In order for an object to have a perfectly circular orbit, what one thing must occur? An object must have the exact mass to orbit in a circle.
An object must have the exact speed to achieve the circular orbit.
An object must have enough speed to create escape velocity.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Give an example in which the electrical energy changes to light energy

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.