About 220 lb.
20,000 tons
It looks like that on average, fiberglass ladders hold 225-300 lbs, while metal ladders hold 300-500 lbs, so if you need a lot of weight capacity, I would go with the metal ladder.
When made out of cardboard? About ten kilos.
Depends on the structural integrity of the deck.
The weight limits of fiberglass ladders are variable. Most are capable of carrying somewhere between 200 to 300 pounds. However, one should check the manual of their specific ladder for the most accurate number.
A square foot of Plexiglas can hold no water. It is a flat sheet. A cube of Plexiglas would be needed.
The answer will depend on 4 inch slab of what material!
The maximum recommended weight for a normal loft ladder is 150 kg. Bear in mind that, as with any ladder, if you are carrying things up or down, the maximum weight includes any additional items and weight.
That would depend on the specie of wood that the 2x8 is made from.
it can't hold very much weight
12 cubic feet
what it the average weight of a 7 foot slate pool table