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A claw-hammer can be used to lever out nails from a plank of wood.
First, the stone sinks because of the weight, the wood would probably be much lighter than the stone.Second, the density. The stone is much more dense than the wood
the weight of the water will be more because the wood if floting on top if the water
When you break a plank the length of plank from the break point to the nearest end acts as a 'leaver' the longer the leaver the greater the mechanical efficiency. Therefore a long plank will be easier to break (provided you try and break it near the middle).
45 lbs.
it can hold as much weight as it can handle
Not enough information to answer, too many variables.
That would depend on the thickness of the plank. It would also vary, depending on the type of wood, and where you buy it (what country, for instance).
That depends upon the size of the joists & grade/species of wood
The plank was of wood, a few inches wide
wood, metal, plastic, cheddar, matchsticks it really depends on how much weight you want it to hold
A plank.
ramp
More information is needed. The plank has a length, width and height and you only gave 2 dimensions. Also we would need something like the density of the plank.
That would depend on the specie of wood that the 2x8 is made from.
Board.
board