An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
A device with a current of 15.0 A delivers approximately 2.81 × 1 0 21 electrons over a period of 30 seconds. This is calculated by first finding the total charge delivered and then converting that charge into the number of electrons using the fundamental charge of a single electron. The final result reveals a significant flow of electrons in a short duration.
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The program takes arrow_head and arrow_body as input.
It prints a right-facing arrow pattern.
The arrow consists of five lines with specific arrangements of arrow_head and arrow_body .
For arrow_head = 'x' and arrow_body = 'y' , the output is:
x
xxxxxxy
xxxxxxy
xxxxxxx
x
Explanation
Understanding the Program The program takes two string inputs, arrow_head and arrow_body , and uses them to print a right-facing arrow pattern. The arrow is constructed using string concatenation and repetition. Let's analyze the given example with arrow_head = 'x' and arrow_body = 'y' .
First Line The first line prints two spaces followed by the arrow_head . In our example, this will be x .
Second Line The second line prints the arrow_head repeated six times, followed by the arrow_body . In our example, this will be xxxxxxy .
Third Line The third line is identical to the second line, printing the arrow_head repeated six times, followed by the arrow_body . In our example, this will be xxxxxxy .
Fourth Line The fourth line prints the arrow_head repeated six times, followed by the arrow_head . In our example, this will be xxxxxxx .
Fifth Line The fifth line prints two spaces followed by the arrow_head . In our example, this will be x .
Final Output Combining all the lines, the final output is:
x
xxxxxxy
xxxxxxy
xxxxxxx
x
Examples
This exercise demonstrates how to use string manipulation to create patterns. String manipulation is a fundamental skill in programming, useful for tasks such as formatting text, generating reports, and creating visual displays. By understanding how to concatenate and repeat strings, you can create complex and dynamic outputs. This is applicable in various fields, from web development to data analysis, where presenting information in a clear and structured manner is essential.
