Contact Definition and 417 Threads

A 50g golf ball is struck w a club. the ball leaves the face of the club w a velocity of 44m/s Pf = mvf = (50 x 10^-3 kg) (44 m/s) = 2.2 kg m/s From this I must find the contact time t = change in x /average velocity The change in x in the radius of the ball .05m The average velocity...

Contact forces and action-at-a-distance forces... Are all contact forces the result of action-at-a-distance forces? After all, surely it all boils down to electrostatic repulsions, etc? Thanks in advance.

How much radiation comes in contact with the martian surface? where can i find more info on this? thanx.

Is there any real distinction between forces by contact and forces in distance?

A block is on a piston that is moving vertically with simple harmonic motion. a)At what amplitude of motion will the block and piston sperate if the period of the piston's motion is 1.18 seconds? b) If the piston has an amplitude of 5.12 cm in its motion, find the maximum frequency for which the...

Can anyone tell me why friction does not depend on the area of contact??

I have one Question to ask Explain briefly the Difference between direct and indirect contact with electrical equipment. [100 words] thnx

This problem seemed very straightforward but I've somehow missed something... Three blocks (M1, M2, M3) are in contact with each other on a frictionless, horizontal surface. A horizontal force is applied to M1. If M1= 1.67kg, M2= 2.67kg, M3= 3.78kg, and F= 16.1 N: a) what is the...

Would it be possible that Opticians will be selling to visually impaired people, Contact Lens, made from a material that has a negative index refraction, that theoretically could be altered with a Liquid Crystal "Eye-Drop" solution? Basically how far are we from a Liquid Crystal Contact Lens...

Hi, I have a problem that talk about the behavior of two liquids in contact and a boundary that appears between them. I am lack of theory about this situation do anyone of you could help me to find some paper of articles that talk about this? Thank you, Aron

Hi, I'm working on a kinematics problem of rolling a golf ball on a flat plane (4-position infinitesimally separated solution). The solution sought is to be planar, so we're working in 2D only. This is largely irrelevant though, as I'm facing a rather undergraduate puzzler. I need to...

If you tap on a desk, or are walking, does that energy that is being transferred cause electrons in the desk or ground to jump oribitals and emit infrared light? Also, I've read that electrons never touch each other, and that there is actually some space between you and everything that you...

Given the relativism (conjecturism?) involved with the hypothetical existence of advanced humanoid worlds far older than ours (on a scale of perhaps billions of years), is it not feasible that our inclusion into this "Galactic Club" would give to humanity a significant evolutionary boost...

During the last week I've been reading Dirac. I browsed through his Quantum Mechanics and now I'm reading his Lectures on QFT. In both I found the term "contact transformation" and it seems he's the only one to use it because a few people at the faculty have heard about it but they can't give...

A recent paper details some new insights for the second quantized string field theory. This has some implications for future models, it appears to be quite sound, but this is based on a confined early viewpoint of a first once over reading, no doubt there will be more questions to follow...

does anyone know how i can contact michio kaku! it would be the best

how can (contact binary stars) exist? why is it that one does not destroy the other? where is there center of gravity?