Author Question: Is so-called empty space really empty? A) Yes, because conservation of energy forbids the ... (Read 197 times)

brutforce · **on:** Jul 29, 2018

Is so-called empty space really empty?

A) Yes, because conservation of energy forbids the spontaneous creation of matter or radiation.
B) Yes, because nothing exists other than particles and empty space.
C) No, because of random quantum fluctuations.
D) No, because neutrinos are always present at every point in the universe.
E) No, because all space is filled with a physical substance known as ether.

Question 2

A 2.0-m rope is lying on a table. You pick up one end and start raising it vertically. How high above the table is the center of mass of the rope when half of the rope has lifted off the table?

A) 0.25 m
B) 0.50 m
C) 0.75 m
D) 1.0 m
E) 1.5 m