Jacob works in a store that sells jeans. Jacob is stacking a new delivery of jeans to display on top of the old jeans so that they are touching. In Stack 1, the top pair of jeans is larger than the bottom pair. In Stack 2, both pairs of jeans are the same size as the bottom pair in Stack 1. What does the different amount of energy mean for the temperature of all four pairs of jeans, and how will the two top pairs of jeans compare in temperature after a while? Why?

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

i think the answer is a, hope this : )

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia