A Hoop with a Mass of 2

question 22

Multiple Choice

A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts down a ramp that makes an angle of 25° below the horizontal.What is the rotational kinetic energy of the hoop after it has rolled 3.0 m down as measured along the surface of the ramp?

• A)34 J
• B)22 J
• C)45 J
• D)62 J
• E)This question cannot be answered without knowing the radius of the hoop.

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