Which of the following best describes what we mean by a habitable world?
A) a planet or moon that could support life, if any life happened to be on it
B) a planet or moon with life
C) a planet or moon that lies within its star's habitable zone
D) a planet or moon on which humans could survive if we happened to go there
A
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Consider the sun and its largest planet Jupiter. On the line joining them, how far from the center of the sun is their center mass? Is it within or outside the sun? (Jupiter-sun distance is 778 × 106 km, diameter of the sun is 1
4 × 106 km, the sun is 1000 times as massive as Jupiter)
A uniform rod (length = 2.4 m) of negligible mass has a 1.0-kg point mass attached to one end and a 2.0-kg point mass attached to the other end. The rod is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through a point 1.0 m from the 2.0-kg mass. The rod is released from rest when it is horizontal. What is the angular velocity of the rod at the
instant the 2.0-kg mass passes through its low point? a. 1.7 rad/s b. 2.2 rad/s c. 2.0 rad/s d. 1.5 rad/s e. 3.1 rad/s
What is the relationship between wavelength (?) and frequency (f)? ("c" is the speed of light.)
A. ?/f = c B. f/? = c C. ?f = c D. ?c = f
Electrons orbit the atomic nucleus in just the same way that planets orbit the Sun.
Answer the following statement true (T) or false (F)