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Stranded on the moon for 7 days?
I need some help here. I'm taking an astromony class and I can't figure out which one of these is important. I'm stranded on the moon for 7 days and I need to survive. I have to list from 1-15 of things that are the most important. 1 being the most and 15 being the least. Also I need an explanation to each one as to why it should be this ranking.
Here are the items:
50 ft of nylon rope
Two 110 pound tanks of oxygen, enough of a supply to last for 5 days
One box of wooden matches
Food concentrate
Parachute silk
Portable heating unit
Two .45 caliber pistols
One case of dehydrated Pet brand milk
Stellar map (of the constellations as they appear on the Moon)
Life raft
Magnetic compass
5 gallons of water
Signal flares
First aid kit containing injection needles
Solar-powered FM receiver-transmitter
Remember rank them from 1-15 and I need an explanation for each.
Anyones help would be appreciated 
Box of matches No oxygen to sustain flame, virtually worthless 15
Food concentrate Efficient means of supplying energy requirements 4
Fifty feet of nylon rope Useful in scaling cliffs, tying injured together 6
Parachute silk Protection from sun's rays 8
Solar-powered portable heating unit Not needed unless on dark side 13
Two .45 caliber pistols Possible means of self-propulsion 11
One case of Pet milk Bulkier duplication of food concentrate 12
Two 100-pound tanks of oxygen Most pressing survival need 1
Stellar map (of the moon's constellations) Primary means of navigation 3
Self-inflating life raft CO2 bottle in military raft may be used for propulsion 9
Magnetic compass Magnetic field on moon is not polarized; worthless for
navigation 14
5 gallons of water Replacement for tremendous liquid loss on lighted side 2
Signal flares Distress signal when mother ship is sighted 10
First-aid kit injection needles Needles for vitamins, medicines, etc., will fit special aperture in NASA space suits 7
Solar-powered FM
receiver-transmitter For communication with mother ship; but FM requires
line-of-sight transmission and short ranges 5
These are the correct answers, I did this is class one time.
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