Two technicians are discussing oil leaks. technician a says that an oil leak can be found using a fluorescent dye in the oil with a black light to check for leaks. technician b says a white spray powder can be used to locate oil leaks. which technician is correct? a. technician a only
b. technician b only
c. both technicians a and b
d. neither technician a nor b

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

As the distance from a magnet increases, what happens to the magnet force?

Two models of the same compound are shown. in what way is model b better than model a? model b shows the types of elements in the compound, but model a does not. model b shows the three-dimensional shape of the molecule, but model a does not. model b shows how the atoms in the molecule are connected, but model a does not. model b shows the number of atoms of each element in the molecule, but model a does not