皮皮学，免费搜题
登录
搜题
【简答题】
如右图,质量分别为 m 和 M 的两个星球 A 和 B 在引力作用下都绕 O 点做匀速运动,星球 A 和 B 两者中心之间距离为 L 。已知 A 、 B 的中心和 O 三点始终共线, A 和 B 分别在 O 的两侧。引力常数为 G 。 求两星球做圆运动的期。 在地月系统中,若忽略其它星球的影响,可以将月球和地球看成上述星球 A 和 B ,月球绕其轨道中心运行为的期记为 T 1 。但在近似处理问题时,常常认为月球是绕地心做圆运动的,这样算得的运行期 T 2 。已知地球和月球的质量分别为 5.98×10 24 kg 和 7.35 ×10 22 kg 。求 T 2 与 T 1 两者平方之比。(结果保留 3 位小数)
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】20114 Q1:( ) A. Chief engineer. B. Second engineer. C. Third engineer. D. Fourth engineer. Q2:( ) A. Charging air pressure of main engine is too high. B. Charging air temperature o...
【单选题】Who is in charge of the auxiliary engine ?
A.
The chief engineer
B.
The second engineer
C.
hird engineer
D.
The fourth engineer
【单选题】On regular inspections of alternator windings it is found that windings are always covered with a heavy oil film coming from the atmosphere surrounding the auxiliary engine. After cleaning with an app...
A.
Improve material of intake air filters.
B.
Take no additional action.
C.
Blank off intake air filters.
D.
. Re-insulate the windings after each cleaning.
【单选题】题干: 互见中,两艘机动船航向交叉,相互驶近,在形成碰撞危险前,有他船位于本船左舷的船舶:
A.
可以采取任何行动
B.
应避免向左转向
C.
应保速保向
D.
应采取最有助于避碰的行动
【简答题】数据库按存放地点可分为________数据库和________数据库。
【简答题】Have you ever served the auxiliary engine to combustion heavy oil? What should be borne in mind when transferring oil; from heavy oil to light oil?
【单选题】The auxiliary engine and a.cgenerator can be connected with _____.
A.
cam
B.
crosshead
C.
bulge
D.
coupling
【单选题】Q: What type is the auxiliary engine?
A.
A two-stroke low speed diesel engine.
B.
A four-stroke medium speed diesel engine.
C.
A two-stroke medium speed diesel engine.
D.
A four-stroke low speed diesel engine.
相关题目：