Two gerbils run in place with a linear speed of 0.50 m/s on an exercise wheel that is shaped like a hoop. Find the angular momentum of the system if each gerbil has a mass of 0.22 kg and the exercise wheel has a radius of 8 cm and a mass of 4.5 g.

Respuesta :

Answer:

[tex]L = 0.018 kg m^2/s[/tex]

Explanation:

Angular speed and linear speed is related to each other as

[tex]v = R\omega[/tex]

here we know that

[tex]v = 0.50 m/s[/tex]

[tex]R = 0.08 m[/tex]

now we have

[tex]\omega = \frac{v}{R}[/tex]

[tex]\omega = \frac{0.50}{0.08}[/tex]

[tex]\omega = 6.25 rad/s[/tex]

Now we know that moment of inertia of the system is given as

[tex]I = (2M + m)R^2 [tex]

[tex]I = (2\times 0.22 + 0.0045)(0.08)^2[/tex]

[tex]I = 2.84 \times 10^{-3} kg m^2[/tex]

Now angular momentum of the system is given as

[tex]L = I\omega [/tex]

[tex]L = (2.84 \times 10^{-3})(6.25)[/tex]

[tex]L = 0.018 kg m^2/s[/tex]