高一物理，初三的暑假作业，所以很多不懂。。望说明过程。可能追问
\u9ad8\u4e00\u7269\u7406\u95ee\u9898 \u6211\u5373\u5c06\u9ad8\u4e00\u505a\u6691\u5047\u4f5c\u4e1a\u5462 \u8bb8\u591a\u96be\u70b9\u4e0d\u61c21.\u4e09\u89d2\u51fd\u6570\u5b66\u4e86\u5427\uff0c\u52fe\u80a1\u5b9a\u7406\u8fd8\u8bb0\u5f97\u5427\uff0c\u91cc\u9762\u76843\u30014\u30015\u5462\uff0c37\u00b0\u5c31\u662f\u8fd9\u4e2a\u76f4\u89d2\u4e09\u89d2\u5f62\u5f53\u4e2d\u7684\u4e00\u4e2a\u9510\u89d2\uff0c\u4e0d\u7528\u53bb\u80cc\u6b63\u5f26\u3001\u4f59\u5f26\uff0c\u53ea\u8981\u8bb0\u5f97\u52fe\u80a1\u5b9a\u7406\u91cc\u9762\u76843\u30014\u30015\u5c31\u591f\u4e86\u3002
2.\u4e0d\u4e00\u5b9a\u5c31\u662f\u4f59\u5f26\uff0c\u770b\u4f6037\u00b0\u89d2\u662f\u54ea\u4e2a\u4e86\uff0c\u53ef\u80fd\u662f\u6b63\u5f26\uff0c
3.\u8fd9\u4e2a\u662f\u529b\u7684\u5206\u89e3\u7684\u9898\u76ee\uff0c\u662f\u628a\u91cd\u529b\u6cbf\u7740\u659c\u9762\u65b9\u5411\u8fdb\u884c\u7684\u5206\u89e3\uff0c\u81f3\u4e8esin, cos\u5c31\u8981\u5bf9\u5177\u4f53\u95ee\u9898\u8fdb\u884c\u5206\u6790\u4e86\u3002
\u5b8c\u5168\u662f\u8bef\u4eba\u5b50\u5f1f
\u8fd9\u4e2a\u9898\u6839\u636e\u7684\u662f\u52a8\u91cf\u5b88\u6052\u548c\u673a\u68b0\u80fd\u5b88\u6052
\u901f\u5ea6\u6700\u5feb\u7684\u65f6\u5019\uff0c\u662f\u5f39\u7c27\u52bf\u80fd\u4e3a0\u7684\u65f6\u5019
\u5f53\u5f39\u7c27\u6709\u6700\u77ed\u5230\u6b63\u5e38\uff0c\u524d\u9762\u7684\u901f\u5ea6\u6700\u5feb\uff0c\u540e\u9762\u7684\u6700\u6162
\u5f53\u5f39\u7c27\u7531\u6700\u957f\u5230\u6b63\u5e38\uff0c\u540e\u9762\u7684\u6700\u5feb\uff0c\u524d\u9762\u7684\u6700\u6162
\u5509\uff0c\u8fd8\u662f\u6211\u6765\u89e3\u5427\uff1a
1 \u5f39\u7c27\u7531\u6700\u77ed\u5230\u6b63\u5e38\u8fc7\u7a0b\u4e2d\uff0c\u5bf9\u524d\u9762\u7684\u6709\u63a8\u529b\uff0c\u5bf9\u540e\u9762\u7684\u6709\u963b\u529b\uff0c\u6240\u4ee5\uff0c\u6700\u7ec8\uff1a\u524d\u9762\u7684\u901f\u5ea6\u6700\u5927\uff0c\u540e\u9762\u7684\u901f\u5ea6\u6700\u5c0f
\u52a8\u91cf\u5b88\u6052\uff1a\uff080.2+0.4\uff09*2 = 0.2*v1 + 0.4*v2
\u673a\u68b0\u80fd\u5b88\u6052\uff1a(1/2)*(0.2+0.4)*2^2 + 0.6 = (1/2)*0.2*v1^2 + (1/2)*0.4*v2^2
2 \u5f39\u7c27\u7531\u6b63\u5e38\u5230\u6700\u957f\u8fc7\u7a0b\u4e2d\uff0c\u5bf9\u524d\u9762\u7684\u6709\u963b\u529b\uff0c\u5bf9\u540e\u9762\u7684\u6709\u7275\u5f15\uff0c\u6240\u4ee5\u524d\u9762\u7684\u901f\u5ea6\u51cf\u5c0f\uff0c\u540e\u9762\u7684\u901f\u5ea6\u589e\u5927\uff0c\u6700\u540e\u901f\u5ea6\u4e00\u6837\uff0c\u5f39\u7c27\u67090.6J\u7684\u52bf\u80fd
3 \u5f39\u7c27\u7531\u6700\u957f\u5230\u6b63\u5e38\u8fc7\u7a0b\u4e2d\uff0c\u5bf9\u524d\u9762\u7684\u6709\u963b\u529b\uff0c\u5bf9\u540e\u9762\u7684\u6709\u7275\u5f15\uff0c\u6240\u4ee5\uff0c\u6700\u7ec8\u524d\u9762\u7684\u901f\u5ea6\u6700\u5c0f\uff0c\u540e\u9762\u7684\u901f\u5ea6\u6700\u5927
\u516c\u5f0f\u548c\u524d\u9762\u4e00\u6837\uff0c
4 \u5f39\u7c27\u7531\u6b63\u5e38\u5230\u6700\u957f\u8fc7\u7a0b\u4e2d\uff0c\u5bf9\u524d\u9762\u7684\u6709\u63a8\u529b\uff0c\u5bf9\u540e\u9762\u7684\u6709\u963b\u529b\uff0c\u6240\u4ee5\u524d\u9762\u7684\u901f\u5ea6\u589e\u5927\uff0c\u540e\u9762\u7684\u901f\u5ea6\u51cf\u5c0f\uff0c\u6700\u540e\u901f\u5ea6\u4e00\u6837\uff0c\u5f39\u7c27\u67090.6J\u7684\u52bf\u80fd
\u6839\u636e\u7b97\u5f0f\u5f97\uff1a
v1 = 0m/s ,v2 = 3m/s
\u6216\u8005
v1 = 4m/s ,v2 = 1m/s
\u7ed3\u8bba\uff0c\u6211\u4eec\u5047\u8bbeA\uff1a0.2kg\u7684\u5728\u540e\u9762
\u5f53\u7ef3\u5b50\u65ad\u4e86\u65f6\u5019\uff0c\u5f39\u7c27\u7531\u6700\u77ed\u5230\u6b63\u5e38\u65f6\u5019\uff0cA\u901f\u5ea6\u6700\u5c0f\uff0c\u4e3a0m/s,B\u901f\u5ea6\u6700\u5927\uff0c\u4e3a3m/s\uff0c
\u7b49\u5f39\u7c27\u53d8\u5230\u6700\u957f\uff0c\u518d\u56de\u5230\u6b63\u5e38\u7684\u65f6\u5019\uff0cA\u901f\u5ea6\u6700\u5927\uff0c\u4e3a4m/s\uff0cB\u901f\u5ea6\u6700\u5c0f\uff0c\u4e3a1m/s\uff0c
\u5982\u679cB\u5728\u540e\u9762\uff0c\u548c\u4e0a\u9762\u7ed3\u679c\u76f8\u53cd\uff01
fACsin60°+fBCsin30°=100
fBC=50N
fAC=50√3 N
绛旓細fAC=50鈭3 N
绛旓細鍦ㄦ渶楂樼偣锛氬洜涓洪熷害姘村钩锛屾墍浠绔栫洿鏂瑰悜涓婇潰娌℃湁閫熷害 鎵浠ュ姩鑳=mv^2/2 涓嬮潰鏉ヨ绠楃伀鏄熺殑g mg=GMm/r0^2 g=GM/r0^2 GMm/r^2=4*r*m*蟺^2/T^2 (杩欎釜瑕佽В閲婏細杩欎釜鏄粍閲戜唬鎹 鎭╂仼)鎵浠M=4蟺^2*r^3/T^2 g=4蟺^2*r^3/(T^2*r0^2)鐒跺悗鍥犱负涓嶈闃诲姏锛屾墍浠ユ満姊拌兘瀹堟亽 鎵浠=Ek+...
绛旓細鐗╀綋绂诲紑椋炴満鍚庯紝鍦ㄥ紑濮10绉掑唴鍋氬钩鎶涜繍鍔紝涓斿垵閫熷害涓100m/s锛10绉掑悗鍋氬寑閫熻繍鍔ㄣ傚洜涓虹墿浣撶寮椋炴満鍚庡紑濮10绉掑唴涓嬮檷鐨勯珮搴︿负h1=gt1^2/2=10*10^2/2=500m 10绉掓湯鐨勯熷害澶у皬涓簐t=gt1=10*10m/s=100m/s 鎵浠10绉掑悗鐗╀綋鍋氬寑閫熻繍鍔ㄦ椂鐨勭珫鐩村垎閫熷害澶у皬涓100m/s.鏁呭寑閫熶笅钀芥椂闂翠负t2=(1500-500)...
