a) A wire 15.0 m long and having a mass of 100 g is stretched under a tension of
ID: 1912689 • Letter: A
Question
a) A wire 15.0 m long and having a mass of 100 g is stretched under a tension of 200 N. If two disturbances, separated in time by 0.030 s, are generated one at each end of the wire, where will the disturbances meet, as measured in meters from the end where the later disturbance originated? b) A person sees a heavy stone strike concrete pavement. A moment later two sounds are heard from the impact: one travels in the air and the other in the concrete, and they are 1.5 s apart in time. Which is heard first? How far away did the impact occur? Use "concrete = 2300 kg/m3, Bconcrete = 20 # 109 N/m2, and the NTP speed of sound in air.Explanation / Answer
a)velocity of each wave = 173.2 m/sec.
position of first disturbance when second i created = 173.2*0.03=5.2 m
time taken for the two disturbances to meet(time measured from the instant second disturbance is given)= (15-5.2)/(2*173.2) =0.0283.
=> distance from the second end of disturbance = 173.2*0.0283=4.9 m .
b) second part is not clear. please elaborate.
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