Here's how to calculate the force of gravity acting on the steel block:

1. Calculate the mass of the block:

* Density = Mass / Volume

* Mass = Density * Volume

* Mass = 7840 kg/m³ * 0.08 m³ = 627.2 kg

2. Calculate the force of gravity (weight):

* Force of gravity (weight) = Mass * Acceleration due to gravity (g)

* Force of gravity = 627.2 kg * 9.8 m/s² = 6148.16 N

Therefore, the force of gravity acting on the steel block is approximately 6148.16 Newtons.