如图所示在皮带传动中,两轮半径不等,下列说法正确的是( )A.两轮角速度相等B.两轮上各点线速度的
\u5982\u56fe\u6240\u793a\u7684\u76ae\u5e26\u4f20\u52a8\u4e2d\uff0c\u4e24\u8f6e\u534a\u5f84\u4e0d\u7b49\uff0c\u4e0b\u5217\u8bf4\u6cd5\u6b63\u786e\u7684\u662f\uff08\u3000\u3000\uff09A\uff0e\u4e24\u8f6e\u89d2\u901f\u5ea6\u76f8\u7b49B\uff0e\u4e24\u8f6e\u8fb9\u7f18\u7ebf\u901f\u5ea6\u7684\u5927A\u3001\u9760\u76ae\u5e26\u4f20\u52a8\uff0c\u8f6e\u5b50\u8fb9\u7f18\u4e0a\u7684\u70b9\u7684\u7ebf\u901f\u5ea6\u5927\u5c0f\u76f8\u7b49\uff0c\u6839\u636ev=r\u03c9\uff0c\u77e5\u534a\u5f84\u5927\u7684\u89d2\u901f\u5ea6\u5c0f\uff0e\u6545A\u9519\u8bef\uff0cB\u6b63\u786e\uff0eC\u3001\u540c\u4e00\u8f6e\u5b50\u4e0a\u5404\u70b9\u7684\u89d2\u901f\u5ea6\u76f8\u7b49\uff0c\u6839\u636ea=r\u03c92\uff0c\u540c\u4e00\u8f6e\u4e0a\u5404\u70b9\u7684\u5411\u5fc3\u52a0\u901f\u5ea6\u8ddf\u8be5\u70b9\u4e0e\u4e2d\u5fc3\u7684\u8ddd\u79bb\u6210\u6b63\u6bd4\uff0e\u6545C\u6b63\u786e\uff0eD\u3001\u6839\u636ea=v2r\uff0c\u77e5\u7ebf\u901f\u5ea6\u76f8\u7b49\uff0c\u534a\u5f84\u5927\u7684\uff0c\u5411\u5fc3\u52a0\u901f\u5ea6\u5c0f\uff0e\u6240\u4ee5\u5927\u8f6e\u8fb9\u7f18\u4e00\u70b9\u7684\u5411\u5fc3\u52a0\u901f\u5ea6\u5c0f\u4e8e\u5c0f\u8f6e\u8fb9\u7f18\u4e00\u70b9\u7684\u5411\u5fc3\u52a0\u901f\u5ea6\uff0e\u6545D\u9519\u8bef\uff0e\u6545\u9009BD\uff0e
A\u3001\u9760\u76ae\u5e26\u4f20\u52a8\uff0c\u8f6e\u5b50\u8fb9\u7f18\u4e0a\u7684\u70b9\u7684\u7ebf\u901f\u5ea6\u5927\u5c0f\u76f8\u7b49\uff0c\u6839\u636ev=r\u03c9\uff0c\u77e5\u534a\u5f84\u5927\u7684\u89d2\u901f\u5ea6\u5c0f\uff0e\u6545A\u9519\u8bef\uff0cB\u6b63\u786e\uff0e C\u3001\u6839\u636e a= v 2 r \uff0c\u77e5\u7ebf\u901f\u5ea6\u76f8\u7b49\uff0c\u534a\u5f84\u5927\u7684\uff0c\u5411\u5fc3\u52a0\u901f\u5ea6\u5c0f\uff0e\u6240\u4ee5\u5927\u8f6e\u8fb9\u7f18\u4e00\u70b9\u7684\u5411\u5fc3\u52a0\u901f\u5ea6\u5c0f\u4e8e\u5c0f\u8f6e\u8fb9\u7f18\u4e00\u70b9\u7684\u5411\u5fc3\u52a0\u901f\u5ea6\uff0e\u6545C\u9519\u8bef\uff0e D\u3001\u540c\u4e00\u8f6e\u5b50\u4e0a\u5404\u70b9\u7684\u89d2\u901f\u5ea6\u76f8\u7b49\uff0c\u6839\u636ea\u2550r\u03c9 2 \uff0c\u540c\u4e00\u8f6e\u4e0a\u5404\u70b9\u7684\u5411\u5fc3\u52a0\u901f\u5ea6\u8ddf\u8be5\u70b9\u4e0e\u4e2d\u5fc3\u7684\u8ddd\u79bb\u6210\u6b63\u6bd4\uff0e\u6545D\u6b63\u786e\uff0e\u6545\u9009BD\uff0e
A、B、靠皮带传动,轮子边缘上的点的线速度大小相等,根据v=rω,知半径大的角速度小,但不是边缘点线速度不一定等.故A错误,B错误.C、根据a=
v2 |
r |
D、同一轮子上各点的角速度相等,根据a═rω2,同一轮上各点的向心加速度跟该点与中心的距离成正比.故D正确.
故选:D.
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绛旓細瀵逛簬A銆丅涓ょ偣锛鐨甫涓嶆墦婊戯紝A鍜孊涓ょ偣绾块熷害澶у皬鐩哥瓑锛庣敱鍏紡v=蠅r锛屽緱鍒帮細蠅 A 锛毾 B =r B 锛歳 A =1锛2锛嶢銆丆鍦ㄥ悓涓杞笂锛岃閫熷害鐩稿悓锛屾墍浠ハ A 锛毾 B 锛毾 C =1锛2锛1鐢卞叕寮廰 n =蠅 2 r锛屽緱鍒癮 A 锛歛 B 锛歛 C =2锛4锛1鏁呴塀 ...