What is the change of entropy of water (Lf = 0.333 MJ/kg, Lv = 2.26 MJ/kg) when 450. grams of water:
(a) changes from liquid to steam?
(b) changes from ice to liquid?
(a) 2.73 kJ/K
(b) 549. J/K
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_____ is proposed dark matter made up of particles other than protons and neutrons
A) Baryonic matter B) Biotic matter C) Nonbaryonic matter D) Abiotic matter
The rate of cratering
A) has remained constant over the last 4.6 billion years. B) has recently increased with more collisions in the asteroid belt. C) fluctuates over time, with massive bodies occasionally coming in from the Oort Cloud. D) shows that large asteroid impacts are more common now than in the past. E) shows that most interplanetary debris was swept up soon after the formation of the solar system.
Different colors of light correspond to different light
A) velocities. B) intensities. C) polarities. D) frequencies. E) none of the above
In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.5 km?
A) 79 m/s B) 310 m/s C) 260 m/s D) 160 m/s E) 510 m/s