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The goose has a mass of 22.1 lb (pounds) and is flying at 8.30 miles/h (miles per hour). what is the kinetic energy of the goose in joules?

Respuesta :

m = 22.1 lbm, the mass
v = 8.3 mi/h, the speed

Note that
1 mi/h = (5280 ft/mi)*(1/3600 h/s) = 1.4667 ft/s
Therefore
v = 8.3*1.4667 = 12.1736 ft/s

By definition, the KE (kinetic energy) is
KE = (1/2)*m*v²
      = 0.5*(22.1 lbm)*(12.1736 ft/s)²
      = 1637.57 lb-ft

Because 1 lb-ft = 1.35582 J, the KE is
KE = 1637.57*1.35582 = 2220.3 J

Answer: 2220.3 J

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