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- for the power wouldn't it be desnity x Q x hp / 0.75 ? or did my professor make a mistakeExplain the relationship that exits between the potential energy well and some physical and mechanical properties of materials.An electric motor is used to drive the shaft of a small water pump. During a performance test, the torque on the motor shaft is found to be 5.014 N⋅m when the motor is drawing 638.52 W of electrical power. What is the rotational speed of the shaft in rpm?
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- If the LHV of wood logs is 16 MJ/kg, how much energy is available for 2 kg of wood logs? If I burn all wood logs, what is the maximum energy in the heat I could obtain? If 30% of heat can be changed to electricity, how much electricity will be generated? If the heating value (LHV) of dry wood is 20 MJ/kg, what is the maximum energy 20 tonnes of wood could provide? If 60 % of the heat in wood could be transferred, how much heat can be transferred? If the heating value of coal is 40 MJ/kg, how much energy is available for 10 tonnes of coal? If I burn wood logs (LHV =16 MJ) to obtain the same amount of heat, how much (in tonne) of wood logs do I need to burn?A 1.5m diameter spherical balloon containing air at (K + 10) kPa is cooled such that the volume is reducedby 25%. For the process, the pressure is proportional to the square of the sphere’s diameter. What is the workdone by the surrounding? IMPORTANT NOTE: K=821A vertical piston-cylinder assembly containing water is being heated on a stove. During this process, 140kJ of heat is transferred to the water’s expansion process (because of the heat addition), -20 kJ of work is done. Also, there is 50 kJ heat loss from the assembly. What is the water’s change of internal energy because of the heat addition process? Draw the diagram.