Briefly describe the four possible expansion patterns (or fates) of the universe
What will be an ideal response?
1. Re-collapsing universe: the density of the universe is greater than critical. Gravity will eventually reverse the expansion, resulting in a "Big Crunch."
2. Critical universe: the density of the universe is equal to the critical density. Gravity just balances the expansion which slows toward zero as time progresses.
3. Coasting universe: the density of the universe is less than the critical density. The expansion overwhelms the attractive force of gravity and the universe expands without limit.
4. Accelerating universe: a mysterious repulsive force that acts against gravity on large scale causing the universe to expand with ever-increasing speed.
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In the context of the Sun's atmosphere, discuss the important properties of spectra
What will be an ideal response?
A 60.0-kg person rides in an elevator while standing on a scale. The scale reads 400 N. The acceleration of the elevator is closest to
A) 3.13 m/s2 downward. B) 6.67 m/s2 downward. C) zero. D) 9.80 m/s2 downward. E) 6.67 m/s2 upward.
A double loop of wire (making 2 turns) is in the x-y plane centered at the origin. A uniform magnetic field is increasing at a constant rate in the negative z direction. In which direction is the induced magnetic field in the loop?
a. There is no induced field because of the double loop. b. There is no induced field because the rate of change of the magnetic field is constant. c. in the negative z direction d. in the positive z direction
While Voyagers were probes that flew past in a few days, Galileo and Cassini are orbiters, designed to study Jupiter and Saturn over prolonged periods of time
Indicate whether the statement is true or false