Identify the FALSE statement. Cosmology:
is the study of the structure and evolution of the Universe.
has ancient beginnings in many cultures.
was dominated by the geocentric model for centuries.
became more scientific and modern with the work of Renaissance thinkers like Copernicus, Kepler, Galileo, and Newton.
currently advocates the heliocentric model, which states that the Sun, not the Earth, is the center of the Universe.
currently advocates the heliocentric model, which states that the Sun, not the Earth, is the center of the Universe.
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A 5.0-liter gas tank holds 1.4 moles of helium (He) and 0.70 moles of oxygen (O2), at a temperature of 260 K
The atomic masses of helium and oxygen are 4.0 g/mol and 16.0 g/mol, respectively. Avogadro's number is 6.022 × 1023 molecules/mol and the Boltzmann constant is 1.38 × 10-23 J/K. The total random translational kinetic energy of the gas in the tank is closest to A) 6.8 kJ. B) 6.1 kJ. C) 7.6 kJ. D) 8.3 kJ. E) 9.1 kJ.
Uniform Circular Motion: A car traveling at a steady 20 m/s rounds an 80-m radius horizontal unbanked curve with the tires on the verge of slipping. What is the maximum speed with which this car can round a second unbanked curve of radius 320 m if the coefficient of static friction between the car's tires and the road surface is the same in both cases?
A. 160 m/s B. 80 m/s C. 70 m/s D. 40 m/s E. 30 m/s
Compared to the Sun, white dwarfs have higher ________ and lower ________.
A. volumes; surface temperatures B. luminosities; surface temperatures C. masses; surface temperatures D. surface temperatures; luminosities
White dwarfs are so called because
A) they are both very hot and very small. B) they are the end-products of small, low-mass stars. C) they are the opposite of black holes. D) it amplifies the contrast with red giants. E) they are supported by electron degeneracy pressure.