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1. Write the one-dimensional heat equation that could be used to determine the temperature in
(a) a flat circular disk with the flat surfaces insulated and
(b) a sphere with initial temperature a function of r only.
2. Determine the steady-state temperature distribution in
(a) a flat circular disk with sides held at 100?C with the flat surfaces insulated and
(b) a sphere with the outer surface held at 100?C
A cylinder with a diameter of 7 cm and a height of 20 cm is filled with an unknown fluid.
Derive a relationship for the efficiency of a parabolic collector with a receiver/absorber tube corresponding to the reference case in Figure 8.18 as a function of insolation and temperature difference between the collector surface and ambient.
a water kettle has 1 kg of saturated liquid water at p0 . it is on an electric stove that heats it from a hot surface
If the machine is being operated at a speed of 1710 rpm and the frequency of the fundamental component of the applied voltages is 60 Hz, plot the torque versus duty cycle as the duty-cycle d is varied from 0 to 5.
A 1.5-kg specimen of a 88wt% Pb-12wt% Sn alloy (Animated Figure 9.8) is heated to 220°C; at this temperature it is entirely an alpha-phase solid solution. The alloy is to be melted to the extent that 50% of the specimen is liquid, the remainder being..
Consider the electrical heater of Problem 7.49. If the blower were to malfunction, terminating airflow while the heater continued to operate at 1000 W/m, what tem- perature would the heater assume?
Sketch two alternative alignments. Choose one alignment for your design. Justify. Locate your alignment considering both vertical and horizontal controls. Coordinate both horizontal and vertical alignments.
a timber beam is to be selected to sustain a maximum transverse shear of vmax 50 kn without exceeding an allowable
briefly explain why porosity decreases the thermal conductivity of ceramic and polymeric materials rendering them more
For the case of a guided support at A (figure part (a)), what is the critical load Qcr (In other words, at what ? load Qcr does the system collapse because of Euler buckling of the column DC?
if the bar has clockwise angular velocity of 10 rad/s and Va= 20m/s what are coordinates of instantaneous center of the bar, and what is the value of Vb?
A refrigeration unit operating on R-134a is used to maintain a freezer at -15°C. The refrigeration unit operates at a suction pressure of 140kPa and a discharge pressure of 900kPa. The condenser of the refrigeration unit is cooled by a water cooled h..
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