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The cake batter has an average mass of 0.5 kg (between before and after baking) and the pyrex cake pan has a mass of 0.9 kg. The cake and the pan both start at a room temperature of 25 C and the oven temperature is held at 180C. If the average specific heat of the cake is 4.6 kJ/kg-K and the average specific heat of the pyrex cake pan is 0.835 kJ/kg-K, determine the amount of heat that needs to be added to bring the cake and the pan to the over temperature (when it is fully baked). If the cake takes 20 minutes to bake, what is the average power transferred during that time.
there are supplied to a nozzle 2400 lbhr of steam at an absolute pressure of 200 psia. at the entrance v1 6000 ftmin
water enters a turbine at 500oc and 6 mpa and leaves at 10 kpa what is the work output per unit mass if the turbine is
A circular shaft is subjected to a torque Ta and a bending moment Ma. Assuming that the diameter of the shaft is d, determine the expressions for the principal stresses and maximum shear stress in terms of Ma, Ta and d.
the 2 Mg car increases its speed uniformly from rest to 25 m/s in 30s up the inclined road. determine the maximum power that must be supplied by the engine, which operates with an efficiency of 0.8. also, find the average power supplied by the eng..
The maximum flow past a circular cylinder is 2 X the Up stream velocity. The max velocity occurs at the center line of the top of the cylinder.
a cycle using helium in a piston-cylinder device starts at t1 300 k and p1 0.2 mpa. the helium is then compressed
water vapor at 6 mpa 600degc enters a turbine operating at steady state and expands to 10 kpa. the mass flow rate is 2
A 0.4 W cylindrical electronic component with a diameter of 0.3 cm and length 1.8 cm is mounted horizontally on a circuit board. To cool the component air is flowing across the board at a velocity of 150 m/min. If the air temperature is T∞= 45°C, ..
Hollow shaft transmitting power with shear limits. Design a hollow steel shaft to transmit 300 hp at 75 rpm without exceeding a shear tress of 8000 psi. Use 1.2:1 as the ratio of the outside diameter to the inside diameter.
a stream of methanol vapor is used to chill a countercurrently flowing saturated steam in an adiabatic heat exchanger.
heat is generated uniformly inside a 20-mm thick plane wall at a rate of 20000 wm3. the thermal conductivity of the
water is flowing through a large circular conduit with a velocity profile given by the equation v91-r216 ft per second.
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