The 26,000 year cycle that changes the poles and equinoxes is called
A) precession.
B) the Earth's rotation.
C) a retrograde loop.
D) revolution.
E) regression.
A
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Projectile Motion: A ball rolls over the edge of a platform with only a horizontal velocity. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20 m. What is the horizontal velocity of the ball just before it touches the ground? Neglect air resistance.
A. 35 m/s B. 9.8 m/s C. 20 m/s D. 4.9 m/s E. 70 m/s
________ and ________ are common in regions where subduction occurs.
A. Volcanoes; plate spreading B. Auroras; the Coriolis effect C. Mountains; earthquakes D. Rifts; polarity shifts
In Bohr's model of the atom, electrons:
A) only make transitions between orbitals of specific energies. B) are not confined to specific orbits. C) are spread uniformly through a large, positive mass. D) can be halfway between orbits. E) move from orbit to orbit in many small steps.
An efficient step-up transformer increases
A) power. B) energy. C) both of these D) none of the above