Quiz-2 (Unsolved)

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College Algebra & Trignometry

(1st Edition)

Book - Edition 1st Edition

Author(s) - Miller, Gerken

ISBN - 9780078035623

Publisher - McGraw Hill

Subject - Math

Quiz Tittle Quiz Translation View
Quiz-2 (Unsolved)Two identical hot spheres made of stainless steel are being cooled as following: (a) Sphere 1 is being cooled by a fan (b) Sphere 2 is allowed to cool naturally If the Biot number Bi=hL/k; which of the spheres is more likely to be considered as a lumped system. ,Two identical hot spheres made of stainless steel are being cooled as following: (a) Sphere 1 is dropped in a large container filled with water (b) Sphere 2 is allowed to cool naturally in the open air If the Biot number Bi=hL/k; which of the spheres is more likely to be considered as a lumped system.,Consider that the following expression is used to calculate the temperature of the object at any given time:,The following differential equation represents a one-dimensional transient heat transfer through a flat slab in the Cartesian coordinate system.where symbols have their usual meaning. If one of the planes (at x=L) is left open to cool naturally in the environment, what boundary condition will be applied?,Consider a hot baked pizza coming out of an oven. If the pizza temperature drops by 5°C during the first minute, by how much the temperature will drop during the second minute. You can treat pizza as a lumped system, where temperature drop is given by the following general equation:,While using the Heisler charts for a cylinder at time t = 10 sec and at a radial location of r/r0=0.6 Calculate the temperature at r/r0=0.6 at t= 10 sec; if T ∞ =20°C; and Ti= 58 C ,The Fourier number, Fo=αt/(Lc ) 2 and Biot number Bi = hLc /k are used to determine whether Heisler charts or Lumped analysis are applicable on a given system. Consider that a particular time t=10 sec, Fo=4 units, and Bi= 5 units. Which of the following will be true at t=20 sec:,While using the Heisler charts for a cylinder at time t = 10 sec and at a radial location of r/r0=0.6 If the parameters associated with the cylinder are ρ =2700 kg/m3 and C p=900 J/kg.C and volume of 1 m long cylinder = 0.1 m3 Calculate the maximum possible heat transfer from the cylinder to the environment per unit length of the cylinder if T ∞ =20°C; and T i= 99 C