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When a high-speed passenger train traveling at 106 mi/h rounds a bend, the engineer is shocked to see that a locomotive has improperly entered onto the track from a
mi ahead; see Fig. 2-26. The locomotive is moving at 20 ml/h. The engineer of the passenger train immediately applies the brakes.

Phase changes are chemical changes. true or false

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to: