Answer to Question #168387 in Physics for Andu

Question

6. The small OAB lever, which is placed in the pressure cooker, works in accordance with the moment rule. The force F of the vapor pressure creates the opposite moment in relation to the axis of rotation O, of the lever. Calculate this force, when it is known that the mass of sphere B is m = 200 g, while OA = 0.5 cm and OB = 5 cm.

Answer 1

$$F_1r_{OB}=F_2r_{OA},$$ $$F_2=\dfrac{F_1r_{OB}}{r_{OA}}=\dfrac{0.2\ kg\cdot9.8\ \dfrac{m}{s^2}\cdot5\cdot10^{-2}\ m}{0.5\cdot10^{-2}\ m}=19.6\ N.$$