Answer:
m = 1,429 10⁻⁴ kg
Step-by-step explanation:
For the object to remain floating, the translational equilibrium condition must be met, we set a reference system where the vertical upward direction is positive
F_e -W = 0
F_e = W
q E = m g
we clear
m =
let's calculate
m =
m = 1,429 10⁻⁴ kg