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Small Vintage Grandfather Wall Clock, 8 Day Wind-up Mechanical Clock With Chime, German Movement, Pendulum Key Wind Clock, Oak Cabinet Cloc - Etsy

The pendulum of a grandfather clock activates an escapement mechanism every time it passes through the vertical. The escapement is under tension (provided by a hanging weight) and gives the pendulum a small impulse a distance l from the pivot. The energy transferred by this impulse compensates for the energy dissipated by friction, so that the pendulum swings with a constant amplitude. (a) What is the impulse needed to sustain the motion of a pendulum of length L and mass m, with an amplitude of

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