The dark spots in this photo (such as the one indicated by the arrow) represent what we call
A) sunspots.
B) convection zones.
C) coronal holes.
D) solar prominences.
E) Great Dark Spots.
A) sunspots.
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What is the angular momentum of the Moon about the Earth? The mass of the Moon is 7.35 × 1022 kg, the center-to-center separation of the Earth and the Moon is 3.84 × 105 km, and the orbital period of the Moon is 27.3 days. Ignore the small offset of the center of mass of the system from the center of the Earth in your calculation.
What will be an ideal response?
Consider the events A, B, C, and D shown in the space time diagram below. What is the space time interval between events A and B?
A. 0 s
B. 2 s
C. 3 s
D. 4 s
E. 5 s
F. Other (specify)
What is the agreed-upon direction of rotational velocity?
a. The direction the object is rotating (effectively clockwise). b. In the direction opposite to the way the object is rotating (effectively counterclockwise). c. Along the axis of rotation in the direction your thumb would point if the fingers of your left hand curl along the motion of the spinning object. d. Along the axis of rotation in the direction your thumb would point if the fingers of your right hand curl along the motion of the spinning object. e. Along the axis of rotation in the direction your index finger would point if the thumb of your right hand points along the motion of the spinning object.
Which of the following geological processes has shaped the surface of the Earth?
A) plate tectonics B) volcanism C) erosion D) all of these