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Helium gas is compressed from 14 psia and 70°F to 120 psia at a rate of 5 ft3/s. Determine the power input to the compressor, assuming the compression process
Convert the following temperatures from °F to °C
At the beach, atmospheric pressure is 1025 mbar. You dive 30 ft down in the ocean and you later climb a hill up to 300 ft elevation
An insulated rigid tank initially contains 1.4-kg saturated liquid water and water vapor at 200°C. At this state, 25 percent of the volume is occupied by liquid
A vertical cylinder/piston contains R-22 at -20°C, 70% quality, and the volume is 50 L. This cylinder is brought into a 20?C room, and an electric current
A saturated air-water vapor mixture at 20 oC, 100 kPa, is contained in a 5-m3 closed tank in equilibrium with 1 kg of liquid water. The tank is heated to 80oC.
A rigid tank contains 1 kmol of Ar gas at 220 K and 5 MPa. A valve is now opened and 3 kmol of N2 gas is allowed to enter the tank at 190 K and 8 MPa.
A piston/cylinder contains 50 kg of water at 200 kPa with a volume of 0.1 m3. Stops in the cylinder are placed to restrict the enclosed volume to 0.5 m3 similar
A large fraction of the thermal energy generated in the engine of a car is rejected to the air by the radiator through the circulating water
Determine the voltage gain when the op-amps is ideal. Determine the exact voltage gain when A = 105.
3 kg of liquid water initially at 12°C is to be heated at 95°C in a teapot equipped with a 1200-W electric heating element inside
A 0.3-m3 rigid tank contains 0.6 kg of N2 and 0.4 kg of O2 at 300 K. Determine the partial pressure of each gas and the total pressure of the mixture.
How to choose the circuit current direction ? what is the conditon of generator working regime and consumer working regime of an electrical source.
What are the important modes of heat transfer for a person sitting quietly in a room? What if the person is sitting near a roaring fireplace?
Two large steel plates at temperatures of 90° and 70°C are separated by a steel rod 0.3 m long and 2.5 cm in diameter. The rod is welded to each plate.
Upper and lower surfaces of a bus bar are convectively cooled by air at T8 with hu h1. The sides are cooled by maintaining contact with heat sinks at To
Ultra-pure hydrogen is required in applications ranging from the manufacturing of semiconductors to powering fuel cells.
To augment heat transfer between two flowing fluids it is proposed to insert a 100-mm-Iong, 5-mm-diameter 2024 aluminum pin fin through the wall
To measure thermal conductivity, two similar 1-cm-thick specimens are placed in an apparatus shown in the accompanying sketch
To enhance heat transfer from a silicon chip of width W = 4 mm on a side, a copper pin fin is brazed to the surface of the chip
To reduce the threat of predators, the sand grouse, a bird of Kenya, will lay its eggs in locations well removed from sources of groundwater
Two configurations are being considered in the design of a condensing system for steam at 1 atm employing a vertical plate maintained at 90°C
To determine air velocity changes, it is proposed to measure the electric current required to maintain a platinum wire of 0.5-mm diameter at a constant
The thermocouple (TC) installation on a snowmobile engine cylinder head is shown in the schematic. The TC wire leads are attached to the upper and lower surface
The thermal conductivity of silver at 212°F is 238 Btu/(h ft °F). What is the conductivity in SI units