You purchased a new set noise-cancelling headphones to wear on your plane ride to hawaii last month. the intensity of the background noise on the plane (prior to wearing the headphones) was 4 x 10-2 w/m2. when wearing the headphones, the intensity of the noise was reduced to 2 x 10-3 w/m2. how much noise reduction (in db) did the headphones provide?

Amoving company collects data about couches they move and displays the data in a table. the force along the ramp, the angle of the ramp, and the height the couch is raised to are shown. which statements correctly compare the work done to move the couches? check all that apply. the same amount of work is done for couches 1 and 3. the same amount of work is done for couches 2 and 3. the work for couch 1 is greater than the work for couch 2. the work for couch 2 is less than the work for couch 3. the work for couch 3 is greater than the work for couch 1. the work for couch 2 is greater than the work for couch 1.