One star has a surface temperature of 6000 K and another has a surface temperature of 7000 K. If the two stars have the same absolute luminosity, which star has the largest radius?
A)
the star at 6000 K
B)
the star at 7000 K
C)
The two stars have the same radius.
D)
Not enough information is given to determine.
A
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Fusion processes in stellar cores involving heavy elements ____
a. generate more energy per atom than fusion of lighter elements b. generate less total energy because less atoms are available c. generate energy for longer periods of time for heavier elements d. occur in shells further and further from the center of the core e. occur in larger and larger volumes of the core
Energy and Momentum: An object initially at rest suddenly explodes in two fragments of masses 2.6 kg and 3.3 kg that move in opposite directions. If the speed of the first fragment is 3.6 m/s, find the internal energy of the explosion.
A. 30 J B. 30 kJ C. 38 J D. 38 kJ
The observed temperature difference between the northern and southern hemispheres of Uranus:
A) is dozens of Kelvins. B) is hundreds of Kelvins. C) varies greatly. D) is about 10 Kelvin.
What is the acceleration of a scooter that maintains a constant velocity of 15 m/s for 10 s?
A) 0 m/s2 B) 0.15 m/s2 C) 1.5 m/s2 D) 15 m/s2