题目

一艘宇宙飞船飞近某一新发现的行星，并进入靠近该行星表面的圆形轨道绕行数圈后，着陆在行星上，宇宙飞船上备有以下实验仪器：                                                                                                                   A．弹簧测力计一个                                                                                                          B．精确秒表一只                                                                                                             C．天平一台（附砝码一套）                                                                                            D．物体一个                                                                                                                    为测定该行星的质量M和半径R，宇航员在绕行及着陆后各进行一次测量，依据测量数据可以求出M和R（已知引力常量为G）．                                                                                                                            （1）绕行时测量所用的仪器为                                                              （用仪器的字母序号表示），所测物理量为        ．                                                                                                              （2）着陆后测量所用的仪器为                                                    ，所测物理量为               ．用测量数据求该星球半径R=                                                                                                   ．                                                                                                                                         答案：B；周期T；ACD；物体质量m、重力F；

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