谁能帮忙解答一下这道物理题,要详细的过程,谢谢了! 请帮忙解答一下这道物理题! 要有过程!
\u8c01\u80fd\u89e3\u91ca\u4e00\u4e0b\u8fd9\u9053\u7269\u7406\u9898\uff1f\u8981\u8be6\u7ec6\u8fc7\u7a0b\uff0c\u8c22\u8c22\u89e3\uff1a\u5148\u6c42AB\u7684\u4f53\u79ef\u4e4b\u6bd4\uff0c\u957f\u65b9\u4f53=\u5e95\u9762\u79efX\u9ad8\u3002VA\uff1aVB=SAXhA\uff1aSBXhB=\uff082X2\uff09\uff081X3\uff09=4\uff1a3\uff1b
\u6b64\u65f6\u7269\u4f53\u5bf9\u5730\u9762\u7684\u538b\u529bF=\u91cd\u529bG\uff0c\u6839\u636eF=PS\u53ef\u77e5\u5f53\u538b\u5f3aP\u4e00\u5b9a\u65f6\uff0c\u538b\u529bF\u4e0e\u53d7\u529b\u9762\u79efS\u6210\u6b63\u6bd4\uff0c\u6709\uff1aFA\uff1aFB=SA\uff1aSB=2\uff1a3\uff1b
\u518d\u6839\u636eG=mg\u6709\uff1amA\uff1amB=GA\uff1aGB=FA\uff1aFB=2\uff1a3\uff1b
\u53c8\u6839\u636ep=m/V\u6709\uff1apA\uff1apB=\uff08mA/VA\uff09\uff1a\uff08mB/VB\uff09=\uff08mA/mB\uff09\uff08VB/VA\uff09=\uff082/3\uff09\uff083/4\uff09=1/2\uff1b
\u7b80\u5355
\u9996\u5148\uff0c\u65e0\u89c6\u6389AC,CB\uff0c\u5047\u5982\u53ea\u6709AB\uff0cAB\u4e0a\u662f\u65e0\u9650\u5bbd\u5e7f\u7684\u78c1\u573a\u7684\u8bdd\uff0c\u7531\u7c92\u5b50\u5782\u76f4\u4e8e\u78c1\u573a\u8fb9\u754c\u5c04\u5165\uff0c\u6613\u8bc1\uff0c\u7c92\u5b50\u5c06\u5728\u78c1\u573a\u4e2d\u8d70\u534a\u4e2a\u5706\uff0c\u6700\u540e\u7531AB\u6240\u5728\u76f4\u7ebf\u4e0aP\u70b9\u53f3\u4fa7\u7684\u53e6\u4e00\u70b9\u5c04\u51fa\uff0c\u5706\u5fc3\u5728AB\u4e0a
\u5176\u6b21\uff0c\u901a\u8fc7\u5411\u5fc3\u529b\u7b49\u4e8e\u5e93\u4f26\u5179\u529b\uff0cv^2/R * m=Bqv,\u5f97\u51fa\uff0c\u6b64\u534a\u5706\u7684\u534a\u5f84R\u4e3a 3½/4 * L
\u8fdb\u800c\uff0c\u8981\u6c42\u4eceQ\u70b9\u5c04\u51fa\uff0c\u5373\u8981\u6c42\u4e0eBC\u6709\u4ea4\u70b9\uff0c\u6240\u4ee5\u6b64\u65f6\u5728\u56fe\u4e2d\u52a0\u4e0aBC\uff0c\u800c\u6613\u8bc1\uff0c\u968f\u7740\u534a\u5706\u7531\u53f3\u5411\u5de6\u79fb\uff0c\u5f53P\u70b9\u5728\u6700\u5de6\u5904\u65f6\uff0c\u534a\u5706\u4e0eBC\u76f8\u5207\uff0c\u5373\u6b64\u65f6BC\u4e0a\u67d0\u70b9\u4e3a\u5207\u70b9\uff08Q\uff09\uff0c\u8fde\u63a5Q\u4e0e\u5706\u5fc3\uff08\u8bbe\u4e3aO\uff09\uff0cOQ\u5782\u76f4\u4e8eBC\uff0cBQO\u4e3a\u4e0030,60,90\u7684\u76f4\u89d2\u4e09\u89d2\u5f62\uff0cQ\u5728\u5706\u4e0a\uff0cOQ=3½/4 * L\uff0c\u6613\u8bc1\uff0c\u6b64\u65f6OB\u4e3a1/2 * L\uff0cP\u5728\u5706\u4e0a\uff0cOP=3½/4 * L\uff0c\u540c\u65f6\uff0c\u7c92\u5b50\u4e0d\u80fd\u4eceAC\u98de\u51fa\uff0c\u52a0\u4e0aAC\uff0c\u4ee3\u5165\u9a8c\u8bc1\uff0c\u6613\u8bc1\uff0c\u6b64\u65f6\u534a\u5706\u6070\u597d\u5207AC\uff0c\u662f\u4ee5\uff0cOP+OB\uff0c\u9009A
\u7ee7\u7eed\uff0c\u6613\u8bc1\uff0cQB\u6700\u5927\u65f6\uff0cQ\u6700\u9ad8\uff08Q\u5728BC\u4e0a\uff09\uff0c\u662f\u4ee5\uff0c\u4ea4\u70b9\u8d8a\u9ad8\uff0cQB\u8d8a\u957f\uff0c\u800c\u534a\u5706\u6700\u9ad8\u5904\u65e0\u7591\u662f\u5706\u5fc3\u6b63\u4e0a\u65b9\u7684\u90a3\u4e2a\u70b9\uff0c\u6b64\u65f6\uff0cQBO\u4e3a\u4e00\u4e2a30,60,90\u7684\u76f4\u89d2\u4e09\u89d2\u5f62\uff0cOQ=3½/4 * L\uff0cQB\u4e3a1/2 * L\uff0c\u9009D
分析:1.光滑指不计摩擦力。
2.设小物块对斜面的正压力为N,小物重力为G,N/G=COSθ,
N=GCOSθ=mgCOSθ
对M:Nsina=Ma a为光滑斜面体加速度
对m:以M为参考系:N+masina=mgcosa ma为惯性力
消去a,得N=(自己算吧)
(你错了,光滑斜面体不是固定的,有加速度,不是惯性参考系,不能这么算)
绛旓細瑙o細锛1锛夋按鐨勮川閲弇姘=蟻V=1.0脳103kg/m3脳0.15m3=150kg锛岀儹姘村櫒瀵规按骞冲彴鐨勫帇鍔涳細F=G=锛坢鍣+m姘达級g=锛50kg+150kg锛壝10N/kg=2000N锛岀儹姘村櫒瀵规按骞冲彴鐨勫帇寮猴細p=FS=2000N 0.1m2=20000Pa锛涳紙2锛夌儹姘村櫒姣忓ぉ鎺ュ彈鐨勫お闃宠緪灏勮兘锛歐=900J/锛坰锛巑2锛壝8脳3600s脳2.0m2=5.184脳107J锛...
绛旓細(2)鈭慚A=0 -2r.cos胃.2m.g+2r.sin胃.NB=0 (3) (A涓哄崐鐞冨渾蹇冿級鏈澶ч潤鎽╂摝鍏崇郴寮忥細 F=0.5NA (4)浠ヤ笂鍥涗釜鏂圭▼鑱旂珛姹傚緱锛 NB=F=1.5m.g 銆丯A=3m.g tan胃=4/3 L=2r.cos胃+r=2r.(3/5)+r=11r/5 *鍘熼鏃犳閫夐」锛
绛旓細涓銆 鏈変竴鏉按锛岃川閲忎负5鍗冨厠锛屽崌楂樻俯搴20鎽勬皬搴︼紝鍚告敹鐑噺涓哄灏戙傚惛鏀剁儹閲 涓簃ct鍙樺寲=100c c涓烘按鐨勬瘮鐑 浜屻 浣撶Н涓0.005绫3鐨勪竴涓墿浣擄紝娴告病鍦ㄦ按涓紝鍙楀埌鐨勬诞鍔涗负澶氬皯锛焢姘磄V=1000*10*0.005=50N 涓夈 鏈変竴涓鍣紝璐ㄩ噺涓0.5鍗冨厠锛屼綋绉负0.003绫3锛屽簳闈㈢Н涓0.02绫2锛岃婊℃按锛屾按娣...
绛旓細缁嗙妫嶇殑妯埅闈负S,鐭冲潡鐨勫瘑搴︿负蟻鐭 涓ゆ鍧囦负婕傛诞,娴姏绛変簬鎬婚噸,鐩稿悓 蟻姘磄(V鐭+0.232*S)=蟻鐓ゆ补g(V鐭+0.302*S)瑙e緱 V鐭=0.048S 鍐嶇敱姘翠腑婕傛诞鏃, F娴 =G鐭+G妫 寰 蟻姘磄(V鐭+23.2*S)=(0.024+0.018)*10 V鐭+23.2*S=0.42x10^-4 灏哣鐭=0.048S浠e叆寰: 0....
