Recent content by vaizard

For example, if one end of a rope is attached to a wall, and the other end is attached to the floor (at an angle), if I pull straight up on the rope, would that exert a force on the wall?

Hi, I'm trying to figure out how you can calculate motional EMF when the velocity of the object in question is not perpendicular to the magnetic field. There are two equations in my textbook, but the text describing them is not very helpful. The first is \varepsilon = vBL, which can be...

Thanks a lot, that worked perfectly! I would have never thought of that! When I completed part B, I got an answer of \sim 0.48 \, \AA for the radius, which is close enough to a_0 = 0.529 \, \AA

Yeah, I thought of that too, but once again, you need the radius to find the force by that method.

Homework Statement In the classical Bohr model of the hydrogen atom, the nucleus has one positive electronic charge Q_n = e = +1.602E-19 Coulombs and the single electron (mass = 9.1E-31 kg and Q_e = -e = -1.602E-19 C, one negative electronic charge) orbits the nucleus in a circular orbit. In...

Yes, that's the problem, but I think I'm starting to get it. What's being measured is the Earth, right? And therefore, the Earth bound observer is the one that measures the proper length.

Homework Statement Two loudspeakers are set up 4.0 meters apart and are driven in phase by the same amplifier. The listener is located a sufficient distance away so the angle to the listener is approximately the same at each speaker as indicated in the drawing. The speed of sound is 344 m/s...

Does this mean that 38 km is the proper length?

Homework Statement A primary cosmic ray (which comes from elsewhere in our Galaxy) hits the nucleus of an atom in our atmosphere 38 km above the ground and creates an unstable secondary particle, which then travels straight down toward the ground at a speed of 0.99400c. (The altitude and the...

So when the string is vertical and in equilibrium with a mass hanging from it, there is a certain force exerted downwards by the mass and that same force exerted upwards by whatever the top end of the string is attached to?

Hi, I've got a quick question about tension. If there is a force applied to both ends, the total tension is the sum of those forces, right (i.e., they don't cancel each other out)? TIA!