Carbon steel (aisi 1010) shafts of 0.1-m diameter are heat treated in a gas-fired furnace whose gases are at 1200 k and provide a convection coefficient of latex: 100\: \frac{w}{m^2.k}100 w m 2 . k. if the shafts enter the furnace at 300 k, how long (in seconds) must they remain in the furnace to achieve a center-line temperature of 800 k?

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.

The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object

Agas is compressed from vi 0.3 m, p 1 bar to of v2 0.1 m3, p2--3 bar. pressure and volume are related linearly during the process. for the gas, find the work, in kj.