# 雅虎香港 搜尋

1. ### 流體力學Fluid mechanics

On the level between x and y, consider the left tube of the manometer (i.e. the ...12k + (900)gx i.e. 23 = 0.9gx x = 23/[(0.9).(9.81)] m = 2.605 m On the level marked by the lower horizontal line, pressure on the left...

2. ### volcanos on the world

the biggest volcano on earth? The largest volcano in the world is Mauna...volume of about 40,000 cubic kilometers, and an above-sea level area of 5125 square kilometers (these values come...

3. ### Challenging!

As follows: 圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Jul07/Angel1.jpg

4. ### Newton's 2nd law

A boy kicked a ball of 1.2kg on level grassland. The ball rolled for 20m before it stopped. What was the resistance...

5. ### Physics

A man, using a 70 kg garden roller on a level surface, exerts a force on 200N at 30 degrees to the ground. Find the vertical force of the roller on the ground if...

6. ### Physics ( Newton's law)

...s Law, you have to first assume that the frictional force acting on the ball by the grassland is constant , then we can use the formula : v^2 = u^2...

7. ### mercury discharge produce UV?

... original energy level , emitting photons. The energy level of mercury atoms is shown on the diagram given in the web-page below: http://castlelearning.com/review/reference/phys5...

8. ### AL PHY MATTER

... state係-10eV但另一粒就-6eV? A: Depending on the energy levels (electron orbits) where the electron is, energy of electron is different...

9. ### Question on the greatest damage of loud sound

當然係Working in a factory full-time with noise level of 95dB 因為一個工人長時間在高嘈音下工作,95dB一定對耳有...

10. ### 2 A level physics ques to ask!

... emitted, they must pocess energy equal to difference between two energy levels . since the energy quantized, the energy level difference is quantized, thus...