It depends both on the type of wood you're using, and what is weighing down the ends.
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Simple ..put equal weight at each end, equal distance from the pivot.
No, not safe; if supported on each end it is likely to break
That completely depends on how much solution you need to end up with.If the solution is to be 1,000 ppm by weight (or mass), then you add 1 gramof KCl to each liter of water.
1 gram of asparagus = 1 gram of feathers Weight is equal to all things meaning if you have a 1lb of one item...its is 1 lb the item you getting the weight from makes no difference. It is different when you are getting the weight of an item if you are getting said weight in different locations i.e. the moon. In the end your weight is done by a scale and you can probably figure this one out.
The bible says , before the end there will hailstone the weight of a talent . Which is 72 pounds .