如图，一辆货车车厢底板离地面的高度为32米，为了方便下货，常用一块木板搭成一个斜面，要使斜面与水平地 如图所示为探究“阻力对物体运动的影响”的实验．使同一辆小车从...
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解：如图：AC为车厢底板离地面的高度| 3 |
| 2 |
AB是要求木板的长度，
因为在直角三角形ABC中，∠B=30°，
所以AB=2AC=2×
| 3 |
| 2 |
故选：A．
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绛旓細鍗婃寕杞︾殑闀垮害鍒欐湁17.5绫冲拰12.5绫崇殑瑙勬牸锛岀敋鑷虫湁鏈闀胯揪鍒20绫崇殑鍨嬪彿銆傝溅鍘㈠搴︼紝鍗充究鏄渶绐勭殑锛屼篃涓嶅皯浜2.5绫炽傚叧浜璐ц溅杞﹀帰瀹藉害鐨勫叿浣撻檺鍒讹細2.5鍚ㄨ揣杞︼紙鍘㈠紡/鏉胯溅锛夛細灏哄涓4.2绫 x 1.9绫 x 1.8绫筹紙鍦伴潰鍒拌溅鏉1.1绫筹級锛屾渶澶у疄闄呰浇閲嶉噺涓3鍚/12绔嬫柟绫炽3.5鍚ㄨ揣杞︼紙鍘㈠紡/鏉胯溅锛夛細灏哄...
绛旓細鍙傛暟浠嬬粛锛1銆佸噣杞﹀帰闀垮害 9.6绫璐ц溅锛閫氬父鍑杞﹀帰闀9.6绫筹紙璐у帰鏍忔澘鍐呭昂瀵搁暱锛9.6绫筹級锛屼笉甯﹁溅澶达紝鍙互瑁呰揣鐨勭殑鏈闀块檺搴︽槸9.6绫充互鍐咃紱2銆佸噣杞﹀帰瀹藉害 鍑瀹藉害2.3绫筹紙璐у帰鏍忔澘鍐呭昂瀵稿锛2.4绫筹級锛岀簿缁嗙偣鍙互2.35绫筹紝鍙璐х墿瑙勬牸瀹藉害鍦2.4绫充互鍐咃紱3銆佽溅搴曟澘楂樺害 浠鍦伴潰鍒杞﹀帰搴曟澘1.5绫冲乏鍙...
