Part A An old mining tunnel disappears into a hillside. You would like to know how long the tunnel is, but it's too dangerous to go inside. Recalling your recent physics class, you decide to try setting up standing-wave resonances inside the tunnel. Using Based on your measurements, how far is it to the end of the tunnel? your subsonic amplifier and loudspeaker, you find resonances Express your answer with the appropriate units. at 5.0 Hz and 7.0 Hz, and at no frequencies between these. It's rather chilly inside the tunnel, so you estimate the sound speed to be 340 m/s. ? L = Value Units Submit Request AnswerPart A Biologists think that some spiders "tune" strands of their web to give enhanced response at frequencies corresponding to those at which desirable prey might struggle. Orb spider web silk has a typical diameter of 20 um, and spider silk has a density of To have a fundamental frequency at 100 Hz, to what tension must a spider adjust a 12-cm-long strand of silk? 1300 kg/m'. Express your answer with the appropriate units. HA ? Ts = 4.44 . 10 -4 Nm Submit Previous Answers Request AnswerPart A A steel wire is used to stretch a spring. An oscillating magnetic field drives the steel wire back and forth. A standing wave with three antinodes is created when the spring is stretched 7.00 cm. (Figure 1) What stretch of the spring produces a standing wave with two antinodes? Express your answer with the appropriate units. ? Ax = 3.11 cm Submit Previous Answers Request AnswerA Doppler unit that measures blood flow emits 5.0 MHz v Part A ultrasound. The ultrasound waves reflect from blood flowing through an artery that makes a 45 angle with the ultrasound beam. The technician measures an upward frequency shift of What is the speed of the blood flow? Use the speed of sound value for soft tissue. 4'4 in the returning sound waves' E\"Frees; your answer to three significant figures and include the appropriate units. memo? Prevlous Answers Blames