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{"id":44199,"date":"2019-10-13T14:35:57","date_gmt":"2019-10-13T07:35:57","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=44199"},"modified":"2019-10-13T14:35:57","modified_gmt":"2019-10-13T07:35:57","slug":"giai-vat-li-10-bai-37-cac-hien-tuong-be-mat-cua-chat-long","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/giai-vat-li-10-bai-37-cac-hien-tuong-be-mat-cua-chat-long\/","title":{"rendered":"Gi\u1ea3i V\u1eadt L\u00ed 10 B\u00e0i 37 : C\u00e1c hi\u1ec7n t\u01b0\u1ee3ng b\u1ec1 m\u1eb7t c\u1ee7a ch\u1ea5t l\u1ecfng"},"content":{"rendered":"\n

B\u00e0i 37 : C\u00e1c hi\u1ec7n t\u01b0\u1ee3ng b\u1ec1 m\u1eb7t c\u1ee7a ch\u1ea5t l\u1ecfng <\/h2>\n\n\n\n

C1.<\/strong> ( trang 198 sgk V\u1eadt L\u00fd 10): Cho bi\u1ebft \nh\u00ecnh tr\u00f2n c\u00f3 di\u1ec7n t\u00edch l\u1edbn nh\u1ea5t trong s\u1ed1 c\u00e1c h\u00ecnh c\u00f3 c\u00f9ng chu vi. H\u00e3y \nl\u1eadp lu\u1eadn \u0111\u1ec3 ch\u1ee9ng minh b\u1ec1 m\u1eb7t ph\u1ea7n m\u00e0ng x\u00e0 ph\u00f2ng c\u00f2n \u0111\u1ecdng tr\u00ean khung d\u00e2y\n \u0111\u1ed3ng \u0111\u00e3 t\u1ef1 co l\u1ea1i \u0111\u1ec3 gi\u1ea3m di\u1ec7n t\u00edch c\u1ee7a n\u00f3 t\u1edbi m\u1ee9c nh\u1ecf nh\u1ea5t.<\/ins><\/p>\n\n\n\n

Tr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\n

Gi\u1ea3 s\u1eed m\u00e0ng n\u01b0\u1edbc x\u00e0 ph\u00f2ng l\u1ea5p \u0111\u1ea7y to\u00e0n b\u1ed9 di\u1ec7n t\u00edch khung d\u00e2y \u0111\u1ed3ng, khi \u0111\u00f3 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t n\u01b0\u1edbc x\u00e0 ph\u00f2ng l\u00e0 l\u1edbn nh\u1ea5t.<\/p>\n\n\n\n

N\u1ebfu v\u00f2ng d\u00e2y ch\u1ec9 t\u0103ng di\u1ec7n t\u00edch l\u00ean th\u00ec ph\u1ea7n di\u1ec7n t\u00edch c\u00f2n l\u1ea1i c\u1ee7a m\u00e0ng n\u01b0\u1edbc x\u00e0 ph\u00f2ng gi\u1ea3m \u0111i.<\/p>\n\n\n\n

Khi v\u00f2ng d\u00e2y ch\u1ec9 c\u00f3 d\u1ea1ng h\u00ecnh tr\u00f2n-di\u1ec7n t\u00edch c\u1ee7a n\u00f3 l\u1edbn nh\u1ea5t-th\u00ec ph\u1ea7n di\u1ec7n t\u00edch c\u00f2n l\u1ea1i c\u1ee7a m\u00e0ng x\u00e0 ph\u00f2ng l\u00e0 nh\u1ecf nh\u1ea5t.<\/ins><\/p>\n\n\n\n

L\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t t\u00e1c d\u1ee5ng l\u00ean v\u00f2ng d\u00e2y ch\u1ec9 c\u00f3 chi\u1ec1u sao cho v\u00f2ng d\u00e2y \nch\u1ec9 h\u00ecnh tr\u00f2n, t\u01b0\u01a1ng \u1ee9ng m\u00e0 m\u00e0ng x\u00e0 ph\u00f2ng co l\u1ea1i \u0111\u1ec3 gi\u1ea3m di\u1ec7n t\u00edch t\u1edbi \nm\u1ee9c nh\u1ecf nh\u1ea5t.<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

