work work work

i just got a job and ive used so much physics and japanese. i had to grab stock today and i loaded a million supplies onto my cart. i had to push the cart up the ramp, which took a lot of work bc it was so heavy. as i stepped into the elevator, i felt the floor go a little lower, which meant that the cables had more tension in them. then, i had to go down another ramp but this time gravity worked with me and helped me roll the cart. i normally do the closing shift so when the customers are gone and we lock up to clean inside, we usually turn the volume up. tonight i was washing the dishes. by the sink, the noise sounded normal but when i walked towards the door to go to the main room, the music was super loud. the sound waves from the different speakers probably crossed right there, creating overlapping troughs and crests, creating a larger sound.