The photograph shows matter changing states. Which statement best describes what happens to the particles of matter during this
change? Tightly-packed particles gain energy, allowing them to move more freely. Particles move more slowly and bump into one another less frequently. Particles pack closely together, giving the matter a definite shape and volume. A loss of energy strengthens the attraction between particles.
2 answers:
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At a constant speed of 5.00 m/s, the speed at which the poodle completes a full revolution is
so that its period is (where 1 revolution corresponds exactly to 360 degrees). We use this to determine how much of the circular path the poodle traverses in each given time interval with duration
. Denote by
the angle between the velocity vectors (same as the angle subtended by the arc the poodle traverses), then
We can then compute the magnitude of the velocity vector differences for each time interval by using the law of cosines:
and in turn we find the magnitude of the average acceleration vectors to be
So that takes care of parts A, C, and E. Unfortunately, without knowing the poodle's starting position, it's impossible to tell precisely in what directions each average acceleration vector points.
