1. A wall clock has a second hand 23.0 cm long. What is the radial acceleration of the tip of this hand? Express the answer in centimeters per second squared.

2. A daring 51 kg swimmer dives off a cliff with a running horizontal leap, as shown in the figure below.

What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is L= 2.65 m wide and ? = 9.40 m below the top of the cliff?