四、如圖四所示之電源轉換器,假設二極體視為理想元件,變壓器之匝數比依序如圖所標示,其中一次側 N1 之激磁電感 Lm = 5 mH。若開關之操作頻率 f = 35 kHz,責任週期(duty cycle)D = 0.4。請計算以下參數:
1. The pair of pulleys shown in Fig. 1 is used to lift a 80 kg block 0.25 m. The
constant acceleration of the block during the lift is , and the
pulleys and rope have negligible inertia and negligible friction. What
is the tension