两道高一物理题
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\u5f97 N/Mg\uff1d\uff08b+0.5*d\uff09/\u6839\u53f7[(L+0.5d)^2\uff0d(b+0.5*d\uff09^2]
N/200\uff1d(10+0.5*40)/\u6839\u53f7[(30+0.5*40)^2\uff0d(10+0.5*40\uff09^2] \uff0c\u5f97N\uff1d150\u725b\u987f
\u56e0\u4e3a \u03bc*N\uff1d0.2*150\uff1d30\u725b\u987f\uff1eA\u91cd\u529b20\u725b\u987f\uff0c\u6240\u4ee5A\u5904\u4e8e\u9759\u6b62\uff01
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\u5f97 F1\uff0b2*10\uff0d0.2*150\uff1d2*5 \uff0cF1\uff1d20\u725b\u987f\uff0c\u65b9\u5411\u7ad6\u76f4\u5411\u4e0b\uff1b
\u82e5\u65bd\u52a0\u4e00\u4e2a\u7ad6\u76f4\u5411\u4e0a\u7684\u529bF2\uff0c\u5219 F2\uff0dmg\uff0d\u03bc*N\uff1dma
\u5f97 F2\uff0d2*10\uff0d0.2*150\uff1d2*5 \uff0cF2\uff1d60\u725b\u987f\uff0c\u65b9\u5411\u7ad6\u76f4\u5411\u4e0a\u3002
2\u3001\u5bf9\u5706\u67f1\u4f53\u5206\u6790\u53d7\u529b\u6709\u91cd\u529bmg\u3001\u4e24\u4e2a\u62c9\u529bF\u3001\u652f\u6301\u529bFn\uff0c\u5408\u529b\u4e3a0\u3002
\u7528\u6b63\u4ea4\u5206\u89e3\u6cd5\uff0c\u5728\u5e73\u884c\u659c\u9762\u65b9\u5411\uff1amg*sin37\u5ea6\uff1dF+F*cos37\u5ea6
\u5728\u5782\u76f4\u659c\u9762\u65b9\u5411\uff1amg*cos37\u5ea6\uff1dFn+F*sin37\u5ea6
\u4e24\u4e2a\u65b9\u7a0b\u8054\u7acb\u5f97 3*10*0.6\uff1dF\uff0bF*0.8 \u4e14 3*10*0.8\uff1dFn+F*0.6
\u89e3\u5f97 \u62c9\u529bF\uff1d10\u725b\u987f\uff0c\u5f39\u529bFn\uff1d18\u725b\u987f
1)
\u7ebf\u901f\u5ea6v=4 ,\u5468\u671fT=2
\u90a3\u4e00\u5708\u5c31\u662f8
\u534a\u5f84\u5c31\u662fr=4/pi
\u901f\u5ea6\u53d8\u5316\u7387 a=v^2/r=4pi
2)
\u673a\u68b0\u80fd\u662f\u52a8\u80fd\u4e0e\u52bf\u80fd\u7684\u548c
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绛旓細X-7)m锛岃B鐞冭惤绗椂闂翠负t1锛孉鐞冭惤鍦版椂闂翠负t2锛孉鐞冭惤涓嬩竴绫崇殑鏃堕棿涓簍3锛屽垯锛歑=锛坓t2^2)/2 X-7=(gt1^2)/2 1=(gt3^2)/2 t2-t1=t3 鑱旇В浠ヤ笂4涓柟绋嬪緱X=16m 澶勭悊鐗╃悊闂閲嶅湪瀹￠锛岃鎵惧嚭棰樼洰涓墍闅愯棌鐨勬潯浠跺拰鍒嗘瀽棰樼洰鎵灞炵殑鐗╃悊妯″瀷锛屽湪鐢ㄦ妯″瀷鎵鏈夌殑瑙勫緥鏉ヨВ鍐崇墿鐞嗛棶棰樸
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绛旓細1)琛岃溅绐佸仠鏃堕摳浠跺洜鎯х户缁繍鍔紝璁鹃挗涓濈怀鎷夊姏涓篢锛屽垯鐢 T-mg=mvv/r姹傚緱 T=3*(10^3)*10+3*(10^3)*2*2/2=36000鐗 2)婊戝潡浠巆鐐归鍑哄悗鍋氬钩鎶涜繍鍔紝姘村钩浣嶇Щ涓 1.2m锛屼笅钀介珮搴︿负 h=2R=0.45m 鐢 h=(1/2)gtt 姹傚緱杩愬姩鏃堕棿 t=0.3绉掞紝鎵姹傞熷害V=1.2/0.3=4m/s 璇存槑:婊戝潡...
绛旓細1.F娴=蟻Vg=103脳2脳10锛3脳9.8=19.6锛堢墰锛夊悜涓嬬殑鎬婚噸鍔涳細 G鎬=(0.42+0.58)脳9.8=9.8锛堢墰锛夋按绠辩殑姘村悜涓嬬殑鍘嬪姏锛欶鍘=蟻ghS=103脳9.8脳0.6脳3.14脳0.032=16.6锛堢墰锛夆埖鍚戜笅鐨勫姏鐨勬诲拰F鍚戜笅=G鎬+F鍘=26.4鐗涳紴F娴 鈭村簳鐩朅灏嗕笅绉伙紝瑁呯疆鏃犳硶姝ｅ父宸ヤ綔銆2.瑙ｏ細缂嗚溅鐨...
