Two satellites A and B revolve in coplanar circular orbits of radii and around the…

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

Problem

Two satellites A and B revolve in coplanar circular orbits of radii

r_A

and

r_B

around the same planet. If

r_B = 4\,r_A

, which of the following is correct about their orbital speeds

v_A

and

v_B

? (a)

v_B = 2\,v_A

(b)

v_B = \dfrac{v_A}{2}

(c)

v_B = \dfrac{v_A}{4}

(d)

v_B = v_A