Another diver leaves a platform with an angular momentum (H) of 1500 kg m sec. H

Question

Another diver leaves a platform with an angular momentum (H) of 1500 kg m sec. Her angular velocity (o) is initially 5 rad/sec. If she needs to increase her angular velocity to 6 rad/sec, what should she do? O Tuck her body into a tighter ball, decreasing her moment if inertia (I) to 250 kg 2. Open up her body into a more extended position, decreasing her moment if inertia () to 250 kg m2 Open up her body into a more extended position, increasing her moment if inertia () to 350 kg m2 O Tuck her body into a tighter ball, increasing her moment if inertia () to 350 kg m2

Explanation / Answer

Correct Ans is:

Tuck her body into a tighter ball, decreasing her moment of inertia to 250 kg-m^2

explanation:

we know that,

L = I w

I = L/w => I1 = L/w1 = 1500/5 = 300 kg-m^2

from conservation of angular momentum

L1 = L2

I1 w1 = I2 w2

I2 = (w1/w2) I1 = (5/6) x 300 = 250 kg-m^2

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