How many seconds are there in a year? Give your answer to three significant fiures.

Question

This is a dimensional analysis problem where you are required to convert days to hours, and then hours to minutes, and finally minutes to seconds without rounding off until the last step.

Answer 1

60×60×24=86400 (Sec in a day) let the number of days in a year be 365. 86400×365=31536000 ~=31500000 (Sec in a year, corr. to 3 s.f.)