A Piece of Iron Sinks to the Bottom of a Lake

question 72

Multiple Choice

A piece of iron sinks to the bottom of a lake where the pressure is 21 times what it is at the surface. Which statement best describes what happens to the density of that piece of iron?

• A) There has been no change in the density of the iron.
• B) Its density becomes 1/21 what it was at the surface.
• C) Its density decreases slightly.
• D) Its density increases slightly.
• E) Its density becomes 21 times greater than what it was at the surface.

---

Definitions:

Average Variable Cost

The per unit cost of variable inputs divided by the total quantity of output produced, reflecting the variable cost of production.

Marginal Revenue

The additional income generated by increasing product sales by one unit.

Marginal Cost

The expense associated with manufacturing an extra unit of a product or service.

Economic Activity

Actions that involve the production, distribution, and consumption of goods and services at all levels within a society.