Arre, pulley wala problem… humne apne Applied Mechanics ke paper mein kiya tha. Pehle free-body diagram banao, fir F=ma lagao har block pe, tension same rahegi. 3kg waala upar jayega, 5kg waala neeche, a=(m2-m1)g/(m1+m2) se acceleration aayega.
Par yaad aaya, jab hum workshop mein steel plates uthate the, wire rope ka tension sirf formula se nahi aata tha… worn-out pulley se friction badh jata tha, calculations se thoda hatke. Isiliye ab mai ghar pe gram ke thele uthate waqt dori ki motai zaroor dekhta hoon.
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