Explain why people who live close to the equator do not experience major changes in the seasons
What will be an ideal response?
Near or at the equator the length of day and night is roughly equal, so the amount of solar radiation varies very little over the course of the year.
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A star on the upper edge of the main sequence denotes that:
A) it has exhausted nearly all hydrogen in its center. B) it has reached stability for the first time. C) it is in the zero-age main sequence. D) it is converted into a brown dwarf.
A sunspot maximum occurred in the year 2015. If the solar cycle continues, the year of the sunspot maximum that immediately follows the 2015 cycle maximum will be _____
A) 2026 B) 2020 C) 2016 D) 2030
The thermal conductivity of aluminum is twice that of brass. Two rods (one aluminum and the other brass) of the same length and cross-sectional area are joined together end to end
The free end of the brass rod is maintained at 0°C and the free end of the aluminum rod is maintained at 200°C. If no heat escapes from the sides of the rods, what is the temperature at the place where the two rods are joined together? A) 76°C B) 133°C C) 148°C D) 155°C
Melanie says that when a diver enters an underwater cave of height h, the pressure on her is no greater than ?Wgh. Rosalind says that if the bottom of the cave is a distance H below the water surface, the pressure on the soles of the diver's feet can reach ?WgH. Which one, if either, is correct? (The density of water is ?W.)
a. Melanie, because the roof of the cave absorbs the water pressure from above. b. Melanie, because only the fluid directly above any volume of the fluid can contribute to the pressure on that volume. c. Rosalind, because a fluid exerts equal pressure in all directions at a given depth. d. Rosalind, because the pressure also depends on the density, ?c, of the material above the cave roof, so that p = ?cg(H ? h) + ?Wgh. e. Melanie, because the pressure equals p = ?WgH ? ?cg(H ? h).