Look back at the statements from Part A that were known prior to New Horizons. Complete the sentences below to explain how we knew each of them.
Answer:
Scientist knew the approximate mass of Pluto because the 1978 discovery of its moon Charon allowed them to calculate it with Newton's version of Kepler 19s third law.
Scientist knew the approximate composition of Pluto from Pluto's calculated density.
Scientists knew that Pluto is a member of the Kuiper belt because they had discovered hundreds of other objects orbiting in the same region of the solar system.
Scientists knew that Pluto is sometimes nearer to the Sun than Neptune because decades of observation at allowed them to precisely plot its orbit.
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One kilogram of chilled water at 32°F (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed to operate the compressor to cool this water to 0°F if the room temperature is maintained at 75°F (24°C)? (Lice = 3.33 × 10^5 J/kg; cice = 2.09 × 10^3 J/kg/°C)
a. 13 b. 1.5 c. 15 d. 16 e. 33
Angular and Linear Quantities: A wheel of diameter 0.70 m rolls on the floor without slipping. A point at the top of the wheel moves with a speed 2.0 m/s relative to the floor.(a) At what speed is the central axis of the wheel moving relative to the floor?(b) What is the angular speed of the wheel?
What will be an ideal response?
If one of the pair of Magdeburg hemispheres were fastened to a strong tree, the force needed by a single party to pull them apart would be
A) half as much. B) the same. C) twice as much. D) none of the above
A ball is attached to a string and revolves in a horizontal circle with angular momentum. When the string breaks at point B on the circumference, the ball moves off tangentially along path B-Q
As it moves along B-Q, increasing its distance from the center of the circle, its angular momentum A) decreases. B) is now zero. C) remains constant. D) increases.