A 70-Kg Block on a Horizontal Frictionless Surface Is Attached to to a Light

question 41

Multiple Choice

A 7.0-kg block on a horizontal frictionless surface is attached to a light spring (force constant = 1.2 kN/m) . The block is initially at rest at its equilibrium position when a force of magnitude P acting parallel to the surface is applied to the block, as shown. When the block is 8.0 cm from the equilibrium position, it has a speed of 0.80 m/s. How much work is done on the block by the force P as the block moves the 8.0 cm?

• A) 7.4 J
• B) 5.4 J
• C) 6.1 J
• D) 6.7 J
• E) 4.9 J

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Definitions:

Fixed Costs

Fixed costs are expenses that do not change with the level of production or business activity.

Average-Fixed-Cost Curve

A graphical representation showing how the average fixed costs of production decrease as output increases, due to spreading fixed costs over a larger number of units.

Total-Cost Curve

A graph that shows the total cost of producing different quantities of a good or service.

Marginal-Cost Curve

A graphical representation that shows how the cost of producing one additional unit of a good varies as the production volume changes.