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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A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion The displacement vector from the equilibrium position points up
Indicate whether the statement is true or false
Jupiter, Saturn, Uranus and Neptune are only located at a distance of 1 AU or less from the Sun
a. True b. False Indicate whether the statement is true or false
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
What is the product of 12.56 and 2.12?
A) 27 B) 26.6 C) 26.23 D) 26.627 E) 26.6270