sin181度等于cos多少度
绛旓細鏈ㄥ潡娌挎枩闈㈠悜涓嬫粦鍔ㄦ椂锛屽彈閲嶅姏mg銆佹敮鎸佸姏N銆佹粦鍔ㄦ懇鎿﹀姏 f 銆傚皢鍚勫姏姝ｄ氦鍒嗚В鍦ㄥ钩琛屼簬鏂滈潰鍜屽瀭鐩翠簬鏂滈潰鏂瑰悜锛屽緱 N锛漨g*cos37搴 f 锛µ*N锛µ*mg*cos37搴 鎵姹傜殑鍚堝姏鏄銆F鍚堬紳mg*sin37搴︼紞f 锛漨g*锛坰in37搴︼紞µ*cos37搴︼級鍗炽F鍚堬紳2*10*锛0.6锛0.5*0.8锛夛紳4 鐗涖...
绛旓細寰椼a1锛漡*(sin37搴︼紜µ*cos37搴)锛10*锛0.6锛0.5*0.8锛夛紳10 m/s^2 a1鐨勬柟鍚鏄娌挎枩闈㈠悜涓 鑳藉悜涓婃粦琛岀殑鏈澶ц窛绂绘槸S锛漋0^2 / (2*a1)锛5^2 / 锛2*10锛夛紳1.25绫 褰撶墿浣撳悜涓嬫粦鏃讹紝鍙楅噸鍔沵g銆佹敮鎸佸姏N銆佹粦鍔ㄦ懇鎿﹀姏 f2锛堟部鏂滈潰鍚戜笂锛夎繖鏃剁殑鍔犻熷害澶у皬鏄a2锛(mg*sin37搴...
绛旓細瑙ｏ細sin²锛堬紙B+C锛/2锛+cos 2A=sin²[90掳-(A/2锛塢+cos2A =cos²(A/2)+cos2A=(1+cosA)/2+2cos²A-1 =(1+4/5)/2+2*(4/5)²-1 =9/10+7/25=59/50.鑻=2锛屼笁瑙掑舰鐨勯潰绉疭=3锛屾眰a 鈭礳osA=4/5>0,鈭碅鏄閿愯锛屾晠sinA=3/5 S=(1/2)...
绛旓細sin1+sin181=0,sin2+sin182=0,.sin179+sin359=0 sin1+sin2+sin3+.+sin360=0
绛旓細F*锛cos胃锛µ*sin胃锛夛紲 mg*锛坰in胃锛µ*cos胃锛夊彲瑙侊紝褰撱锛坈os胃锛µ*sin胃锛夛紳0銆鏃讹紝涓嶇澶氬ぇ鐨勬按骞冲姏F锛屼互涓婁笉绛夊紡涓瀹氭垚绔嬨傚嵆銆tan胃锛1 / µ锛1 / tan30搴︼紳鏍瑰彿3 寰椼胃锛60搴 杩欎竴涓寸晫瑙掔殑澶у皬鏄60搴︺傦紙2锛夎嫢淇濇寔鏂滈潰鍊捐30搴︿笉鍙橈紝鍦ㄧ珫鐩村钩闈㈠唴...
绛旓細鑰冨療骞宠 鐭ヨ瘑鍜岀墰椤跨浜屽畾寰 鏂滈潰涓婄殑绠卞瓙鍙楀埌绔栫洿鍚戜笅鐨勯噸鍔汫 鍨傜洿鏂滈潰鍚戜笂鐨勬敮鎸佸姏Fn 娌挎枩闈㈠悜涓婄殑鎽╂摝鍔 濡傚浘 璁炬枩闈㈠捐涓伪 鍒欙細伪=37搴︽椂 鐢辩瀛愰潤姝 鏈 f=渭mgcos37 mgsin37= 渭mgcos37 鈶 寰椢=3/4 伪=53搴︽椂 鏈 mgsin53-渭mgcos53=ma 鈶 鐢扁憼鈶¤В寰 ...
绛旓細a=g锛sin胃-µcos胃锛 鈥︹︼紙2锛変竴銆佸叧浜庨熷害澶у皬鐨勯棶棰 1銆佸綋姘村钩浣嶇Щ鐩稿悓鏃讹細绔栫洿浣嶇Щh瓒婂ぇ锛屾枩闈涓庡簳杈箂x鐨勫す瑙捨歌秺澶э紝Ep=mgh瓒婂ぇ锛學f=µmgLcos胃=µmgs涓嶅彉锛孍p-Wf 瓒婂ぇ锛岀敱锛1锛夌煡锛孍k瓒婂ぇ銆傝嫢鏂滈潰鍏夋粦锛岋紙1锛夊彉涓篍k=Ep锛岀粨璁虹浉鍚屻傛晠寰楃粨璁轰竴锛氬綋姘村钩浣嶇Щ鐩稿悓...
绛旓細鎵姹傜殑澶栧姏澶у皬鏄銆F锛漨g /锛cos胃锛µ*sin胃锛夊綋鐗╀綋鍚戜笅鍖閫熸粦鍔ㄦ椂锛岀墿浣撳彈閲嶅姏mg銆佸缁欑殑寮瑰姏N2锛堟按骞筹級銆佸鍔汧銆佹粦鍔ㄦ懇鎿﹀姏 f2锛堢珫鐩村悜涓嬶級銆傚悎鍔涗负0 鐢ㄦ浜ゅ垎瑙ｆ硶锛屽皢鍚勫姏姝ｄ氦鍒嗚В鍦ㄦ按骞冲拰绔栫洿鏂瑰悜 姘村钩锛孎*sin胃锛漀2 绔栫洿锛孎*cos胃锛 f2锛漨g 涓斻f2锛µ*N2 浠ヤ笂涓夊紡鑱旂珛寰...
绛旓細鎵姹傜殑鍔犻熷害鏄銆a锛漡*锛sin37搴︼紞µ*cos37搴︼級锛10*锛0.6锛0.3*0.8锛夛紳3.6 m/s^2 2銆乂0锛5m/s锛孲锛5绫 鐢便V^2锛漋0^2锛2aS銆寰 鎵姹傜殑閫熷害鏄V锛濇牴鍙凤紙V0^2锛2aS锛夛紳鏍瑰彿锛5^2锛2*3.6*5锛夛紳鏍瑰彿61锛7.81 m/s ~濡傛灉浣犺鍙垜鐨勫洖绛旓紝璇峰強鏃剁偣鍑汇愰噰绾涓...
绛旓細涓斻f1锛µ*N1 浠ヤ笂涓夊紡鑱旂珛锛屽緱銆F*cos37搴︼紳µ*锛坢g锛婩*sin37搴︼級寰楀姩鎽╂摝鍥犳暟鏄µ锛滷*cos37搴 /锛坢g锛婩*sin37搴︼級锛100*0.8 /锛4*10锛100*0.6锛夛紳0.8 璁炬湪绠卞師鏉ュ寑閫熻繍鍔ㄧ殑閫熷害鏄疺锛屾挙鍘籉鍚庢粦琛岀殑璺濈鏄 S 鍦ㄦ挙鍘绘帹鍔汧浠ュ悗锛屾湪绠卞彈閲嶅姏mg銆佹敮鎸佸姏N2銆佹粦鍔...
