A 100-G Block of Copper Is Taken from a Kiln

question 47

Multiple Choice

A 100-g block of copper is taken from a kiln and quickly placed into a beaker of negligible heat capacity containing 300 g of water.The water temperature rises from 15°C to 40°C.Given c_Cu = 0.10 cal/g·°C,and c_water = 1.00 cal/g·°C,what was the temperature of the kiln?

• A) 500°C
• B) 635°C
• C) 790°C
• D) 535°C

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Definitions:

Operating Profit Margin

A profitability ratio calculated as operating income divided by revenue, indicating the percentage of revenue that is left over after paying for variable costs of production.

Cost of Goods Sold

Expenses directly incurred from the production of a company's sold goods, involving the cost of labor and materials.

General and Administrative Costs

Expenses related to the day-to-day operations of a business that are not directly linked to production or sales.

Gross Profit Margin

A financial metric indicating the percentage of revenue that exceeds the cost of goods sold; it measures how efficiently a company uses its labor and supplies in production.