Which of the following statements are true? (select all that apply.) a. all moving electric charges give rise to electromagnetic waves. b. at any time, the electric and magnetic field lines are parallel to each other. c. the intensity of the wave drops off as 1/r. d. electromagnetic waves can exert forces on charged particles that they encounter. e. the direction of can be found using the right-hand rule. f. put your four fingers along , sweep them in the direction of and your thumb will point along .

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

Which sound characteristic is not affected by the relative motion of an object

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.