Which of the following processes is involved in the sunspot cycle?
A) a large change in the amount of visible light emitted by the Sun
B) an imbalance in the operation of the solar thermostat
C) a slight gravitational contraction of the Sun
D) small variations in the rate of nuclear energy generation in the solar interior
E) the winding of magnetic field lines due to the Sun's rotation
E
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Work: A person carries a 25.0-N rock through the path shown in the figure, starting at point A and ending at point B. The total time from A to B is 1.50 min. How much work did gravity do on the rock between A and B?
A. 625 J B. 20.0 J C. 275 J D. 75 J E. 0 J
According to the reanalysis of the Apollo seismic data in 2011, what is the structure of the lunar interior?
What will be an ideal response?
Imagine that an electron with an initial spin state 
goes into an SGz device and comes out the – channel of that device. The electron’s spin state is now
A. 
B. 
C. 
D. 
E. 
A 1000-turn toroid has a central radius of 4.2 cm and is carrying a current of 1.7 A. The magnitude of the magnetic field along the central radius is
A) 8.1 × 10-3 T. B) 5.1 × 10-2 T. C) 1.6 × 10-2 T. D) 8.1 × 10-2 T. E) 0.