Si cierta enfermedad está presente, existe una probabilidad del 99% de que una prueba sanguínea sea efectiva para detectarla. Sin embargo, la prueba también ofrece un resultado falso positivo en un 2% de los pacientes sanos. (Es decir, si una persona sana se somete a la prueba, existe una probabilidad igual a 0,02 de que la prueba indique que esa persona está enferma.) Supongamos que un 1.5% de la población padece la enfermedad.

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis