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Water at 100 kPa, 25C is brought to the boiling point in a piston/cylinder with an isobaric process. The heat is supplied by a heat pump with the cold side at the ambient temperature of 25C. Assume that the whole process is reversible and find the work input to the heat pump per kg of water.
the weight of a water tank open to the atmosphere is balanced by a counterweight equidistant from the fulcrum. there is
a dragster starts from rest and has an acceleration described by the graph. determine the time t for it to stop. also
air at 20 kpa and 20 degc flows across a flat plate 60 cm long. the free stream velocity is 30 ms and the plate is
a 32.2 lb object is dropped from a 100 feet building. determine the velocity and the kinetic energy at the 50 feet
a 250mm long brass bar cte 20.5x10-6 0c is setup as shown below. initially when the temperature is 150c there is a
Tin exists in two solid forms, white and gray tin. While white tin has a bodycentered tetragonal structure, the structure of gray tin is diamond cubic. The enthalpy and entropy changes associated with the transformation of gray tin to white tin at 29..
a closed system undergoes a cycle consisting of two processes. during the first process 40 btu of heat is transferred
A 17-tooth 20 normal pressure-angle helical pinion with a right-hand helix angle of 30 rotates at 1800 rev/min when transmitting 4 hp to a 52-tooth helical gear. The normal diametrical pitch is 10 teeth/in, the face width is 1.5 in, and the set has a..
an intermittent wind tunnel is designed for a mach number of 4 at the test section. the tunnel operated by sucking air
an engineer needs to monitor a flow of 20degc gasoline at about 250plusmn25 galmin through a 4- in-diameter smooth
The spool has a mass of 75 kg and a radius of gyration . It rests on the inclined surface for which the coefficient of kinetic friction is . If the spool is released from rest and slips at A, determine the initial tension in the cord and the angul..
a stationary gas turbine engine is used for generating electricity during times of peak demand. dry air at tamb 20oc
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