|
2020骞存櫘閫氶珮绛夊鏍℃嫑鐢熷叏鍥界粺涓€鑰冭瘯 鐞嗙缁煎悎鑳藉姏娴嬭瘯 娉ㄦ剰浜嬮」锛?/span> 1锛庣瓟鍗峰墠锛岃€冪敓鍔″繀灏嗚嚜宸辩殑濮撳悕銆佸噯鑰冭瘉鍙峰～鍐欏湪绛旈鍗′笂銆?/span> 2锛?/span>鍥炵瓟閫夋嫨棰樻椂锛岄€夊嚭姣忓皬棰樼瓟妗堝悗锛岀敤閾呯瑪鎶婄瓟棰樺崱涓婂搴旈鐩殑绛旀鏍囧彿娑傞粦锛屽闇€鏀瑰姩锛岀敤姗＄毊鎿﹀共鍑€鍚庯紝鍐嶉€夋秱鍏跺畠绛旀鏍囧彿銆傚洖绛旈潪閫夋嫨棰樻椂锛屽皢绛旀鍐欏湪绛旈鍗′笂锛屽啓鍦ㄦ湰璇曞嵎涓婃棤鏁堛€傘€?/span> 3锛?/span>鑰冭瘯缁撴潫鍚庯紝灏嗘湰璇曞嵎鍜岀瓟棰樺崱涓€骞朵氦鍥炪€?/span> 鍙兘鐢ㄥ埌鐨勭浉瀵瑰師瀛愯川閲忥細H 1聽 C 12聽 N 14聽 O 16聽 Na 23聽 Al 27聽 P 31聽 Cl 35.5聽 Ar 40聽 V 51聽 Fe 56 浜屻€侀€夋嫨棰橈細鏈鍏?/span>8灏忛锛屾瘡灏忛6鍒嗐€傚叡48鍒嗐€傚湪姣忓皬棰樼粰鍑虹殑鍥涗釜閫夐」涓紝绗?/span>14~18棰樺彧鏈変竴椤圭鍚堥鐩姹傦紝绗?/span>19~21棰樻湁澶氶」绗﹀悎棰樼洰瑕佹眰銆傚叏閮ㄩ€夊鐨勫緱6鍒嗭紝閫夊浣嗕笉鍏ㄧ殑寰?/span>3鍒嗭紝鏈夐€夐敊鐨勫緱0鍒嗐€?/span> 14锛庤椹朵腑鐨勬苯杞﹀鏋滃彂鐢熷墽鐑堢鎾烇紝杞﹀唴鐨勫畨鍏ㄦ皵鍥婁細琚脊鍑哄苟鐬棿鍏呮弧姘斾綋銆傝嫢纰版挒鍚庢苯杞︾殑閫熷害鍦ㄥ緢鐭椂闂村唴鍑忓皬涓洪浂锛屽叧浜庡畨鍏ㄦ皵鍥婂湪姝よ繃绋嬩腑鐨勪綔鐢紝涓嬪垪璇存硶姝ｇ‘鐨勬槸 A锛庡鍔犱簡鍙告満鍗曚綅闈㈢Н鐨勫彈鍔涘ぇ灏?/span> B锛庡噺灏戜簡纰版挒鍓嶅悗鍙告満鍔ㄩ噺鐨勫彉鍖栭噺 C锛庡皢鍙告満鐨勫姩鑳藉叏閮ㄨ浆鎹㈡垚姹借溅鐨勫姩鑳?/span> D锛庡欢闀夸簡鍙告満鐨勫彈鍔涙椂闂村苟澧炲ぇ浜嗗徃鏈虹殑鍙楀姏闈㈢Н 15锛庣伀鏄熺殑璐ㄩ噺绾︿负鍦扮悆璐ㄩ噺鐨?/span>1/10锛屽崐寰勭害涓哄湴鐞冨崐寰勭殑1/2锛屽垯鍚屼竴鐗╀綋鍦ㄧ伀鏄熻〃闈笌鍦ㄥ湴鐞冭〃闈㈠彈鍒扮殑寮曞姏鐨勬瘮鍊肩害涓?/span> A锛?/span>0.2聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 B锛?/span>0.4聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 C锛?/span>2.0聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 D锛?/span>2.5 16锛庡鍥撅紝涓€鍚屽琛ㄦ紨鑽＄鍗冦€傚凡鐭ョ鍗冪殑涓ゆ牴缁抽暱鍧囦负10 m锛岃鍚屽鍜岀鍗冭笍鏉跨殑鎬昏川閲忕害涓?/span>50 kg銆傜怀鐨勮川閲忓拷鐣ヤ笉璁★紝褰撹鍚屽鑽″埌绉嬪崈鏀灦鐨勬涓嬫柟鏃讹紝閫熷害澶у皬涓?/span>8 m/s锛屾鏃舵瘡鏍圭怀瀛愬钩鍧囨壙鍙楃殑鎷夊姏绾︿负
