To double the period of oscillation of a simple pendulum
Options
A. the mass of its bob should be doubled
B. the mass of its bob should be quadrupled
C. its lenght should be quadrupled
D. its length should be doubled.
Correct Answer
its lenght should be quadrupled
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1. At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be :