2 a) Which of the following statements is true? i) Sound is produced in a vibrating environment. ii) Sound can easily propagate in a vacuum. iii) You can talk to your friend on the Moon. iv) Sound is propagated in the air by successive compressions and thinning of the air. V) Too much noise can damage the ears. b) For any statement that is not correct, say what is wrong. Rewrite the statement correctly. 3 Native Americans could hear horses approaching by bringing their ears to the ground. Explain why?

Acommon procedure for measuring the velocity of an airstream involves the insertion of an electrically heated wire (called a hot-wire anemometer) into the airflow, with the axis of the wire oriented perpendicular to the flow direction. the electrical energy dissipated in the wire is assumed to be transferred to the air by forced convection. hence, for a prescribed electrical power, the temperature of the wire depends on the convection coefficient, which, in turn, depends on the velocity of the air. consider a wire of length l = 20 mm and diameter d = 0.5 mm, for which a calibration of the form v = 6.25 ă— 10â’5 h2 has been determined. the velocity v and the convection coefficient h have units of m/s and w/m2 â‹… k, respectively. in an application involving air at a temperature of tâž = 25â°c, the surface temperature of the anemometer is maintained at ts = 75â°c with a voltage drop of 5 v and an electric current of 0.1 a. what is the velocity of the air?