P = F/ A = W( weight )/ A = H(Height) * A * d (density) / A = HA => ...
對繩索施以 F 之力時, 對滑輪的提升力將會為 2F. 所以: ( a ) Block weight = 90N To hold it at rest, force required = 45 N (b...
...153 133 Frequency Weighting : A , C weighting in accordance with IEC 651 type 0 10...
...外力 F, 此物會得到的加速度是 a , 那麼, inertial mass(慣性質量) m = F/ a ------- (1) gravitational mass(重力質量) m的定義是: 把物體放置在重力場強度是g的地方, 此物這時測到重量( weight )是W, 那麼, gravitational mass(重力質量) m = W/g ------- (2) 從這裡...
這一個物體,最後成靜力平衡, 也就是說這個物體不移動,也不會轉動, 為什麼不會移動呢?因為這個物體所受的合力為零, 為什麼不會轉動呢?因為這個物體所受的合力矩為零, 先來看看這個物體受到那些力? 先看超距力,超距力就是沒有碰到但是對他有吸引力的力, 一般來說超距力有...
...on the book = 12 x 0.6 = 7.2 N But since the book's weight is 0.5 x 9.8 = 4.9 N, the frictional force is 4.9 N in order to keep the book stationary. Ans = A