绛旓細t1:t2:t3=锛堚垰3-鈭2锛:锛堚垰2-1锛夛細1 绗簩棰樺悓鏍峰彲鐢╲t鍥撅紝鍦ㄦ灏变笉璇翠簡銆傝繍鍔ㄩ棶棰樼敤鍥捐В娉曟湁鏃舵槸闈炲父鐩磋鐨勶紝甯屾湜瀵逛綘鏈夊府鍔╋紒
绛旓細(1)褰揊鐗=f闃绘椂灏嗚揪鏈澶ч熷害 F鐗=2000N P=F鐗礦鏈 V鏈=P/F鐗=80000/2000=40m\s (2)鍥犱负F鐗垫槸鍙樺寲鐨锛屾墍浠涓嶆槸鍋氬寑鍔犻熷害杩愬姩锛屾崲涓柟娉 鎽╂摝鍔涘仛鐨勫姛+鏈姩鑳-鍒濆鍔ㄨ兘=鍋氱殑姝ｅ姛 60s鍋氬姛=80000x60=4800000J 鈭磃L+1/2mvt^2-1/2mv0^2=4800000 2000L+1/2x2000x40^2-1/2x2000...
绛旓細鎵浠涓ょ墿浣撲箣闂寸殑鐩稿鍔犻熷害涓0m/s^2,鐩稿閫熷害涓:v=gt1=9.8m/s^2*1s=9.8m/s,鐗╀綋1鍋氳嚜鐢辫惤浣1s鎵璧颁綅绉籹1=0.5*9.8m/s^2*(1s)^2=4.9m 缁冲瓙闀縧=93.1m-4.9m=88.2m 鎵浠ユ椂闂翠负:88.2m/(9.8m/s)=9s 鍋氳繖绫绘湁涓や釜鐗╀綋杩愬姩鐨勯棶棰,鍙互鐢ㄧ浉瀵瑰姞閫熷害鍜岀浉瀵归熷害鏉ヨВ绛....
绛旓細瑙ｏ細璁炬潌鍚戜笅杩愬姩鐨勫姞閫熷害涓篴锛屾潌鐨勮川閲忎负m锛岀尨瀛愯川閲忎负M锛岀尨瀛愬拰鏉嗛棿鐨勭浉浜掍綔鐢ㄥ姏澶у皬涓篎锛屽鏉嗭紝鐢辩墰椤跨浜屽畾寰嬪緱mg+F=ma 瀵圭尨瀛愶紝鐢卞钩琛℃潯浠跺緱F=Mg 鑱旂珛寰梐=锛圡+m锛塯/m=锛18+12锛塜9锛8/12锛24.5m/s²
绛旓細涓銆佹兂涓鎯崇郴缁熷簲褰撳彈鎬庢牱鐨勫姏浣滅敤鎵嶈兘鏈夌幇鍦ㄨ繖绉嶇姸鎬侊紝鍗冲亣璁句竴浜涙儏鍐电劧鍚庢牴鎹鐩潯浠跺垪鍑烘柟绋嬭繘琛屾眰瑙ｏ紱浜屻佹牴鎹郴缁燂紙鎴栬川鐐癸級鐨勫姞閫熷害浠ュ強瑙掑姞閫熷害寮曞叆鐩稿簲鐨勬儻鎬у姏锛屾妸鍔ㄥ姏瀛﹂棶棰樼洿鎺ュ彉鎴愰潤鍔涘闂锛涗笁銆佸垎鏋愬姏瀛︺備弗鏍肩殑璇寸浜岀鏂规硶瀹炶川涓婂氨鏄揪鏈楄礉灏斿師鐞嗙殑涓绉嶇嫮涔夎〃杩帮紝瀹冩槸鍒嗘瀽鍔涘鐨勫熀纭锛岃...
绛旓細n+3/4)鍛紙n=0锛1锛2锛3锛屸︼級锛岀粡鍘嗙殑鏃堕棿涓 t=锛坣+3/4)T锛坣=0锛1锛2锛3锛屸︼級璐ㄧ偣P鐨勯熺巼涓簐=2蟺R/T 鍦ㄥ悓鏍风殑鏃堕棿鍐咃紝璐ㄧ偣Q鍋氬寑鍔犻熺洿绾胯繍鍔紝閫熷害搴旇揪鍒皏锛岀敱鐗涢】绗簩瀹氬緥鍙婇熷害鍏紡寰 v=Ft/m 鑱旂珛浠ヤ笂涓夊紡锛岃В寰桭=8蟺Rm/锛4n+3锛塗^2锛坣=0锛1锛2锛3锛屸︼級
绛旓細甯﹀叆寰梤(min)=0.5m銆傝岀涓娆＄粫瀹屽崐鍦堛傚崐寰勫噺灏戜负80cm.绗簩娆60cm.绗笁娆＄洿鎺ュ噺灏戝埌40cm銆傛晠缁曚簡涓変釜鍗婂湀鐨勭灛闂寸怀鏂傝岀涓鍦堢殑鏃堕棿鏄痶1=蟺锛坮1锛/v=0.5蟺銆傜浜屽湀t2=蟺锛坮2锛/v=0.4蟺銆傚悓鐞嗙涓夊湀t3=0.3蟺銆鎵浠t=t1+t2+t3=1.2蟺銆傚笇鏈涗綘鑳藉鎴戠殑瑙ｇ瓟鎰熷埌婊℃剰銆
