The Schwartzschild radius for a 12 solar mass star is:
A) 4 km.
B) 15 km.
C) 36 km.
D) 100 km.
E) 3000 km.
C
You might also like to view...
Based on the evidence that atmospheric carbon dioxide is a cause of planetary warming, what aspect of the graphs should most concern us?
A. The carbon dioxide concentration today is significantly higher than at any time in the past 800,000 years and is rapidly rising. B. Earth's past temperature rises and falls naturally. C. Earth's past carbon dioxide concentration rises and falls naturally.
Consider two copper wires. One has twice the length of the other. How do the resistivities of these two wires compare?
A) The longer wire has twice the resistivity of the shorter wire. B) Both wires have the same resistivity. C) The longer wire has four times the resistivity of the shorter wire. D) The shorter wire has twice the resistivity of the longer wire.
A charged particle (mass = 4.0 ?g, charge = 5.0 ?C) moves in a region where the only force on it is magnetic. What is the magnitude of the acceleration of the particle at a point where the speed of the particle is 5.0 km/s, the magnitude of the magnetic field is 8.0 mT, and the angle between the direction of the magnetic field and the velocity of the particle is 60°?
A. 39 km/s2 B. 43 km/s2 C. 48 km/s2 D. 52 km/s2 E. 25 km/s2
A flat circular loop of wire is in a uniform magnetic field of 0.30 T. The diameter of the loop is 1.0 m, and a 2.0-A current flows in it
What is the magnitude of the magnetic torque on the loop when the plane of the loop is parallel to the magnetic field? A) 0.47 N ? m B) 0.52 N ? m C) 0.41 N ? m D) 0.00 N ? m