Which event marks the beginning of a supernova?
A) the sudden collapse of an iron core into a compact ball of neutrons
B) the onset of helium fusion after a helium flash
C) the beginning of neon fusion in an extremely massive star
D) the sudden initiation of the CNO cycle
A) the sudden collapse of an iron core into a compact ball of neutrons
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A laser is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is 1.5 m/s2 and there is no atmosphere. What is the maximum height reached by the laser?
A) 8.0 m B) 18 m C) 48 m D) 144 m
Answer the following statement(s) true (T) or false (F)
A long-wavelength photon, because it is larger, carries more total energy than a short-wavelength photon.
A constant force of 15 N in the negative y direction acts on a particle as it moves from the origin to the point (3i+3j-1k)m. How much work is done by the given force during this displacement?
What will be an ideal response?
The star Wolf 359 is 7.7 light years away. What is that distance in kilometers?
a. 7.7 x 10^8 km b. 14 x 10^13 km c. 0.78 x 10^8 km d. 7.28 x 10^13 km e. 7.28 x 10^12 km