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vazorg [7]
3 years ago
11

When a diver gets into a tuck position by pulling in her arms and legs, she increases her angular speed. Before she goes into th

e tuck position, her angular velocity is 5.5 rad/s, and she has a moment of inertia of 1.4 kg m2. Once she gets into the tuck position, her angular speed is 14.5 rad/s. Determine her moment of inertia, in kg m2, when she is in the tuck position. Assume the net torque on her is zero?
Physics
1 answer:
Oksana_A [137]3 years ago
7 0

The moment of inertia of the diver when she is in the tuck position is 0.53 kg m^2

Explanation:

When the net torque acting on an object is zero, the angular momentum of the object must be conserved.

The angular momentum is given by:

L=I\omega

where

I is the moment of inertia

\omega is the angular velocity

Therefore, in this situation we can write:

L_1 = L_2\\I_1 \omega_1 = I_2 \omega_2

where:

I_1 = 1.4 kg m^2 is the initial moment of inertia of the diver

\omega_1 = 5.5 rad/s is the initial angular velocity

I_2 is the final angular momentum of the diver

\omega_2 = 14.5 rad/s is the final angular velocity of the diver

Solving the equation for I_2, we find:

I_2 = \frac{I_1 \omega_1}{\omega_2}=\frac{(1.4)(5.5)}{14.5}=0.53 kg m^2

Learn more about inertia:

brainly.com/question/2286502

brainly.com/question/691705

#LearnwithBrainly

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A transverse wave on a string is described by the wave functiony(x, t) = 0.350 sin (1.25x + 99.6t)where x and y are in meters an
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The time interval that is between the first two instants when the element has a position of 0.175 is 0.0683.

<h3>How to solve for the time interval</h3>

We have y = 0.175

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complete question

A transverse wave on a string is described by the wave function y(x, t) = 0.350 sin (1.25x + 99.6t) where x and y are in meters and t is in seconds. Consider the element of the string at x=0. (a) What is the time interval between the first two instants when this element has a position of y= 0.175 m? (b) What distance does the wave travel during the time interval found in part (a)?

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