Which of these hypothetical observations (none of them are real) would force us to reconsider our modern, Sun-centered view of the solar system?
a. We discover a small planet beyond Saturn that rises in the west and sets in the east each day.
b. We find that we are unable to measure any parallax for a distant galaxy.
c. We discover an Earth-sized planet orbiting the Sun beyond the orbit of Pluto.
d. We discover that the universe is actually contracting, not expanding.
Answer: a. We discover a small planet beyond Saturn that rises in the west and sets in the east each day.
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If the atoms are in irregular arrangements, the material is ______________.
Fill in the blank(s) with the appropriate word(s).
A heavy dart and a light dart are launched horizontally on a frictionless table by identical ideal springs. Both springs were initially compressed by the same amount
Which of the following statements about these darts are correct? (There could be more than one correct choice.) A) The darts both have the same kinetic energy just as they move free of the spring. B) The lighter dart leaves the spring moving faster than the heavy dart. C) The heavy dart had more initial elastic potential energy than the light dart. D) Both darts move free of the spring with the same speed. E) Both darts had the same initial elastic potential energy.
Two long bar magnets are aligned so that north poles face each other. The magnets are separated by 1 cm, and a repulsive force between the north poles is 0.04 N. When the separation is increased to 2 cm the force will be
A. 0.020 N. B. 0.050 N. C. 0.40 N. D. 0.025 N. E. 0.010 N.
Molecular Vibration: If a diatomic quantum mechanical vibrator in its ground state has energy E, what is its energy in its second state above the ground state?
A. E. B. 3E. C. 5E. D. 7E. E. 9E.