4. A steel plate has been fused to an aluminum plate and immersed in a water bath. You have placed two transducers on either side of the metal plates so that the sound waves have to propagate from the first transducer through water, then through the aluminum plate, then through the steel plate, and finally through water in order to reach the second transducer. What percentage of the original acoustic energy reaches the second transducer

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0

12. a body is a particular amount of matter. it can be a solid, liquid or gas. it can be described as existing in a. size and shape. b. motion and force c. time and space. d. location and movement.