Ответ:
D = 1,24 м
Объяснение:
V = (4/3)*π*R³
R = (D/2)
R³ = D³/8
V = (4/3)*π*R³ = (4/3)*π*D³/8 = (1/6)*π*D³
D = ∛ (6*V / π)
D = ∛ (6*1/3,14) ≈ ∛ (1,91) ≈ 1,24 м
F=ma=mV/t; ⇒ V=Ft/m=300·0.05/0.3=50м/с;
252
200 ÷ 100 = 2;
2 × 26 = 52;
52 + 200= 252.