Physics

Problem

20. An astronaut in an orbiting space craft attaches a mass

m

to a string and whirls it around in uniform circular motion. The radius of the circle is

R

, the speed of the mass is

v

, and the tension in the string is

F

. If the mass, radius, and speed were all to double the tension required to maintain uniform circular motion would be (A)

F

(B)

2 F

(C)

4 F

(D)

8 F

(A)

F

(B)

2 F

(C)

4 F

(D)

8 F