Which action makes use of a magnetic force? A.
A person puts a bank card in an electronic reader to buy an item.

B.
A parent measures a child’s temperature by touching a thermometer to the child’s head.

C.
A store clerk finds the price of an item by moving the item over a laser light.

D.
A student measures the mass of a book using a spring scale.

Which is special about a dc circuit ? a. it has both series and parallel components b. it has only series or only parallel components c. charge moves in a single direction d. charge moves back and forth quickly

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano.the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force