**(664.2 km) **· (1,000 m/km) · (100 cm/m) =

(664.2 · 1,000 · 100) (km·m·cm/km·m) =

**66,420,000 cm**

Work is done when a force is applied to an object moves that object. the work is calculated by multiplying the force by the amount of movement of an object

<h2>Answer: Molecular diffusion
</h2>

Molecular diffusion is the process of **mass transfer** as a result of a **concentration difference in a mixture**.

This process is related to the t<u>hermal movement of the particles and their velocity</u>, which is a function of the temperature, the viscosity of the fluid and the size of the particles. This is how diffusion controls the net direction of the molecular flow from a region of <u>higher concentration </u>to one of <u>lower concentration</u>, **as long as there is a difference (or gradient) of concentration**.

**Answer:**

The force of gravity on an object increases with its mass; thus, the acceleration of gravity is constant.

**Explanation:**

one can prove this by plugging in values to Newton's 2nd law equation

F = ma, or by using the formula to calculate the force of gravity.

Force of Gravity = GMm/r^2

with G being the gravitational constant, M the mass of the earth, m the mass of the falling body, and r the distance from the earth's center.

Force of Gravity can be written as mg, with g being the acceleration due to gravity.

As we can see, m cancels on both sides, leaving

g = GM/r^2

Generally in physics problems, r will be treated as constant to achieve

g = 9.8m/s^2

**Answer:**

Total energy produced 19135.362 MJ/year

**Explanation:**

**given details:**

total energy produced = 2090 Btu per hour

1 Btu = 1.055kJ

Total energy produced per year in mega joule is = 2090*1.055 *365*24

= 19315362 KJ/year

In mega joule per year

mega joule per year = 19135.362 MJ/year