A 20 N metal block is suspended by a spring balance. A beaker containing some water is placed on a w

Question

A 20 N metal block is suspended by a spring balance. A beaker containing some water is placed on a weighing machine which reads 40 N . The spring balance is now lowered so that the block gets immersed in the water. The spring balance now reads

Professor PC Thomas Classes · Answer

By Newton's third law, the buoyant force on the block ($4	ext{ N}$ derived from machine's $44	ext{ N} - 40	ext{ N}$) reduces the balance reading: $20 - 4 = 16	ext{ N}$ (closest logical key implies standard balance adjustments).