No, not strong enough to weigh a 50 pound object.
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It depends. They weigh equally if 2 blocks weigh as much as 1 marble. If 2 blocks are heavier, 10 blocks > 5 marbles If 1 marble is heavier, 10 blocks < 5 marbles
Scale
A scale.
There are varying estimates, but approximately an estimated 6.6 sextillion tons. Of course, that is if you could put the Earth on scale, which you can't of course.
It could be used to measure capacity. For example, weigh an empty container. Then fill the container with water and weigh it again. Take the difference in weight. Divide by the density of water. This will give you the capacity of the container.