绛旓細绛:1)360,0.2,360 2)8,0.4 瑙ｆ硶锛1)鐢变簬鎽╂摝鍙笌鏉愭枡鏈夊叧锛屾晠鍔犱簡璐ㄩ噺鍚庯紝u涓嶅彉锛宮=60kg M=120kg 鐢遍鍏堟湁mgu=f1=120N ,寰梪=0.2 f=G鎬籾=(m+M)ug=(60+120)*0.2*10N=360N 鍥犱负鍔犻熷墠杩涙椂锛屽姘村钩闈㈠帇鍔涗笉鍙橈紝鏁協涓嶅彉涓360N 2锛夋湪鍧楀寑閫熶笅婊戯紝鍚堝姏涓0锛屽洜姝涓嶨...
绛旓細1 浠ュ簳搴т负鍒嗘瀽瀵硅薄锛氶噸鍔沵g锛屽悜涓嬶紱鍦伴潰鏀寔鍔汵锛屽悜涓婏紱灏忕幆鎽╂摝鍔沠锛屽悜涓娿俶g=N+f N = mg-f = 1*10-2=8N 搴曞骇瀵瑰湴闈㈠帇鍔涳紝涓庡湴闈㈠搴曞骇鏀寔鍔涘ぇ灏忕浉绛夋柟鍚戠浉鍙嶏紝涓8N 2 AB鍏卞悓杩愬姩锛岀敤鏁翠綋娉曟眰鍑哄叡鍚屽姞閫熷害锛歛=F/(mA+mB)鍗曠嫭鍒嗘瀽B锛歂=mBa = FmB/(mA+mB)...
绛旓細涓銆1.閲嶅姏鍋氬姛绛変簬閲嶅姏鍔胯兘鍙樺寲閲忋傞噸鍔涙柟鍚戝悜涓嬩笌鐞冭繍鍔ㄦ柟鍚戠浉鍚岋紝鍋氭鍔燂紝W=GH=mgl 2.鎷夊姏濮嬬粓涓庨熷害鏂瑰悜鍨傜洿锛屼笉鍋氬姛銆3銆傛湭鍛婅瘔灏忕悆鍒拌揪o鐐归熷害锛屼笉鑳借绠楀鍔涘仛鍔熴浜銆1.鍥犱负鍖閫燂紝鎷夊姏涓庢部鏂滈潰鍚戜笅鐨勯噸鍔涘垎鍔涘ぇ灏忕浉绛夋柟鍚戠浉鍙嶏紝鎷夊姏鍋氬姛绛変簬娌垮姏鐨勬柟鍚戝彂鐢熶綅绉讳笌鍔涚殑涔樼Н锛學=FS=50*10*4=2000...
绛旓細1.鐗╀綋鍋氬钩鎶涜繍鍔ㄦ按骞抽熷害涓嶅彉锛岀敱鍥惧彲浠ョ湅鍑烘按骞抽熷害涓20cm/s=0.2m/s 2.鐢眡 = v0 t 锛宧 = 1/2gt^2,鍙緱 x = v0 鈭2h/g,鍙互鐪嬪嚭锛岀墿浣撳仛骞虫姏杩愬姩鐨勬按骞充綅绉诲彧涓庢按骞冲垵閫熷害鍜屾姏鍑虹偣楂樺害鏈夊叧锛屽洜涓轰袱灏忕悆閮芥槸浠嶰鐐规姏鍑猴紝鎵浠 x1 / x2 = v0 / 2v0 = 1/2,閫堿 ...
绛旓細v=54km/h=15m/s a1=-30cm/s=-0.3m/s(鍥犱负鏄噺閫熻繍鍔)a2=50cm/s=0.5m/s 鍒硅溅鑷冲仠姝㈢殑鏃堕棿t1=(0-v)/a1=50s 浣嶇Щs1=(0^2-v^2)/2a1=375m 鍚姩鑷虫仮澶嶅師鏈夐熷害鐨勬椂闂磘2=(v-0)/a2=30s 浣嶇Щs2=(v^2-0^2)/2a2=225m s1鍜宻2娈典綅绉诲鏋滄寜鐓у師鏈夐熷害琛岄┒,鎵闇瑕佺殑鏃堕棿涓 t3=(...
绛旓細鏍规嵁sf=mas=1/2mv*寰40绫抽珮澶勬椂鐨勯熷害涓20绫/绉.姝ゆ椂璇ョ墿浣撴嫢鏈夌殑鎬昏兘閲忎负1/2mv*+mgh=(200+400)m=600m 鏍规嵁鑳介噺瀹堟亽锛氬綋鍔胯兘mgh=600m/3鏃讹紙1/3鐨勫娍鑳+2/3鐨勫姩鑳=鎬昏兘閲忥級鍔ㄨ兘涓哄娍鑳界殑2鍊嶏紝閭ｄ箞h=20绫 锛堣鏄庯細v*灏辨槸v鐨勫钩鏂癸紝鍥犱负涓嶇煡閬撴庝箞琛ㄧず骞虫柟銆傦級鍥犱负姘村钩鍖閫燂紝鎵浠ユ按骞宠窛绂诲湪...
