A Block of Mass M_b Rests on a Horizontal Surface

question 27

Multiple Choice

A block of mass m_b rests on a horizontal surface and is accelerated by means of a horizontal cord that passes over a frictionless peg to a hanging weight of mass m_w. The coefficient of kinetic friction between the block and the horizontal surface is µ and the tension in the cord is T. The acceleration of the block is given by

• A) T - m_wg)/m_w + m_b).
• B) T/µm_bg + m_b).
• C) T - µm_b)/m_b.
• D) m_wg - T)/m_w.
• E) T/m_b - µm_bg.

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Definitions:

Hierarchical Approach

The theory that semantic memory consists of hierarchical networks of interconnected concept nodes.

Subordinates

Individuals who are lower in rank or position in an organizational or hierarchical structure.

Short-Term Store

A temporary storage facility where information is modified to create a more meaningful experience.

Spreading Activation

A theory in cognitive science suggesting that thoughts and ideas in memory are connected; activation of one concept triggers nearby or related concepts.