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/
A 3-in. diameter rod of copper is to be reduced to a 2-in. diameter rod by being pushed through an opening. The modulus of elasticity for the copper is 17 x 106 psi and the yield strength is 40,000 psi.
If the coefficient of friction between the axe and grindstone is 0.4, find the normal force with which the axe was pressed aginst the grindstone.
The compression and power stroke efficiencies are 90%. Using the provided engine data, determine the charge mass (grams). The cut-off ratio.
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