A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is
A) 30 N.
B) 300 N.
C) 3000 N.
D) more than 3000 N.
C
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In order, the largest wind power producers are:
a. China, India, Spain, United States, Germany b. Germany, China, United States, Spain, India c. United States, India, Spain, Germany, China d. China, United States, Spain, Germany, India e. Denmark, United States, China, Germany, India
A frothy volcanic rock with so much void space that it can actually float is called
a) Obsidian b) Tephra c) Pumice d) Lava e) Tuff
The transfer of heat from molecule to molecule within a substance is called ____
A) conduction B) convection C) radiation D) latent energy
Relationships between weather or climate patterns at two widely separated locations are called ________
Fill in the blank(s) with the appropriate word(s).