Hola alguien habla español o valenciano acà doy 10 puntos y tengo pocos

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

Positive ions differ from neutral atoms in that