An unknown material is left standing and separates into layers. the substance is a

a. solution

b. suspension

c. compound

d. colloid

Colloid

Explanation:

A suspension comprises of a substance that is dispersed in a liquid. Colloid may result when oil is mixed with water. In colloid , the other substance is merely scattered in a another and form a lower layer when the colloid is left to stand. A dispersion oil in water is called an emulsion. It is a type of colloid.

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.