9. To completely describe the motion of an object, you need a. Position
b. Speed
C. Direction of motion
d. All of the above

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

radiation

explanation:

heat is transmitted by radiation