Resorces « previous | 15 of 25 ne Correct rt B With a skilful move, the majorett

Question

Resorces « previous | 15 of 25 ne Correct rt B With a skilful move, the majorette changes the rotation of her baton so that now it is spinning about an axis passing through its end at the same angular velocity 3.00 rad/s as before. (Eigure 2) What is the new magnitude of the angular momenturm of the rod about a point where the axis of rotation intersects the end of the baton? Express your answer in kilogram meters squared per second. Hints 0.0576 kg m2/s Submit My Answers Give Up Incorrect; Try Again; 4 attempts remaining Continue acer

Explanation / Answer

Part a:

moment of inertia

I = mL²/12

I = 0.120kg * (0.8m)²/12

I = 0.0064 kg·m²

so angular momentum

L = I*

L = 0.0192 kg·m²/s

L = 1.92 x 10-2 kg·m²/s

Part b:

Moment of inertia of rod = 1/3*m*L2

I = 1/3*0.12*0.82

I = 0.0256 kg·m²

Angular momentum = 0.0256*3

L = 7.68 x 10-2 kg·m²/s

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