Astrophysics: Units
Bayani Gaba-gaba
Astrophysics deals with distances, speeds, and forces on a scale that can feel overwhelming at first. A star might be millions of light-years away, orbiting bodies travel at kilometres per second, and gravitational fields stretch across entire solar systems. Keeping the units under control is the first step toward tackling any calculation in this section.
This lesson gathers the units the Edexcel specification lists for the Astrophysics section, explains what each one measures, and gives you practice converting and applying them. Several of these units (kg, m, N, s) also appear in earlier sections, so this is a chance to consolidate what you already know while adding the astrophysics-specific quantities.
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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- What is the SI unit of gravitational field strength? A) m/s2 B) N/kg C) kg/m3 D) Pa Answer: B
- Which pair of units are dimensionally equivalent? A) N and kg B) N/kg and m/s2 C) m/s and m/s2 D) kg and N/kg Answer: B
- The mass of the Earth is approximately 6.0 x 10^24 kg. What unit is this expressed in? A) Grams B) Tonnes C) Kilograms D) Newtons Answer: C
- What unit is orbital speed measured in? A) m/s2 B) N C) m/s D) kg Answer: C
- A planet has g = 3.7 N/kg. An object of mass 20 kg has a weight of: A) 74 N B) 5.4 kg C) 37 N D) 0.19 N/kg Answer: A
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Sashen littafi
Physical Quantities and Units
The range of objects and phenomena studied in physics is immense. From the incredibly short lifetime of a nucleus to the age of the Earth, from the tiny sizes of sub-nuclear particles to the vast distance to the edges of the known universe, from the force exerted by a jumping flea to the force betwe
"College 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/college-physics/pages/1-2-physical-quantities-and-units. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
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