In addition to the conditions required for any solar eclipse, what must also be true in order for you to observe a total solar eclipse?
A) Earth must lie completely within the Moon's full shadow (umbra).
B) Earth must lie completely within the Moon's partial shadow (penumbra).
C) Earth must be near aphelion in its orbit of the Sun.
D) The Moon's full shadow (umbra) must touch the area where you are located.
E) The Moon's partial shadow (penumbra) must touch the area where you are located.
C) Earth must be near aphelion in its orbit of the Sun.
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The element rubidium (Rb, atomic number 37) is in Group IA of the periodic table, thus the chemical bonding should be ______________.
Fill in the blank(s) with the appropriate word(s).
The ____ of the Moon is the period of time for the Moon to complete a cycle of the lunar phases and is approximately 29.5 days long
a. sidereal period b. Saros cycle c. synodic period d. eclipse season e. umbral period
Torque: Two forces produce equal torques on a door about the door hinge. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force has a greater magnitude?
A. the first force (at the midpoint) B. the second force (at the doorknob) C. The two forces are equal.
A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion
A) is zero. B) moves horizontally. C) moves vertically. D) moves along a parabolic path.