<\/ins><\/p>\n\n\n\na)\tL\u1ef1c h\u1ea5p d\u1eabn g\u00e2y ra gia t\u1ed1c h\u01b0\u1edbng t\u00e2m cho c\u00e1c v\u1ec7 tinh, h\u00e0nh tinh \nchuy\u1ec3n \u0111\u1ed9ng xung quanh Tr\u00e1i \u0110\u1ea5t, xung quanh M\u1eb7t Tr\u1eddi. M\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p \nl\u1ef1c ma s\u00e1t ngh\u1ec9 \u0111\u00f3ng vai tr\u00f2 l\u00e0 l\u1ef1c h\u01b0\u1edbng t\u00e2m.<\/p>\n\n\n\n
b) N\u1ebfu b\u00e0n quay nhanh \u0111\u1ebfn m\u1ed9t t\u1ed1c \u0111\u1ed9 n\u00e0o \u0111\u00f3 th\u00ec \u0111\u1ed9 l\u1edbn c\u1ee7a l\u1ef1c ma s\u00e1t ngh\u1ec9 c\u1ef1c \u0111\u1ea1i nh\u1ecf h\u01a1n \u0111\u1ed9 l\u1edbn c\u1ee7a l\u1ef1c h\u01b0\u1edbng t\u00e2m c\u1ea7n thi\u1ebft n\u00ean v\u1eadt tr\u01b0\u1ee3t tr\u00ean b\u00e0n ra xa t\u00e2m quay, v\u0103ng ra ngo\u00e0i.<\/p>\n\n\n\n
B\u00e0i 4 (trang 82 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t v\u1eadt \nc\u00f3 kh\u1ed1i l\u01b0\u1ee3ng m = 20 g \u0111\u1eb7t \u1edf m\u00e9p m\u1ed9t chi\u1ebfc b\u00e0n quay. H\u1ecfi ph\u1ea3i quay b\u00e0n \nv\u1edbi t\u1ea7n s\u1ed1 v\u00f2ng l\u1edbn nh\u1ea5t b\u1eb1ng bao nhi\u00eau \u0111\u1ec3 v\u1eadt kh\u00f4ng v\u0103ng ra kh\u1ecfi b\u00e0n? \nCho bi\u1ebft m\u1eb7t b\u00e0n h\u00ecnh tr\u00f2n, b\u00e1n k\u00ednh 1 m. L\u1ef1c ma s\u00e1t ngh\u1ec9 c\u1ef1c \u0111\u1ea1i b\u1eb1ng \n0,08 N.<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n\u0110\u1ec3 v\u1eadt kh\u00f4ng b\u1ecb v\u0103ng ra ngo\u00e0i kh\u1ecfi b\u00e0n th\u00ec: Fht<\/sub> \u2264 Fmsn (max)<\/sub> \n<\/p>\n\n\n\n(Khi Fmsn (max)<\/sub> \u2264 Fht<\/sub> th\u00ec v\u1eadt b\u1ecb v\u0103ng)\n<\/p>\n\n\n\nL\u1ef1c h\u01b0\u1edbng t\u00e2m t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt:\n<\/p>\n\n\n\n