9. Given 60 seconds to a minute and 24 hours to a day, how many seconds are in one year?
Answer: A
There are 31,536,000 seconds in one year.
To calculate the number of seconds in one year, we multiply the number of seconds in a minute (60) by the number of minutes in an hour (60), the number of hours in a day (24), and the number of days in a year (365). This results in 60 x 60 x 24 x 365, which equals 31,536,000 seconds.
A) 31,536,000
This option is correct as it accurately represents the calculation of seconds in one year. Using the formula 60 seconds/minute x 60 minutes/hour x 24 hours/day x 365 days/year results in 31,536,000 seconds.
B) ########
This option does not provide a numerical value, making it impossible to evaluate. Therefore, it cannot be considered correct as it fails to represent any valid calculation regarding the number of seconds in a year.
C) 8,760
This option represents the number of hours in a year rather than the total number of seconds. Specifically, it is calculated as 24 hours/day x 365 days/year. Thus, while it is a relevant figure, it does not answer the question regarding the number of seconds.
D) 525,000
This option is incorrect as it significantly underestimates the total number of seconds in a year. The calculation does not align with the correct formula and results in a figure that is not reflective of the actual number of seconds over a full year.
Conclusion
The correct answer, 31,536,000 seconds, is derived from a straightforward multiplication of time units over a year. All other options either provide incorrect values or fail to address the question adequately, reinforcing that A is the only valid choice in this context.