Physics: Astrophysics: Units
Muhtasari
Astrophysics uses exactly the same units as the rest of mechanics, but stretched to sizes that no laboratory ever meets. The Sun is a hundred and fifty thousand million metres away, a year is thirty million seconds long, and gravitational field strength changes completely depending on which world you happen to be standing on.
This lesson covers the kilogram, metre, second, metre per second, metre per second squared, newton and newton per kilogram as they are used in astronomy. You will practise standard form, convert astronomical times and distances into SI units, and use unit checks to catch the sort of error that a very large number hides well.
Malengo
- 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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- The SI unit of gravitational field strength is the: A) Newton B) Newton per kilogram C) Kilogram per newton D) Metre per second Answer: B
- The distance 384 000 km written in metres in standard form is: A) 3.84 x 10^5 m B) 3.84 x 10^6 m C) 3.84 x 10^8 m D) 3.84 x 10^11 m Answer: C
- A light-year is a unit of: A) Time B) Distance C) Speed D) Brightness Answer: B
- An astronaut of mass 80 kg stands on a moon where g is 2.0 N/kg. Her weight there is: A) 40 N B) 80 N C) 160 N D) 784 N Answer: C
- Approximately how many seconds are there in one year? A) 3.15 x 10^5 s B) 3.15 x 10^6 s C) 3.15 x 10^7 s D) 3.15 x 10^9 s Answer: C
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Vitabu Vinavyopendekezwa
Jifunze zaidi kutoka vyanzo huria
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Sehemu ya kitabu
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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