A锛?/span>200 N聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 B锛?/span>400 N聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 C锛?/span>600 N聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 D锛?/span>800 N 17锛庡浘锛?/span>a锛夋墍绀虹殑鐢佃矾涓紝K涓?/span>L闂存帴涓€鏅鸿兘鐢垫簮锛岀敤浠ユ帶鍒剁數瀹瑰櫒C涓ょ鐨勭數鍘?/span>UC銆傚鏋?/span>UC闅忔椂闂?/span>t鐨勫彉鍖栧鍥撅紙b锛夋墍绀猴紝鍒欎笅鍒楁弿杩扮數闃?/span>R涓ょ鐢靛帇UR闅忔椂闂?/span>t鍙樺寲鐨勫浘鍍忎腑锛屾纭殑鏄?/span>
18锛庝竴鍖€寮虹鍦虹殑纾佹劅搴斿己搴﹀ぇ灏忎负B锛屾柟鍚戝瀭鐩翠簬绾搁潰鍚戝锛屽叾杈圭晫濡傚浘涓櫄绾挎墍绀猴紝
A锛?/span> 19锛庝笅鍒楁牳鍙嶅簲鏂圭▼涓紝X1锛?/span>X2锛?/span>X3锛?/span>X4浠ｈ〃伪绮掑瓙鐨勬湁 A锛?/span> C锛?/span> 20锛庝竴鐗╁潡鍦ㄩ珮3.0 m銆侀暱5.0 m鐨勬枩闈㈤《绔粠闈欐寮€濮嬫部鏂滈潰涓嬫粦锛屽叾閲嶅姏鍔胯兘鍜屽姩鑳介殢涓嬫粦璺濈s鐨勫彉鍖栧鍥句腑鐩寸嚎鈪犮€佲叀鎵€绀猴紝閲嶅姏鍔犻€熷害鍙?/span>10 m/s2銆傚垯
A锛庣墿鍧椾笅婊戣繃绋嬩腑鏈烘鑳戒笉瀹堟亽 B锛庣墿鍧椾笌鏂滈潰闂寸殑鍔ㄦ懇鎿﹀洜鏁颁负0.5 C锛庣墿鍧椾笅婊戞椂鍔犻€熷害鐨勫ぇ灏忎负6.0 m/s2 D锛庡綋鐗╁潡涓嬫粦2.0 m鏃舵満姊拌兘鎹熷け浜?/span>12 J 21锛庡鍥撅紝U褰㈠厜婊戦噾灞炴abcd缃簬姘村钩缁濈紭骞冲彴涓婏紝ab鍜?/span>dc杈瑰钩琛岋紝鍜?/span>bc杈瑰瀭鐩淬€?/span>ab銆?/span>dc瓒冲闀匡紝鏁翠釜閲戝睘妗嗙數闃诲彲蹇界暐銆備竴鏍瑰叿鏈変竴瀹氱數闃荤殑瀵间綋妫?/span>MN缃簬閲戝睘妗嗕笂锛岀敤姘村钩鎭掑姏F鍚戝彸鎷夊姩閲戝睘妗嗭紝杩愬姩杩囩▼涓紝瑁呯疆濮嬬粓澶勪簬绔栫洿鍚戜笅鐨勫寑寮虹鍦轰腑锛?/span>MN涓庨噾灞炴淇濇寔鑹ソ鎺ヨЕ锛屼笖涓?/span>bc杈逛繚鎸佸钩琛屻€傜粡杩囦竴娈垫椂闂村悗
