# Yahoo奇摩 網頁搜尋

廣告

1. ### momentum and time

... Law. 2015-07-29 20:21:42 補充： Your further question: I don 't know where you get this equation: momentum =f(time), but it is not correct...

2. ### 物理 energy of electron, radius

1. This follows the definition in mechanics. Potential energy for repulsice force is +ve and for attractive force is -ve. The reason behind is that wok needs to be done when two +ve charges come near to each other, and -ve work...

3. ### F.4 Physics

...must be 0'C, as ice and water are in thermal equilibrium. You don 't need to do any calculation at all. Just answer the question by argument...

4. ### fundamental force of nature

... between two photons? Ans: Nothing, as photons don 't have mass,electric charge,colour charge

5. ### Phy: concept of potential

In brief, "electric potential" is analogous to "height" in mechanics (i.e. in a gravitational field). 1. V = U/q is the definition of potential, i.e. energy per unit charge. As said above, the analogy in mechanics is : h = (mgh)/mg where h...

6. ### 推薦phy,chem書PLZ

Why not read materials on the web. The following physics web-sites are useful: 1. Hyper-physics: http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html There is also a link from this site to topics...

7. ### 放大器計數問題 唔太明白

i don 't know,sorry!

8. ### physics motion question.

...m Hence, average velocity = displacement/time = 0/100 m/s = 0 m/s 2. I don 't know wthether there is a typo at your question. Is it 4 m...

9. ### physics questions

...momentum of the rocket by the water is pointing opposite, upwards. You don 't need to mix up and misunderstand the rocket and water, they can be analysed...

10. ### 3 physics MCQs

1. Let N be the normal reaction and Ff be the frictional force. Hence, consider the horizontal components, we have N.sin(5) + Ff.cos(5) = 2400 x 10^2/60 i.e. N.sin(5) = 4000 - Ff.cos(5) ------------ (1) Consider the vertical components...

廣告

1. ### 相關詞

 don't starve don寢具評價 don't worry don寢具 i don't care don床包評價 don't don寢具好嗎