Two identical satellites orbit the same planet in circular paths

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

Problem

Two identical satellites orbit the same planet in circular paths. Satellite 1 moves at radius

R

with kinetic energy

K_1

. Satellite 2 moves at radius

4R

. Which of the following gives the kinetic energy

K_2

of Satellite 2 in terms of

K_1

? (a)

K_2 = K_1

(b)

K_2 = \dfrac{K_1}{4}

(c)

K_2 = 16 K_1

(d)

K_2 = \dfrac{K_1}{2}