[填空题]
The Sun's gravitational btp /mb,:b9k28ks7 +j)q*smf v i+i2vljqdhapull on the Eqzv qx4dk2 tj(11-chparth is much larger than the Moon's. Yet the Moon's is mainly responsible for the tides. Explain. [Hint: C1qvq(c tj4d zxk1-p 2honsider the difference in gravitational pull from one side of the Earth to the other.]A child sitting 1.10 m from the center of a merry-go-round moves with a speed of 1.25 $\mathrm{~m} / \mathrm{s}$ . Calculate (a) the centripetal acceleration of the child,
(b) the net horizontal force exerted on the child ( mass =25.0 $\mathrm{~kg}$)
