A negatively-charged plastic rod is brought close to (but does not touch) a neutral metal sphere that is connected to ground
After waiting a few seconds, the ground connection is removed (without touching the sphere), and after that the rod is also removed. The sphere is now A) negatively charged.
B) positively charged.
C) neutral.
B
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The polarization axes of glasses for 3-D viewing are
A) vertical. B) horizontal. C) at right angles to each other.
The Devonian period is most noted for the
A) ability of certain fishes to breath air. B) ability of certain fishes to move onto land. C) first amphibians. D) great diversification of fishes—some developed lungs, some moved to land, and some became amphibians.
An automobile moving along a straight track changes its velocity from 40 m/s to 80 m/s in a distance of 200 m. What is the (constant) acceleration of the vehicle during this time?
a. 8.0 m/s b. 9.6 m/s c. 12 m/s d. 6.9 m/s e. 0.20 m/s
Seasons on Earth are caused by
A) Earth's axis tilt. B) Earth's varying distance from the Sun. C) Earth's varying orbital speed around the Sun. D) the gravitational influence of the Moon. E) the Sun's gravity.