A "double satellite" is launched into space. It consists of a satellite of mass m and another satellite of mass 5m. The connecting mechanism of these satellites is an explosive bolt and a compressed spring, both of negligible mass. The bolt is exploded and the satellites drift apart having been pushed by the spring. When the less massive satellite has moved a distance of 2.5 m from the center of
mass of the double satellite, how far away from it is the satellite of greater mass?
a. 3.0 m b. 2.0 m
c. 0.50 m d. 4.5 m
a
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The resolution of Olbers's paradox suggests that it gets dark at night because
a. the Universe is not infinite in age. b. the Universe is static. c. the Universe is closed. d. the Universe is not infinite in age and the Universe is static. e. All of the other choices are correct.
Prior to 1991, most astronomers assumed that gamma-ray bursts came from neutron stars (with accretion disks) within the Milky Way Galaxy. How do we now know that this hypothesis was wrong?
A) Observations from the Compton Gamma-Ray Observatory showed that gamma-ray bursts occur too frequently to be attributed to neutron stars. B) Observations from the Compton Gamma-Ray Observatory showed that gamma-ray bursts come randomly from all directions in the sky. C) Observations from the Compton Gamma-Ray Observatory allowed us to trace gamma-ray bursts to pulsating variable stars in distant galaxies. D) We now know that gamma-ray bursts come not from neutron stars but from black holes. E) Theoretical work has proven that gamma rays cannot be produced in accretion disks.
In order to produce a sustained interference pattern by light waves from multiple sources, which of the following conditions must be met?
a. Sources are coherent. b. Sources are monochromatic. c. Both choices above are valid. d. None of the choices above are valid.
A 6.0-?F capacitor charged to 50 V and a 4.0-?F capacitor charged to 34 V are connected to each other, with the two positive plates connected and the two negative plates connected. What is the total energy stored in the 6.0-?F capacitor at equilibrium?
a. 6.1 mJ b. 5.7 mJ c. 6.6 mJ d. 7.0 mJ e. 3.8 mJ