Might changes in the Sun affect weather or climate on Earth?
What will be an ideal response?
During the last Maunder minimum period, the Earth experienced the Little Ice Age. However, it is unknown whether the low solar activity caused this or it was just a coincidence. Also it may be possible that drought cycles or storms are correlated with solar activity. Current climate models however indicate that the magnitude of observed warming can only be explained by including anthropogenic factors.
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A pair of parallel conducting plates have potentials of -17 V and 55 V, respectively. An electron is ejected from the plate at potential -17 V and travels to the plate at 55 V. What is the speed of the electron as it strikes the 55 V plate, assuming it left the -17 V plate from rest? The mass of the electron is 9.11 x 
kg.
a. 
b. 
c. 
d. 
Which of the following has the shortest wavelength?
What will be an ideal response?
The coil in a 60-Hz ac generator has 125 turns, each having an area of 3.0 × 10-2 m2 and is rotated in a uniform 0.12-T magnetic field. What is the peak output voltage of this generator?
A) 170 V B) 120 V C) 200 V D) 110 V E) 220 V
The magnitude scale
a. originated just after the telescope was invented. b. can be used to indicate the apparent intensity of a celestial object. c. was devised by Galileo. d. is no longer used today. e. was used to determine the rate of precession.