By definition, the addition of oxygen to a substance is called
a. neutralization.
b. reduction.
c. oxidation.
d. displacement.
c
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Why do astronomers believe Triton may have been a planet that was captured by Neptune?
A) It orbits Neptune in the opposite direction of Neptune's rotation. B) It is too large to have been formed in the jovian nebula that formed Neptune. C) It has an atmosphere and a measurable greenhouse effect. D) It undergoes seasonal changes. E) It is colder than any other moon or planet.
An object of mass 5.0 kg revolves at 600 rpm in a horizontal circle of radius 1.5 m. Determine the
a) period of the object's motion in seconds, b) object's speed, c) magnitude of the centripetal acceleration, d) magnitude of the centripetal force acting on the object.
An individual's eye pupil changes from a diameter of 3.5 mm to 1.4 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
a. 0.5 b. 0.71 c. 2.2 d. 2.5 e. 4.9
The star Aldebaran is a red giant, and is much more luminous than the Sun. What conclusions can be drawn from this fact?
A. In the H-R diagram, Aldebaran is above and to the left of the Sun. B. Aldebaran is cooler than the Sun, but has larger diameter than the Sun. C. Aldebaran is a binary star. D. Aldebaran is hotter and much more massive than the Sun. E. None of these choices is correct.