Solution: (1) Let the ship speed be km/h, then km.
In δ, ∠ is equal to the depression angle of 30, ∴.
Similarly, Delta. ? (4 points)
In delta ≈ 15+45 = 60,
∴ From cosine theorem,
∴ km/h, the speed of the ship is km/h (6 minutes).
(2) (Method 1) Do it at the point. When the ship reaches the point, it is the smallest, so it is the smallest.
At this point. (10)
∴ = .
The shortest distance between the ship and the observation station is 100 km. (12 minutes)
(Method 2) From (1) to △, from sine theorem,
. (8 points)
When the ship arrives, it is the smallest, so it is the smallest.
At this point. (10)
I've praised it all. I've stepped on it. What is your evaluation of this answer? Put away comments//high quality or satisfaction or special types or recommended answers dottimewindow.iperformance & window.iperformance.mark ('c _ best',+newdate); Lawyer recommendation service: If your problem has not been solved, please describe your problem in detail and provide free professional consultation through Baidu Law Professional Edition. Other similar problems 2011-03-18. Island A has a mountain with an altitude of 1km, and there is an observation station P at the top. There is a ship sailing in a straight line at a constant speed in a fixed direction,11in the morning; 00: 00,282011-03-11,there is a mountain at an altitude of 1000 meters on Island A, and there is an observation station P at the top. At 1 1: 00 in the morning, a ship was measured at 30 degrees east of the island, with a depression angle of 307220655. Observe a boat B on the sea, measure its depression angle as 30o, and find the water between the boat and the observer 8220 14-06-02. Island A has a mountain with an altitude of 1 km, and there is an observation station P at the top. At 1 1 in the morning, the altitude of a ship was measured at O Island in the north of the island142014-1-22. At 1 1 in the morning, a ship was detected at 60°C east of the north of the island, with a dip angle of 30520 10-07-06. As shown in the picture, there is a mountain at an altitude of 2000 meters on O Island, and an observation station A is arranged at the top of the mountain. At 1 1 in the morning, a ship was measured at C ... 32016-12-01,that is, 60 to the east of the island. As the picture shows, a ship sails in a straight line at a constant speed near an island. At 1 1 in the morning, an observation post A on the island measured that the ship was at B102013-04-15, 60 east of the north of the island, at point A on the rock at the height of 100 meters. 3 More similar questions? & gt recommended for you: F.context('cmsRight', [{'URL':'/d01373f082025aaf511aa256e9edab64034f1a07? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '， ' contractId':'A24KA00562 '，}，{ ' URL ':/builder/bjh-activity/articlesTask？ taskId = 1598082 & aside = 0 & footer = true & from = 0 '，' src ':'/203 FB 80 e 7 bec 54 e 773 ea 0680 ab 389 b 504 fc 26 a2d？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId ':' '，}，{ ' URL ':/s？ word = % E6 % AC % A7 % E6 % B4 % B2 % E6 % 9D % AF & sa = searchpromo _ ozb _ zhidao _ tuijian '，' src ':'/3 BF 33 a 87 e 950352 AAF 5 df 4954 143 fbf2b 2 1 18 b6b？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId ':' '，}])； Why is the cost of cancer treatment getting higher and higher? What impact will the "network toilet" have? The price of electric cars has dropped many times. Is the quality guaranteed? Is Huaqiang North's second-hand mobile phone reliable? I recommend f.context ('recbrand', [{"img": "\/86D6277F9E2F07083523F69DFB 24B 899A901F20d? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto "，" url":"/hm.js？ 6859 ce 5a af 00 FB 00387 e 6434 E4 FCC 925 "； var s = document . getelementsbytagname(" script ")[0]； s.parentNode.insertBefore(hm，s)； })(); window . TT = 172077347 1；