74.3 dB. What would be the sound level produced by a chorus of 17 such singers (all singing at the same intensity at approximately the same distance as the original singer)? Answer in units of dB.

(a) if the pressure in gas is doubled while its volume is held constant, by what factor do (i) vrms and (ii) change? (b) is it possible to boil water at room temperature (20oc) without heating it? explain.

Which of the following is not a physical property of mattera. melting pointb. heat of combustionc. viscosityd. boiling point

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.