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【题目】2014年12月31日上午9时02分(北京时间),长征三号甲型运载火箭在西昌卫星发射中心成功将风云二号08星送入预定轨道。风云二号08星在升空后被重命名为风云二号G星,定点于99.5°E赤道上空的地球同步轨道上,将在天气预报、气候预测、军事、航天气象保障等领域发挥重要作用。据此回答下列各题。

1风云二号08星成功入轨时,美国东部(西五区)时间是2014年12月( )

A. 31日1时02分 B. 30日20时02分

C. 31日22时02分 D. 30日19时02分

2风云二号G星的运转速度与地面对应点的自转速度相比( )

A. 角速度小,线速度大 B. 角速度相同,线速度大

C. 角速度大,线速度小 D. 角速度大,线速度相同

【答案】

1B

2B

【解析】试题分析:

1】北京时间采用的是东八区区时,比东五区区时早13个小时。故卫星入轨成功时,东五区区时为31902—13=302002B正确。

2】因发射的是地球同步卫星,因此卫星绕地公转的角速度与地球自转的角速度相同,线速度高于地面上对应的点。B正确。

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