# Yahoo奇摩 網頁搜尋

1. ### Central force question?

...it is GREATER than the required centripetal force to keep it in orbit . That is, G(m1)(m2)/(r2)^2 > (m2)(Vb)^2/r2 where...

分類：科學及數學 > 物理學 2018年04月13日

2. ### Question about water waves?

...do move. Water molecules in a "surface wave" move in circular orbits . The diameter of the orbit decreases with distance below the water surface...

分類：科學及數學 > 物理學 2018年02月04日

3. ### Confusions about electrons as a wave. (A bit long and stupid. Thanks you so much for taking time to see)?

... because the electron is in a fixed orbit . A progressive wave would imply that the electron is.... Based on such understanding, the " orbit " is thus NOT a simple circle. It...

分類：科學及數學 > 物理學 2017年02月07日

4. ### Gravitation (satellite)?

.... Hence, they possess the same gravitational potential energy. 2. A stable orbit is one with constant height from earth surface. When a satellite is...

分類：科學及數學 > 物理學 2016年12月26日

5. ### EPE of a neutral object?

...work needs to be done in moving an electron from its orbit to infinity (which is the place where the potential is zero). Such...

分類：科學及數學 > 物理學 2016年12月04日

6. ### Explain why photoelectrons have different speed while their incident photons have fixed energy.?

...electron of an atom, and resulted in the ejection of that electron from its orbit . Depending on where the atom is (on the surface of the photosensitive material...

分類：科學及數學 > 物理學 2016年11月05日

7. ### why cant electrons be excited by fast moving protons?

...level of an orbital electron or completely "kick-off" an electron from its orbit ) if it has high enough energy. Examples are alpha particles...

分類：科學及數學 > 物理學 2016年11月04日

8. ### Why KEmax=hf-work function?

The work function has already accounted for the original kinetic energy and (electrostatic) potential energy of the orbital electron.

分類：科學及數學 > 物理學 2016年10月18日

9. ### Fill in the blanks with words from the vocabulary list. You might have to change the word forms. orbit ,twinkle,planet,concern,galaxy,solar?

Having to change the word forms, we've:- Q1:-orbitting planet (adj/n.) Q2:-has concerned (v) Q3:-galaxy twinkling (adj/v.) Q4:-solar (adj) cell;of the sun;

分類：社會及文化 > 語言 2015年11月09日

10. ### Form5 Phy?

1. Linear speed v=2pi r/period=2*3.14*4.22E8/1.77=14.98E8 m/day = 17338.25 m/s 2. g=v^2/r=17338.25^2/4.22E8=0.712358m/s^2 3. M=gr^2/G=0.712358*(4.22E8)^2/6.67E-11=1.901E27 kg 4. g'=GM/(2r)^2=g/4 g'=v'^2/r'=v'^2/2r v'=sqrt(gr/2...

分類：科學及數學 > 物理學 2015年08月31日