We have that the density of the fluid is

From the question we are told that
object of volume 0.0004m^3
density 6000kg/m^3
fluid of density 5000kg/m^3.
Force F=0.7N
Generally the equation for the Force is mathematically given as

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To solve the problem we will require the concept of Force as a definition of pressure and Area, and the concept of light pressure itself determined by the relationship between intensity and the speed at which light travels. We will match the terms and find the desired force value,

Here,
P = Pressure
A = Area
Pressure due to the light of the sun will be

Here,
I = Intensity
c = Speed velocity
Equation both therms we have that

We have a circular area then

Replacing with our values (Adding the radius of the Earth)


Therefore the Force on Earth due to radiation pressure is 
Answer:
the atom cannot be divided into smaller particles
electrons orbit around the center of the atom
Answer:
Explanation:
Given
Temperature of gas 
Volume of gas 
no of moles of gas 
Using Ideal gas Equation to find the Pressure of gas

where P=Absolute Pressure
V=Volume
R=Universal gas constant
T=Temperature



And we know Atmospheric Pressure is 
Therefore Gauge pressure is given by


