The escape velocity for a 100-kg object on Earth is about 11 km/s. What is the escape velocity of a 50-kg object on the surface of Earth?
A) 11 km/s
B) 22 km/s
C) 5.5 km/s
D) 44 km/s
E) 2.75 km/s
A) 11 km/s
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? If the total translational kinetic energy of the molecules of oxygen in a container is 15 J at room temperature, what is the total rotational kinetic energy of these molecules?
A. ?5 J B. ?10 J C. 20J D. ?25 J E. 0J
Acceleration: The captain orders his starship to accelerate from rest at a rate of "1 g" (1 g = 9.8 m/s2). How many days does it take the starship to reach 10% the speed of light? (Light travels at 3.0 × 108 m/s.)
Fill in the blank(s) with the appropriate word(s).
The age of the Milky Way galaxy has been estimated to be at least 13 billion years based on
a. observations of globular clusters. b. observations of open clusters. c. 21-cm radiation from H I regions. d. the rotation curve of the galaxy. e. the energy produced by Sagittarius A.
Exactly 500 grams of ice are melted at a temperature of 32°F. (Lice = 333 J/g.) The change in entropy (in J/K) is
a. 321 b. 146 c. 512 d. 610 e. 5 230