Physics-
General
Easy
Question
A mouse, searching for food, jumped onto the rim of a stationary circular disk mounted on a vertical axle. The disk is free to rotate without friction. The velocity of the mouse was tangent to the edge of the disk before it landed. When the mouse landed, it gripped the surface, remained fixed on the outer edge of the disk at a distance R from the center, and set it into rotation. The sketch indicates the situation The mass of the mouse is m = 0.10 kg, the radius of the disk is R = 0.20 m, and the rotational inertia of the disk is I = 0.0080 kg· 
The speed of the mouse, just before it landed on the disk is 
= 1.5 m/s. Magnitude of the angular velocity of the disk plus mouse, after it landed becomes
- 0.25 rad/s
- 2.5 rad/s
- 0.375 rad/s
- 3.75 rad/s
The correct answer is: 2.5 rad/s
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