A 25-Kg Block on a Horizontal Surface Is Attached to a Light

question 31

Multiple Choice

A 25-kg block on a horizontal surface is attached to a light spring (force constant = 8.0 kN/m) . The block is pulled 10 cm to the right from its equilibrium position and released from rest. When the block has moved 2.0 cm toward its equilibrium position, its kinetic energy is 12 J. What is the change in mechanical energy caused by the frictional force on the block as it moves the 2.0 cm?

• A) −4.0 J
• B) −3.5 J
• C) −2.4 J
• D) −2.9 J
• E) −15 J

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Definitions:

Client-centered Therapy

A humanistic psychotherapy developed by Carl Rogers in which the therapist provides a supportive environment in which clients can re-experience and understand their feelings to facilitate personal growth.

Marriage Counseling

A type of therapy for couples seeking to resolve problems and conflicts, improve communication, and strengthen their relationship.

Spouse's Comments

Observations or statements made by one's partner or spouse, which can have significant emotional impact or influence on the relationship.

Active Listening

Empathic listening in which the listener echoes, restates, and clarifies. A feature of Rogers' client-centered therapy.