A2-kg object is moving horizontally with a speed of 4 m/s. how much net force is required to keep the object moving at this speed and in this direction?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

The mantle is made up of which structural zones?