Recent content by GrantB

Sorry, it was a mistype. It should say: The planet has constant angular velocity as it orbits. You move at a constant speed towards the planet, and want to move in a straight line. So, you want to get to the planet, and you are at an arbitrary point a distance d from the planet, moving only...

Suppose you are at a point (x0,y0) in space. There is a planet at position (x1,y1) orbiting in a circle a distance r away from the orbit center (x2,y2). The planet has constant angular velocity as it orbits. You move at a constant speed towards the planet, and want to move in a straight line...

Okay I looked it up, and found that they combine so that the spin projection cancels and are spin-0. Sorry I had to ask some menial stuff from you, my book doesn't spend any time going into detail about these things. There was no mention of the photons :[ Thanks for the help.

So if the pion has s=0 but gamma has s=1, why does the pion decay to two gammas but not to one?

Homework Statement Which of the following reactions are forbidden and why? \pi^{0}\rightarrow\gammaHomework Equations None? The Attempt at a Solution I'm pretty sure that the decay doesn't occur (it's forbidden) but I don't know why. I know that it decays most of the time into two gammas...

Ahh, thank you. I am getting an answer of 2.5x108 when the answer is 2.4x108. Although, I think its a rounding (error) somewhere since what I'm doing seems correct. Thanks!

I'm running into a problem. When I take e-qV/kT-1 for the reverse bias it gives me a negative number.

Homework Statement An ohmmeter is sometimes used to determine the "direction" of a diode by connecting the ohmmeter to the diode one way and then reversing the ohmmeter leads. If the ohmmeter applies an emf of .5V to the diode in order to determine resistance, what would be the ratio of...

Yeah I believe you will have to use the Law of Cosines. You should be able to find the angle between the windless-plane and the wind-plane. Glad I could be of help :]

Suppose I run on a surface that can move under me. If I run at 10km/h east, and the surface moves me southeast as I run, from my reference frame, what does my vector look like? In other words, what would the vector of the plane look like without any wind? I would start there. Then I would deal...

Hello :) Acceleration is a rate of change of velocity, where velocity is a rate of change of position. If I run in a 100m race, and finish in 10 seconds, my velocity is how fast I go from beginning to end. In this case it is: v = \frac{finish-start}{time} = 10m/s In this case, the...

The direction should have nothing to do with the result. The mass of the Earth, its size and rate of spin are all the same.

There is a point on the rod where the mass to the left equals the mass on the right. He chose an arbitrary point where this is the case. Setting the integrals equal to each other and solving like you did for total mass, then using Algebra you should be able to solve for x0.

Yes. Think about it like this: What is the slope of the parabola at its maximum? It appears as though you are just trying to throw equations together, and work backwards, to get the answer. Take a minute and think about the problem.

Looks like a typo of some sort to me. Maybe they meant to ask how much the electric field increases by.