It is generally a good idea to gain an understanding of the \"size\" of units. C

Question

It is generally a good idea to gain an understanding of the "size" of units. Consider the following objects and calculate their kinetic energy in SI units. A ladybug weighing 31.80 milligrams flies by your head at 2.51 mph. A 15.0-lb bowling ball slides (not rolls) down an alley at 10.88 mph. A car weighing 2061 lbs is moving at a speed of 32.50 mph. Based on your results above, which of the following scenarios below likely describe an object possessing 1 joule of kinetic energy. A tiger running after prey An elephant running across a field A cat walking down a sidewalk A beetle walking across a jungle floor A mosquito flying through a swamp

Explanation / Answer

1) 2.37 mph = 1.05948m/s so KE = 0.5 * 29.6 x 10 ^ -3 * 1.05948^2 = 0.0166 J 2) 14.8 lbs = 6.71317 kg 10.52 mph = 4.70286 m/s KE = 74.237 J 3 ) 1958 lbs = 888.134 kg 31.30 mph = 13.9924 m/s KE = 86942.66 J

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