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The structure of a house is such that it loses heat at a rate of 5400 kJ/h per degree Celcius difference between the indoors and outdoors. A heat pump that requires a power input of 6 kW is used to maintain this house at 21 degrees Celsius. Determine the lowest outdoor temperature for which the heat pump can meet the heating requirements of this house.
determine the minimum time needed for the plate temperature to reach 140°C.
a hunter aims directly at a target 140 meter away. if the bullet leaves the gun ay a speed of 280 m/s, by how much will the bullets miss the target?
a boiler shell is 1.5m in diameter and has plates of thickness 10mm. if the efficiency of the longitudinal joint is 80
a car is to be hoisted by elevator to the fourth floor of a parking garage which is 48 ft above the ground. if the
calculate the work done and the final temperature for the following processespolytropic n 1.0 1.0 kg of air t1 1470
a thin 1 mm thick ?-iron membrane at 250degc is subjected to an atmosphere of hydrogen gas on one side and the
a compressor operating adiabatically is to compress 2.83 m3min of air at 29.4 c and 102.7 knm2 to 311.6 knm2. calculate
a partially full can of soft drink is placed at the outer edge of a childs merry-go-round located r 1.5 m from the
Assume disturbance torques are zero and spacecraft moment of inertia is 400 kg.m2
an insulated vertical piston-cylinder device initially contains 11.56 kg of water 6.94 kg of which is in vapor phase.
a robot unloads a finished component from a machine and places it on a gravity conveyor. the conveyor accelerates from
Describe the main kinds of social mechanisms that are used by people to communicate and collaborate.
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