A figure skater stands on one spot on the ice (assumed frict…
A figure skater stands on one spot on the ice (assumed frictionless) and spins around with her arms extended. When she pulls in her arms, she reduces her rotational inertia and her angular speed increases. Compared to her initial angular momentum, her final angular momentum after she has pulled in her arms must be
Read DetailsA 1200 lb automobile traveling at 35 m.p.h. (51.3 ft/s) is s…
A 1200 lb automobile traveling at 35 m.p.h. (51.3 ft/s) is suddenly stopped when the driver slams on the brakes and the car comes to a complete stop in 1.5 seconds. Assuming the automobile decelerates at a constant rate, determine the force in lbf the brakes supply to stop the car. Recall that 1 lbf = 32.2 lbm ft/s2.
Read DetailsA bacteria colony is exposed to an experimental antibiotic,…
A bacteria colony is exposed to an experimental antibiotic, which kills the bacteria in an exponential manner. Researchers observed that once the bacteria colony is exposed to the antibiotic, the rate of change in the population with respect to time (rate of the extinction) is proportional to the population size.
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