Identify each energy exchange as primarily heat or work and determine whether the sign of E is

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Identify each energy exchange as primarily heat or work and determine whether the sign of ΔE is positive or negative for the system.

a. A rolling billiard ball collides with another billiard ball. The first billiard ball (defined as the system) stops rolling after the collision.

b. A book falls to the floor. (The book is the system.)

c. A father pushes his daughter on a swing. (The daughter and the swing are the system.)

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