A satellite in a circular orbit of radius around Earth takes to complete one revolution

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A satellite in a circular orbit of radius

42\,400\,\text{km}

around Earth takes

24\,\text{h}

to complete one revolution. Approximately what orbital radius is required for another satellite to have a period of

12\,\text{h}

? (a)

21\,200\,\text{km}

(b)

29\,000\,\text{km}

(c)

26\,700\,\text{km}

(d)

30\,000\,\text{km}