What is the method of preparing the powder?

if you're asking what comes out, it's steam.

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.