A锛庨噾灞炴鐨勯€熷害澶у皬瓒嬩簬鎭掑畾鍊?/span> B锛庨噾灞炴鐨勫姞閫熷害澶у皬瓒嬩簬鎭掑畾鍊?/span> C锛庡浣撴鎵€鍙楀畨鍩瑰姏鐨勫ぇ灏忚秼浜庢亽瀹氬€?/span> D锛庡浣撴鍒伴噾灞炴bc杈圭殑璺濈瓒嬩簬鎭掑畾鍊?/span> 涓夈€侀潪閫夋嫨棰橈細鍏?/span>174鍒嗭紝绗?/span>22~32棰樹负蹇呰€冮锛屾瘡涓瘯棰樿€冪敓閮藉繀椤讳綔绛斻€傜33~38棰樹负閫夎€冮锛岃€冪敓鏍规嵁瑕佹眰浣滅瓟銆?/span> 锛堜竴锛夊繀鑰冮锛氬叡129鍒嗐€?/span> 22锛庯紙6鍒嗭級 鏌愬悓瀛︾敤浼忓畨娉曟祴閲忎竴闃诲€间负鍑犲崄娆у鐨勭數闃?/span>Rx锛屾墍鐢ㄧ數鍘嬭〃鐨勫唴闃讳负1 k惟锛岀數娴佽〃鍐呴樆涓?/span>0.5惟銆傝鍚屽閲囩敤涓ょ娴嬮噺鏂规锛屼竴绉嶆槸灏嗙數鍘嬭〃璺ㄦ帴鍦ㄥ浘锛?/span>a锛夋墍绀虹數璺殑O銆?/span>P涓ょ偣涔嬮棿锛屽彟涓€绉嶆槸璺ㄦ帴鍦?/span>O銆?/span>Q涓ょ偣涔嬮棿銆傛祴閲忓緱鍒板鍥撅紙b锛夋墍绀虹殑涓ゆ潯U鈥?/span>I鍥剧嚎锛屽叾涓?/span>U涓?/span>I鍒嗗埆涓虹數鍘嬭〃鍜岀數娴佽〃鐨勭ず鏁般€?/span>
鍥炵瓟涓嬪垪闂锛?/span> 锛?/span>1锛夊浘锛?/span>b锛変腑鏍囪涓?/span>II鐨勫浘绾挎槸閲囩敤鐢靛帇琛ㄨ法鎺ュ湪________锛堝～鈥?/span>O銆?/span>P鈥濇垨鈥?/span>O銆?/span>Q鈥濓級涓ょ偣鐨勬柟妗堟祴閲忓緱鍒扮殑銆?/span>
锛?/span>2锛夋牴鎹墍鐢ㄥ疄楠屽櫒鏉愬拰鍥撅紙b锛夊彲鍒ゆ柇锛岀敱鍥剧嚎________锛堝～鈥?/span>I鈥濇垨鈥?/span>II鈥濓級寰楀埌鐨勭粨鏋滄洿鎺ヨ繎寰呮祴鐢甸樆鐨勭湡瀹炲€硷紝缁撴灉涓?/span>________惟锛堜繚鐣?/span>1浣嶅皬鏁帮級銆?/span> 锛?/span>3锛夎€冭檻鍒板疄楠屼腑鐢佃〃鍐呴樆鐨勫奖鍝嶏紝闇€瀵癸紙2锛変腑寰楀埌鐨勭粨鏋滆繘琛屼慨姝ｏ紝淇鍚庡緟娴嬬數闃荤殑闃诲€间负________惟锛堜繚鐣?/span>1浣嶅皬鏁帮級銆?/span> 23锛庯紙9鍒嗭級 鏌愬悓瀛︾敤濡傚浘鎵€绀虹殑瀹為獙瑁呯疆楠岃瘉鍔ㄩ噺瀹氱悊锛屾墍鐢ㄥ櫒鏉愬寘鎷細姘斿灚瀵艰建銆佹粦鍧楋紙涓婃柟瀹夎鏈夊搴︿负d鐨勯伄鍏夌墖锛夈€佷袱涓笌璁＄畻鏈虹浉杩炴帴鐨勫厜鐢甸棬銆佺牆鐮佺洏鍜岀牆鐮佺瓑銆?/span> 瀹為獙姝ラ濡備笅锛?/span>
