Physics: Astrophysics: Units
Bayani Gaba-gaba
The astrophysics section shares its units with forces and motion because orbital calculations use the same mechanics. Speed, distance, time, mass, force and gravitational field strength all carry the same SI units you have already met.
This reference lists the seven units for the astrophysics section and highlights the enormous scales involved when applying them to planets, stars and galaxies.
Manufura
- Use the following units: kilogram (kg), metre (m), metre/second (m/s), metre/second2 (m/s2), newton (N), second (s), newton/kilogram (N/kg)
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- Gravitational field strength is measured in: A) m/s B) N/kg C) kg/m3 D) Pa Answer: B
- How many seconds are in one day? A) 3600 B) 36000 C) 86400 D) 8640 Answer: C
- The orbital speed equation is: A) v = rT B) v = 2 pi r / T C) v = T / 2 pi r D) v = r / T Answer: B
- The mass of a planet would be measured in: A) Newtons B) Pascals C) Kilograms D) Joules Answer: C
- Which is the correct conversion? A) 1 year = 3.16 x 10^5 s B) 1 year = 3.16 x 10^7 s C) 1 year = 3.16 x 10^9 s D) 1 year = 3.16 x 10^6 s Answer: B
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Sashen littafi
The Language of Physics: Physical Quantities and Units
Associate physical quantities with their International System of Units (SI)and perform conversions among SI units using scientific notation
"Physics: The Language of Physics: Physical Quantities and Units" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/1-3-the-language-of-physics-physical-quantities-and-units. Access for free at https://openstax.org/books/physics/pages/1-introduction
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