1. The problem statement, all variables and given/known data You are given a 10cm Cube of aluminum with Density of 2700kg/m is submerged in water and the weight in water is 13N. If a cavity exist how big is it? 2. Relevant equations The equation i used were B = V * P_water * g to find buoyancy. To find the enclosed cavities i used V_0 = V - V_c = B/(p_water * g) - W/(p_m*g) 3. The attempt at a solution for B i did volume of the cube was .1^3 * 1000KG/M for water * 9.8 and then when plugging in to the equation for enclosed cavities i got 9.8/(9.8 * 1000kg/m) - 13N/(2700KGM * 9.8) from there i got stuck since i got a number that was really small.