问题 计算题

2011年7月11日23时41分,我国在西昌卫星发射中心用长征三号丙运载火箭,成功将“天链一号02星”送入太空。“天链一号02星”是我国第二颗地球同步轨道数据中继卫星,它将与2008年发射的“天链一号01星”组网运行,为我国神舟飞船以及未来空间实验室、空间站建设提供数据中继和测控服务,并将应用于我国将于2011年下半年实施的首次空间交会对接任务。若用m表示“天链一号02星”的质量,h 表示它离地面的高度,R0表示地球的半径,go表示地球表面处的重力加速度,T表示地球自转周期,万有引力常量为G。求:

(1)“天链一号02星”受到地球对它的万有引力的大小(用含有m、go、R0、h的字母表示);

(2)地球赤道表面的物体随地球自转的线速度与“天链一号02星”环绕速度的比值;

(3)利用上述数据计算出地球的质量M(用含有G、T、R0、h的字母表示)?

答案

(1)(2)(3)

天链一号02星”定点在赤道上空,其绕地球转动的角速度与地球自转角速度相同,其向心力由地球引力提供.

(1)“天链一号02星”所受万有引力的大小为

地球表面物体的重力可以近似认为等于万有引力,即

,可解得

(2)地球赤道表面的物体随地球自转的线速度,“天链一号02星”环绕速度,则二者线速度之比为

(3)根据万有引力提供向心力得: 

可解得

填空题



The Commission is expected to propose allowing people to choose which (36) they would come under, based on their (37) or their residency. But the proposal is set to (38) because of the very different laws on divorce that apply across the EU. The Commission wants to (39) problems over which law to apply when, for example, a married couple from one member state is resident in another member state or when the couple is of different ELI nationalities.
The (40) of member states are said to be (41) the idea and responded positively to a (42) which followed the (43) of a Commission Green Paper. With 15% of German divorces each year involving couples of different nationalities, the government of Berlin (44) see resolved the issue of which laws should apply.
But some member states are expected to resist the (45) which would involve allowing different divorce laws to be applied in their countries. For example, Malta does not allow divorce. The proposal would mean that although Maltese nationals could not divorce in Malta, a couple of different EU nationality (46) in Malta could apply to the Maltese court for a divorce under their country’s laws. Similarly in Ireland where the divorce law states a couple must have been separated for four years, establish that their marriage has broken down and be offered (47) a couple from Sweden could apply to an Irish court to allow them to divorce under Swedish law, where divorce can be (48) quickly. The Irish government’s submission to the Commission on the Green Paper stated: "reland is not in favor of allowing (49) to choose the applicable law, as this could be open to abuse ... such abuse would be likely to (50) most on divorce regimes, such as that of Ireland, which require a relatively long separation period."
Ireland, like the UK, however, is allowed to choose whether to "opt-in" to such a proposal under rules agreed in the Amsterdam treaty. Malta has no such (51) but could (52) the proposal in the Council of Ministers since (53) approval will be required. "It is going to lead to (54) said Geoffrey Shannon, Irish expert on the Commission on European Family Law, which examines the (55) of EU family law. The proposal would also mean that judges would have to be trained in the divorce law of all 25 member states.
The Commission is expected to propose allowing people to choose which (36) they would come under, based on their (37) or their residency. But the proposal is set to (38) because of the very different laws on divorce that apply across the EU. The Commission wants to (39) problems over which law to apply when, for example, a married couple from one member state is resident in another member state or when the couple is of different ELI nationalities.
The (40) of member states are said to be (41) the idea and responded positively to a (42) which followed the (43) of a Commission Green Paper. With 15% of German divorces each year involving couples of different nationalities, the government of Berlin (44) see resolved the issue of which laws should apply.
But some member states are expected to resist the (45) which would involve allowing different divorce laws to be applied in their countries. For example, Malta does not allow divorce. The proposal would mean that although Maltese nationals could not divorce in Malta, a couple of different EU nationality (46) in Malta could apply to the Maltese court for a divorce under their country’s laws. Similarly in Ireland where the divorce law states a couple must have been separated for four years, establish that their marriage has broken down and be offered (47) a couple from Sweden could apply to an Irish court to allow them to divorce under Swedish law, where divorce can be (48) quickly. The Irish government’s submission to the Commission on the Green Paper stated: "reland is not in favor of allowing (49) to choose the applicable law, as this could be open to abuse ... such abuse would be likely to (50) most on divorce regimes, such as that of Ireland, which require a relatively long separation period."
Ireland, like the UK, however, is allowed to choose whether to "opt-in" to such a proposal under rules agreed in the Amsterdam treaty. Malta has no such (51) but could (52) the proposal in the Council of Ministers since (53) approval will be required. "It is going to lead to (54) said Geoffrey Shannon, Irish expert on the Commission on European Family Law, which examines the (55) of EU family law. The proposal would also mean that judges would have to be trained in the divorce law of all 25 member states.

单项选择题 A1/A2型题