绛旓細鍦ㄨ繖涓灛闂翠箣鍓嶏紝B鍚戝彸杩愬姩浜嗕竴绫筹紝鐢变簬AB瀹屽叏瀵圭О锛孉涔熷簲鍚戝乏绉诲姩浜嗕竴绫筹紝灏氫綑涓绫崇鍒板乏杈圭殑閽夊瓙锛孉鐨勯熷害鏄剧劧鏄4m/s鍚戝乏锛岄偅涔圔纰板埌閽夊瓙涔嬪悗锛孉鐩稿浜庤溅灏辨湁浜4+12/7=40/7m/s鐨勭浉瀵归熷害銆傚湪杩欎竴閫熷害涓嬶紝涓绫崇殑璺濈锛屼竴涓畝鍗曠殑鐩搁亣闂鍗冲彲寰楀嚭锛屽湪7/40绉掑悗锛孉涔熶細閽夊湪閽夊瓙涓娿侫閽夊湪...
绛旓細鏂紑鏃讹紝绠鍗曠殑鍒嗗帇 P鏈涓婃椂 鏈澶э紝U=Uab=8V;P鏈涓嬫椂鏈灏忥紝鍒嗗帇锛孶=U*R2/(R1+R2)=4.8V 鎵浠ユ槸4.8-8V 闂悎鏃讹紝R1涓嬮儴鍜孯2骞惰仈鍚 涓嶳1鐨勪笂閮ㄥ垎鍘 P鏈涓婃椂 鏈澶э紝U=Uab=8V;P鏈涓嬫椂鏈灏忥紝(鐭矾锛屼笉鐢ㄥ垎鍘嬪仛浜嗭級锛孶=0 鎵浠ユ槸0-8V 鎵撳瓧涓嶅鏄擄紝鍝ヤ滑锛岃拷鍔犱簺鍒嗗惂~...
绛旓細閲嶅績楂樺害澶х害鏄0.9绫筹紝楂樺害鍙樺寲涓篽 = 1.8 - 0.9 = 0.9绫炽俶gh = (mV^2)/2 V^2 = 2gh 鈮2*9.8*0.9 = 17.64 V = 4.2绫/绉
绛旓細尾=-(4蟺^2蠁0/T^2)cos(2蟺t/T)銆傚垵鐬椂锛屽嵆t=0锛岄偅涔坈os0=1,sin0=0銆傚洜姝ゆ湁蠅=0锛屛=-(4蟺^2蠁0/T^2)锛屽墠闈㈢殑璐熷彿鍙槸琛ㄧず鏂瑰悜涓庤浣嶇Щ鐨勬柟鍚戠浉鍙嶏紙涔熷氨鏄浣嶇Щ杩滅骞宠 浣嶇疆鏃讹紝瑙掑姞閫熷害鎸囧悜骞宠 浣嶇疆锛锛屽彲浠蹇界暐锛屽彧鍙栫粷瀵瑰笺傚張鏈塻=蠁l锛寁=蠅l锛宎=尾l锛屽洜姝ゆ湁v=0,a=4...
绛旓細鍏堝亣璁綛鎭板ソ鑳借鎷夊姩锛屽B 杩涜鍙楀姏鍒嗘瀽锛屽彈鍒癆鐨勬懇鎿﹀姏涓5脳0.2锛1N锛屽彈鍒板湴闈㈢殑鎽╂摝鍔涗负锛5锛8锛壝0.2锛2.6锛屽垯F锛1锛2.6锛3.6N銆傚啀瀵笰杩涜鍙楀姏鍒嗘瀽锛孴=f=5*0.2=1N銆
绛旓細鍒楄溅缁忚繃涔欑珯鏃剁殑閫熷害V=鍔犻熸鏈=鍑忛熸鍒濋 浠庣敳绔欏嚭鍙,琛ㄧず鍒濋熷害=0 鍔犻熸骞冲潎閫熷害(V/2)=鍑忛熸骞冲潎閫熷害(V/2)=鍏ㄧ▼骞冲潎閫熷害V'V=2V'=2*鎬讳綅绉籗/鎬绘椂闂碩=24km/24min=2km/min 涓ゆ鍔犻熷害鐨勫ぇ灏忕浉绛夛紝璁句负a銆傝琛岄┒涓ゆ鐨勬椂闂村垎鍒负t鍜宼'鍥燰=at'=at 鏁卼=t'=鎬绘椂闂碩/2 鐢茬珯...