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

question 74

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:

Marginal Cost

The financial outlay involved in producing a supplementary unit of a good or service.

Crude Oil

A naturally occurring, unrefined petroleum product composed of hydrocarbon deposits and other organic materials, used as a primary energy source.

Industry Output

The total production of goods and services produced by a specific sector of the economy over a given period.

Marginal Cost

The cost incurred from producing one additional unit of a good or service.