C2.<\/strong> ( trang 199 sgk V\u1eadt L\u00fd 10): D\u1ef1a v\u00e0o c\u00f4ng th\u1ee9c \n h\u00e3y cho bi\u1ebft \u00fd ngh\u0129a c\u1ee7a h\u1ec7 s\u1ed1 c\u0103ng m\u1eb7t ngo\u00e0i \u03c3.<\/p>\n\n\n\n

Tr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\n

Ta c\u00f3 2\u03c0D l\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng bi\u00ean c\u1ee7a m\u00e0ng bao quanh v\u00f2ng d\u00e2y. N\u1ebfu ta ch\u1ecdn \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng bi\u00ean n\u00e0y l\u00e0 1m th\u00ec \u03c3 = Fc.<\/p>\n\n\n\n

\u2192 \u03c3 c\u00f3 \u00fd ngh\u0129a l\u00e0 l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t t\u00e1c d\u1ee5ng l\u00ean 1 \u0111\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng bi\u00ean bao quanh c\u1ee7a m\u00e0ng (N\/m)<\/p>\n\n\n\n

C3.<\/strong> ( trang 199 sgk V\u1eadt L\u00fd 10): T\u1eeb k\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m theo H\u00ecnh 37.3, h\u00e3y t\u00ednh :<\/p>\n\n\n\n

+ T\u1ed5ng c\u00e1c l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a n\u01b0\u1edbc t\u00e1c d\u1ee5ng l\u00ean chi\u1ebfc v\u00f2ng V: Fc = F \u2013 P <\/p>\n\n\n\n

+ T\u1ed5ng chu vi ngo\u00e0i v\u00e0 chu vi trong c\u1ee7a chi\u1ebfc v\u00f2ng V: L = \u03c0(D + d)<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

+ Gi\u00e1 tr\u1ecb h\u1ec7 s\u1ed1 c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a n\u01b0\u1edbc: \n<\/p>\n\n\n\n

Tr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\n

H\u1ecdc sinh l\u00e0m th\u1ef1c nghi\u1ec7m tr\u00ean l\u1edbp. Sau \u0111\u00f3 ghi c\u00e1c k\u1ebft qu\u1ea3 \u0111o \u0111\u1ea1c \u0111\u01b0\u1ee3c\n v\u00e0o b\u1ea3ng r\u1ed3i t\u00ednh c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng tr\u00ean theo c\u00f4ng th\u1ee9c \u0111\u00e3 \u0111\u01b0a ra.<\/p>\n\n\n\n

C4.<\/strong> ( trang 199 sgk V\u1eadt L\u00fd 10): L\u1ea5y hai \nb\u1ea3n th\u1ee7y tinh, trong \u0111\u00f3 m\u1ed9t b\u1ea3n \u0111\u1ec3 tr\u1ea7n, m\u1ed9t b\u1ea3n ph\u1ee7 l\u1edbp nilon. Nh\u1ecf l\u00ean \nm\u1eb7t c\u1ee7a m\u1ed7i b\u1ea3n n\u00e0y m\u1ed9t gi\u1ecdt n\u01b0\u1edbc. H\u00e3y quan s\u00e1t xem m\u1eb7t b\u1ea3n n\u00e0o b\u1ecb d\u00ednh \n\u01b0\u1edbt n\u01b0\u1edbc? M\u1eb7t b\u1ea3n n\u00e0o kh\u00f4ng b\u1ecb d\u00ednh \u01b0\u1edbt n\u01b0\u1edbc?<\/p>\n\n\n\n

Tr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\n

B\u1ea3n th\u1ee7y tinh kh\u00f4ng ph\u1ee7 l\u1edbp nilon b\u1ecb n\u01b0\u1edbc l\u00e0m d\u00ednh \u01b0\u1edbt.<\/p>\n\n\n\n

B\u1ea3n th\u1ee7y tinh c\u00f3 ph\u1ee7 l\u1edbp nilon kh\u00f4ng b\u1ecb n\u01b0\u1edbc l\u00e0m d\u00ednh \u01b0\u1edbt.<\/ins><\/p>\n\n\n\n

