A 300-Kg Bear Grasping a Vertical Tree Slides Down at Constant

question 55

Multiple Choice

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.

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Definitions:

Community Immunity

Also known as herd immunity, it is the resistance to the spread of a contagious disease within a population that results if a sufficiently high proportion of individuals are immune to the disease, especially through vaccination.

Type A Blood

A blood group within the ABO system characterized by the presence of A antigens and anti-B antibodies in the plasma.

Antibodies

Antibodies are protein molecules produced by the immune system in response to foreign substances, helping to fight off infections.

Periodontitis

A serious gum infection that damages the soft tissue and destroys the bone that supports teeth, possibly leading to tooth loss.