锛?/span>1锛夊紑鍔ㄦ皵娉碉紝璋冭妭姘斿灚瀵艰建锛岃交鎺ㄦ粦鍧楋紝褰撴粦鍧椾笂鐨勯伄鍏夌墖缁忚繃涓や釜鍏夌數闂ㄧ殑閬厜鏃堕棿________鏃讹紝鍙涓烘皵鍨杞ㄦ按骞筹紱 锛?/span>2锛夌敤澶╁钩娴嬬牆鐮佷笌鐮濈爜鐩樼殑鎬昏川閲?/span>m1銆佹粦鍧楋紙鍚伄鍏夌墖锛夌殑璐ㄩ噺m2锛?/span> 锛?/span>3锛夌敤缁嗙嚎璺ㄨ繃杞昏川瀹氭粦杞皢婊戝潡涓庣牆鐮佺洏杩炴帴锛屽苟璁╃粏绾挎按骞虫媺鍔ㄦ粦鍧楋紱 锛?/span>4锛変护婊戝潡鍦ㄧ牆鐮佸拰鐮濈爜鐩樼殑鎷夊姩涓嬩粠宸﹁竟寮€濮嬭繍鍔紝鍜岃绠楁満杩炴帴鐨勫厜鐢甸棬鑳芥祴閲忓嚭閬厜鐗囩粡杩?/span>A銆?/span>B涓ゅ鐨勫厜鐢甸棬鐨勯伄鍏夋椂闂?/span>螖t1銆?/span>螖t2鍙婇伄鍏夌墖浠?/span>A杩愬姩鍒?/span>B鎵€鐢ㄧ殑鏃堕棿t12锛?/span> 锛?/span>5锛夊湪閬厜鐗囬殢婊戝潡浠?/span>A杩愬姩鍒?/span>B鐨勮繃绋嬩腑锛屽鏋滃皢鐮濈爜鍜岀牆鐮佺洏鎵€鍙楅噸鍔涜涓烘粦鍧楁墍鍙楁媺鍔涳紝鎷夊姏鍐查噺鐨勫ぇ灏?/span>I=________锛屾粦鍧楀姩閲忔敼鍙橀噺鐨勫ぇ灏?/span>螖p=________锛涳紙鐢ㄩ涓粰鍑虹殑鐗╃悊閲忓強閲嶅姏鍔犻€熷害g琛ㄧず锛?/span> 锛?/span>6锛夋煇娆℃祴閲忓緱鍒扮殑涓€缁勬暟鎹负锛?/span>d=1.000 cm锛?/span>m1=1.50 锛?/span>7锛夊畾涔?/span> 24锛庯紙12鍒嗭級 鎴戝浗鑷富鐮斿埗浜嗚繍-20閲嶅瀷杩愯緭鏈恒€傞鏈鸿幏寰楃殑鍗囧姏澶у皬F鍙敤 锛?/span>1锛夋眰椋炴満瑁呰浇璐х墿鍚庣殑璧烽绂诲湴閫熷害锛?/span> 锛?/span>2锛夎嫢璇ラ鏈鸿杞借揣鐗╁悗锛屼粠闈欐寮€濮嬪寑鍔犻€熸粦琛?/span>1 521 m璧烽绂诲湴锛屾眰椋炴満鍦ㄦ粦琛岃繃绋嬩腑鍔犻€熷害鐨勫ぇ灏忓拰鎵€鐢ㄧ殑鏃堕棿銆?/span> 25锛庯紙20鍒嗭級 鍦ㄤ竴鏌卞舰鍖哄煙鍐呮湁鍖€寮虹數鍦猴紝鏌辩殑妯埅闈㈢Н鏄互O涓哄渾蹇冿紝鍗婂緞涓?/span>R鐨勫渾锛?/span>AB涓哄渾鐨勭洿寰勶紝濡傚浘鎵€绀恒€傝川閲忎负m锛岀數鑽烽噺涓?/span>q锛?/span>q>0锛夌殑甯︾數绮掑瓙鍦ㄧ焊闈㈠唴鑷?/span>A鐐?/span>鍏堝悗浠ヤ笉鍚岀殑閫熷害杩涘叆鐢靛満锛岄€熷害鏂瑰悜涓庣數鍦虹殑鏂瑰悜鍨傜洿銆傚凡鐭ュ垰杩涘叆鐢靛満鏃堕€熷害涓洪浂鐨勭矑瀛愶紝鑷渾鍛ㄤ笂鐨?