How does Rigel, a bluish star, surface temperature compare to Betelgeuse, a reddish star.
A. Rigel's surface temperature is less than Betelgeuse's.
B. Rigel's surface temperature is greater than Betelgeuse's.
C. They have the same surface temperature because they are both members of the constellation Orion.
D. It is impossible to say without knowledge of the sizes of the stars.
Answer: B
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A Type Ia supernova is believed to occur when
a. the core of a massive star collapses. b. hydrogen detonation occurs. c. a white dwarf exceeds the Chandrasekhar limit. d. the cores of massive stars collapse. e. neutrinos in a massive star become degenerate and form a shock wave that explodes the star.
In order to understand what the universe was like before 10-44 seconds we need
A) a way to measure more distant Type Ia supernovae B) to understand how helium can be made from hydrogen in stars C) to develop Quantum Field Theory D) to harness the power of black holes E) a way to combine the theories of General Relativity and Quantum Mechanics
A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 atm= 1.01 × 105 N/m2.
A. 1.0 atm B. 4.2 atm C. 7.2 atm D. 9.7 atm E. 8.2 atm
A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic field. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N × m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field?
a. 0.37 T b. 1.6 T c. 0.50 T d. 1.2 T e. 2.5 T