lal speed with n whether you ow the person way? Explain. C8M.2 On October 14, 20
ID: 1773755 • Letter: L
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lal speed with n whether you ow the person way? Explain. C8M.2 On October 14, 2012, Felix Baumgartner became the first human being to break the sound barrier while falling freely. He jumped from a capsule that was lofted by a bal- loon to an altitude of 127,852 ft (38.96 km). The speed of a seaside cliff moving faster m height from sound at that altitude is 690 mi/h. (a) Assuming that air friction is negligible at such alti- tudes, how far would he have to fall to reach the speed of sound? (The gravitational potential energy formula given in this chapter is accurate to better than 1% even of a cliff 45 m rock horizon- friction, what at such altitudes. Track units carefully, though!) (b) Friction is not negligible even at this altitude. Baumgart- ner actually reached the speed of sound at an altitude of 109,731 ft (33.45 km). What fraction of the system's change in gravitational energy was converted to inter- nal energy (mostly thermal energy in the air) by the time a vertical arth's radius) om Baumgartner reached the speed of sound?Explanation / Answer
A) By using third equation of motion,
H = v^2 /2g
= (690*0.447)^2 /(2*9.8) = 4853 m answer
B) percentage = 4853*100/(33.45e3) = 14.5% answer
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