Physics, 10.09.2021 19:40 NREYESLDS2806
Air is contained in a sealed vertical piston-cylinder apparatus fitted with an electrical resistor. The atmospheric pressure above the piston is 1.01 bar. The piston has a mass of 45.36 kg and a surface area of 0.093 m2. Electric current passes through the resistor, and the volume of the air slowly increases by 0.045 m^3 while its pressure remains constant. The mass of the air is 0.27 kg, and its specific internal energy increases by 41.86 kJ/kg. The air and piston are at rest initially and finally. The piston and cylinder are made of ceramic, which is a good insulator. Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is g= 9.8m/s^2.
Required:
Determine the heat transfer from the resistor to the air, in kJ, for a system consisting of the air alone.
Answers: 3
Physics, 22.06.2019 13:40, crayons18
An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.
Answers: 2
Physics, 22.06.2019 21:40, lottie2306
Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.
Answers: 3
Physics, 23.06.2019 01:10, paige3673
Aheat engine that operates on a carnot cycle has an efficiency of 0.420 when its low-temperature reservoir is at 10 ∘c. part aby how many degrees celsius must you increase the temperature of the high-temperature reservoir to increase the efficiency to 0.600 if you continue to use the same low-temperature reservoir?
Answers: 1
Air is contained in a sealed vertical piston-cylinder apparatus fitted with an electrical resistor....
Mathematics, 22.03.2021 17:50
Mathematics, 22.03.2021 17:50
Computers and Technology, 22.03.2021 17:50
Mathematics, 22.03.2021 17:50
History, 22.03.2021 17:50