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Liquid helium is stored at its boiling-point temperature of 4.2 Kin 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 67 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. Find what mass of liquid helium boils away through a venting valve in 1 hour?
question1consider mass and a frictionless ramp. the mass is pushednbspupward with some initial velocity. since of
Calculate the magnitude of the gravitational force exerted on a 429-kg satellite that is a distance of 2.91 times earth radii from the center of the earth. What is the magnitude of the earth's acceleration
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A vessel which contains an ice-water mixture at 0C is in thermal contact with a water-steam mixture at 100 C. how many grams of ice melts
If two people were 15km apart, how long would it take light to make the round trip? How does this time compare with reaction times of 0.2s
A closely wound rectangular coil of 95.0 turns has dimensions of 21.0cm by 48.0cm. What is the average emf induced in the coil
imagine that a cars x-acceleration during a certain time period is given by the function axt-bt. if the cars
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The deflection plates in an oscilloscope are 10 cm by 2 cm with a gap distance of 1 mm. A 100 volt potential difference is suddenly applied to the initially uncharged plates through a 950 ohm resistor in series with the deflection plates.
When 195 g of a substance is heated to 335°C and then plunged into a 100 g aluminum calorimeter cup containing 134 g of water at 13.0°C, What is the specific heat of the substance
q1. the magnitude of the gravitational force between two sumo wrestlers just before they collide r 0.025 m is 2.77
an electron is projected with an initial speed of 3.9 x105 ms directly toward a proton that is fixed in place. if the
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