[Azred]

Originally posted by Faceman: Assuming you are driving in a very nice sports car (any of the Italian V12s fore example) at top speed. What would the cinetic energy of the car be? How long could you as a human sustain on that energy? (You may approximate or use your actual values).

Let's use 1750 kg for the mass of the car travelling at 200 kph. Kinetic energy is (1/2)*mass*(velocity^2). 200 kph = 55.556 m/s, so the energy is 2,700,660.49 (kg * (m/s)^2); 1 joule = 1 (kg * (m/s)^2). 2,700,660.49 joules = 645.46 kcal. A good diet is 2500 cal/day, so that many calories would equal about 258 days. [img]graemlins/saywhat.gif[/img] A new diet, perhaps? [img]graemlins/laugh3.gif[/img]

Originally posted by Faceman: How big (and filled with what gas) should a baloon or Zeppelin so that upon his explosion (and after a cooldown) there'd be a noticeable rainfall over a major city (e.g. New York).

[img]graemlins/erm.gif[/img] I'll have to browse the CRC to look for gases that are both lighter than air and have condensation points below...say, what is the ambient air temperature at the time of the explosion, anyway? We would need temperature and pressure readings every 1000 ft (300 m), since these have a direct effect on the gas being used; of course, we could assume a simple gradient between readings using linear interpolation.
Many, many variables there....