Calculate time necessary for the rod to cool temperature
A long stainless steel rod (18% Cr, 8% Ni) has a diameter of 6.4 mm. It is initially at a uniform temperature of 25 °C and is suddenly immersed in a liquid at 150 °C with h = 120 W/m2-°C. Calculate the time necessary for the rod to cool to 120 °C.
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A cylinder has 0.1 kg air at 25oC, 200 kPa with a 5 kg piston on top. A valve at the bottom is opened to let the air out and the piston drops 0.25 m towards the bottom.
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It is initially at a uniform temperature of 25 °C and is suddenly immersed in a liquid at 150 °C with h = 120 W/m2-°C. Calculate the time necessary for the rod to cool to 120 °C.
Nitrogen gas in an expandable container is cooled from 50.0°C to 10.0°C with the pressure held constant at 3.00 x 105 Pa. The total heat liberated by the gas is 2.50 x 104 J. Assume that the gas may be treated as ideal. For N2 , CV = 20.76 J/
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