C6.<\/strong> ( trang 200 sgk V\u1eadt L\u00fd 10): \u0110\u1ed5 n\u01b0\u1edbc \nv\u00e0o m\u1ed9t c\u1ed1c th\u1ee7y tinh c\u00f3 th\u00e0nh ph\u1ea7n nh\u1eb5n. Quan s\u00e1t xem b\u1ec1 m\u1eb7t c\u1ee7a n\u01b0\u1edbc \u1edf\n s\u00e1t th\u00e0nh c\u1ed1c c\u00f3 d\u1ea1ng m\u1eb7t ph\u1eb3ng hay m\u1eb7t khum?<\/p>\n\n\n\n

Tr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\n

B\u1ec1 m\u1eb7t n\u01b0\u1edbc \u1edf s\u00e1t th\u00e0nh c\u1ed1c c\u00f3 d\u1ea1ng m\u1eb7t khum l\u00f5m.<\/p>\n\n\n\n

C7.<\/strong> ( trang 201 sgk V\u1eadt L\u00fd 10): H\u00e3y so s\u00e1nh m\u1ee9c n\u01b0\u1edbc trong c\u00e1c \u1ed1ng th\u1ee7y tinh v\u1edbi nhau v\u00e0 v\u1edbi b\u1ec1 m\u1eb7t c\u1ee7a n\u01b0\u1edbc \u1edf b\u00ean ngo\u00e0i c\u00e1c \u1ed1ng.<\/p>\n\n\n\n

Tr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\n

\u1ed0ng c\u00f3 \u0111\u01b0\u1eddng k\u00ednh trong c\u00e0ng nh\u1ecf th\u00ec m\u1ef1c n\u01b0\u1edbc trong \u1ed1ng c\u00e0ng d\u00e2ng cao h\u01a1n so v\u1edbi b\u1ec1 m\u1eb7t c\u1ee7a n\u01b0\u1edbc \u1edf b\u00ean ngo\u00e0i \u1ed1ng h3<\/sub> > h2<\/sub> > h1<\/sub>.<\/p>\n\n\n\n

B\u00e0i 4 (trang 202 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u00f4 t\u1ea3 \nhi\u1ec7n t\u01b0\u1ee3ng d\u00ednh \u01b0\u1edbt v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng kh\u00f4ng d\u00ednh \u01b0\u1edbt ch\u1ea5t l\u1ecfng. B\u1ec1 m\u1eb7t c\u1ee7a \nch\u1ea5t l\u1ecfng \u1edf s\u00e1t th\u00e0nh b\u00ecnh ch\u1ee9a n\u00f3 c\u00f3 h\u00ecnh d\u1ea1ng nh\u01b0 th\u1ebf n\u00e0o khi th\u00e0nh \nb\u00ecnh b\u1ecb d\u00ednh \u01b0\u1edbt?<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

Nh\u1ecf gi\u1ecdt n\u01b0\u1edbc l\u00ean t\u1ea5m th\u1ee7y tinh ta th\u1ea5y n\u01b0\u1edbc b\u1ecb lan r\u1ed9ng ra l\u00e0m \u01b0\u1edbt \nb\u1ec1 m\u1eb7t t\u1ea5m th\u1ee7y tinh. Ta n\u00f3i n\u01b0\u1edbc l\u00e0m d\u00ednh \u01b0\u1edbt th\u1ee7y tinh, nh\u1ecf gi\u1ecdt n\u01b0\u1edbc \nl\u00ean l\u00e1 khoai m\u00f4n, gi\u1ecdt n\u01b0\u1edbc co tr\u00f2n, d\u1eb9t xu\u1ed1ng do s\u1ee9c n\u1eb7ng . Ta n\u00f3i n\u01b0\u1edbc\n kh\u00f4ng l\u00e0m d\u00ednh \u01b0\u1edbt l\u00e1 khoai m\u00f4n.<\/p>\n\n\n\n

+ B\u1ec1 m\u1eb7t c\u1ee7a ch\u1ea5t l\u1ecfng \u1edf s\u00e1t th\u00e0nh b\u00ecnh ch\u1ee9a n\u00f3 c\u00f3 d\u1ea1ng m\u1eb7t khum l\u00f5m khi th\u00e0nh b\u00ecnh b\u1ecb d\u00ednh \u01b0\u1edbt.<\/p>\n\n\n\n

B\u00e0i 5 (trang 202 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u00f4 t\u1ea3 hi\u1ec7n t\u01b0\u1ee3ng mao d\u1eabn.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

