This famous image from the Hubble Space Telescope shows what is sometimes called the "pillars of creation." Which of the following best describes what it shows?
A) The pillars are clouds of gas and dust in which many new stars are forming; the edges of the pillars are sculpted by ultraviolet radiation from stars outside the pillars.
B) Each of the pillars is a cloud of gas that will give birth to a single star, which will emerge from the top of its pillar.
C) There is a hot, young star at the top of each pillar that is shooting a jet of gas that forms the pillar below the star.
D) There is a single star outside the frame at the bottom, and the pillars are clouds of accreting particles that will form planets orbiting the star.
A) The pillars are clouds of gas and dust in which many new stars are forming; the edges of the pillars are sculpted by ultraviolet radiation from stars outside the pillars.
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A box is dropped onto a conveyor belt moving at 2 m/s. If the coefficient of friction between the box and the belt is 0.3, how long before the box moves without slipping?
Two thermometers are calibrated, one in degrees Celsius and the other in degrees Fahrenheit. At what temperature (in kelvins) do their readings measure the same temperature?
a. 218.15 b. 233.15 c. 273.15 d. 40.15 e. 0
In the context of the unified model of active galactic nuclei (AGN), you see jets of gas and radiation emerging perpendicular to the accretion disk of an AGN and coming straight at you if:
A) the accretion disk is tilted at an angle of 30 degrees to your line of sight. B) you look directly into the central cavity around the black hole. C) you view the accretion disk from its edge. D) the accretion disk is tilted at an angle of 60 degrees to your line of sight.
What is the primary topic of study in quantum mechanics?
A) subatomic particles and the forces with which they interact B) the role played by atoms in astronomy C) the mechanical movements of the heavens D) the role of relativity in astronomy