Edexcel IGCSE Physics 8.6 Orbital Speed Equation Questions
Rearrange the orbital-speed equation, convert units before substitution, and use orbital data to find a missing speed, radius or period.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- Calculate orbital speed, orbital radius or time period by rearranging v = 2πr/T.
- Convert time and distance units before substituting values into the orbital-speed equation.
- Use orbital data in tables to calculate or compare orbital periods, speeds or radii.
Edexcel IGCSE Physics 8.6 Orbital Speed Equation Questions question 1
[Maximum number: 3]
A star has a circular orbit around the centre of a galaxy.
The star is 29 000 light years away from the centre of the galaxy and has an
orbital speed of 220 km/s.
Calculate the time period of the star’s orbit around the centre of the galaxy.
Give your answer in standard form.
substitution into given formula;
rearrangement;
evaluation and presentation in standard form;
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