Which of the following expressions gives the magnitude of the speed of a satellite of…

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

Problem

Which of the following expressions gives the magnitude of the speed

v

of a satellite of negligible mass moving in a stable circular orbit of radius

r

around a planet of mass

M

? (

G

is the universal gravitational constant.) (a)

v=\sqrt{\dfrac{2GM}{r}}

(b)

v=\sqrt{\dfrac{GM}{r}}

(c)

v=\sqrt{\dfrac{GM}{2r}}

(d)

v=2\sqrt{\dfrac{GM}{r}}