/span>C鐐逛互閫熺巼v0绌垮嚭鐢靛満锛?/span>AC涓?/span>AB鐨勫す瑙?/span>胃=60掳銆傝繍鍔ㄤ腑绮掑瓙浠呭彈鐢靛満鍔涗綔鐢ㄣ€?/span> 锛?/span>1锛夋眰鐢靛満寮哄害鐨勫ぇ灏忥紱 锛?/span>2锛変负浣跨矑瀛愮┛杩囩數鍦哄悗鐨勫姩鑳藉閲忔渶澶э紝璇ョ矑瀛愯繘鍏ョ數鍦烘椂鐨勯€熷害搴斾负澶氬ぇ锛?/span> 锛?/span>3锛変负浣跨矑瀛愮┛杩囩數鍦哄墠鍚庡姩閲忓彉鍖栭噺鐨勫ぇ灏忎负mv0锛岃绮掑瓙杩涘叆鐢靛満鏃剁殑閫熷害搴斾负澶氬ぇ锛?/span>
锛堜簩锛夐€夎€冮锛氬叡45鍒嗐€傝鑰冪敓浠?/span>2閬撶墿鐞嗛銆?/span>2閬撳寲瀛﹂銆?/span>2閬撶敓鐗╅涓瘡绉戜换閫変竴棰樹綔绛斻€傚鏋滃鍋氾紝鍒欐瘡绉戞寜鎵€鍋氱殑绗竴棰樿鍒嗐€?/span> 33锛?/span>[鐗╃悊鈥斺€?/span>閫変慨3-3]锛?/span>15鍒嗭級 锛?/span>1锛夛紙5鍒嗭級鍒嗗瓙闂翠綔鐢ㄥ姏F涓庡垎瀛愰棿璺?/span>r鐨勫叧绯诲鍥炬墍绀猴紝r= r1鏃讹紝F=0銆傚垎瀛愰棿鍔胯兘鐢?/span>r鍐冲畾锛岃瀹氫袱鍒嗗瓙鐩歌窛鏃犵┓杩滄椂鍒嗗瓙闂寸殑鍔胯兘涓洪浂銆傝嫢涓€鍒嗗瓙鍥哄畾浜庡師鐐?/span>O锛屽彟涓€鍒嗗瓙浠庤窛O鐐瑰緢杩滃鍚?/span>O鐐硅繍鍔紝鍦ㄤ袱鍒嗗瓙闂磋窛鍑忓皬鍒?/span>r2鐨勮繃绋嬩腑锛屽娍鑳?/span>_____锛堝～鈥?/span>鍑忓皬鈥?/span>涓嶅彉鈥?/span>鎴?/span>鈥?/span>澧炲ぇ鈥?/span>锛夛紱鍦ㄩ棿璺濈敱r2鍑忓皬鍒?/span>r1鐨勮繃绋嬩腑锛屽娍鑳?/span>_____ 锛堝～鈥?/span>鍑忓皬鈥濃€?/span>涓嶅彉鈥?/span>鎴?/span>鈥?/span>澧炲ぇ鈥?/span>锛夛紱鍦ㄩ棿璺濈瓑浜?/span>r1澶勶紝鍔胯兘_____锛堝～鈥?/span>澶т簬鈥濃€?/span>绛変簬鈥濇垨鈥?/span>灏忎簬鈥?/span>锛夐浂銆?/span>
锛?/span>2锛夛紙10鍒嗭級鐢层€佷箼涓や釜鍌ㄦ皵缃愬偍瀛樻湁鍚岀姘斾綋锛堝彲瑙嗕负鐞嗘兂姘斾綋锛夈€傜敳缃愮殑瀹圭Н涓?/span>V锛岀綈涓皵浣撶殑鍘嬪己涓?/span>p锛涗箼缃愮殑瀹圭Н涓?/span>2V锛岀綈涓皵浣撶殑鍘嬪己涓?/span> 锛?/span>i锛変袱缃愪腑姘斾綋鐨勫帇寮猴紱 锛?/span>ii锛?/span>鐢茬綈涓皵浣撶殑璐ㄩ噺涓庣敳缃愪腑鍘熸湁姘斾綋鐨勮川閲忎箣姣斻€?/span> 34锛?/span>[鐗╃悊鈥斺€?