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Tests reveal that a normal driver takes about 0.75s before he or she can react to a situation to avoid a collision. It takes about 3s for a driver having 0.1% alcohol in his system to do same. If such drivers are traveling on a straight road at 30 mph (44 ft/s) and their cars can decelerate at 2ft/s2, determine the shortest stopping distance d for each from the mment they see the pedestrains.
compare air and helium as cooling media for electronic devices. both fluids must exit through an area of 0.025 m2. the
an insulated cylinder having an initial volume of 2 ft3 contains carbon dioxide at 15 psia and 440degf. the gas in then
a vehicle starts from rest then moves rectilinear with a velocity of v 2t2 for 5 s until it reaches a velocity of 50
a mass of 5 lbm is released when it is just in contact with a spring of stiffness 25 lbfft that is attached to the
at a ski resort water at 40 f is pumped through a 3-in diameter 2000ft long steel pipe from a pond at an elevation of
a police car is traveling at a velocity of 15.0 ms due north when a car zooms by at a constant velocity of 37.0 ms due
Steam at 15 bar and 350 degrees C is expanded through a 50% reaction turbine to a pressure of 0.14 bar. The stage efficiency is 80% for each stage and the reheat factor is 1.05.
to test its performance an automobile is driven around a circular test track of diameter d. determine a the value of d
a 10-l radiator filled with superheated water vapor at 200 kpa and 300 degc with both inlet and exit valves closed. the
a robotic-wheeled vehicle that contains science instruments is used to study the geology of mars. the rover weighs 408
a piston-cylinder assembly contains propane initially at 27degc 1 bar and a volume of 0.2 m3. the propane undergoes a
a system carries crude oil of specific gravity 0.8. the volumetric flow rate at point 1 the inlet is 10 ft3s. branch 1
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