A2 kg bowling ball is 2.5 m off the ground on a post when it falls just before it reaches the ground it is traveling 7 m/s assuming that there is no air assistance which statement is true 1mechanical energy is not conserved 2the mechanical energy is conserved 3the initial potential energy is less than the final connecticut energy 4the initial potential energy is greater than the final connecticut energy

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.