Question

A block of wood is tied to the bottom of a large container of water so that the block is completely submerged. The density of the block is 800 kg/m3 and its volume is 0.030 m3. What is the tension in the rope holding the block down in the water

Answer 1

Answer:

58.9 N

Explanation:

The wood is buoyed up by the mass of the water is displaces

  wood volume = .030 m^3 = 30 000 cm^3

   mass of water displaced = 30 000 g = 30  kg

wood mass =   800 kg/m^3  * .030 m^3 = 24 kg

so tension in string    = mg   = (   30 kg - 24 kg) * 9.81 m/s^2 = 58.9 N