※ 引述《d761023 (jungo)》之銘言：
: 1. Derive the expression for the kinetic energy
: Ekin = (1/2) m v2
: How is the corresponding expression for rotation?
: 2. For a system of particles with mass m1,m2,…mi derive the "center of
: mass" position : xs = (1/M) Σmixi
: and the total momentum of these particles moving with velocities v1,v2…vi
看了一下普物課本，上面說xs = (1/M) Σmixi是定義的(我也不確定)
至於第二部分就把第一部分兩邊微分，vs = (1/M) Σmivi => P = Mvs = Σmivi
若是再維分就可以得到a = (1/M) ΣFi 也就是F = ΣFi 這是我們期望的結果
大概是這樣吧...真抱歉沒幫上什麼忙...
: 3. Derive the frequency expression for a dampened oscillator. How is the
: dependence of amplitude on frequency for resonance? What are beat frequencies?
: 我查書查了好久 可是不知道該怎麼下筆作答 可以請大家幫忙嗎
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