高一物理卷子求标准答案
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t=4s
\u6b64\u65f6\u6c7d\u8f66\u901f\u5ea64*3=12m/s
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19画出速度-时间图像，立马解决
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绛旓細8.銆绛旀銆慍 銆愯В鏋愩戜袱鍒嗗姏F1銆丗2鐨勫悎鍔汧鐨勫彇鍊艰寖鍥翠负| F1-F2|鈮鈮1+F2,鐢遍鎰忓彲鐭,20N鈮2鈮80N,鎵浠ュ彧鏈塁姝ｇ‘銆9.銆愮瓟妗堛慍 銆愯В鏋愩戝鏋滀竴涓姏鐨勪綔鐢ㄦ晥鏋滃叾瀹冨嚑涓姏鍚屾椂浣滅敤鐨勬晥鏋滅浉鍚,杩欎釜鍔涘氨鏄叾瀹冨嚑涓姏鐨勫悎鍔涖傝涓ゅ垎鍔涗负F1銆丗2,鍚堝姏F鐨勫彇鍊艰寖鍥翠负| F1-F2|鈮鈮1+F2,鍥犳鍚堝姏鐨勫ぇ灏忎笉...
绛旓細(1)鐢变簬姘村叿鏈夋儻鎬э紝鍙涓轰竴涓墿浣撱傚垰濂戒娇鐗╀綋鍒版渶楂樼偣鏃讹紝鎷夊姏T=0锛屾墍浠鍚戝績鍔=mg F鍚=G = mg =5 N 鎵浠ュ悜蹇冨姞閫熷害a = 5N/0.5kg = 10(绫虫瘡绉掓柟) =(v^2 )/ L = (v^2)/0.6m = 10(绫虫瘡绉掓柟)鍙В寰 v = 鏍瑰彿6 锛2锛夊洜涓簐 = 3m/s 鎵浠ュ悜蹇冨姞閫熷害 a = (v^2...
绛旓細F姘村钩鏂瑰悜(鍚戝乏)鐨勫垎鍔汧cos伪 婊戝姩鎽╂摝鍔(鍚戝彸)渭N(N涓虹珫鐩存柟鍚戝悜涓嬬殑鍘嬪姏)绔栫洿鏂瑰悜鍙楀姏鍒嗘瀽锛欶绔栫洿鏂瑰悜(鍚戜笂)鐨勫垎鍔汧sin伪 鐗╀綋鎵鍙楅噸鍔(鍚戜笅)G 鍒欐鍘嬪姏N=G-Fsin伪 鐢变簬鍖閫熻繍鍔紝鎵浠ユ按骞虫柟鍚戝彈鍚堝鍔涗负0(璁惧悜宸︿负姝ｆ柟鍚)鍒欐湁Fcos伪-渭(G-Fsin伪)=0 Fcos伪+渭Fsin伪=渭G F(cos伪+...
绛旓細鑰冭檻杩欎釜鍥犵礌锛岀伀绠彂灏勫満搴斿缓鍦ㄧ含搴﹁緝 锛堝～楂樻垨浣庯級鐨勫湴鏂硅緝濂姐傚弬鑰绛旀 1. .D 2.A 3.D 4.C 5.B 6.C 7AC 8BD 8ABD 10BD 11锛庘墹7.9km/s锛屸墺8锛4鍒嗭級 12锛 銆乬/4銆 銆 13锛20m/s 14锛1.75m/s 15锛庤タ銆佷笢銆佷綆 16锛 锛4鍒嗭級...
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绛旓細浠庤孫B鐨勬媺鍔涙槸100/cos60=200N O澶勪簬骞宠 鐘舵侊紝鎵浠C鐨勬媺鍔涘拰OB鐨勬媺鍔涚殑姘村钩鍒嗗姏骞宠 涔熷氨鏄紝OC鐨勬媺鍔涙槸200脳sin60=100鏍瑰彿3 N 绗簩棰橈細璁惧湴鐞冭川閲忎负M锛屽紩鍔涘父閲忎负G锛屽湴鐞冭〃闈换涓鐗╀綋璐ㄩ噺涓簃锛屽垯GMm/R^2=mg锛岃В鍑篗锛岀劧鍚庢牴鎹甅=瀵嗗害脳浣撶Н锛孷=4/3脳蟺脳R^3锛岀畻鍑哄瘑搴 ...
绛旓細(1)鐢卞钩鍧囬熷害娉曞叕寮忓彲鍒嗗埆姹傚嚭2锛5涓や釜鐐圭殑鐬椂閫熷害 v2=(0.0028+0.0032)/0.004=1.50 m/s v5=(0.004+0.0043)/0.004=2.08 m/s 2锛5涓や釜鐐逛箣闂寸殑璺濈h=0.108 m 鎵浠ラ噸鍔涘娍鑳界殑鍑忓皯閲忊柍Ep=mgh=1.06 mJ 鍔ㄨ兘鐨勫鍔犻噺鈻矱k=1/2m(V5)^2-1/2m(V2)^2=1.04mJ 姣旇緝鈻矱p鍜屸柍...
绛旓細鎵浠ュ钩鍧囬熷害灏辨槸V=AB/鈻硉 缁撴灉搴旇鏄2.9m/s 杩樻湁涓绉嶆儏鍐碉紝灏辨槸杞﹁浇MN宸︿晶鏃跺欙紝灏勫埌杞︿笂锛屾鏃跺す瑙掍负45掳锛屾敼鍙樹簡15掳鍚庯紝绗簩娆″皠鍒拌溅涓娿傛鏃朵笌绔栫洿鏂瑰悜澶硅涓30掳銆傛鏃剁殑AB=d(tan45掳-tan30掳)V=AB/鈻硉=1.7m/s 浣犺嚜宸卞啀绠楃畻銆備笉鎳傚啀闂備富瑕佹槸鐢诲嚭绀烘剰鍥俱
