An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
Analyze the problem and identify that the question asks for the number of calories in 1 gram of protein.
Note that the correct value is 4 calories, but this is not among the options.
Acknowledge the discrepancy and state that without a correct option, a precise answer cannot be given.
Conclude that based on the provided options, it's impossible to determine the correct answer.
Explanation
Problem Analysis The question asks for the number of calories in 1 gram of protein. We need to identify the correct value from the options provided.
Identifying the Correct Value The options provided are 9, a, 8, and 2 ∘ . We know that 1 gram of protein contains 4 calories.
Addressing Discrepancies However, none of the options are correct. It seems there might be a typo in the question, or the options are misleading. Assuming the question meant to ask for the closest value, we can consider the options.
Final Answer Since none of the options are correct, let's assume the question contains a typo and one of the options is the correct answer. The closest numerical value to the actual value (4 calories) is not present in the options. Therefore, it is impossible to provide a correct answer from the given choices.
Examples
Understanding the caloric content of macronutrients like protein is essential for designing balanced diets. For example, if you are planning a meal with 50 grams of protein, knowing that each gram provides approximately 4 calories allows you to calculate the total caloric contribution from protein (50 grams * 4 calories/gram = 200 calories). This information is crucial for managing energy intake and achieving specific dietary goals, such as weight loss or muscle gain.
To calculate how many electrons flow through a device with a current of 15.0 A for 30 seconds, we first find the total charge, which is 450 coulombs. Then, using the charge of a single electron (1.6 x 10^{-19} C), we find that approximately 2.81 x 10^{21} electrons flow through the device. This highlights how a significant current can involve an immense number of electrons.
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