Which of the following statements best describes Kepler's 3rd law of planetary motion?
a. The smaller the diameter of a planet, the faster its rotational period is.
b. The orbital period of a planet is directly proportional to the diameter of the planet.
c. The smaller the orbit, the longer its orbital period is.
d. The larger the orbit, the longer its orbital period is.
d
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Stars are mostly made of
A) hydrogen and helium B) pure hydrogen C) carbon, hydrogen, oxygen and nitrogen D) an equal mixture of all elements
What is the approximate surface temperature of a B star?
A) 8,000 K B) 6,000 K C) 20,000 K D) 40,000 K
Two forces produce equal torques on a door about the door hinge. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door
Which force has a greater magnitude? A) the first force (at the midpoint) B) the second force (at the doorknob) C) The two forces are equal.
The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system. b. inelastic collisions between particles within the system. c. changes of momentum of individual particles within the system. d. internal forces acting between particles within the system. e. external forces acting on particles of the system.