Nh\u00fang ba \u1ed1ng th\u1ee7y tinh c\u00f3 \u0111\u01b0\u1eddng k\u00ednh trong nh\u1ecf kh\u00e1c nhau v\u00e0o ch\u1eadu n\u01b0\u1edbc. <\/p>\n\n\n\n

K\u1ebft qu\u1ea3 : m\u1ef1c n\u01b0\u1edbc trong \u1ed1ng d\u00e2ng cao h\u01a1n so v\u1edbi b\u1ec1 m\u1eb7t n\u01b0\u1edbc ngo\u00e0i \u1ed1ng . \u1ed0ng c\u00f3 \u0111\u01b0\u1eddng k\u00ednh c\u00e0ng nh\u1ecf. c\u1ed9t n\u01b0\u1edbc d\u00e2ng l\u00ean c\u00e0ng cao h\u01a1n. N\u1ebfu nh\u00fang v\u00e0o ch\u1eadu th\u1ee7y ng\u00e2n th\u00ec m\u1ef1c th\u1ee7y ng\u00e2n trong \u1ed1ng h\u1ea1 th\u1ea5p h\u01a1n so v\u1edbi b\u1ec1 m\u1eb7t th\u1ee7y ng\u00e2n ngo\u00e0i \u1ed1ng. \u1ed0ng c\u00e0ng nh\u1ecf, m\u1ef1c th\u1ee7y ng\u00e2n c\u00e0ng h\u1ea1 th\u1ea5p.<\/p>\n\n\n\n

B\u00e0i 6 (trang 202 SGK V\u1eadt L\u00fd 10) :<\/strong> C\u00e2u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 kh\u00f4ng \u0111\u00fang khi n\u00f3i v\u1ec1 l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a ch\u1ea5t l\u1ecfng ?<\/ins><\/p>\n\n\n\n

A. L\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t \u0111o\u1ea1n \u0111\u01b0\u1eddng nh\u1ecf b\u1ea5t k\u00ec tr\u00ean b\u1ec1 m\u1eb7t\n ch\u1ea5t l\u1ecfng c\u00f3 ph\u01b0\u01a1ng vu\u00f4ng g\u00f3c v\u1edbi \u0111o\u1ea1n \u0111\u01b0\u1eddng n\u00e0y v\u00e0 ti\u1ebfp tuy\u1ebfn v\u1edbi b\u1ec1 \nm\u1eb7t c\u1ee7a ch\u1ea5t l\u1ecfng.<\/p>\n\n\n\n

B. L\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t lu\u00f4n c\u00f3 ph\u01b0\u01a1ng vu\u00f4ng g\u00f3c v\u1edbi b\u1ec1 m\u1eb7t ch\u1ea5t l\u1ecfng.<\/p>\n\n\n\n

C. L\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t c\u00f3 chi\u1ec1u l\u00e0m gi\u1ea3m di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ch\u1ea5t l\u1ecfng.<\/p>\n\n\n\n

D. L\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t \u0111o\u1ea1n \u0111\u01b0\u1eddng nh\u1ecf b\u1ea5t k\u00ec tr\u00ean b\u1ec1 m\u1eb7t\n ch\u1ea5t l\u1ecfng c\u00f3 \u0111\u1ed9 l\u1edbn f t\u1ec9 l\u1ec7 v\u1edbi \u0111\u1ed9 d\u00e0i l c\u1ee7a \u0111o\u1ea1n \u0111\u01b0\u1eddng \u0111\u00f3.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

Ch\u1ecdn B.<\/p>\n\n\n\n

B\u00e0i 7 (trang 203 SGK V\u1eadt L\u00fd 10) :<\/strong> T\u1ea1i sao chi\u1ebfc kim kh\u00e2u c\u00f3 th\u1ec3 n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc khi \u0111\u1eb7t n\u1eb1m ngang?<\/p>\n\n\n\n

A. V\u00ec chi\u1ebfc kim kh\u00f4ng b\u1ecb d\u00ednh n\u01b0\u1edbc.<\/ins><\/p>\n\n\n\n

B. V\u00ec kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a chi\u1ebfc kim nh\u1ecf h\u01a1n kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc.<\/p>\n\n\n\n

C. V\u00ec tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a chi\u1ebfc kim \u0111\u00e8 l\u00ean m\u1eb7t n\u01b0\u1edbc khi n\u1eb1m ngang kh\u00f4ng th\u1eafng n\u1ed5i l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t.<\/p>\n\n\n\n