/span>閫変慨3-4]锛?/span>15鍒嗭級 锛?/span>1锛夛紙5鍒嗭級鍦ㄤ笅鍒楃幇璞′腑锛屽彲浠ョ敤澶氭櫘鍕掓晥搴旇В閲婄殑鏈?/span>__________銆傦紙濉纭瓟妗堟爣鍙枫€?/span> 閫夊1涓緱2鍒嗭紝閫夊2涓緱4鍒嗭紝閫夊3涓緱5鍒嗭紱姣忛€夐敊1涓墸3鍒嗭紝鏈€浣庡緱鍒嗕负0鍒嗭級 A锛庨浄闆ㄥぉ鐪嬪埌闂數鍚庯紝绋嶈繃涓€浼氬効鎵嶈兘鍚埌闆峰０ B锛庤秴澹版尝琚绠′腑鐨勮娴佸弽灏勫悗锛屾帰娴嬪櫒鎺ユ敹鍒扮殑瓒呭０娉㈤鐜囧彂鐢熷彉鍖?/span> C锛庤瀵熻€呭惉鍒拌繙鍘荤殑鍒楄溅鍙戝嚭鐨勬苯绗涘０锛岄煶璋冧細鍙樹綆 D锛庡悓涓€澹版簮鍙戝嚭鐨勫０娉紝鍦ㄧ┖姘斿拰姘翠腑浼犳挱鐨勯€熷害涓嶅悓 E锛庡ぉ鏂囧涓婅瀵熷埌鍙屾槦锛堢浉璺濊緝杩戙€佸潎缁曞畠浠繛绾夸笂鏌愮偣鍋氬渾鍛ㄨ繍鍔ㄧ殑涓ら鎭掓槦锛夊厜璋遍殢鏃堕棿鐨勫懆鏈熸€у彉鍖?/span> 锛?/span>2锛夛紙10鍒嗭級涓€鎸姩鐗囦互棰戠巼f鍋氱畝璋愭尟鍔ㄦ椂锛屽浐瀹氬湪鎸姩鐗囦笂鐨勪袱鏍圭粏鏉嗗悓姝ュ懆鏈熸€у湴瑙﹀姩姘撮潰涓?/span>a銆?/span>b涓ょ偣锛屼袱娉㈡簮鍙戝嚭鐨勬尝鍦ㄦ按闈笂褰㈡垚绋冲畾鐨勫共娑夊浘鏍枫€?/span>c鏄按闈笂鐨勪竴鐐癸紝a銆?/span>b銆?/span>c闂寸殑璺濈鍧囦负l锛屽鍥炬墍绀恒€傚凡鐭ラ櫎c鐐瑰锛屽湪ac杩炵嚎涓婅繕鏈夊叾浠栨尟骞呮瀬澶х殑鐐癸紝鍏朵腑璺?/span>c鏈€杩戠殑鐐瑰埌c鐨勮窛绂讳负
锛?/span>i锛夋尝鐨勬尝闀匡細 锛?/span>ii锛?/span>娉㈢殑浼犳挱閫熷害銆?/span>
2020骞存櫘閫氶珮绛夊鏍℃嫑鐢熷叏鍥界粺涓€鑰冭瘯 鐞嗙缁煎悎鍙傝€冪瓟妗?/span>
14锛?/span>D聽 15锛?/span>B聽 16锛?/span>B聽 17锛?/span>A聽 18锛?/span>C聽 19锛?/span>BD聽 20锛?/span>AB聽 21锛?/span>BC 22锛庯紙1锛?/span>O銆?/span>P聽聽 锛?/span>2锛?/span>I聽 50.5聽 锛?/span>3锛?/span>50.0 23锛庯紙1锛夊ぇ绾︾浉绛?/span>聽 锛?/span>5锛?/span>m1gt12聽 锛?/span>5锛?/span> 24锛?/span>瑙ｏ細锛?/span>1锛夎椋炴満瑁呰浇璐х墿鍓嶈川閲忎负m1锛岃捣椋炵鍦伴€熷害涓?/span>v1锛涜杞借揣鐗╁悗璐ㄩ噺涓?/span>m2锛岃捣椋炵鍦伴€熷害涓?/span>v2锛岄噸鍔涘姞閫熷害澶у皬涓?/span>g銆傞鏈鸿捣椋炵鍦板簲婊¤冻鏉′欢
