Aloudspeaker at the origin emits a 140hz tone on a day when the speed of sound is 340 m/s. the phase difference between two points on the x-axis is 5.1rad .what is the distance between these two points?

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?