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AST112 Exam 1
Astronomy
| Question | Answer | |
|---|---|---|
| Fundamental Forces | Strong force, Electromagnetic Force, Weak Force and Gravity | |
| What is the purpose of the strong force? What is the particle | - Strongest Force - Holds the Nucleus of the atom together - Particle = Gluons | |
| What is the strength and range of the Strong Force? | Strength = 1 Range = 10^(-15) (about the size of a medium sized nucleus) | |
| What is the purpose and particle of the electromagnetic force? | - chemistry and biology - Photons | |
| What is the strength and and range of the electromagnetic force? | - 1/137 the strength of the strong force - the range is infinite | |
| what are the most important forces for astronomy | gravity and the electromagnetic | - gravity shapes the universe - light caries information and energy through the universe |
| What did Isaac Newton Do? | - He developed laws for physical matter - (1642-17270 | |
| Newton's law of universal Gravitation? | - 2 bodies attract each other with a force that is proportional to the mass of each body and inversely proportional to the square of the distance between them | f=g [(m1m2)/r^2)] g=gravitational constant=6.67x10^(-11) r=radius/distance m1=mass1 AND m2=mass2 |
| What does Newton's law explain | something must be acting on the planets to keep them in orbit | no friction in space, so planets would otherwise just fly-off without a force holding them in orbit |
| Kepler's first law | the orbits of planets (or stars) are ellipses | |
| what is the purpose and particle of Gravity | - strength = 6x10^(-39) - range = infinite |
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ithuestad
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