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Liquid helium is stored at its boiling point temperature of 4.2K in a spherical container (r=0.30 meter). The container is a perfect blackbody radiator. The container is surrounded by a spherical shield whose temperature is 87 K. A vacuum exists in the space between the shield and the container. The latent heat of vaporization for helium is 2.1x104 J/kg. Calculate what mass of liquid helium boils away through a venting valve in 1 hour?
a long thin solenoid has 55 turnscm and carries a current of 0.212 a. the solenoid is filled with iron and the magnetic
a gamma ray of 2.75 mev from 24na undergoes pair production in a lead shield. a how much kinetic energy mev is shared
A chemist must dilute of M aqueous silver nitrate solution until the concentration falls to M . He'll do this by adding distilled water to the solution until it reaches a certain final volume
2.00 ×1020electrons flow through a cross section of a 4.60?mm?diameter iron wire in 6.00s, What is the electron drift speed in um/s
A 68.0-O resistor is connected in series with a 76.0-µF capacitor and a generator having a maximum voltage of 1.20 102 V and operating at 60.0 Hz
If you hold a horizontal metal bar several centimeters above the ground and move it through grass, each leaf of grass bends out of the way. How can it exert enough force on a leaf of grass to shear it off
In a adjustable nozzle for a garden hose, a cylindrical plugis aligned along the axis of the hose and can be inserted into thehose opening. Find the ratio of the plug radius to the inside hose radius
A copper wire of radius a = 0.331 mm has an aluminumjacket of outer radius b = 0.459 mm. There is a currenti = 2.23 A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 x 10-8Ω·m and2.75 x 10-8Ω·m.
A 32 cm long solenoid, 1.8 cm in diameter, is to produce a 0.24 T magnetic field at its center. If the maximum current is 5.7 A, how many turns must the solenoid have
a major leaguer hits a baseball so that it leaves the bat at a speed of 28. ms and at an angle of 36.9 above the
derive the explicit form inx-y coordinates for the potential contribution due to the fourths-derivativetof the octupole
A particle with a charge of 4.10nC is in a uniform electric field E? directed to the left, What work was done by the electric force and What is the magnitude of E
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