Uranus's orbital period is 84 years. How far is Uranus from the Sun?
What will be an ideal response?
19 AU
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A radiant heater element is made so that it is concentric about a copper tube, as shown in the figure. The heater is 1 cm thick, 10 cm OD, and 8 cm ID. The copper tubing is 4 cm in diameter, has an emissivity of 0.05, and is at 200ºC. The heater tubing has an emissivity of 0.9 on the inside, and 0.04 on the outside. The heater is at 1000ºC. If the surroundings are taken as a black body at 300 K, determine the power per unit length of the heater needed for steady state operation.
In astronomical usage, all atoms heavier than helium are referred to as__________
A) metals B) Population I atoms C) halos D) dark matter
Einstein rejected the classical idea that space and time are
A) two parts of a whole. B) connected to each other. C) independent of each other.
A stationary electric charge produces a magnetic field around it
Indicate whether the statement is true or false