Physics, 12.09.2019 21:20 dantedelafuente
On october 21, 2001, ian ashpole of the united kingdom achieved a record altitude of 3.35 km (11 000 ft) powered by 600 toy balloons filled with helium. each filled balloon had a radius of about 0.54 m and an estimated mass of 0.27 kg. (a) estimate the total buoyant force on the 600 balloons.
Answers: 1
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4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)
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On october 21, 2001, ian ashpole of the united kingdom achieved a record altitude of 3.35 km (11 000...
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