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A Vehicle A is stuck on the railroad tracks as a train B approaches with a speed of 120 km/h. As soon as the problem is detected, the train's emergency brakes are activated, locking the wheels and causing the trains's wheels to slide relative to the tracks. If the cofficient of kinetic friction between the wheels and the track is .2, determine the minimum distance d at which the brakes must be applied to avoid a collision under the following circumstances. a) The train consists of just a 195,000 kg locomotive. b) The train consists of a 195,000 kg locomotive ans a string of cars whose mass is 10*10^6 kg, all of which are able to apply brakes and lock their wheels. c) The train consists of a 195,000 kg locomotive and a string of cars whose mass is 10*10^6 kg, but only the locomotive is able to apply its brakes and lock its wheels. Treat the train as a particle, and assume that the railroad tracks are rectilinear and horizontal. Please provide a free body diagram if possible.
A large tower is to be supported by a series of steel wires; it is estimated that the load on each wire will be 13,300 N (3000 lbf). Determine the minimum required wire diameter, assuming a factor of safety of 2 and a yield strength of 860 MPa (12..
determine if a simple supported w12 x 26 a36 steel beam has the capacity to support loads that produce 50ksi of
A similar measurement is made applying the force parallel to one of the cube axes. Explain why the two measurements give different values of the elastic modulus.
an egg can be approximated as a 5.5 cm diameter sphere with rho 1020 kgm3 cp 3.32 kjkgc. determine the heat transfer
a ball is shot vertically into the air 50 m/s 108m from the ground. 6 seconds later, another ball is shot vertically into the air 20 m/s 58m from the ground. Find the distance where they meet in the air from the ground.
a thin-flat plate having a length of l 10 cm is heated by a constant-heat flux from the bottom and cooled by an air
in order to improve business the wiessherr biergarten in augsburg germany began a new gimmick promotion the bier
A piston-cylinder device initially contains 50L of liquid water at 40 degrees C and 200kPa. Heat is transferred to the water at constant pressure until entire liquid is vaporized.
the pressure in a partially evacuated enclosure is 26.8 in hg vacuum when the local barometer reads 29.5 in hg.
a hot dog can be considered to be a cylinder 12 cm long and 2 cm in diameter whose properties are rho 980 kgm3 cp 3.9
a 20 kg object is pulled across a flat surface with a force of 100 n. the force is applied at a 30deg angle to the
shape memory alloys are metals that undergo a change in crystaline structure within a relatively narrow temperature
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