A man uses a crowbar 2 m long to lift a concrete block weighing 600 N as shown in Figure 1.96. Calculate the position of the pivot if an effort of 150 N is applied. Determine: a) the mechanical advantage, b) velocity ratio, c) efficiency of the lever.

Ili kukokotoa nguvu ya wastani, tunahitaji kwanza kukokotoa kazi iliyofanywa na kisha kugawanya kwa muda uliotumika. Kazi iliyofanywa katika kupanda ngazi ni sawa na mabadiliko katika nishati uwezo. Step 1: Kokotoa urefu jumla. Kila ngazi ina urefu wa 20 cm, ambayo ni sawa na 0.20 m. Kuna ngazi 50. Urefu jumla (h) = Idadi ya ngazi × Urefu wa kila ngazi h = 50 × 0.20 m h = 10 m Step 2: Kokotoa kazi iliyofanywa. Kazi iliyofanywa (W) ni sawa na nishati uwezo iliyopatikana, ambayo hutolewa na formula W = mgh, ambapo m ni uzito, g ni mvutano wa mvuto (9.8 m/s^2), na h ni urefu jumla. W = mgh W = 40 kg × 9.8 m/s^2 × 10 m W = 3920 J Step 3: Kokotoa nguvu ya wastani. Nguvu ya wastani (P) hutolewa na formula P = (W)/(t), ambapo W ni kazi iliyofanywa na t ni muda uliotumika. P = 3920 J5 s P = 784 W Nguvu ya wastani ya mtu huyo ni 784 W. Tuma swali linalofuata 📸