Whether or NOT we see radio lobes from radio galaxies depends on their ________ relative to our line of sight
Fill in the blank(s) with correct word
orientation
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This x-ray image shows a loop of hot gas above the surface of the Sun. Suppose we took another photo looking at the same place 1 hour later. What would we see?
A) The loop would look about the same as it does in this photo. B) The loop would have shot much higher up above the Sun's surface. C) The loop would have collapsed back down, so we would not see it anymore. D) The loop would have turned blue as the gas became hotter.
Optical telescopes are usually used only at night, but radio telescopes can be used day or night
Indicate whether the statement is true or false
An ideal Carnot engine is operated as a thermodynamic pump to heat a room in the winter
The thermodynamic pump delivers thermal energy to the room at the rate of 47 kJ per second and maintains the room at a temperature of 293 K when the outside temperature is 237 K. The power requirement to run the thermodynamic pump under these operating conditions is closest to A) 9000 W. B) 7100 W. C) 20,000 W. D) 15,000 W. E) 11,000 W.
A spherical interplanetary probe with 30-cm diameter contains electronic equipment that dissipates 100 W. If the probe surface has emissivity of 0.8, what is its surface temperature in outer space? State your assumptions in calculation.
GIVEN Interplanetary probe with 30-cm diameter, radius(r) =0.15 m Dissipation qr=100 W and emissivity (?)=0.8 • FIND Surface temperature in outer space. ASSUMPTIONS • Steady state condition. • Heat transfer only by radiation. • Temperatue of outer space is considered 0 Kelvin. (T2)=0 K PROPERTIES AND CONSTANTS The Stefan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)