Question

An object has a weight of 8 N when it is weighed in air. But it has an apparent weight of only 4N when fully submerged in water.

A) Draw a freebody diagram of the forces acting on it when it is submerged. I it not hanging from a string

B) Calculate the density of the object

Answer 1

Given w = 8N (in air) w_10 = 4 N (in water) then 1/g(w_wr - w_w) = s_water times v_object 1/9.81(8 - 4) = (1000)(v) therefore v = 4.077 times 10^-4 m^3 then s = mass/volume = (8//9.81)/v rightarrow (0.815)/4.077 times 10^-4 S_object rightarrow 2000.23 KG/m^3