Bricks have been made for centuries by baking them in direct sunlight. Determine the time required to complete the baking if water is driven off at 95ºF and it requires 7000 Btu for each brick. Each brick is 4 inches by 6 inches by 8 inches and the surface emissivity is 0.4.
What will be an ideal response?
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A(n) ____________________ telescope has an objective that is a lens
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Latent Heats: Solar houses use a variety of energy storage devices to retain the heat absorbed during the day so that it can be released during the night. Suppose that you were to use a device of this kind to produce steam at 100°C during the day, and then allow the steam to cool to 0°C and freeze during the night. How many kilograms of water would be needed to store 20.0 kWh of energy in this way? The latent heat of vaporization of water is 22.6 × 105 J/kg, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat capacity of water is 4186 J/kg ? K.
A. 12.4 kg B. 23.9 kg C. 35.7 kg D. 42.6 kg E. 54.2 kg
When the intensity of light is increased in a photoelectric effect experiment, the energy of the emitted electrons __________
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Which of the following is (are) invariant(s)?
A. mass B. momentum C. energy D. the speed of light E. mass and the speed of light