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A white dwarf is the cooling remnant of a star similar to our Sun. A particular white dwarf has a temperature of 16155 K and a radius of 7.5×106m. White dwarfs are excellent radiators with an emissivity very close to 1 (so close that you should assume it is 1.0). The white dwarf is situated in the vacuum of space with a temperature of 2.73K. What is the rate at which the white dwarf radiates energy into space?
The position of a squirrel running in a park is given by : r=[(00.280 m/s)t+(0.0360 m/s^2)t^2]i+(0.0190 m/s^3)t^3j. At 4.20 , how far is the squirrel from its initial position
The initial length of a rod is (Lo). The length increases by 0.05%. To find the new length (L), you must multiply Lo by what, Calculate the temperature coefficient of linear expansion for this bar
in a haynes- shockley experiment the distance between the cross r and a is d0.1m t0.25 milliseconds if the carriers are
A man's face is 30 cm in front of a concave (converging) spherical shavin mirror. If the image is upright and 1.5 times as large as his face. What is the image distance? What is the focal length of the minor?
A beam of light is incident from air onto a flat piece ofpolystyrene at an angle of 52^{\circ} relative to a normal to the surface. What angle does the refracted ray make withthe plane of the surface?
Antennas for radio transmission and reception are particularly effective if they're about a half-wavelength long. What's the appropriate length for an FM antenna
Calculate the adiabatic flame temperature attained when methane at 298k, is combusted (a) with oxygen in the molar ratio air/CH4 = 9.524. Assume that CO2 and H2O are the products of the combustion. The adiabatic flame temperature is that temperature ..
A bucket of mass 2.00 kilogram is whirled in a vertical circle of radius 1.10 meter. Determine how fast must the bucket move at the top of the circle so that the rope does not go slack
Determine the work done on a dog by the leash if the person remains stationary, and the dog bounds off, stretching the X-R Leash from x= 0 to x=x1
A uniform square plate 11 cm on a side has a circular hole of diameter 8.0 cm cut out of it, as shown in the figure. The hole is centered left-to-right, but touches the edge on the bottom of the plate. Where is the center of mass of the resulting ..
you have book a 6 kg which sits on top of book b 15 kg which sits on top of a table 30 kg.a. draw a free body diagram
A 5 kilogram mass attached to a horizontal spring is pulled from its equilibrium position by 2 meter and let go. find what is the maximum velocity of the mass
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