1
2014
骞粹�滃崕绾︹�濊嚜涓绘嫑鐢熺墿鐞嗚瘯棰?/p>
1
锛庡鍥炬墍绀虹殑浼犻�佸甫瑁呯疆锛屼笌姘村钩闈㈢殑澶硅涓?/p>
饾渻
锛屼笖
tan
饾渻
=0.75
銆備紶閫佸甫鐨勯�熷害涓?/p>
v
=4m/s
锛屾懇
鎿︾郴鏁颁负
渭
=0.8
锛屽皢涓�涓川閲?/p>
m
=4kg
鐨勫皬鐗╁潡杞昏交鐨勬斁缃湪瑁呯疆鐨勫簳閮紝宸茬煡浼犻�佸甫瑁呯疆鐨勫簳
閮ㄥ埌椤堕儴涔嬮棿鐨勮窛绂?/p>
L
=20m
銆傦紙鏈閲嶅姏鍔犻�熷害
g
=10m/s
2
锛?/p>
锛?/p>
1
锛夋眰鐗╁潡浠庝紶閫佸甫搴曢儴杩愬姩鍒伴《閮ㄧ殑鏃堕棿
t
锛?/p>
锛?/p>
2
锛夋眰姝よ繃绋嬩腑浼犻�佸甫瀵圭墿鍧楁墍鍋氱殑鍔熴�?/p>
锛堟敞锛氳嫢鏄眰浼犻�佸甫鍋氬姛锛屽垯闇�鑰冭檻鍐呰兘鐨勫彉鍖栵紝姝ゆ椂
饾憡
1
=
饾憮
1
饾懀
1
饾憽
1
= 160J
锛?/p>
饾憡
2
涓嶅彉锛屾�诲姛涓?/p>
饾憡
=
饾憡
1
+
饾憡
2
= 592J
锛?/p>
娉曚簩锛氱敤鍔熻兘鍘熺悊锛屼紶閫佸甫瀵圭墿鍧楁墍鍋氱殑鍔熶负鐗╁潡鑾峰緱鐨勬満姊拌兘锛堝姩鑳戒笌閲嶅姏鍔胯兘锛夊垯锛?/p>