In the Bohr model of the hydrogen atom, the electron circles the proton at a distance of 0.529 × 10^?10 m. Find the potential at the position of the electron
27.2 Volts
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What is the product of 12.56 and 2.12?
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A thin-wall cylindrical vessel (1 m in diameter) is filled to a depth of 1.2 m with water at an initial temperature of 15°C. The water is well stirred by a mechanical agitator. Estimate the time required to heat the water to 50°C if the tank is suddenly immersed into oil at 105°C. The overall heat transfer coefficient between the oil and the water is 284 W/(m2 K), and the effective heat transfer surface area is 4.2 m2 .
GIVEN
• A thin wall cylindrical vessel filled with water is suddenly immersed into oil
• Diameter of vessel (D) = 1 m
• Depth of water is vessel = 1.2 m
• Initial temperature (To) = 15°C
• Final temperature (Tf) = 50°C
• Oil temperature (T?) = 105°C
• The overall heat transfer coefficient between the oil and water ( )h = 284 W/(m2 K)
• The effective heat transfer surface area (A) = 4.2 m2 FIND
• The time required to heat the water to 50°C
ASSUMPTIONS
• The thermal capacitance of the cylindrical vessel is negligible
• The temperature of the water is uniform
• The oil temperature remains constant
SKETCH
