Physics, 06.10.2019 11:00 kaiyerecampbell95
To defrost ice accumulated on the outer surface of an automobile windshield, warm air is blown over the inner surface of the windshield. consider an automobile windshield with thickness of 5 mm and thermal conductivity of 1.4 w/m·k. the outside ambient temperature is 210°c and the convection heat transfer coefficient is 200 w/m2·k, while the ambient temperature inside the automobile is 25°c. determine the value of the convection heat transfer coefficient for the warm air blowing over the inner surface of the windshield necessary to cause the accumulated ice to begin melting.
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Acarpenter is driving a 15.0-g steel nail into a board. his 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. half of the kinetic energy of the hammer is transformed into heat in the nail and does not flow out of the nail. what is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? the specific heat of steel is 448 j/kg ∙ k. a) 2.7 k b) 1.8 k c) 7.7 k d) 8.1 k e) 3.6 k
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To defrost ice accumulated on the outer surface of an automobile windshield, warm air is blown over...
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