Question

Two spheres each of mass M and radius R are in contact as shown. Find the MOI if they are rotated about the common tangent.

• A. $\frac { 7 } { 5 } \mathrm { MR } ^ { 2 }$
• B. $\frac { 2 } { 3 } \mathrm { MR } ^ { 2 }$
• C. $\frac { 4 } { 5 } \mathrm { MR } ^ { 2 }$
• D.

Answer 1

Answer: (B)

$\frac { 2 } { 3 } \mathrm { MR } ^ { 2 }$

Answer 2

I = .