Hai điện trở là R1 và R2 được mắc nối tiếp vào giữa hai điểm A, B thì

Asample of a gaseous substance changes into a liquid

Which statement best explains why the overall charge on an atom is zero?

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?