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Data from the Chernobyl incident:

No deleterious effects of radiation could be observed in locations where radiological doses were less than or equal to 5 rad/year. Where doses between 5 and 400 rad/year were received, radiation effects were 'ecologically masked,' meaning that adverse effects on individual organisms were observed but no changes in populations or ecosystems occurred. Where doses were >400 rad/year, damaging effects on populations and communities occurred.

Cited source

Average yearly (300 mars days) radiation levels GCR dose rate at Gale Crater on Mars: .21 mGy*, (.021 rem) per day, or (365 * .021 to account for our reference which is per earth year) = ~7.6 rem/earthYear.

*Cited source

Handy conversion calculator

So yeah, if I put all that together properly, not as much of an issue as I'd thought at all.

So I go to this site, and I get these conversions:

Naptha; 1,200 Gal = 6,900 lbs
Kerosene; 3,700 Gal = 25,000 lbs
Diesel (as fuel Oil); 6,900 Gal = 51,000 lbs
Fuel Oil; 3,00 Gal = 23,000 lbs

Total: 168,000 pounds; 84 tons.

84% efficiency. Not counting the ash.

Or not.

Like how I comma everything? Metric is overrated...

Glad someone else remembers that too I was starting to doubt my sanity. They are carry on as if cars have never been more fuel efficient which is bullshit. I remember by dad's car did 18 km per litre the unit used in those days. This is 42 mpg in US units or 5.55 litre per 100 km. (Thank you http://www.convert-me.com/en/convert/fuel )

Also cars those days had a little light or lights on the dash showing how economic you were driving. I believe it came on when the vacuum in the carburettor reached a certain value. Cars back then were marketed for their low aerodynamic drag and economy. Now the car shape is sole determined by fashion. Do they still use wind tunnels for cars? Where have those fuel economy warning lights gone? My Holden/Vauxal/Opel Vectra uses 9 liter per 100 km on average (26 mpg ) which is a shocking performance compared to cars from more than 3 decades ago.

ergo

Watts. http://www.convert-me.com/en/convert/units/power/p ower.kgfmpersec.en.html

Yep, 19557807593.984J is right if your speed is correct.

1 metric tonne TNT is 4612070452.51237J according to this page.

So it is 4.24 tonnes of TNT, i.e., the energy of a very large conventional explosion, eg, a blockbuster bomb from WWII. Nothing near a nuke though, which is kT to MT.

This is all from kinetic energy though, no explosives on Deep Impact.

1000 ft/sec * 3600 sec/hour * 12in/ft * 2.54cm/1in * 1km/1x10e5 cm = 1097 km/hour. Or equal to 0.3048 km/sec. Check out convert-me.com for all your unit conversion needs.
Naturally any object slows down if there's nothing acting on it except friction and I wouldn't try using a pellet gun much past 50 yards, but the rifle velocities I got from loadammo and according to them the muzzle velocity of a .223 is 3330 ft/sec and 2865 at 100 yards. I don't have a value handy for the .223 at 1000 ft, but I find it very hard to believe that it would drop to 333ft/sec in only another 700 feet.