How do you multiply the mass in kilograms by the gravitational acceleration?

-- Find out the mass, in kilograms.
Write down the number, with the unit "kg" after it.

-- Find out the gravitational acceleration where you are.
If you are on Earth, then it's 9.8 meters per second squared.
Write down the number, with the unit " m/s² " after it.

-- Multiply the two quantities you have written down. 
Multiply the numbers and write down their product.
Write the unit " kg-m/s² " after it.

-- If you wish, you may replace the unit ' kg-m/s² '
with its equivalent unit: ' Newton '.

The result of this operation is a force.

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.