A solid ball - kinetic energy and angular speed

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Homework Help Overview

The discussion revolves around a solid ball's rotational kinetic energy and its angular speed, given specific parameters such as mass and diameter. Participants are exploring the relationships between these physical quantities in the context of rotational motion.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the formula for rotational kinetic energy and the moment of inertia for a solid sphere. Questions are raised about the conversion between revolutions and radians, as well as the implications of adding energy to the system.

Discussion Status

The conversation is ongoing, with some participants seeking clarification on the moment of inertia and the relationship between angular speed and energy. There is an indication of differing interpretations regarding the provided information and its application.

Contextual Notes

Participants are working with specific values for mass and diameter, but there may be assumptions about the initial conditions and the definitions of terms that are not fully clarified.

HandcuffedKitty
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A solid ball of mass 1.30 kg and diameter 19.0 cm is rotating about its diameter at 65.0 rev/min.

What is its kinetic energy?

Also, if an additional 2.60 J of energy are supplied to the rotational energy,

what is the new angular speed of the ball?
 
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Rotational kintic energy is given by

[tex]{KE = \frac 1 2 I \omega^2[/tex]

Where I is the moment of initera and [tex]\omega[/tex]= angular velocity.
 
Thanks a lot

That doesn't help any
 
Were you given that, for a solid sphere, I=2MR2/5 ?

How many radians are there in a revolution?
 

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