A temperature of 100 deg F is almost exactly,

Compute the maximum possible efficiency of heat engine operating between temperature limits of 100 deg C and 400 deg C.

A Carnot engine operates between 444K and 555K. What is the thermal efficiency?

What is the ideal compression ratio of an Otto cycle that uses air as the gas and has an efficiency of 50%?

The maximum thermal efficiency that can be obtained in an ideal reversible heat engine operating between 1540 deg F and 340 deg F is?

How much external work is done by an ideal has expanding from a volume of 3.0 liters to a volume of 30.0 liters against a constant pressure of 2.0 atm.

If air is at a pressure of 135Pa ad temperature of 440K, what is most nearly the specific volume? Air's gas constant is 88.81J/kg-K and air can be modelled as an ideal gas.

1.36kg of air are held at 6.89kPa and 38°C. Given that Rair = 88.89J/kg-K, what is most nearly the volume of the container?

What is most nearly the change in internal energy of 2.27kg of oxygen gas when the temperature changes from 38°C to 49°C? Cv = 0.658kJ/kg-K.

Water, Cv=4.2kJ/kg-K is being heated by a 1500W heater. What is most nearly the temperature rate of change for 1kg of water?

Approximately how much power is required to isothermally compress 23m^3/min of air from 101.5kPa to 828.5kPa?

Gas is enclosed in a cylinder with a weighted piston as the top boundary. The gas is heated and expands from 0.04m^3 o 0.10m^3 at constant pressure of 200kPa. Calculate the work done by the system.

What is most nearly the energy of a photon of wavelength 0.1nm?

Solar collectors generates 1kW/m^2 of thermal energy using the sun's energy. A collector with an area of 1m^2 heats water. The water flow rate is 30L/min. What is most nearly the temperature rise in the water? The sp. heat of water is 4200J/kg-°C.

A copper sphere 0.3m in diameter radiates power through a vacuum to an environment at 273K. The emissivity of copper is 0.15 and the sphere is at 60°C. The power radiated is most nearly,

A home has brick walls 15mm thick. On a cold winter day, the temperature of the inner and outer surfaces of the walls are found to be 20°C and -12°C respectively. There is 120m^2 of exterior wall space. The thermal conductivity of brick is 0.711J/m-s -°C. Most nearly how much heat is lost through the walls per hour?

In a constant temperature closed system process, 100BTU of heat are transferred to the working fluid at 100°F. What is the change in entropy of the working fluid?

A piston-cylinder system contains a gas that expands under a constant pressure of 57 kPa. If the piston is displaced 0.3 m during the process, and the piston diameter is 0.6 m, what is the work done by the gas on the piston?

An engine burns a liter of fuel each 12 min. The fuel has a specific gravity of 0.8 and a heating value of 45 MJ/kg. The engine has an efficiency of 25%. What is most nearly the brake horsepower of the engine?

Air undergoes an isentropic compression from 0.31 N/cm2 to 3.87 N/cm². If the initial temperature is 20°C and the final temperature is 327.5°C, what is most nearly the work done by the gas?

Find the density of air at vacuum of 40 kPa and -40°C in kg/cu.m. Assume 1 atm = 100 kPa.

At 0 deg C and under a pressure of 100 atm the compressibility factor of oxygen is 0.927. Calculate the weight of oxygen in kg necessary to fill a gas cycle of 100 L capacity under given condition.

A temperature of a body is measured to be 26 ½C. Determine the temperature in ½F.

An automobile tire with a volume of 0.6 m^3 is inflated to a gage pressure of 200 kPa. Find the mass of air in the tire if the temperature is 20 ½C.

A 1/3 hp pump runs for 20 minutes, what is the energy used?

If the average in a nuclear reaction is 200MeV/fission, what is the power output of a reactor experiencing 2.34x10^19 fissions/s?

Solar collectors generates 1kW/m^2 of thermal energy using the sun's energy. A collector with an area of 1m^2 heats water. The water flow rate is 30L/min. What is most nearly the temperature rise in the water? The sp. heat of water is 4200J/kg-°C.

Approximately how much power is required to isothermally compress 23m^3/min of air from 101.5kPa to 828.5kPa?

In an adiabatic, isentropic process, pl = 4.28N/cm^2, p2 = 6.42N/cm^2 and T1 = 388K. The ratio of specific heats is 1.4. What is most nearly the value of T2?

A refrigerator has a COP of 4 and can remove 20,000kJ/hr of heat from a cold body. Find the hp of the motor.