A Solid Sphere of Radius R = 5 Cm and Mass

question 7

Multiple Choice

A solid sphere of radius r = 5 cm and mass m = 0.2 kg rolls in a groove as shown.The angle, $\theta$ ,between the points of contact with the groove is 120 ^$\circ$ .If the sphere has a linear velocity of 10 mm/s,what is the rotational kinetic energy?

• A)0.8 mJ
• B)1.0 mJ
• C)1.6 mJ
• D)2.0 mJ
• E)undetermined.

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