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Problem: Consider a cylindrical Dewar with an inner container 0.220m high and 0.090m in diameter used to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09 × 104 J/kg. Surrounding the metal container are walls maintained at the temperature of liquid nitrogen, 77.3 K, with vacuum between the can and the surrounding walls.
Part A: How much helium is lost per hour? The emissivity of the metal walls of the container is 0.200. The only heat transfer between the inner and outer walls is by radiation.
I know the correct answer for above problem but explain how to get this answer! Thanks.
A standing wave interference pattern is set up by radio waves among two metal sheets 3.80 ma part. That is the shortest distance among the plates that will produce a standing wave pattern. What is the fundamental frequency?
the aorta is the main artery from the heart. a typical aorta has an inside diameter of 1.7cm and carries blood at
A concave mirror has a focal length of 60.7 cm. (a) What is its radius of curvature? cm (b) Locate the image when the object distance is 100 cm. (Indicate the side of the mirror with the sign of your answer.) cm (c) Locate the image when the object d..
Early one October you go to a pumpkin patch to select your Halloween pumpkin. Calculate the work you do on the pumpkin as you lift it from the ground
A heat engine has a useful work output of 4.0 kJ and expels 8.0 kJ of exhaust energy in each cycle. what is the engine's thermal efficiency
An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is S = 1.38 109 W/m2. What is the rms value of each of the following fields in the electromagnetic wave emitted by the laser? (a) the electric fie..
A propeller is modeled as five identical uniform rods extending radially from its axis. The length and mass of each rod are 0.793 m and 2.97 kg, what is its rotational kinetic energy
Ceres, the smallest identified dwarf planet in the Solar System, has a radius R = 480 km and an acceleration due to gravity on its surface of magnitude g = 0.27 m/s2. calculate the escape speed from the surface of Ceres
Write your solution on how to start from the time-dependent Schrodinger equation and arrive at the general solution of the wavefunction
When a current flows in an aluminum wire of diameter 3.29 mm, the drift speed of the conduction electrons is 2.85 × 10-4 m/s. What is the electron current in the wire
The rms current in an ac circuit with a resistance of 140 is 0.88 A. What is the average power consumed by this circuit
The head of a rattlesnake can accelerate at 50 m/s^2 in striking a victim. If a car can have the same acceleration, how long would it take for it to reach a speed of 100 km/h from rest.
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