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The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm) is - 196°C. Therefore, nitrogen is commonly used in low temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere remains constant at 196°C until the liquid nitrogen in the tank is depleted. Any heat transfer to the tank results in the evaporation of some liquid nitrogen, which has a heat of vaporization of - 198 kJ/kg and a density of 810 kg/m3 at 1 atm. Consider a 4-m-diameter spherical tank initially filled with liquid nitrogen at 1 atm and - 196°C. The tank is exposed to 20°C ambient air with a heat transfer coefficient of 25 W/m2 · °C. The temperature of the thin-shelled spherical tank is observed to be almost the same as the temperature of the nitrogen inside. Disregarding any radiation heat exchange, determine the rate of evaporation of the liquid nitrogen in the tank as a result of the heat transfer from the ambient air.
The Earth is 1.49 ? 1011 meters from the sun. If the solar radiation at the top of the Earth's atmosphere is 1 340 W/m2, what is the total power output of the sun?
Calculate the deBroglie wavelength of electrons that have been accelerated by 50,000 Volts (Remember the relation between energy and momentum). The answer is 5.486*10^-12 meters, but I'm not sure how to get it.
A hill that has 18.6 percent grade is one that rises 18.6 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such a hill inclined above the horizontal?
A 60.0 kg uniform solid cylinder has a radius of 0.443 m. If the cylinder accelerates at 5.90 ×10-2 rad/s2 as it rotates about an axis through its center, how large is the torque acting on the cylinder?
how many days would be required to move one of the charges.
a worker pushes horizontally on a 35 kg crate with a force of magnitude 110 n. the coefficient of static friction
A uniform disk of radius 0.46 m is mounted on a frictionless, horizontal axis. A light cord wrapped around the disk supports a 0.58 kg object. When free from rest the object falls with a downward acceleration of 4.1 m/s squared.
a 0.452 kg block of ice is compressed a distance of 0.13 m against a spring with a spring constant of 378 nm and is
A 12.9 kΩ resistor and a capacitor are connected in series andthen a 12.0 V potential difference is suddenly applied across them. Calculate the time constant of the circuit
A planet has a mass of 4.2 x 1024 kg and travels in a nearly circular orbit around a star as shown. What is Δp→, the change in the momentum of the planet between locations A and B?
Draw arrows at points 1, 2, and 3 to show the direction of the electric field at those points. (The points are inside the wire.) Rank in order, from largest to smallest, the currents I1,I2, and I3 at points 1 to 3.
Consider a straight wire with a radius A, carrying a current I, Use Ampere's law to calculate the magnetic field around the wire as a function of r, the distance from the center
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