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A thermo pane window consists of two glass panes, each 0.50 centimeter thick, with a 1 centimeter thick sealed layer of air in between. (Use 0.8 J/s•m•°C for the thermal conductivity of glass and 0.0234 J/s•m•°C for the thermal conductivity of air to answer the following.)
(a) If the inside surface temperature is 23.2°C and the outside surface temperature is 0.0°C, obtain the rate of energy transfer through 1.95 m2 of the window.
____________W
(b) Compare your answer to (a) with the rate of energy transfer through 1.95 m2 of a single 1.0-cm-thick pane of glass. Disregard surface air layers.
A movie camera with a (single) lens of focal length 90 mm takes a picture of a person standing 21 m away. If the person is 180 cm tall, what is the height of the image in millimeters
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