Why do blue stragglers show up in globular clusters?
What will be an ideal response?
These stars appear younger than their neighbors because they result from mergers of stars in the close conditions in dense globular clusters.
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Meteor shower debris is believed to come from:
A) the asteroid belt when Mars deflects it toward us annually. B) the core of a differentiated type M asteroid, now broken up. C) the crust of a differentiated type C asteroid, now broken up. D) the disintegration of a short period comet over many returns to the Sun. E) deep space, far beyond the solar system, deflected by the gravity of another star.
A ball rolls over the edge of a platform with only a horizontal velocity. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20 m
What is the horizontal velocity of the ball just before it touches the ground? Neglect air resistance. A) 35 m/s B) 9.8 m/s C) 20 m/s D) 4.9 m/s E) 70 m/s
In order for the cosmic microwave background to show hydrogen absorption lines at the redshift corresponding to the universe's age of 380,000 years, what condition would have been necessary?
A) There would have needed to be even warmer hydrogen clouds (which would contradict the observation of a uniform temperature in all directions). B) There would have needed to be cooler hydrogen clouds (which would contradict the observation of a uniform temperature in all directions). C) There would have needed to be ionized hydrogen (which would contradict the idea that the CMB originates at the time the universe cooled enough for protons and electrons to combine, making neutral atoms).
There is no such thing as a dc electric motor
Indicate whether the statement is true or false