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A spherical workpiece of pure copper with a diameter of 15 mm and an emissivity of 0.5 is suspended in a large furnace with walls at a uniform temperature of 600°C. Air flows over the workpiece at a temperature of 900°C and a velocity of 7.5 m/s.
(a) Determine the steady-state temperature of the workpiece.
(b) Estimate the time required for the workpiece to come within 5°C of the steady-state temperature if it is at an initial, uniform temperature of 25°C.
(c) To decrease the time to heat the workpiece, the air velocity is doubled, with all other conditions remaining the same.
Determine the steady-state temperature of the workpiece and the time required for it to come within 5°C of this value. Plot on the same graph the workpiece temperature histories for the two velocities.
Block A has a mass of 5 kg and is placed on the smooth triangular block B having a mass of 30 kg. If the system is released from rest, determine the distance B moves from point O when A reaches the bottom. Neglect the size of blockA.
Derive the steady-state voltage equation for the synchronous machine (5.9-19) . In the derivation, use the stator voltage equations expressed in the arbitrary reference frame.
An 80-lb weight falls through 5 ft and is then caught at the end of a wire rope 90 ft long having a cross-sectional area of 0.5 in.2. Find the maximum dynamic stress in the rope, assuming E = 15 × 106 psi.
Compare the location of the metacenter with the center of gravity to evaluate stability.
If an available pump is the 240-mmdiameter radial-flow machine of Fig. 12.6, how many pumps in series are required to provide the most efficient operation? Find the required power.
For this flow field, what is the magnitude of the average velocity of the fluid crossing the surface OA of Fig. P6.23? Assume that the velocities are in feet per second when x and y are in feet
the flight path of a jet aircraft as it takes off is defined by the parametric equations x 1.25 t2 and y 0.03 t3
the nozzle exit flow angle and the rotor inlet passage width diameter ratio, b2/D2.
Deterine the approximate values of bar force in the members of the truss - Diagonal bars are slender and can carry only tension.
Refrigerant 134a enters a 28-cm diameter pipe steadily at 200 kPa and 20C with a velocity of 5 m/s. The refrigerant gains heat as it flows through the pipe and leaves the pipe at 180 kPa and 40 C.
Estimating fractions of a cost, Estimate what fraction of the price of a pocket calculator is required to cover the cost of developing the product.
A series of two turbines and a heat exchanger are used to obtain shaft work from steam in a steady state process. The steam enters at 10bar and 250C, and exits the turbine at 3 bars. In the heat exchanger, the steam is heated back up to 250C, while t..
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