A 500-W electric space heater with a small fan inside heats air by blowing it over a hot electrical wire. For each control volume—(a) wire only, (b) all the room air, and (c) total room air plus the ...Read more
Sumit KumarPundit
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Mazurek Gravity Latest Questions
CV A is the mass inside a piston/ cylinder, and CV B is the mass plus the piston outside, which is the standard atmosphere. Write the energy equation and work term for the two CVs, assuming we ...Read more
If a process in a control mass increases energy E2 − E1 > 0, can you say anything about the sign for 1Q2 and 1W2?
Why do we write E or E2 − E1, whereas we write 1Q2 and 1W2?
A car engine is rated at 110 kW. What is the power in hp?
What is 1 cal in SI units and what is the name given to 1 N-m?
A perfect gas for which the ratio of specific heats is 1.4 occupies a volume of 0.3 m3 at 100 kPa and 27°C. The gas is compressed to 0.06 m3. Find the heat transfer during the compression for ...Read more
An ideal gas of molecular weight 30 and specific heat ratio 1.4 is compressed according to the law pV1.25 = C from 1 bar absolute and 27°C to a pressure of 16 bar (abs). Calculate the temperature at ...Read more
A cylinder contains 1 m3 of gas at 100 kPa and 100°C, the gas is polytropically compressed to a volume of 0.25 m3. The final pressure is 600 kPa. Determine the (a) mass of the gas (b) value ...Read more
A gas of mass 0.35 kg with pressure of 1535 kN/m2 and temperature of 335°C is expanded adiabatically to a pressure of 126 kN/m2. The gas is then heated at constant volume until it reaches 335°C when its ...Read more