# Yahoo奇摩 網頁搜尋

1. ### 黑洞是冷的還是熱的？

... of a degree above absolute zero (i.e. 10^-5 K). A black hole about the mass of the Moon has a temperature of 2.7 K Since black holes ...

2. ### 3 gravitation mc

1 Although the gravity on the moon is weaker than that on earth, the object is being ppushed...

3. ### Physics: force and motion

...acceleration due to gravity) hence, s = u^2/2g A lower value of g on the moon indicates a larger value for s (height reached) than on earth...

4. ### Physics Q (Dynamics)

Weight is a force. No matter on which planet, weight is calculated by GMm/r^2 The max weight a person can lift depends on the person's physical ability only. So he can lift objects as heavy as on earth.

5. ### 2條Astronomy mc

...proportional constant. For the satellite: 90^2 = kR^3 ---------- (1) For the moon : T^2 = k(Rm)^3 ------------- (2) where T is the period of...

6. ### AL physics mc

...'s 3rd Law, let d be the distance between th earth centre and moon centre hence, (28/1)^2 = (d/6.6R)^3 where 28 days is...

7. ### mechanics 2 (urgent)

1. The astronaut feels weightlessness is because he has no relative motion with the orbiting satellite. It is because both the astronaut and satellite are in the same orbit revolving round the earth. 2. A parking orbit must be a circular orbit over...

8. ### gravitation (urgent)

... the pole, the object is NOT performing any circular motion about the earth's centre and hence NO centripetal force is ...

9. ### Wave Motion I :Reflection of L

1. The answer is option A.The moon only reflects light from the sun. 2. Since incident angle = reflection angle...

10. ### S.2 IS Space Travel !!easy

The mass of the moon is about 1/80 of that of the earth. Since gravitational force is...earth is apparently stronger than the force due to the moon . As such, the point of "zero gravity", where the gravitational...