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Chapter 1: Q2CQ (page 11)
How does a model differ from a theory?
Models are mathematical and physical representations of concepts, ideas, or theories for better understanding.
The theory is well-explained aspects of law, concept, fact, and hypothesis.
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Explain why heat pumps do not work as well in very cold climates as they do in milder ones. Is the same true of refrigerators?
If a galaxy is\({\rm{500 Mly}}\)away from us, how fast do we expect it to be moving and in what direction?
Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person’s voice was so loud in the astronaut’s space helmet that it was picked up by the astronaut’s microphone and transmitted back to Earth. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back (that is, neglecting any time delays in the electronic equipment). Calculate the distance from Earth to the Moon given that the echo time was 2.56 s and that radio waves travel at the speed of light (\({\bf{3 \times 1}}{{\bf{0}}^{\bf{8}}}\;{\bf{m/s}}\)).
How many heartbeats are there in a lifetime?
Can classical physics be used to accurately describe a satellite moving at a speed of ? Explain why or why not.
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