and 5 feet wide? how strong would someone be if they could lift it above there head
Aluminum can't be soldered.
Aluminum solder is usually a zinc alloy and it might stick to copper,but I would try a marine epoxy.
This is never a good procedureThese 2 metals like to eat each other in a process called electrolysis The exception to this is if the metals are both in a petroleum fuel, like gasolineFor this, try JB Weld.
Standard concrete weight is normally considered to be 150 lb per cubic footConcrete with cinder aggregate can run in the range of 90 to 110 lb per cubic footWill use 100 lb per cubic foot for calculations hereinIt will also be assumed the block is solid and does not have any cores or hollow spots since this information has not been providedThe height and width were given but the depth was not providedAssuming the block is 7' x 5' x 5': the volume would be 175 cubic feet175 cubic feet times 100 lb per cubic foot would equal 17,500 lbsDivided by 2,000 lb per ton would equal 8.75 tonIf the block is 7' x 5' x 1', the volume would be 35 cubic feet35 cubic feet times 100 lb per cubic foot would equal 3,500 lbsDivided by 2,000 lb per ton would equal 1.75 tonTo lift either of these blocks above their head someone would have to be stronger than any seven or eight of the strongest weight lifters in the worldBut if they used a crane or a forklift or similar help they would be able to easily lift it above their head with just slight pressure of one fingerAs you can see a lot depends on the size and configuration and lifting equipment to be usedLets say someone could lift 500 lbs above their head which would be a bunchIf the block was 7' x 5' x 1.5 inches 7' times 5' times 1.5 divided by 12 would equal 4.375 cubic feet which would equal 437.5 lbsThe someone would still have to be a weight lifter to, without help, lift this above their head.
