The Sgr A* black hole may contain three million solar masses
Indicate whether the statement is true or false
TRUE
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A 5 cm diameter exhaust pipe at 700 K has an opaque outer surface and emissivity of 0.9. A galvanized gray sheet iron tube of 15 cm diameter is placed concentrically around the pipe. If the tube is to have a temperature of no more than 350 K, determine the maximum heat transfer that can be dissipated per unit length of the pipes.
What will be an ideal response?
The period-luminosity relation for Cepheid variables was discovered in 1908 by
A) William Herschel. B) Henrietta Leavitt. C) Harlow Shapley. D) Heber Curtiss. E) Edwin Hubble.
A hydrogen atom is in the 6h state. Determine the principal quantum number
A) 0 B) 3 C) 5 D) 6 E) 7
When a body moves in a straight line with increasing speed, the net force on it must be increasing
Indicate whether the statement is true or false