A 20-G Bullet Is Fired into a 2

question 49

Multiple Choice

A 20-g bullet is fired into a 2.0-kg block of wood placed on a horizontal surface.The bullet stops in the block.The impact moves the block (+ bullet) a distance of 5 m before it comes to rest.If the coefficient of kinetic friction between the block and surface is 0.25,calculate the speed of the block (+ bullet) system immediately after impact.

• A)20 m/s
• B)3.5 m/s
• C)25 m/s
• D)5.0 m/s
• E)2.2 m/s

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Definitions:

Conscience

An inner feeling or voice viewed as acting as a guide to the rightness or wrongness of one's behavior.

Superego

A component of Sigmund Freud's psychoanalytic theory of personality, which represents the ethical or moral self, holding internalized societal norms and ideals.

Ego

In psychoanalytic theory, the part of the personality responsible for dealing with reality while balancing the demands of the id and superego.

Id

In psychoanalytic theory, the part of the psyche that is the source of instinctual impulses and demands for immediate satisfaction of primitive needs.