An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
The problem involves analyzing temperature data to draw conclusions about the absorbency and reflectivity of different materials.
Higher temperature indicates greater heat absorption and lower reflectivity.
Lower temperature indicates less heat absorption and higher reflectivity.
Comparing the temperatures, we find that Material W is less absorbent than Material Z, which is the best supported conclusion. M a t er ia l W i s l ess ab sor b e n t t han ma t er ia l Z .
Explanation
Understanding the Problem We are given a table of temperatures for four different materials after being placed under a heat lamp. The goal is to determine which conclusion about the materials' absorbency and reflectivity is best supported by the data. The key idea is that materials with higher temperatures absorbed more heat and are thus less reflective, while materials with lower temperatures absorbed less heat and are more reflective.
Analyzing the Data Let's analyze the given data:
Material W: 87°F
Material X: 99°F
Material Y: 75°F
Material Z: 105°F
Evaluating the Conclusions Now, let's evaluate each of the given conclusions:
Material W is less absorbent than material Z.
Material W has a temperature of 87°F, and Material Z has a temperature of 105°F. Since Z's temperature is higher, it absorbed more heat, meaning W is indeed less absorbent than Z. This statement is supported by the data.
Material Y is the least reflective.
Material Y has the lowest temperature (75°F), meaning it absorbed the least heat and is therefore the most reflective, not the least. This statement is not supported by the data.
Material X is more reflective than material W.
Material X has a temperature of 99°F, and Material W has a temperature of 87°F. Since X's temperature is higher, it absorbed more heat and is less reflective than W. This statement is not supported by the data.
Material Z is the least absorbent.
Material Z has the highest temperature (105°F), meaning it absorbed the most heat and is therefore the most absorbent, not the least. This statement is not supported by the data.
Final Answer Based on the analysis, the conclusion that is best supported by the information in the chart is: Material W is less absorbent than material Z.
Examples
Understanding heat absorption and reflection is crucial in many real-world applications. For example, choosing the right color for your clothing on a sunny day can significantly impact your comfort. Darker colors absorb more sunlight and heat, making you feel hotter, while lighter colors reflect more sunlight, helping you stay cooler. Similarly, the materials used in building construction are selected based on their ability to absorb or reflect heat, which affects the building's energy efficiency and internal temperature. Reflective roofing materials can reduce cooling costs in hot climates by reflecting sunlight away from the building.
The best-supported conclusion from the data is that Material W is less absorbent than Material Z. This is indicated by their respective temperatures, with Z being significantly higher, meaning it absorbed more heat. Therefore, the correct choice is option A.
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