la masa sostenida en la mano es de 6 kg. Suponga que la masa del antebrazo y la mano juntos es de 8 kg y que su centro de gravedad (C. G.) está donde se indica en la figura. ¿Cuál es la magnitud de la fuerza muscular (FM)? (g = 10 m/s2). Los ángulos respecto al eje de las X, y las distancias en relación a la articulación del codo y las fuerzas son: FM 50°, 5 cm; CG 30°, 10 cm y el ángulo de la masa 20°, 35 cm. Alguien ayúdeme por favor, necesito la respuesta lo antes posible, daré 25 puntos

As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet.whats one advantage of using electromagnetic in devices