# Yahoo奇摩 網頁搜尋

1. ### 發現外行星的那位科學家，用了什麼公式或基本定律去證明外行星的存在。

...the planet as it falls toward the sun, and decelerates it on the way back out . Kepler's third law The squares of the orbital...

2. ### 點解一個降落傘可以降慢一個人由高空跌落去的速度(10點)

...surface (primarily along its sides, as friction forces at the front and back cancel themselves out ), plus pressure forces, which act in a direction perpendicular to the object&#39...

3. ### 物理折射題目一問 20點!!!!

...total internal reflection occurs. The light ray will be reflected back , and cannot emerge out . (b) Let n be the refractive index. For light to emerge out , angle θ should...

4. ### PHYSICS!!!

a) Taking all upward quantities as positive. Consider the journey of the first 4 seconds: u = 0 m/s a = 9.4 m/s2 t = 4 s v = u + at v = (0) + (9.4)(4) Final velocity = 37.6 m/s s = ut + (1/2)at2 s = (0)(4) + (1/2)(9.4)(4)2 s = 75.2 m Consider the journey just after 4.0 s and...

5. ### 為何海水愈酸，聲音傳播愈遠?

... magnesium sulfate, for example, it can cause a hydroxide ion to "pop out " and then jump back into place, removing a bit of energy from the sound wave. Raising the...

6. ### power of motor

As what you have pointed out , the work done by the back emf equals to mechanical output of the motor. i.e. (current)( back emf)=(torque)(angular...

7. ### balloon-powered boat

...container and seal it in place with plasticine. Weigh the back of the marg container with more plasticine in the centre...an opposite and equal reaction. The air rushing out of the straw is the action, and the equal reaction is...

8. ### I.S. energy(fuel)

Q1. (i) easy to store, e.g. can be easily liqified and stored in a can; (ii) low carbon and low polluting after combustion, thus reducing greenhouse gas emission; (iii) high specific calorific value, i.e. it produces more heat per unit mass than other fuels. Q2: An odourant...

9. ### 2009 AL Physics MC#8 SHM

The particle could go back to P, but the motion is clearly NOT simple harmonic. If the...

10. ### PHY CE 87 MC

...in B. The coil moves away from the solenoid. 呢條題目會否是 out of syllbus? 我記得呢樣野係以前我AL有考, 唔知CE係唔係...

1. ### 相關詞

 back out 意思 outback