澶у搴旂敤鐗╃悊绛旀
銆愮瘒涓�锛氬ぇ瀛﹀簲鐢ㄧ墿鐞嗙浜旂珷涔犻绛旀銆?/p>
10j
鐨勫垰鎬у弻鍘熷瓙鍒嗗瓙鐞嗘兂姘斾綋銆傛眰
:
锛?/p>
1
锛夋皵浣撶殑鍘嬪己锛涳紙
2
锛夎嫢瀹?/p>
鍣ㄤ腑鍒嗗瓙鎬绘暟涓?/p>
5.4?10
涓紝鍒欏垎瀛愮殑骞冲潎骞冲姩鍔ㄨ兘鍙婃皵浣撶殑娓╁害涓?/p>
澶氬皯锛?/p>
瑙ｏ細锛?/p>
1
锛夊鍒氭�у弻鍘熷瓙鍒嗗瓙鑰岃█锛?/p>
i=5,
鐢?/p>
e?
22
?332
mim
rt
鍜?/p>
pv?rt
鍙緱姘斾綋鍘嬪己
?2?
p?2e/iv?1.35?105pa
锛?/p>
2
锛夊垎瀛愭暟瀵嗗害
n?n/v
锛屽垯璇ユ皵浣撶殑娓╁害
t?p/nk?pv/(nk)?3.62?102k
姘斾綋鍒嗗瓙鐨勫钩鍧囧姩鍔ㄨ兘涓猴細
k?3kt/2?7.49?10
?21
j
5-7
鑷杞﹁疆鐩村緞涓?/p>
71.12cm
锛屽唴鑳庢埅闈㈢洿寰勪负
3cm
銆傚湪
?3c
鐨勭┖
姘旈噷鍚戠┖鑳庨噷鎵撴皵銆傛墦姘旂瓛闀?/p>
30cm
锛屾埅闈㈠崐寰勪负
1.5cm
銆傛墦浜?/p>
20
涓嬶紝姘旀墦瓒充簡锛岄棶姝ゆ椂鑳庡唴鍘嬪己鏄灏戯紵璁捐溅鑳庡唴鏈�鍚庢皵浣撴俯搴︿负
7c
銆?/p>
瑙ｏ細
璁惧悜鑷杞﹀唴鑳庢墍鎵撶殑绌烘皵鐨勬懇灏旀暟涓?/p>
?
鐢?/p>
pv??rt
寰?/p>
??
p1v1
rt1
鍏朵腑锛?/p>
p1?1atm
锛?/p>
v1?20?30?10?2???(1.5?10?2)2m3
锛?/p>
t1??3?273?270k
姘旀墦瓒冲悗锛岃儙鍐呯┖姘旂殑浣撶Н
v2???71.12?10???(?10)m
娓╁害
t2?7?273?280k
锛屽帇寮轰负
p2
锛岀敱
pv??rt
寰?/p>
p2?
?2
32
?223
?rt2
v2
p1v1
?rt2
12t1pvt1.013?105?20?30?10?2???(1.5?10?2)?280112
?p2???