[填空题]
The Sun's gravitational pull on the Earth is much l3svy hvn1*;dtte .:syarger than the Moon22kq72eov 5zupn hiw6 's. Yet the Moon's is mainly responsible foeun2v5kw7p zhoq226ir the tides. Explain. [Hint: Consider 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 $\mathrm{~kg}$)