D. V\u00ec tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a chi\u1ebfc kim \u0111\u00e8 l\u00ean m\u1eb7t n\u01b0\u1edbc khi n\u1eb1m ngang kh\u00f4ng th\u1eafng n\u1ed5i l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a n\u01b0\u1edbc t\u00e1c d\u1ee5ng l\u00ean n\u00f3.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

Ch\u1ecdn D.<\/p>\n\n\n\n

Chi\u1ebfc kim kh\u00e2u \u0111\u1eb7t n\u1eb1m ngang tr\u00ean m\u1eb7t n\u01b0\u1edbc s\u1ebd t\u1ea1o ra m\u1ed9t \u0111o\u1ea1n \u0111\u01b0\u1eddng nh\u1ecf tr\u00ean b\u1ec1 m\u1eb7t n\u01b0\u1edbc \u2192 l\u1ef1c c\u0103ng m\u1eb7t ngo\u00e0i xu\u1ea5t hi\u1ec7n, c\u00f3 ph\u01b0\u01a1ng vu\u00f4ng g\u00f3c v\u1edbi \u0111\u01b0\u1eddng d\u1ecdc bi\u00ean c\u00e2y kim, chi\u1ec1u h\u01b0\u1edbng l\u00ean. \u0110\u1ed3ng th\u1eddi tr\u1ecdng l\u1ef1c c\u00e2y kim nh\u1ecf, n\u00ean kh\u00f4ng th\u1eafng \u0111\u01b0\u1ee3c l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a n\u01b0\u1edbc \u2192 kim n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc.<\/p>\n\n\n\n

B\u00e0i 8 (trang 203 SGK V\u1eadt L\u00fd 10) :<\/strong> C\u00e2u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 kh\u00f4ng \u0111\u00fang khi n\u00f3i v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng d\u00ednh \u01b0\u1edbt v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng kh\u00f4ng d\u00ednh \u01b0\u1edbt c\u1ee7a ch\u1ea5t l\u1ecfng?<\/p>\n\n\n\n

A. V\u00ec th\u1ee7y tinh b\u1ecb n\u01b0\u1edbc d\u00ednh \u01b0\u1edbt, n\u00ean gi\u1ecdt n\u01b0\u1edbc nh\u1ecf tr\u00ean m\u1eb7t b\u1ea3n th\u1ee7y tinh lan r\u1ed9ng th\u00e0nh m\u1ed9t h\u00ecnh c\u00f3 d\u1ea1ng b\u1ea5t k\u00ec.<\/ins><\/p>\n\n\n\n

B. V\u00ec th\u1ee7y tinh b\u1ecb n\u01b0\u1edbc d\u00ednh \u01b0\u1edbt, n\u00ean b\u1ec1 m\u1eb7t c\u1ee7a n\u01b0\u1edbc \u1edf s\u00e1t th\u00e0nh b\u00ecnh th\u1ee7y tinh c\u00f3 d\u1ea1ng m\u1eb7t khum l\u00f5m.<\/p>\n\n\n\n

C. V\u00ec th\u1ee7y tinh kh\u00f4ng b\u1ecb th\u1ee7y ng\u00e2n d\u00ednh \u01b0\u1edbt, n\u00ean gi\u1ecdt th\u1ee7y ng\u00e2n nh\u1ecf \ntr\u00ean m\u1eb7t b\u1ea3n th\u1ee7y tinh vo tr\u00f2n l\u1ea1i v\u00e0 b\u1ecb d\u1eb9t xu\u1ed1ng do t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng\n l\u1ef1c.<\/p>\n\n\n\n

D. V\u00ec th\u1ee7y tinh kh\u00f4ng b\u1ecb th\u1ee7y ng\u00e2n d\u00ednh \u01b0\u1edbt, n\u00ean b\u1ec1 m\u1eb7t c\u1ee7a th\u1ee7y ng\u00e2n \u1edf s\u00e1t th\u00e0nh b\u00ecnh th\u1ee7y tinh c\u00f3 d\u1ea1ng m\u1eb7t khum l\u00f5m.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

