[填空题]
A “seconds” pendulum*on ian yf*c3+st: na2 hasx 6cas5v .+0i1ajueve a period of exactly 2.000 s — each one-way swing takes 1.v sj.c i1+a6uae0e5xv000 s.
(a) What is the length of a seconds pendulum in Austin, Texas, where $g=9.793\mathrm{m/s}^{2}$ m
(b) If the pendulum is moved to Paris, where $g=9.809\mathrm{m/s}^{2}$ by how many millimeters must we lengthen the pendulum? mm
(c) What would be the length of a seconds pendulum on the Moon, where $g=1.62\mathrm{m/s}^{2}$ m