C\u00e2u 14.<\/strong> Trong \u0111o\u1ea1n m\u1ea1ch xoay chi\u1ec1u g\u1ed3m \u0111i\u1ec7n tr\u1edf thu\u1ea7n, cu\u1ed9n c\u1ea3m thu\u1ea7n v\u00e0 t\u1ee5 \u0111i\u1ec7n m\u1eafc n\u1ed1i ti\u1ebfp. \u0110\u1eb7t v\u00e0o hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb hi\u1ec7u d\u1ee5ng U th\u00ec \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng \u00a0tr\u00ean \u0111i\u1ec7n tr\u1edf thu\u1ea7n, cu\u1ed9n c\u1ea3m thu\u1ea7n v\u00e0 t\u1ee5 \u0111i\u1ec7n l\u1ea7n l\u01b0\u1ee3t l\u00e0 U_{1<\/sub>, U2<\/sub>, U3<\/sub>. \u0110i\u1ec1u n\u00e0o sau \u0111\u00e2y kh\u00f4ng th\u1ec3 x\u1ea3y ra?<\/p>\n}

A.<\/strong>U_{1<\/sub>> U.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B.<\/strong>U1<\/sub>> U3<\/sub>. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0C.<\/strong>U2<\/sub>> U. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0D.<\/strong>U = U1 <\/sub>= U2<\/sub> = U3<\/sub>.<\/p>\n}

\u00a0C\u00e2u 15. <\/strong>Trong dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a, khi \u0111\u1ed9ng n\u0103ng c\u1ee7a v\u1eadt gi\u1ea3m th\u00ec<\/p>\n

A.<\/strong>v\u1eadt \u0111i t\u1eeb v\u1ecb tr\u00ed bi\u00ean \u0111\u1ebfn v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B.<\/strong>li \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a v\u1eadt c\u00f3 \u0111\u1ed9 l\u1edbn gi\u1ea3m.<\/p>\n

C.<\/strong>th\u1ebf n\u0103ng c\u1ee7a v\u1eadt gi\u1ea3m.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D.<\/strong>v\u1eadt \u0111i t\u1eeb v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng \u0111\u1ebfn v\u1ecb tr\u00ed bi\u00ean.<\/p>\n

\u00a0C\u00e2u 16. <\/strong>S\u00f3ng ngang truy\u1ec1n trong m\u1ed9t m\u00f4i tr\u01b0\u1eddng th\u00ec ph\u01b0\u01a1ng dao \u0111\u1ed9ng c\u1ee7a c\u00e1c ph\u1ea7n t\u1eed m\u00f4i tr\u01b0\u1eddng<\/p>\n

A.<\/strong>l\u00e0 ph\u01b0\u01a1ng ngang.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B.<\/strong>tr\u00f9ng v\u1edbi ph\u01b0\u01a1ng truy\u1ec1n s\u00f3ng.<\/p>\n

C.<\/strong>l\u00e0 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0D.<\/strong>vu\u00f4ng g\u00f3c v\u1edbi ph\u01b0\u01a1ng truy\u1ec1n s\u00f3ng.<\/p>\n

<\/p>\n

Theo Tuyensinh247<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e2u 14. Trong \u0111o\u1ea1n m\u1ea1ch xoay chi\u1ec1u g\u1ed3m \u0111i\u1ec7n tr\u1edf thu\u1ea7n, cu\u1ed9n c\u1ea3m thu\u1ea7n v\u00e0 t\u1ee5 \u0111i\u1ec7n m\u1eafc n\u1ed1i ti\u1ebfp. \u0110\u1eb7t v\u00e0o hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb hi\u1ec7u d\u1ee5ng U th\u00ec \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng \u00a0tr\u00ean \u0111i\u1ec7n tr\u1edf thu\u1ea7n, cu\u1ed9n c\u1ea3m thu\u1ea7n v\u00e0 t\u1ee5 \u0111i\u1ec7n l\u1ea7n l\u01b0\u1ee3t l\u00e0 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[25],"tags":[],"yoast_head":"\n