Ch\u1ecdn D.<\/p>\n\n\n\n

+ Khi ch\u1ea5t l\u1ecfng ti\u1ebfp x\u00fac v\u1edbi ch\u1ea5t r\u1eafn th\u00ec t\u00f9y theo b\u1ea3n ch\u1ea5t c\u1ee7a ch\u1ea5t \nl\u1ecfng v\u00e0 ch\u1ea5t r\u1eafn m\u00e0 c\u00f3 th\u1ec3 x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng d\u00ednh \u01b0\u1edbt ho\u1eb7c kh\u00f4ng d\u00ednh \n\u01b0\u1edbt.\n<\/p>\n\n\n\n

     – Khi l\u1ef1c h\u00fat gi\u1eefa c\u00e1c ph\u00e2n t\u1eed v\u1eadt r\u1eafn v\u00e0 c\u00e1c ph\u00e2n t\u1eed ch\u1ea5t \nl\u1ecfng m\u1ea1nh h\u01a1n l\u1ef1c h\u00fat gi\u1eefa c\u00e1c ph\u00e2n t\u1eed ch\u1ea5t l\u1ecfng v\u1edbi nhau, th\u00ec c\u00f3 hi\u1ec7n \nt\u01b0\u1ee3ng d\u00ednh \u01b0\u1edbt.\n<\/p>\n\n\n\n

     – Khi l\u1ef1c h\u00fat gi\u1eefa c\u00e1c ph\u00e2n t\u1eed v\u1eadt r\u1eafn v\u00e0 c\u00e1c ph\u00e2n t\u1eed ch\u1ea5t \nl\u1ecfng y\u1ebfu h\u01a1n l\u1ef1c h\u00fat gi\u1eefa c\u00e1c ph\u00e2n t\u1eed ch\u1ea5t l\u1ecfng v\u1edbi nhau, th\u00ec c\u00f3 hi\u1ec7n \nt\u01b0\u1ee3ng kh\u00f4ng d\u00ednh \u01b0\u1edbt.\n<\/p>\n\n\n\n

+ S\u00e1t m\u00e9p ch\u1ea5t l\u1ecfng v\u1edbi th\u00e0nh b\u00ecnh, m\u1eb7t tho\u00e1ng ch\u1ea5t l\u1ecfng h\u01a1i b\u1ecb cong g\u1ecdi l\u00e0 m\u1eb7t khum. \n<\/p>\n\n\n\n

+ N\u1ebfu ch\u1ea5t l\u1ecfng l\u00e0m d\u00ednh \u01b0\u1edbt th\u00e0nh b\u00ecnh th\u00ec m\u1eb7t khum \u0111\u00f3 l\u00e0 m\u1eb7t l\u00f5m, c\u00f2n n\u1ebfu ch\u1ea5t l\u1ecfng kh\u00f4ng l\u00e0m d\u00ednh \u01b0\u1edbt th\u00e0nh b\u00ecnh th\u00ec m\u1eb7t khum l\u00e0 l\u1ed3i. <\/p>\n\n\n\n

B\u00e0i 9 (trang 203 SGK V\u1eadt L\u00fd 10) :<\/strong> T\u1ea1i sao n\u01b0\u1edbc m\u01b0a kh\u00f4ng l\u1ecdt qua \u0111\u01b0\u1ee3c c\u00e1c l\u1ed7 nh\u1ecf tr\u00ean t\u1ea5m v\u1ea3i b\u1ea1t?<\/p>\n\n\n\n

A. V\u00ec t\u1ea5m v\u1ea3i b\u1ea1t b\u1ecb d\u00ednh \u01b0\u1edbt n\u01b0\u1edbc<\/ins><\/p>\n\n\n\n

B. V\u00ec v\u1ea3i b\u1ea1t kh\u00f4ng b\u1ecb d\u00ednh \u01b0\u1edbt n\u01b0\u1edbc<\/p>\n\n\n\n

C. V\u00ec l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a n\u01b0\u1edbc ng\u0103n c\u1ea3n kh\u00f4ng cho n\u01b0\u1edbc l\u1ecdt qua c\u00e1c l\u1ed7 nh\u1ecf c\u1ee7a t\u1ea5m b\u1ea1t.<\/p>\n\n\n\n

D. V\u00ec hi\u1ec7n t\u01b0\u1ee3ng mao d\u1eabn ng\u0103n c\u1ea3n kh\u00f4ng cho n\u01b0\u1edbc l\u1ecdt qua c\u00e1c l\u1ed7 tr\u00ean t\u1ea5m b\u1ea1t.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

