Briefly describe the Sun's 22 year activity cycle
What will be an ideal response?
The Sun's activity cycle is tied directly to its magnetic activity. At the beginning of the cycle, at solar minimum, there are few sunspots visible on the Sun and there are few solar flares and coronal mass ejections. As time passes, new sunspots form at higher latitudes. As magnetic activity increases, sunspots form nearer the equator and in greater numbers. Eleven years later, at solar maximum and the height of magnetic activity, we observe many sunspots, solar flares, and coronal mass ejections. As the formation of sunspots approaches the Sun's equator, the polarity of the Sun flips: the north magnetic pole becomes the south magnetic pole and vice versa. It will take another full eleven year cycle to flip the magnetic polarity of the Sun back to its original configuration, and this completes the 22 year cycle.
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Energy transport by ____________________ is important when photons cannot readily travel through a gas
Fill in the blank(s) with correct word
Which of the following combinations of units is equivalent to the tesla?
a) N/(A*m) b) N*A/m c) (Js)/(Am) d) J/(C*s) e) C/(J*s)
A point charge Q is placed on the x axis at the origin. An identical point charge is placed on the x axis at x = ?1.0 m and another at x = +1.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on the charge at x = +1.0 m?
A. 29 N B. 14 N C. 11 N D. 18 N E. 7.0 N
Newtonian physics, coupled to the idea that everything is made of atoms, has led many scientists and philosophers to the conclusion that everything in the universe, including all human actions and human feelings, is pre-determined by the laws of
physics and acts just like a machine. Which of the following statements is a scientifically-acceptable reason for disagreeing with this conclusion? A) Isaac Newton himself believed that humans have free will. B) We should never accept scientific theories as absolute truth. C) Both of the above. D) Our own intuitions, or beliefs, inform us that we actually do have free will. E) None of the above.