If no net external force acts on a system, the total momentum of the system is a conserved quantity
Indicate whether the statement is true or false
TRUE
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Which of the following best describes the nature of planetary rings?
a. They are composed of countless individual particles. b. The are solid, concentric rings around a planet. c. They are a solid sheet of material around a planet, looking much like a DVD or blu-ray disk. d. They are composed of reflective molecules of gas.
A car starts from rest and accelerates with a constant acceleration of 1.00 m/s2 for 3.00 s. The car continues for 5.00 s at constant velocity. How far has the car traveled from its starting point?
A) 24.0 m B) 9.00 m C) 19.5 m D) 4.50 m E) 15.0 m
The size of a galaxy's central black hole is proportional to the mass of its disk
a. True b. False Indicate whether the statement is true or false
The choices describe four hypothetical planets. Which one would you expect to have the most features of erosion? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: same as Venus Distance from Sun: same as Mars Rotation rate: once every 25 hours B) Size: same as the Moon Distance from Sun: same as Mars Rotation rate: once every 10 days C) Size: same as Mars Distance from Sun: same as Earth Rotation rate: once every 18 hours D) Size: twice as big as Earth Distance from Sun: same as Mercury Rotation rate: once every 6 months