Ch\u1ecdn C.<\/p>\n\n\n\n

B\u00e0i 10 (trang 203 SGK V\u1eadt L\u00fd 10) :<\/strong> T\u1ea1i sao gi\u1ecdt d\u1ea7u l\u1ea1i c\u00f3 d\u1ea1ng kh\u1ed1i c\u1ea7u n\u1eb1m l\u01a1 l\u1eedng trong dung d\u1ecbch r\u01b0\u1ee3u c\u00f3 c\u00f9ng kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u1edbi n\u00f3?<\/p>\n\n\n\n

A. V\u00ec h\u1ee3p l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean gi\u1ecdt d\u1ea7u b\u1eb1ng kh\u00f4ng, n\u00ean do hi\u1ec7n t\u01b0\u1ee3ng \nc\u0103ng b\u1ec1 m\u1eb7t , l\u00e0m cho di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t c\u1ee7a gi\u1ecdt d\u1ea7u co l\u1ea1i \u0111\u1ebfn gi\u00e1 tr\u1ecb \nnh\u1ecf nh\u1ea5t \u1ee9ng v\u1edbi di\u1ec7n t\u00edch m\u1eb7t c\u1ea7u v\u00e0 n\u1eb1m l\u01a1 l\u1eedng trong dung d\u1ecbch r\u01b0\u1ee3u.<\/ins><\/p>\n\n\n\n

B. V\u00ec gi\u1ecdt d\u1ea7u kh\u00f4ng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c n\u00e0o c\u1ea3, n\u00ean do hi\u1ec7n t\u01b0\u1ee3ng \nc\u0103ng b\u1ec1 m\u1eb7t, di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t gi\u1ecdt d\u1ea7u co l\u1ea1i \u0111\u1ebfn gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t \u1ee9ng \nv\u1edbi di\u1ec7n t\u00edch c\u1ee7a m\u1eb7t h\u00ecnh c\u1ea7u v\u00e0 n\u1eb1m l\u01a1 l\u1eedng trong dung d\u1ecbch r\u01b0\u1ee3u.<\/p>\n\n\n\n

C. V\u00ec gi\u1ecdt d\u1ea7u kh\u00f4ng b\u1ecb dung d\u1ecbch r\u01b0\u1ee3u d\u00ednh \u01b0\u1edbt, n\u00ean n\u00f3 n\u1eb1m l\u01a1 l\u1eedng trong dung d\u1ecbch.<\/p>\n\n\n\n

D. V\u00ec l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a d\u1ea7u l\u1edbn h\u01a1n l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a dung d\u1ecbch r\u01b0\u1ee3u, n\u00ean \u00f3n n\u1eb1m l\u01a1 l\u1eedng trong dung d\u1ecbch r\u01b0\u1ee3u.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

Ch\u1ecdn A. Hai kh\u1ed1i c\u00f9ng th\u1ec3 t\u00edch, kh\u1ed1i d\u1ea1ng h\u00ecnh c\u1ea7u c\u00f3 di\u1ec7n t\u00edch m\u1eb7t ngo\u00e0i l\u00e0 nh\u1ecf nh\u1ea5t. V\u00ec v\u1eady khi h\u1ee3p l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean ch\u1ea5t l\u1ecfng b\u1eb1ng kh\u00f4ng th\u00ec l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t l\u00e0m cho kh\u1ed1i ch\u1ea5t c\u00f3 d\u1ea1ng h\u00ecnh c\u1ea7u \u0111\u1ec3 gi\u1ea3m t\u1ed1i \u0111a di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t tho\u00e1ng.<\/p>\n\n\n\n

B\u00e0i 11 (trang 203 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t \nv\u00f2ng xuy\u1ebfn c\u00f3 \u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i l\u00e0 44 mm v\u00e0 \u0111\u01b0\u1eddng k\u00ednh trong l\u00e0 40 mm. \nTr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u00f2ng xuy\u1ebfn l\u00e0 45 mN. L\u1ef1c b\u1ee9t v\u00f2ng xuy\u1ebfn n\u00e0y ra kh\u1ecfi b\u1ec1 \nm\u1eb7t c\u1ee7a glixerin \u1edf 20o<\/sup>C l\u00e0 64,3 mN. T\u00ednh h\u1ec7 s\u1ed1 c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a glixerin \u1edf nhi\u1ec7t \u0111\u1ed9 n\u00e0y.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

