Which of the following is an observation only? * 1 point
A The piece of metal is reed, so it must be hot.
B The street is wet, so it must have rained.
C The table looks like it is made of wood
D The child block is orange.

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.