A 186-Kg Block Is Held in Place Against the Spring by by a 81-N

question 8

Multiple Choice

A 1.86-kg block is held in place against the spring by a 81-N horizontal external force (see the figure) . The external force is removed, and the block is projected with a velocity v₁ = 1.2 m/s upon separation from the spring. The block descends a ramp and has a velocity at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.28. The velocity of the block is v₃ = 1.4 m/s at C. The block moves on to D, where it stops. The height h of the ramp is closest to

• A) 11
• B) 7.3
• C) 15
• D) 17
• E) 18

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Definitions:

Ecological Approach

A perspective within psychology and other social sciences that emphasizes the importance of understanding individuals in the context of their physical and social environments.

Interdependence

A mutual reliance between two or more groups or people, where each is dependent on the others for certain needs or outcomes.

Mental Health

Narrowly, the absence of disorder. In a broader view, the presence of optimal social, emotional, and cognitive functioning—also known as wellness.

General Risk Factors

Conditions or variables associated with an increased likelihood of developing a disorder, illness, or other negative outcomes.