Answer:
28.75 %
Explanation:
porosity is the term which is defined as the volume of voids present in the soil to the total volume of the soil.
it is denote by n where
A porous material is one which contain pores, if a material is porous it will allow the water to pass through it.
the porosity of the gravel sample is 28.75%
If the object is at equalibirium, then the force is balanced. '<em>Balanced</em>' is the key word that is used to describe equilibrium situations. If the object has a zero net force, the acceleration is 0 m/s/s. Objects at equilibrium should have an acceleration of 0 m/s/s.
The concept required to solve this problem is that related to the Isobaric process. Isobaric process is understood as the process in which changes occur at constant pressure. From the first law of thermodynamics this can be expressed as,
Here,
P = Pressure
dV = Differential of Volume
As the Pressure is constant we have,
Replacing
Therefore the correct answer is A.
Thomson proposed the "plum pudding" model - randomly scattered positive charges and negative charges held in a sphere
Rutherford disagreed with Thomson with his gold foil experiment - proposed that at the centre of an atom was a dense, positive mass and around it were very small negative charges called electrons