## Search found 5 matches

Tue Nov 11, 2014 7:26 am UTC
Forum: What If?
Topic: What-If 0001: "Relativistic Baseball"
Replies: 167
Views: 120887

### Re: What-If 0001: Relativistic Baseball

Okay if we assume that it does mop up everything in its path (I agree that this is not a completely given yet). Then how is this heavily simplified scenario?: The ball is about a thousand times denser than air, so it will cover its first ball mass of air in the first thousand ball diameters, or abo...
Thu Oct 04, 2012 4:11 am UTC
Forum: What If?
Topic: What-If 0014: "Short Answer Section I"
Replies: 86
Views: 46769

### Re: What-if 0014: Short answer section.

But would the escaping air take the form of an expanding hemisphere or a conical jet? In the near-vacuum of the moon surface, it should be an expanding hemisphere. It can be modelled as a hole of radius r in a infinite plane separating two volumes, one held at atmospheric pressure, the other at vac...
Mon Aug 27, 2012 2:01 am UTC
Forum: What If?
Topic: What-if 0008: "Everybody Jump"
Replies: 155
Views: 49288

### Re: What-if 0008: Everybody Jump

Any two people who meet are unlikely to have a language in common weasel words. countries always teach their primary language in school. so, there is an approximately 40% chance that any person will speak either hindi or mandarin enough to make themselves understood. there is, independently, a furt...
Tue Aug 14, 2012 12:54 am UTC
Forum: What If?
Topic: What-If 0001: "Relativistic Baseball"
Replies: 167
Views: 120887

### Re: What-If 0001: Relativistic Baseball

The baseball has roughly 11 moles of carbon (6.6*10^13 more stuff) in a 7.5cm diameter (21 million times bigger). Air is roughly 1000 times less dense than a baseball. Rough calculations means for each 7.5cm of air the baseball passes through, we have about 6000 nuclei-nuclei collisions. A concrete...
Sun Jul 22, 2012 3:20 pm UTC
Forum: What If?
Topic: What-If 0001: "Relativistic Baseball"
Replies: 167
Views: 120887

### Re: What-If 0001: Relativistic Baseball

From LHC FAQ: "In the LHC, under nominal operating conditions, each proton beam has 2808 "bunches", with each bunch containing about 100 billion protons. Bunches of particles measure a few centimetres long and a millimetre wide when they are far from a collision point. However, as the...