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1 second = (1/60) 0.0166666 minutes
Length of the rope, speed at which the pendulum is moving, friction between the rope and the air, the rope and its suspension point, and within the rope itself.
0.4 minutes, or 2/5 minutes. 24 seconds doesn't make any minutes. It's 6 seconds less than half a minute. A minute is 60 seconds.
There were 13880 days, including 10 days in leap years from 1975 to 2012. That makes 1,199,232,000 seconds. However, during this period there were 21 leap seconds, so the correct answer is 1,199,232,021 seconds.
(1 hour) x (3,600 seconds per hour) / (90m seconds per article) = 40 articles