Author Question: What is the main source of benzene? a) Benzene is obtained from coal tar, a by-product of soft ... (Read 133 times)

P68T · **on:** Jul 28, 2018

What is the main source of benzene?
a) Benzene is obtained from coal tar, a by-product of soft coal.
b) All benzene is synthetic, that is, man-made.
c) Benzene is obtained from petroleum.
d) Benzene forms as a product of incomplete electrolysis.

Question 2

Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (2, 2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
a. (3, 1) m
b. (+1, +3) m
c. (+3, 1) m
d. (1, 3) m
e. (0.5, 2) m