Precession of the rotation axis of Earth is caused by
a. the force of gravity from the Sun and Moon on Earth's equatorial bulge.
b. the force of gravity from the Sun and Jupiter on the Earth-Moon system.
c. the magnetic field of Earth.
d. the formation and subsequent melting of glaciers during the ice-ages.
e. the impact of asteroids.
a
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How can tidal forces affect the rotation of celestial bodies and their orbital motion?
What will be an ideal response?
An aggregate of two or more minerals is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 4.0 cm from the center of the two surfaces?
a. 3.8 N/C b. 4.1 N/C c. 3.5 N/C d. 3.2 N/C e. 0.28 N/C
A circuit consists of 2N resistors, all of resistance R, connected as shown below. A potential difference V is applied to one end, and the other end is at ground potential. The equivalent resistance of the circuit is
a.
.
b.
R.
c.
