Weight and g: The mass of Pluto is 1.31 × 1022 kg and its radius is 1.15 × 106 m. What is the acceleration of a freely-falling object at the surface of Pluto if it has no atmosphere? (G = 6.67 × 10-11 N ? m2/kg2)
A. 0.661 m/s2
B. 9.81 m/s2
C. 1.62 m/s2
D. 3.72 m/s2
E. 0.140 m/s2
Answer: A
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For an FCC crystal, which of the following x-ray (hkl) diffraction peaks is not present?
(a) (100) (b) (111) (c) (131) (d) (200)
Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?
A) measuring the orbital velocities of galaxies in the cluster B) measuring the temperature of x-ray gas in the intracluster medium C) measuring the amount of distortion caused by gravitational lensing
Which is NOT a critical factor that determines the habitability of a rocky planet?
A) size B) distance from parent star C) presence of a magnetic field D) presence of an atmosphere
The coolest white-dwarf: Surveys have been carried out to identify isolated white-dwarfs throughout the galaxy and its globular clusters
They have been found to span a range of temperatures, with a sharp lower limit of about 3000 K (i.e. many have been found at all temperatures from 10s of thousands of Kelvin down to 3000K, but none cooler). What does this observation reveal about the age of our galaxy?