Which types of galaxies lack an ordered structure of stellar orbits?
a. elliptical galaxies only
b. spiral galaxies only
c. irregular galaxies only
d. elliptical and irregular galaxies
e. spiral and irregular galaxies
c
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A uniform solid sphere of mass M and radius R rotates with an angular speed ? about an axis through its center
A uniform solid cylinder of mass M, radius R, and length 2R rotates through an axis running through the central axis of the cylinder. What must be the angular speed of the cylinder so it will have the same rotational kinetic energy as the sphere? A) 2?/5 B) ? C) 4?/5 D) 2?/ E) ?/
On average, a body 100 meters in diameter or larger impacts Earth every ________ years.
A. 10 million B. 100,000 C. 1,000 D. 10,000 E. one million
The greater proportion of energy immediately converted to heat rather than light occurs in
A) a fluorescent lamp. B) an incandescent lamp. C) both of these D) neither of these
A flatbed truck is carrying a 20.0-kg crate down a sloping road inclined 15.0° below the horizontal. The coefficient of static friction between the crate and the bed is 0.400
What is the maximum acceleration that the truck can have if the crate is to stay in place? A) 1.25 m/s2 B) 0.625 m/s2 C) 2.50 m/s2 D) 3.16 m/s2 E) 6.33 m/s2