Register to reply

Newtons cradle

by phlegmy
Tags: cradle, newtons
Share this thread:
Nov3-07, 12:34 PM
P: 119
hey dudes

i read in a book that when an electric current flow that the electrons move preety slow [maybe 1mm/s i'm not sure]
now i also know electricity travels at the speed of light (ideally) so that an electron c*1s away will take 1s to start moving after i close the circuit

so i was thinking about a newtons cradle
if the moving ball hits the next ball at say .05m/s and all the balls add up to .05m then obviously it wont take a full second for the last ball to move, so how fast does the "impulse"? move through the stationary balls . i've a feeling its the speed of sound (in the medium of the balls) is that right?
Phys.Org News Partner Physics news on
Researchers demonstrate ultra low-field nuclear magnetic resonance using Earth's magnetic field
Bubbling down: Discovery suggests surprising uses for common bubbles
New non-metallic metamaterial enables team to 'compress' and contain light
Nov3-07, 12:46 PM
P: 22,281
It is indeed the speed of sound.

Register to reply

Related Discussions
Newtons cradle Introductory Physics Homework 4
Newtons cradle Classical Physics 5
Newtons cradle velocity Classical Physics 3
Newton's cradle Classical Physics 2
Newton's cradle General Physics 4