Map e Sapling Learning macmillan learning It is generally a good idea to gain an

Question

Map e Sapling Learning macmillan learning It is generally a good idea to gain an understanding of the "size" of units. Consider the following objects and calculate the magnitude of their momentum in SI units. A ladybug weighing 31.80 milligrams flies by your head at 2.49 mph. Number kg. m/s A 75.20-lb boy walks at 2.25 mph Number kg m/s A Gar weighing 2267 ismoving aa speed of 3.70 mph. Number kg m/s (Scroll down for more questions.) Based on your results above, which of the following scenarios below likely describe an object possessing 1 kg m/s Previous Give Up & View Solution e Check Answer 0 Next Exit Hint

Explanation / Answer

a) 31.80 milligrams = 31.80 * 10-3 * 10-3 kg = 31.80* 10-6kg

    2.49 mph = ( 2.49 * 1609 )meter /60 *60 sec = 1.11 m/s

momentum = mv = 31.80* 10-6kg * 1.11 m/s = 3.54 * 10-5 kg.m/s

b) A 75.20 lb boy walks at 2.25 mph.

75.20 lb = 75.20 * 0.4536 kg = 34.11 kg

2.25 mph = 2.25 * 1609 / (60*60) = 1.00 m/s

momentum = mv = 34.11 kg * 1.00 m/s = 34.11 kgm/s

c) A car weighing 2267 lbs is moving at a speed of 33.70mph.

2267 lbs = 2267*0.4536 kg = 1028.31 kg

33.70 mph = 33.70 * 1609 / (60*60) = 15.06 m/s

momentum = mv = 1028.31 kg * 15.06 m/s = 15488.43 kg m/s

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