一艘宇宙飛船飛近某一新發(fā)現(xiàn)的行星,并進(jìn)入靠近該行星表面的圓形軌道繞行數(shù)圈后,著陸在行星上,宇宙飛船上備有以下實(shí)驗(yàn)儀器:                                                                                                                  

A.彈簧測(cè)力計(jì)一個(gè)                                                                                                         

B.精確秒表一只                                                                                                            

C.天平一臺(tái)(附砝碼一套)                                                                                           

D.物體一個(gè)                                                                                                                   

為測(cè)定該行星的質(zhì)量M和半徑R,宇航員在繞行及著陸后各進(jìn)行一次測(cè)量,依據(jù)測(cè)量數(shù)據(jù)可以求出M和R(已知引力常量為G).                                                                                                                           

(1)繞行時(shí)測(cè)量所用的儀器為                                                              (用儀器的字母序號(hào)表示),所測(cè)物理量為        .                                                                                                             

(2)著陸后測(cè)量所用的儀器為                                                    ,所測(cè)物理量為               .用測(cè)量數(shù)據(jù)求該星球半徑R=                                                                                                  

                                                                                                                                       


B;周期T;ACD;物體質(zhì)量m、重力F;


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