Answer:
4
Explanation:
As you can see in the free body diagram there are 4 forces acting on the body.
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 
<span>covex object and concave eyepiece.</span>
Popcorn can be popped by either of the three forms of heat transfer:
Conduction in a pan with hot oil on a stove element.
Convection by an air popper and warm air rising over a heating element... no direct contact with heat source.
Radiation is what occurs in a microwave. Invisible radiant heat activates water molecules in the popcorn.
All the above heat the kernel over 100 Celsius. Water vaporizes/boils (latent heat) and erupts through the kernel.
Mmmm popcorn watch out for the lipids (fat in the oil and butter)