According to Archimedes’ principle, the buoyant force
A. is equal to the mass of the object
B. is always greater than the weight of the object
C. is equal to the weight of the displaced fluid
D. is less than the weight of the displaced fluid if the object sinks
C. is equal to the weight of the displaced fluid
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The _____ is a geologically brief period about 540 million years ago during which fossil evidence indicates Earth life became complex and diverse
A) Cambrian explosion B) Paleozoic era C) Renaissance D) Ordovician
Induction: 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.
What percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?
A) 20 percent B) 0.1 percent C) 80 percent D) 0 percent E) 2 percent
The energy that flows in a sound wave is:
1.kinetic energy only. 2.potential energy only. 3.both kinetic and potential energy. 4.heat energy. 5.thermal energy. 6.all of the above.