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A plastic coating is applied to wood panels by first depositing molten polymer on a panel and then cooling the surface of the polymer by subjecting it to air flow at 25°C. As first approximations, the heat of reaction associated with solidification of the polymer may be neglected and the polymer/wood interface may be assumed to be adiabatic.
If the thickness of the coating is L = 2 mm and it has an initial uniform temperature of Ti = 200°C, how long will it take for the surface to achieve a safe-to-touch temperature of 42°C if the convection coefficient is h = 200 W/m2 · K? What is the corresponding value of the interface temperature? The thermal conductivity and diffusivity of the plastic are k = 0.25 W/m · K and a = 1.20 X 10-7 m2/s, respectively.
Teresa measures the distance that a traverse system moves an object for a given computer-controlled input pulse. She makes 100 readings, and the mean value is 6.832 m with a sample standard deviation of 1.0 cm. The errors in the measurements are assu..
Calculate a standard deviation for the result in part (d).
the fatigue data for a brass alloy are given as followsstress amplitude mpa -----------------cycles to failure310
As a software project manager in a company that specializes in the development of software for the offshore oil industry, you have been given the task of discovering the factors that affect the maintainability of the systems developed by your comp..
A hollow spherical shape (internal radius Ri = 2.7cm; external radius Re = 3cm) that will be submerged in a larger container filled with water to a height of 20cm. Determine the magnitude and direction of the applied force necessary to maintain the t..
What is the probability that the strength is less than or equal to 5,000 psi. What is the probability that the strength is greater than 2,500 psi
suppose you have a 50 kg block of steel. if you have 103 exajoules at your disposal how many times could you push this
a wing generates a lift l when moving through sea-level air with a velocity u. how fast must the wing move through the
An L shaped edge dislocation ABC in a crystal is shown in Figure below. The stresses acting on the crystal are also shown. Determine which dislocation segment moves and which dislocation segment does not move. What will be the shape of the crystal..
the waste gas from a process of 1000 gmolhr of co at 473 degrees kelvin is burned at 1atm pressure in a furnace using
it is desired to design a cooler in which the tubes are 4 mm diameter to cool 10000 kg of milk per hour from 20c-3c.
suppose the rate of growth of a bacterial population n cellsliter is described by dndt kn -1000. the terms represent
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