We proved, using Einstein's two basic principles, that if Velma is moving past Mort then Mort should observe Velma's clock to go slow. This behavior of Velma's clock occurs because, as observed by Mort,
A) the light beam in her light-clock travels less than 300,000 km during one of Velma's ticks.
B) the light beam in her light-clock travels further than 300,000 km during one of Velma's ticks.
C) Velma's light-clock shortens along its direction of motion.
D) the light beam in Velma's light-clock travels at slower than the normal lightspeed.
E) the light beam in Velma's light-clock travels at faster than the normal lightspeed.
B
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Copernicus
a. proposed that the Earth orbited the Sun. b. showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun. c. neither proposed that the Earth orbited the Sun and showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun. d. both proposed that the Earth orbited the Sun and showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun.
According to kinetic theory, a typical gas molecule in thermal equilibrium at room temperature has a kinetic energy K = 6.00 × 10?21 J, regardless of mass. Estimate the speed at room temperature of a hydrogen molecule H2 (m = 3.34 × 10?27 kg) and a xenon atom (m = 2.00 × 10?25 kg). [kB = 1.38 × 10?23 J/K]
What will be an ideal response?
Proxima Centauri is _____ away from Earth
A) 2.1 light-years B) 4.2 light-years C) 6.3 light-years D) 8.4 light-years
The text states that luminous matter in the Milky Way seems to be much like the tip of an iceberg. This refers to the idea that
A) dark matter represents much more mass and extends much further from the galactic center than the visible stars of the Milky Way. B) luminous matter emits white light, much like the light reflected from icebergs. C) black holes are much more interesting than ordinary stars that give off light. D) the luminous matter of the Milky Way is essentially floating on the surface of a great sea of dark matter.