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Hot air enters a rectangular duct (20-cm-wide, 25-cm-high, and 5-m-long) at 100 kpa and 60 C at an average velocity of 5 m/s. while air flows through the duct, it gets cool down (loses energy) so that air leaves the duct at 54 C. Determine the rate of heat loss from the air under steady condition.
Why do thermoplastics tend to become brittle in very cold weather?
A lap joint needs to be designed using 20-mm diameter bolts to carry a load of 120 kN on the connecting plates. If the shear stress in each rivet is not to exceed 90 MPa, determine the number of bolts needed.
a gas in a piston-cylinder assembly undergoes a compression process for which the relation between pressure and volume
a passive solar house that is losing heat to the outdoors at an average rate of 50000 kjh is maintained at 22 c at all
explain the tapping operation and the steps to follow peripheral milling is performed on the top surface of a
a bullet of mass m0 is fired horizontally with a velocity v0 into the slender bar of a pendulum of mass m and length l
water flows with a velocity of 3 ms in a rectangular channel 3 m wide at a depth of 3 m. what is the change in depth
the presence of raindrops in the air during a heavy rainstorm increases the average density of the air-water mixture.
a kitchen contains a standard refrigerator and a window air conditioner. the refrigerator operates at steady state
steam enters an adiabatic turbine at 20 mpa and 600?c state 1. at an intermediate stage 20 of the inlet steam is bled
a computer chip which contains 25 g of copper 55 g plastic cp 0.96 kjkg-k and 55 g of silicon cp 0.70 kjkg-k. the
a distillation column with a total condenser and a partial reboiler is separating two feeds. the first feed is a
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