A rectangular frame with sides of 10 and 15 cm suspended on threads is immersed in water.

A rectangular frame with sides of 10 and 15 cm suspended on threads is immersed in water. What force must be applied to detach the frame from the water surface if the frame mass is 2.5 g?

Given:
a = 10 cm;
b = 15 cm;
m = 2.5 g;
Let’s convert the mass to the SI system (kg)
m = 2.5 * 10 ^ -3 kg;
m1 * g = σ * π * d;
m1 = M / N;
M * g / N = σ * π * d;
F = m * g + Fн;
Fн = σ * L = σ * (2 * a + 2 * b);
Fн = 7.2 * 10 ^ -2 * 0.45 = 3.24 * 10 ^ -2 H;
F = 2.5 * 10 * 10 ^ -3 + 3.24 * 10 ^ -2 = 5.74 * 10 ^ -2 H;
ANSWER: F = 57.4 mN IT IS NECESSARY TO APPLY TO REMOVE THE FRAME FROM THE WATER SURFACE.