If the collapsing star is over 25 solar masses, the core may form ________ in a hypernova event
A) a gamma-ray burster
B) a millisencond pulsar
C) an X-rays burster
D) a pulsar
E) a black hole
E
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Relative Velocity: Your motorboat can move at 30 km/h in still water. What is the minimum time it will take you to move 12 km downstream in a river flowing at 6.0 km/h?
A. 20 min B. 22 min C. 24 min D. 30 min
This figure summarizes the geological histories of the terrestrial worlds. Based on this figure, what can you conclude?
A) The most important factor in a planet's geological history is its size. B) The most important factor in a planet's geological history is its distance from the Sun. C) We can trace almost all the key properties of a planet's geology back to the number of impacts it suffered during the heavy bombardment. D) Earth is the only planet in the inner solar system capable of harboring life.
What is meant by draft?
What will be an ideal response?
A 30 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the third mode?
A. 48 cm B. 36 cm C. 30 cm D. 24 cm E. 12 cm