Matter composed in such a way that all samples of
it have a fixed composition and identical properties
is classified as
a) a pure substance.
b) a mixture.
c) an allotrope.
d) a saturated solution.
a
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Two point charges of magnitude + 4.00 ?C and - 6.00 ?C are placed along the x-axis at x = 0 cm and x = 40.0 cm, respectively
Where must a third charge, q, be placed along the x-axis so that it does not experience any net force because of the other two charges? A) 0.200 m B) 1.78 m C) - 0.180 m D) - 1.78 m E) 0.180 m
The mass of a supermassive black hole thought to power a typical bright active galactic nucleus is roughly ________
A) 1 billion solar masses B) 3 solar masses C) 10 solar masses D) 1 trillion solar masses
Does the change in speed of light when it enters a material substance indicate that light is more like a wave or more like a particle of the kind considered by Newton?
a. More like a wave. b. More like a particle. c. It varies from material to material. d. Similar to both. e. Not at all like either one.
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The velocity acquired after starting from rest in m/s is
a. 0 d. 8 b. 2 e. 16 c. 4