Khi nh\u1ea5c v\u00f2ng xuy\u1ebfn l\u00ean, l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t tho\u00e1ng glixerin h\u01b0\u1edbng xu\u1ed1ng c\u00f9ng h\u01b0\u1edbng tr\u1ecdng l\u1ef1c \n c\u1ee7a v\u00f2ng xuy\u1ebfn, do \u0111\u00f3 ta c\u00f3:<\/p>\n\n\n\n

       Fb\u1ee9t<\/sub> = Fc<\/sub> + P<\/p>\n\n\n\n

       Fc<\/sub> = Fb\u1ee9t<\/sub> – P = 64,3.10-3<\/sup> – 45.10-3<\/sup> = 19,3.10-3<\/sup> (N)<\/p>\n\n\n\n

\u0110\u01b0\u1eddng gi\u1edbi h\u1ea1n m\u1eb7t tho\u00e1ng b\u1eb1ng t\u1ed5ng chu vi ngo\u00e0i v\u00e0 chu vi trong c\u1ee7a v\u00f2ng xuy\u1ebfn <\/p>\n\n\n\n

       l = d1<\/sub>\u03c0 + d2<\/sub>\u03c0 = \u03c0(d1<\/sub> + d2<\/sub>) = 3,14(0,044 + 0,04) = 0,264 m<\/p>\n\n\n\n

\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t: <\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

B\u00e0i 12 (trang 203 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t \nm\u00e0ng x\u00e0 ph\u00f2ng \u0111\u01b0\u1ee3c c\u0103ng tr\u00ean m\u1eb7t khung d\u00e2y \u0111\u1ed3ng m\u1ea3nh h\u00ecnh ch\u1eef nh\u1eadt treo \nth\u1eb3ng \u0111\u1ee9ng , \u0111o\u1ea1n d\u00e2y \u0111\u1ed3ng ab d\u00e0i 50 mm v\u00e0 c\u00f3 th\u1ec3 tr\u01b0\u1ee3t d\u1ec5 d\u00e0ng d\u1ecdc theo\n chi\u1ec1u d\u00e0i c\u1ee7a khung (H\u00ecnh 37.8) .T\u00ednh tr\u1ecdng l\u01b0\u1ee3ng P c\u1ee7a \u0111o\u1ea1n d\u00e2y ab \u0111\u1ec3 \nn\u00f3 n\u1eb1m c\u00e2n b\u1eb1ng. M\u00e0ng x\u00e0 ph\u00f2ng c\u00f3 h\u1ec7 s\u1ed1 c\u0103ng b\u1ec1 m\u1eb7t \u03c3 = 0,040 N\/m.<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

Tr\u1ecdng l\u1ef1c P\u2192 k\u00e9o thanh ab tr\u01b0\u1ee3t xu\u1ed1ng, l\u00e0m t\u0103ng di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t tho\u00e1ng, do \u0111\u00f3 l\u1ef1c c\u0103ng b\u1ec1 m\u1eb7t \n t\u00e1c d\u1ee5ng v\u00e0o \u0111o\u1ea1n ab s\u1ebd h\u01b0\u1edbng l\u00ean. \u0110\u1ebfn khi ab n\u1eb1m c\u00e2n b\u1eb1ng, ta c\u00f3 <\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

V\u1ec1 \u0111\u1ed9 l\u1edbn: P = Fc = \u03c3.2l = 0,04.2.0,05 = 4.10-3<\/sup> (N)<\/p>\n\n\n\n

(L\u01b0u \u00fd: c\u00f3 2 b\u1ec1 m\u1eb7t tho\u00e1ng c\u1ee7a m\u00e0ng n\u01b0\u1edbc x\u00e0 ph\u00f2ng).<\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i 37 : C\u00e1c hi\u1ec7n t\u01b0\u1ee3ng b\u1ec1 m\u1eb7t c\u1ee7a ch\u1ea5t l\u1ecfng C1. ( trang 198 sgk V\u1eadt L\u00fd 10): Cho bi\u1ebft h\u00ecnh tr\u00f2n c\u00f3 di\u1ec7n t\u00edch l\u1edbn nh\u1ea5t trong s\u1ed1 c\u00e1c h\u00ecnh c\u00f3 c\u00f9ng chu vi. 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