The tail of a comet always points
A) away from the Sun and becomes longest and brightest at perihelion.
B) toward Earth and never varies.
C) away from the Sun and disappears at perihelion.
D) toward the Sun and disappears at perihelion.
E) in the direction of the comet's motion.
A
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You are somewhere in the solar system. It's much colder than Earth, and you are airborne in the planet's atmosphere, with blue skies around you. And while you can tell that your planet is rotating fairly rapidly, it is remaining daylight at all times, indicating a very large axis tilt (much larger than Earth's). Where are you?
A) Saturn B) Uranus C) Mars D) Jupiter
Which type of planet once had (or has) a molten core?
A) Dwarf B) Terrestrial C) Jovian
Stromatolites formed in rocks with radioactive ages of 3.4 billion years, and they still form in some places today
Indicate whether the statement is true or false
An elevator weighing 20 000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2? (g = 9.80 m/s2)
a. 6.1E+3 N b. 2.0E+4 N c. 6.0E+4 N d. 2.6E+4 N e. 6.7E+3 N