Yahoo奇摩 網頁搜尋

  1. ... mass of sulphur dioxide = 32 + 2 x 16 = 64 g So 3.2 g contains 3.2/64 = 0.05 moles ... Molar mass of fluorine = 2 x 19 = 38 g, so 1.9 g contains 1.9/38 = 0.05 moles = 0...

  2. ...maximum height, t = 0.319 s The hang time is this time times 2 So , the required time = 0.319 X 2 = 0.638 s

  3. ...!Fortunately, they don't ___attack__humans so __scientists_______can __dive____down and get close to them.

  4. 6. As the system is in equilibrium. So , the resultant force is zero in the system. ...weight resolving along the plane - frictional force. So , the net force acting on the object is ...

  5. ... should note that the forces act on two and only two objects. So , F is not the force act on the man + on the rock

  6. ... the block is moving with constant velocity, so there is no change in kinetic energy of the block...in the space, there is no resistance of the rocket. So , the ans is D. as the tennis ball ...

  7. ...the KE is kept constant (speed keeps unchanged). So there is no work done on electron by UNIFORM magnetic field.

  8. ...solidify something, crystallization occur in most case, so as coke. And nucleation (that is form a nucleus...than melting pt.), that is supercooling, so the nucleus can grow continuously. This is homogeneous...

  9. Because friction = 0.65weight So , f = -0.65mg Because friction is the only...2(-6.5)(22.3) u² = 289.9 u= 17.0 ms^-1 So , the speed of the car when it began to skid is...

  10. ... 和 though 相同, 但 thought 是一個完全不同的文字來的 So 是帶出結果的連接詞, 接駁前因和後果 But 是帶出事情的另一面, 並非...