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Liquid helium is stored at its boiling point (4.2 K) in a spherical can that is separated by an evacuated region of space from a surrounding shield that is maintained at the temperature of liquid nitrogen (77 K). If the can is 57 cm in diameter and is blackened on the outside so that it acts as a blackbody emitter, how much helium boils away per hour?
A cell phone sends and receives electromagnetic waves in the microwave frequency range. Explain the physics of how an oscillator creates these waves
The summit of a mountain, 2700m above base camp, is gauged on a map to be 4580m horizontally from the camp in a direction 30.4? West of north. Choose the x axis east, y axis north, and z axis up. What are the components of the displacement vector fro..
A 47-ohm-resistor can dissipate up to 0.25 Watt of power without burning up. Find the smallest number of such resistors that can be connected in series
Determine the magnitude of the E→ field at a point 3.0 cm directly above the negative charge? Determine the direction of the E→ field at a point 3.0 cm directly above the negative charge? In terms of θ.
A worker is to paint the walls of a square room 8.00 fthigh and 12.0 ft along each side. What surface area in squaremeters must she cover
On an unknown planet with radius 1000km a future astronaut drops a rock from his hand 2m off the ground. The rock takes 2s to reach the ground. What speed did the cannon launch the ball
a find the change in classiclal momentumof an electron that accelerates from 0.900c to 0.940c neglecting relativistic
A certain conductor has 6.20 10^28 free electrons per cubic meter, a cross-sectional area of 4.00 10-6 m2, Find the drift speed of the electrons in the conductor
A 4.85 mol sample of a diatomic ideal gas (gamma = 1.4) expands slowly and adiabatically from a pressure of 4.05 atm and a volume of 13.5 L to a final volume of 34.5 L.
Two narrow slits are illuminated by a laser with a wavelength of 593 nm. Calculate the distance between the two slits
a point moves in the plane so that its tangential acceleration w a and its normal acceleration wn bt4 where a and b
The bottom of a swimming pool looks to be 1.5 m below the surface. Find the pool's actual depth
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