An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
The question asks for the number of US troops in Vietnam by 1969.
Based on historical data, the number was approximately 500,000.
Comparing with the given options, 500,000 is the correct answer.
Therefore, the answer is 500 , 000 .
Explanation
Problem Analysis We are asked to determine the number of US troops in Vietnam by 1969 from the given options. The options are 50,000, 100,000, 500,000, and 1,000,000.
Historical Data Based on historical data, the number of US troops in Vietnam by 1969 was approximately 500,000.
Comparison Comparing the historical data with the given options, the closest match is 500,000.
Final Answer Therefore, the number of US troops in Vietnam by 1969 was 500 , 000 .
Examples
Understanding historical troop deployments helps in analyzing the scale and impact of military conflicts. For example, knowing the peak troop levels in Vietnam allows historians and policymakers to assess the resources committed and the potential effects on both the US and Vietnamese societies. This knowledge is crucial for informed discussions about the consequences of war and strategic decision-making in future conflicts. It also provides a basis for comparing different military engagements and their respective impacts.
In 30 seconds, an electric device delivering a current of 15.0 A allows approximately 2.81 x 10^{21} electrons to flow through it. This is calculated by first determining the total charge using the formula Q = I × t and then calculating the number of electrons based on the charge of a single electron. Therefore, the final answer is about 2.81 x 10^{21} electrons.
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