A Metal Bar Is Used to Conduct Heat $\degree$ C and at the Other Is 20

question 19

Multiple Choice

A metal bar is used to conduct heat. When the temperature at one end is 100 $\degree$ C and at the other is 20 $\degree$ C, heat is transferred at a rate of 32 J/s. The bar is then stretched uniformly to twice its original length. If again it has ends at 100 $\degree$ C and 20 $\degree$ C, at what rate will heat be transferred between it ends?

• A) 4 J/s
• B) 8 J/s
• C) 16 J/s
• D) 32 J/s

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Definitions:

Micronutrient

Essential vitamins and minerals required by the body in small amounts for proper growth, development, and physiological function.

Phosphorus

A chemical element essential to all living organisms as part of energy-transferring molecules and structural compounds.

Hydroponics

Growing plants in an aerated solution of dissolved inorganic minerals (i.e., without soil).

Aerated Water

Water that has been infused with air or gas, often carbon dioxide, to create a bubbly or effervescent texture.