What is an example of a physical change?having less ash than the paper that was burned to form it. Ice forming and then melting back into water. Rust having a different identity than the iron it forms on. The irreversible reaction of vinegar and baking soda

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell