A metal block with a mass of 4.0 kg is hanging from a string.The block is lowered into a full beaker of water,causing 1,000 cm³ of water to spill out of the beaker.What is the tension in the string while the block is completely underwater? A)9.8 N B)29 N C)38 N D)40 N E)49 N

Question

Quizplus · Accepted Answer

The tension in the string is equal to the weight of the block minus the buoyant force acting on the block. The buoyant force is equal to the weight of the water displaced by the block. In this case, the block displaces 1,000 cm³ of water, which has a mass of 1 kg. Therefore, the buoyant force is 9.8 N. The weight of the block is 4.0 kg * 9.8 m/s² = 39.2 N. Therefore, the tension in the string is 39.2 N - 9.8 N = 29.4 N.

A Metal Block with a Mass of 4