Which set up correctly uses an electric current to produce a strong magnet? A: A steel rod that carries electricity makes the rod become a strong magnet.

B: The pieces of steel in a battery that stores electricity become a strong magnet.

C: Copper wires put next to pieces of steel make the steel become a strong magnet.

D: A steel rod wrapped in a current-carrying wire turns the rod into a strong magnet.

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

(01.02 mc) nicole pushes her bike up a hill. overhead, the sun exerts a gravitational force on earth. which statement is true about the bike and earth? they both experience contact forces. they both experience non-contact forces. the bike experiences a non-contact force and earth experiences a contact force. the bike experiences a contact force and earth experiences a non-contact force. they both experience non-contact forces.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?