Alguien ayuda, ¿porque la velocidad del sonido es constante en el efecto Doppler?

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

According to newton’s law of universal gravitation, which statements are true? as we move to higher altitudes, the force of gravity on us decreases. as we move to higher altitudes, the force of gravity on us increases. as we gain mass, the force of gravity on us decreases. as we gain mass, the force of gravity on us increases. as we move faster, the force of gravity on us increases.

Asimple electrochemical cell contains two electrodes? t or f