A grandfather clock consists of a mass of 0.1 Kg attached to the end of a rod of length 0.9940 m. To keep correct time, its period of oscillation should be exactly 2 seconds. However, the clock is observed to run too fast by 18 minutes per week.
(a) By how much should we adjust the mass or length of the pendulum so that the clock keeps correct time ?
Please show your work.