The 400" Keck reflector can see objects 100 times fainter than the 40" Yerkes lens
Indicate whether the statement is true or false
TRUE
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Which of the following telescopes is best suited for studying the hottest intergalactic gas (10 million K) in a cluster of galaxies?
Which of the following telescopes is best suited for studying the hottest intergalactic gas (10 million K) in a cluster of galaxies?
Which of the following is a feature of our solar system that should be predicted by a successful theory of solar system formation?
A) the age of our solar system B) the fact that all the planets in our solar system orbit the Sun in the same direction C) the fact that there are exactly four terrestrial planets and exactly four jovian planets D) the fact that Earth has a 23-1/2° axis tilt E) the fact that Jupiter has the most known moons in the solar system
The primary evidence that has led astronomers to conclude that the expansion of the universe is accelerating comes from
A) observations of white dwarf supernovae. B) observations of the speeds of individual galaxies in clusters. C) measurements of the rotation curve for the universe. D) measurements of how galaxy speeds away from the Milky Way have increased during the past century.
A person on a sled coasts down a hill and then goes over a slight rise with speed 2.7 m/s. The top of this rise can be modeled as a circle of radius 4.1 m
The sled and occupant have a combined mass of 110 kg. If the coefficient of kinetic friction between the snow and the sled is 0.10, what friction force is exerted on the sled by the snow as the sled goes over the top of the rise? What will be an ideal response?