鐢?/span>鈶犫憽寮忓強棰樼粰鏉′欢寰?/span> 锛?/span>2锛夎椋炴満婊戣璺濈涓?/span>s锛屾粦琛岃繃绋嬩腑鍔犻€熷害澶у皬涓?/span>a锛屾墍鐢ㄦ椂闂翠负t銆傜敱鍖€鍙橀€熺洿绾胯繍鍔ㄥ叕寮忔湁
v2=at鈶?/span> 鑱旂珛鈶⑩懀鈶?/span>寮忓強棰樼粰鏉′欢寰?/span> a=2.0 m/s2鈶?/span> t=39 s鈶?/span> 25锛?/span>瑙ｏ細锛?/span>1锛夌矑瀛愬垵閫熷害涓洪浂锛岀敱C鐐瑰皠鍑虹數鍦猴紝鏁呯數鍦烘柟鍚戜笌AC骞宠锛岀敱A鎸囧悜C銆傜敱鍑犱綍鍏崇郴鍜岀數鍦哄己搴︾殑瀹氫箟鐭?/span> AC=R鈶?/span> F=qE鈶?/span> 鐢卞姩鑳藉畾鐞嗘湁F路AC= 鑱旂珛鈶犫憽鈶㈠紡寰?/span>
锛?/span>2锛夊鍥撅紝鐢卞嚑浣曞叧绯荤煡AC鈯?/span>BC锛屾晠鐢靛満涓殑绛夊娍绾夸笌BC骞宠銆備綔涓?/span>BC骞宠鐨勭洿绾夸笌鍦嗙浉鍒囦簬D鐐癸紝涓?/span>AC鐨勫欢闀跨嚎浜や簬P鐐癸紝鍒欒嚜D鐐逛粠鍦嗗懆涓婄┛鍑虹殑绮掑瓙鐨勫姩鑳藉閲忔渶澶с€傜敱鍑犱綍鍏崇郴鐭?/span>
鈭?i>PAD=30掳锛?/span>AP= 璁剧矑瀛愪互閫熷害v1杩涘叆鐢靛満鏃跺姩鑳藉閲忔渶澶э紝鍦ㄧ數鍦轰腑杩愬姩鐨勬椂闂翠负t1銆傜矑瀛愬湪AC鏂瑰悜鍋氬姞閫熷害涓?/span>a鐨勫寑鍔犻€熻繍鍔紝杩愬姩鐨勮窛绂荤瓑浜?/span>AP锛涘湪鍨傜洿浜?/span>AC鐨勬柟鍚戜笂鍋氬寑閫熻繍鍔紝杩愬姩鐨勮窛绂荤瓑浜?/span>DP銆傜敱鐗涢】绗簩瀹氬緥鍜岃繍鍔ㄥ鍏紡鏈?/span> F=ma鈶?/span>
DP=v1t1鈶?/span> 鑱旂珛鈶♀懀鈶も懃鈶︹懅寮忓緱 锛?/span>3锛夎绮掑瓙浠ラ€熷害v杩涘叆鐢靛満鏃讹紝鍦ㄧ數鍦轰腑杩愬姩鐨勬椂闂翠负t銆備互A涓哄師鐐癸紝绮掑瓙杩涘叆鐢靛満鐨勬柟鍚戜负x杞存鏂瑰悜锛岀數鍦烘柟鍚戜负y杞存鏂瑰悜寤虹珛鐩磋鍧愭爣绯汇€傜敱杩愬姩瀛﹀叕寮忔湁
x=v t聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 11 绮掑瓙绂诲紑鐢靛満鐨勪綅缃湪鍦嗗懆涓婏紝鏈?/span>
