One hemisphere of Encedalus has a much younger crust than the other, which is heavily cratered
Indicate whether the statement is true or false
TRUE
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What is a quasar?
A) a starlike object that actually represents a bright patch of gas in the Milky Way B) a very large galaxy thought to be formed by the merger of several smaller galaxies, resulting in a quick burst of star formation C) the name given to the largest objects in the Kuiper Belt D) the extremely bright center of a distant galaxy E) another name for very bright stars of spectral type O
A really high-speed train moves in a direction parallel to its length with a speed that approaches the speed of light. The height of the train, as measured by a stationary observer on the ground,
A) approaches infinity. B) approaches zero. C) increases slightly. D) decreases slightly. E) does not change due to the motion.
An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal energy of the athlete?
A) -225 kJ B) -1075 kJ C) 1075 kJ D) 225 kJ E) 276 kJ
Of the many different features of the scientific method, one feature is the most important. Without it, we should not call a field a "science." This feature is
A) the use of only those theories that are known, for certain, to be true. B) that the results should lead to some useful technological application [for example, a useful medical treatment]. C) the use of quantitative measurements. D) the use of mathematics. E) the interaction between theory and observation.