When was the existence of the neutron confirmed?
a. in ancient times
b. in 1895
c. in 1932
d. in 1969
c
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Two point charges are on the x-axis. One charge, 
is located at the origin, and the other charge, 
is located at x = 9.00 m. What is the force on 
?
A. 20.0 nN in the positive x-direction B. 20.0 pN in the positive x-direction C. 20.0 nN in the negative x-direction D. 20.0 pN in the negative x-direction E. 180 nN in the positive x-direction
Laplace's nebular hypothesis was problematic in that he could not explain ____
a. the different types of planets b. the rotational direction of the planets c. how the Sun had <0.5% of the Solar System's angular momentum d. how one star could come within a close encounter of another star e. how gravity was the dominant force of planet formation
What kind of object do we think lies in the center of the Milky Way Galaxy?
A) a 3- to 4-million-solar-mass black hole B) a gigantic X-ray binary system C) a dense cluster of young, hot stars D) an enormous collection of dark matter, which explains why we detect no light at all from the galactic center
White light hitting white paper is an example of
A) absorption. B) transmission. C) reflection or scattering. D) emission.