The formula for net force is mass times the acceleration of an object.
F = ma
Where: m = mass
a = acceleration due to gravity (9.8 m/s^2)
F = Force
If you are pertaining to gravitational force, the acceleration of gravity is what you will consider which is 9.8 m/s^2
Now, you are given only the volume and density. We know that Density is mass over volume:
[tex]Density = \frac{mass}{volume} [/tex]
Using this we can extract a formula for mass:
[tex]Density x volume = mass[/tex]
The volume of your block is 0.09[tex] m^{3} [/tex] and your density is 4000[tex] \frac{kg}{ m^{3}} [/tex]
Now input that into our formula:
[tex]4,000 x 0.09 = mass[/tex]
[tex]360kg = mass[/tex]
Now that we know that mass = 360kg, we can now solve for our force.
F = ma
F = (360kg)(9.8m/s^2)
F = 3,528 N
The answer is then D.
