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Physics, 15.10.2020 07:01 rachanachannagiri
Annealing is a process by which steel is reheated and then cooled to make it less brittle. Consider the reheat stage for a 100-mm-thick steel plate ( 7830 kg/m3 , F 550 J/kg K, N 48 W/m K), which is initially at a uniform temperature of 7L 200C and is to be heated to a minimum temperature of 550C. Heating is effected in a gas-fired furnace, where products of combustion at 7 800C maintain a convection coefficient of K 250 W/m2 K on both surfaces of the plate. How long should the plate be left in the furnace?
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Physics, 22.06.2019 10:30, arigar
Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.
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Annealing is a process by which steel is reheated and then cooled to make it less brittle. Consider...
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