绗?/p>
1
椤?/p>
鍏?/p>
59
椤?/p>
1
锛?/p>
20
鍒嗭級
濡傚浘
12
鎵�绀猴紝
PR
鏄竴鍧楅暱涓?/p>
L
=4
m
鐨勭粷缂樺钩鏉垮浐瀹氬湪姘村钩鍦伴潰涓婏紝鏁翠釜绌洪棿鏈変竴涓?/p>
骞宠浜?/p>
PR
鐨勫寑寮虹數鍦?/p>
E
锛屽湪鏉跨殑鍙冲崐閮ㄥ垎鏈変竴涓瀭鐩翠簬绾搁潰鍚戝鐨勫寑寮虹鍦?/p>
B
锛屼竴涓川閲?/p>
涓?/p>
m
=0
锛?/p>
1 kg
锛屽甫鐢甸噺涓?/p>
q
=0
锛?/p>
5 C
鐨勭墿浣擄紝浠庢澘鐨?/p>
P
绔敱闈欐寮�濮嬪湪鐢靛満鍔涘拰鎽╂摝鍔涚殑浣?/p>
鐢ㄤ笅鍚戝彸鍋氬寑鍔犻�熻繍鍔紝杩涘叆纾佸満鍚庢伆鑳藉仛鍖�閫熻繍鍔ㄣ�傚綋鐗╀綋纰板埌鏉?/p>
R
绔殑鎸℃澘鍚庤寮瑰洖锛?/p>
鑻ュ湪纰版挒鐬棿鎾ゅ幓鐢靛満锛?/p>
鐗╀綋杩斿洖鏃跺湪纾佸満涓粛鍋氬寑閫熻繍鍔紝
绂诲紑纾佸満鍚庡仛鍖�鍑忛�熻繍鍔ㄥ仠鍦?/p>
C
鐐癸紝
PC
=L/4
锛岀墿浣撲笌骞虫澘闂寸殑鍔ㄦ懇鎿﹀洜鏁颁负
渭=0
锛?/p>
4
锛屽彇
g=10m/s
2
锛屾眰锛?/p>
锛?/p>
1
锛夊垽鏂墿浣撳甫鐢垫�ц川锛屾鐢佃嵎杩樻槸璐熺數鑽凤紵
锛?/p>
2
锛夌墿浣撲笌鎸℃澘纰版挒鍓嶅悗鐨勯�熷害
v
1
鍜?/p>
v
2
锛?/p>
3
锛夌鎰熷簲寮哄害
B
鐨勫ぇ灏?/p>
锛?/p>
4
锛夌數鍦哄己搴?/p>
E
鐨勫ぇ灏忓拰鏂瑰悜
2(10
鍒?/p>
)
濡傚浘
2
鈥?/p>
14
鎵�绀猴紝鍏夋粦姘村钩妗岄潰涓婃湁闀?/p>
L=2m
鐨勬湪鏉?/p>
C
锛岃川閲?/p>
m
c
=5kg
锛屽湪鍏舵涓ぎ
骞舵帓鏀剧潃涓や釜灏忔粦鍧?/p>
A
鍜?/p>
B
锛?/p>
m
A
=1kg
锛?/p>
m
B
=4kg
锛屽紑濮嬫椂涓夌墿閮介潤姝紟鍦?/p>
A
銆?/p>
B
闂存湁灏戦噺濉?/p>
鑳剁偢鑽紝
鐖嗙偢鍚?/p>
A
浠ラ�熷害
6m
锛?/p>
s
姘村钩鍚戝乏杩愬姩锛?/p>
A
銆?/p>
B
涓换涓�鍧椾笌鎸℃澘纰版挒鍚庯紝
閮界矘鍦ㄤ竴璧凤紝
涓嶈鎽╂摝鍜岀鎾炴椂闂达紝姹傦細
(1)
褰撲袱婊戝潡
A
銆?/p>
B
閮戒笌鎸℃澘纰版挒鍚庯紝
C
鐨勯�熷害鏄澶?/p>
?
(2)
鍒?/p>
A
銆?/p>
B
閮戒笌鎸℃澘纰版挒涓烘锛?/p>
C
鐨勪綅绉讳负澶氬皯
?
3
锛?/p>
10
鍒嗭級涓轰簡娴嬮噺灏忔湪鏉垮拰鏂滈潰闂寸殑鎽╂摝鍥犳暟锛屾煇鍚屽璁捐濡傚浘鎵�绀哄疄楠岋紝鍦ㄥ皬鏈ㄦ澘涓婂浐
瀹氫竴涓交寮圭哀锛屽脊绨т笅绔悐涓�涓厜婊戝皬鐞冿紝寮圭哀闀垮害鏂瑰悜涓庢枩闈㈠钩琛岋紝鐜板皢鏈ㄦ澘杩炲悓寮圭哀銆?/p>
灏忕悆鏀惧湪鏂滈潰涓婏紝鐢ㄦ墜鍥哄畾鏈ㄦ澘鏃讹紝寮圭哀绀烘暟涓?/p>
F
1
锛屾斁鎵嬪悗锛屾湪鏉挎部鏂滈潰涓嬫粦锛岀ǔ瀹氬悗寮?/p>
绨хず鏁颁负
F
2
锛屾祴寰楁枩闈㈡枩瑙掍负胃锛屽垯鏈ㄦ澘涓庢枩闈㈤棿鍔ㄦ懇鎿﹀洜鏁颁负澶氬皯锛燂紙鏂滈潰浣撳浐瀹氬湪鍦?/p>
闈笂锛?/p>
鍥?/p>
12