Recent content by SpicVir

Anyone?

Hello, my problem: A ball (assume its a point) is dropped from height h without initial speed, after some time of falling it will hit an inclined plane (at angle alpha to normal) and bounce off (see the pretty picture, i think it explains alot). Question 1: What is the force F? Question...

It looks to me like a cotton ball on a black and dusty surface photographed with a flash fired from the right side (causing the 'black trail').

Soon I should get an 250mm F3.5 Reflector (optical tube only). So i just need good quality mount and a camera. That just might be in my price range :biggrin: . Thanks for the info.

Well that's a lot of money in my book, for now at least. Who knows what the future holds, right?

So... Can I (amateur astronomer) detect extrasolar planets? I've seen some videos on how they are detected (by measuring radial velocity (I love this word:biggrin:) of that planet). But they said nothing about the instruments used in detecting these things. Can they be bought/made? I'm guessing...

Oh, well... Thanks. Would this happen without gravity? Man starts to walk and because friction (between him and the raft), he starts to rotate?

This is a question i thought about recently: If a man starts to walk on a raft standing still in the water (no friction between the raft and water), how will the raft move? I'm thinking this: Is this what would actually happen?