What is the angular speed about the rotational axis of the Earth for a person standing on the surface?
a. 7.3 × 10^?5 rad/s
b. 3.6 × 10^?5 rad/s
c. 6.3 × 10^?5 rad/s
d. 3.1 × 10^?5 rad/s
a
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Which of the following is not due to tidal forces?
A) the synchronous rotation of the Moon around Earth B) the volcanos on Io (a moon of Jupiter) C) the rings of Saturn D) the grooved terrain of Enceladus (a moon of Saturn) E) the backward orbit of Triton (a moon of Neptune)
The typical density and temperature of molecular clouds are
A) 100 molecules per cubic centimeter, 10-30 Kelvin. B) 300 molecules per cubic centimeter, 10-30 Kelvin. C) 1000 molecules per cubic centimeter, 10-30 Kelvin. D) 100 molecules per cubic centimeter, 100-300 Kelvin. E) 300 molecules per cubic centimeter, 100-300 Kelvin.
Which planet could an astronaut visit without the need for a spacesuit (and survive)?
A) the Moon B) Mars C) Mercury D) Venus E) None; an astronaut would need a spacesuit to survive a visit to any other planet in the solar system.
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.