绮掑瓙鍦ㄧ數鍦轰腑杩愬姩鏃讹紝鍏?/span>x鏂瑰悜鐨勫姩閲忎笉鍙橈紝y鏂瑰悜鐨勫垵濮嬪姩閲忎负闆躲€傝绌胯繃鐢靛満 鍓嶅悗鍔ㄩ噺鍙樺寲閲忕殑澶у皬涓?/span>mv0鐨勭矑瀛愶紝绂诲紑鐢靛満鏃跺叾y鏂瑰悜鐨勯€熷害鍒嗛噺涓?/span>v2锛岀敱棰樼粰鏉?/span> 浠跺強杩愬姩瀛﹀叕寮忔湁 mv2=mv0=mat聽聽聽聽聽聽聽聽聽聽聽 13 鑱旂珛鈶♀懀鈶モ懇111213寮忓緱 v=0聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 14 鍜?/span> 鍙﹁В锛?/span> 鐢遍鎰忕煡锛屽垵閫熶负0鏃讹紝鍔ㄩ噺澧為噺鐨勫ぇ灏忎负mv0锛屾鍗抽棶棰樼殑涓€涓В銆傝嚜A鐐逛互涓嶅悓鐨勯€熺巼鍨傜洿浜庣數鍦烘柟鍚戝皠鍏ョ數鍦虹殑绮掑瓙锛屾部y鏂瑰悜浣嶇Щ鐩哥瓑鏃讹紝鎵€鐢ㄦ椂闂撮兘鐩稿悓銆傚洜姝わ紝涓嶅悓绮掑瓙杩愬姩鍒扮嚎娈?/span>CB涓婃椂锛屽姩閲忓彉鍖栭兘鐩稿悓锛岃嚜B鐐瑰皠鍑虹數鍦虹殑绮掑瓙锛屽叾鍔ㄩ噺鍙樺寲涔熶负mv0锛岀敱鍑犱綍鍏崇郴鍙婅繍鍔ㄥ瑙勫緥鍙緱锛屾鏃跺叆灏勯€熺巼 33锛庯紙1锛夊噺灏?/span>聽 鍑忓皬聽 灏忎簬 锛?/span>2锛夎В锛氾紙i锛夊亣璁句箼缃愪腑鐨勬皵浣撹鍘嬬缉鍒板帇寮轰负p锛屽叾浣撶Н鍙樹负V1锛岀敱鐜绘剰鑰冲畾寰嬫湁
鐜颁袱缃愭皵浣撳帇寮哄潎涓?/span>p锛屾€讳綋绉负(V+V1)銆傝璋冮厤鍚庝袱缃愪腑姘斾綋鐨勫帇寮轰负p鈥?/span>锛岀敱鐜绘剰鑰冲畾寰嬫湁 p锛?/span>V+V1锛?/span>=p鈥?/span>锛?/span>V+2V锛?/span>鈶?/span> 鑱旂珛鈶犫憽寮忓彲寰?/span>
锛?/span>鈪?/span>锛夎嫢璋冮厤鍚庣敳缃愪腑鐨勬皵浣撳啀琚帇缂╁埌鍘熸潵鐨勫帇寮?/span>p鏃讹紝浣撶Н涓?/span>V2锛岀敱鐜绘剰鑰冲畾寰?/span> p鈥?i>V=pV2鈶?/span> 璁捐皟閰嶅悗鐢茬綈涓皵浣撶殑璐ㄩ噺涓庣敳缃愪腑鍘熸湁姘斾綋鐨勮川閲忎箣姣斾负k锛岀敱瀵嗗害鐨勫畾涔夋湁
鑱旂珛鈶⑩懀鈶?/span>寮忓彲寰?/span>
34锛庯紙1锛?/span>BCE 锛?/span>2锛夎В锛氾紙i锛夊鍥撅紝璁捐窛c鐐规渶杩戠殑鎸箙鏋佸ぇ鐨勭偣涓?/span>d鐐癸紝a涓?/span>d鐨勮窛绂讳负r1锛?/span>b涓?/span>d鐨勮窛绂讳负r2锛?/span>d涓?/span>c鐨勮窛绂讳负s锛屾尝闀夸负位銆傚垯
r2鈥?i>r1=位鈶?/span> 鐢卞嚑浣曞叧绯绘湁 r1=l鈥?i>s鈶?/span>
鑱旂珛鈶犫憽鈶?/span>寮忓苟浠ｅ叆棰樼粰鏁版嵁寰?/span>
锛?/span>鈪?/span>锛夋尝鐨勯鐜囦负f锛岃娉㈢殑浼犳挱閫熷害涓?/span>v锛屾湁 v=f位鈶?/span> 鑱旂珛鈶ｂ懁寮忓緱
|
