A 12-Kg Mass Is Projected Down a Rough Circular Track (Radius

question 6

Multiple Choice

A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m) as shown. The speed of the mass at point A is 3.2 m/s, and at point B, it is 6.0 m/s. What is the change in mechanical energy done on the system between A and B by the force of friction?

• A) −8.9 J
• B) −7.3 J
• C) −8.1 J
• D) −6.6 J
• E) −24 J

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Definitions:

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A defense mechanism where reasoning is used to block confrontation with an unconscious conflict and its associated emotional stress, where thinking is used to avoid feeling.

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The process of teaching a young child to control their bladder and bowel movements and to use the toilet for elimination.

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