You are standing at the midpoint between two speakers, a distance d away from each. the speakers are playing the exact same sound of frequency 170 hz in phase with each other. describe what happens when you walk 1.5 m directly toward one of the speakers. assume the speed of sound is 340 m/s. also assume you can't hear any sounds except those produced by the speakers.

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions

Failure to accomplish erikson’s psychosocial task of late adulthood leads to despair. a. true b. false