What may have caused Mercury to have a large metallic core and a relatively thin crust?
a. a large impact
b. tidal coupling with the Sun
c. solar wind clearing the nebula
d. a slow orbital period
e. a long period of flooding
a
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Which of the following energy forms is associated with an object due to its position?
a. potential b. positional c. total d. kinetic
According to Copernicus, the retrograde motion for Mars must occur:
A) at inferior conjunction, when Mars laps the Earth and passes between us and the Sun. B) at superior conjunction, when Mars lies on the far side of the Sun. C) at quadrature, when Mars lies exactly 90 degrees east or west of the Sun. D) at greatest elongation, when Mars can get up to 47 degrees from the Sun. E) at opposition, when the Earth overtakes Mars and passes between Mars and the Sun.
What three factors affect porosity?
What will be an ideal response?
Magnetic Field of a Long Wire: A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance d from the wire. To measure a field of 5 mT due to this wire, you would have to go to a distance from the wire of
A. 16d.
B. 8d.
C. 4d.
D. 2d.
E. d