = 6i + 3j + 6k F dot product AB = 0 + 6j + 0 = 6j. So the work should in fact be 6 Joules, correct?

s That may well be true. If so, is the correct answer 2? The displacement vector is 2j. (2i + j + 2k) dot product 2j = 0 + 2j + 0 = 2j. So the correct answer is 2 Joules, correct?

Positive. This really doesn't make any sense to me.

Homework Statement Find the work done by a force of 3 Newtons acting in the direction 2i + j + 2k in moving an object 2 meters from (0, 0, 0) to (0, 2, 0). Homework Equations Commonly known vector operations. The Attempt at a Solution I found the displacement vector to be 2j...

Thank you so much! I get it now. I totally squared the left wrong.

If i do that, I end up with x = 86612.49 and y = 4.165. I then end up with v^4 - y^2 = v^4 - x, which again gets me to -y^2=x.

If i do that, I end up with u = v2 + 416.2 then the discriminant will end up negative leaving me with an imaginary velocity. Did I do this correctly?

By squaring both sides, I get v^2 - 17.35 = v^4 - 86612.49. That gets me -17.35 = -86612.49. Is this what you mean by a false answer?

Homework Statement theta = tan^-1 {{v^2 - [v^4-g(gx^2)]}^1/2}/gx I know that x is 30, theta is 45, g is 9.81 m/sec^2. I'm trying to solve for v. Homework Equations The Attempt at a Solution I've gotten all the way down to v^2 = (v^4-86612.49)^1/2 + 4.165 What do I do from here?

After a while of trying to understand this, it's still kind of confusing. I get how the planets orbit around the sun because of the sun's spacetime curve, but if one were to drop something, how does spacetime curvature cause it to fall? How can everything in the universe have a gravitational...

Unify quantum mechanics and relativistic physics in a perfect theory.

I was watching this video, and it was saying that because the universe is expanding, the wavelengths of light waves were elongating, and therefore the energy of radiation throughout the universe is decreasing. They said that this defies the conservation of energy, but Einstein's general theory...