A divided highway has two travel lanes in each direction and capacity of 3600 vehicles/hour in each direction. The traffic flow in the eastbound direction between 9:00 AM and 11:00 AM is 3000 vehicles/hour. A traffic accident shuts down the left lane of the highway in the eastbound direction at 9:10 AM, reducing the capacity to 1800 vehicles per hour. The accident is cleared and all lanes open to traffic after 35 minutes.
Assuming the uniform vehicle arrivals, calculate the following:
(a) Duration of the queue caused by the accident (i. e., queue dissipation time).
(b) Maximum queue length.
(c) Maximum (longest) delay of a vehicle in the queue.
(d) Total queue delay (in vehicle-hours).

Aheat pump with refrigerant-134a as the working fluid is used to keep a space at 25°c by absorbing heat from geothermal water that enters the evaporator at 500c at a rate of 0.065 kg/s and leaves at 40°c. the refrigerant enters the evaporator at 20°c with a quality of 23 percent and leaves at the inlet pressure as saturated vapor. the refrigerant loses 300 w of heat to the surroundings as it flows through the compressor and the refrigerant leaves the compressor at 1.4 mpa at the same entropy as the inlet. determine: (a) the degrees of subcooling of the refrigerant in the condenser, b)-the mass flow rate of the refrigerant . (c) the heating load and the cop of the pump, and d)-the theoretical minimum power input to the compressor for the same heating load.