Question

PLs help me with the questions in the reply BOX!

Answer 1

Hi and welcome to QuestionCove!
This certainly is an interesting way to format your question. I'll try to address each one in turn.

For the problem involving the load on the lever, the farther away from the fulcrum the effort is compared to the load, the less effort will be necessary to lift the load. This is a proportional relationship, based on the same proportion as the respective distances between effort to fulcrum and load to fulcrum
So, effort is twice as far from the fulcrum compared to the load, the force needed to lift the load should be half as much as the weight of the load itself. So, how much is half of 100 N?

Answer 2

Atmospheric pressure at sea level is, by definition, 1 atmosphere. I'll leave it up to you to convert this into other units, if necessary.
In general, as altitude increases, atmospheric pressure decreases. I think this is due to the reduced force of gravity, as objects get further from the surface of the planet, but I may be mistaken about this.

Answer 3

In order to calculate pressure in Pascal units, simply take the force (in Newtons) divided by the area on which the force is exerted (in meters squared).
For this problem, you can solve 10N / 5m^2, yes? The result of that calculation will be the pressure in Pascals.