Was the first tonal method to be used enabling half-tones to be produced.
a. aquatint
c. mezzotint
b. engraving
d. drypoint

Let us define each word first:

·         Aquatint is a method of etching a printing plate do that tones similar to watercolor washes can be reproduced.

·         Mezzotint is manner of engraving on copper or steel by scraping or burnishing a roughened surface to produce light and shade.

·         Engraving is the art of cutting something into the surface of wood, stone or metal.

·         Drypoint is an engraving made with a steel or jeweled point directly into the metal plate without the use of acid as in etching.

Therefore, Aquatint was the first tonal method to be used enabling half-tones to be produced.

The right answer is C (mezzotint) on e2020

Explanation:

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

true tan speed = ang vel x radius