Kinetic Energy rotational motion problem, help please

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Homework Help Overview

The problem involves a 2.4 kg cylinder rolling down a ramp, focusing on the concepts of kinetic energy in both translational and rotational forms. The scenario presents questions about the total kinetic energy, rotational kinetic energy, and translational kinetic energy of the cylinder at the bottom of the ramp.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the kinetic energies but expresses uncertainty about determining the speed of the cylinder. Some participants hint at conservation principles, prompting questions about which quantities are conserved during the motion.

Discussion Status

The discussion is ongoing, with participants exploring the conservation of energy concept. There is no explicit consensus yet, but hints have been provided that may guide further exploration of the problem.

Contextual Notes

Participants are working within the constraints of the problem statement, which does not provide the speed of the cylinder directly. The original poster's confusion about the relationship between potential and kinetic energy is evident.

tonedog12345
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Kinetic Energy rotational motion problem, help please!

Homework Statement



A 2.4 kg cylinder (radius = 0.11 m, length = 0.50 m) is released from rest at the top of a ramp and allowed to roll without slipping. The ramp is 0.62 m high and 5.0 m long.

(a) When the cylinder reaches the bottom of the ramp, what is its total kinetic energy?
(b) What is its rotational kinetic energy?
(c) What is its translational kinetic energy?

Homework Equations



klinear = 1/2mv^2
krotation = 1/2Iw^2

The Attempt at a Solution



tried plugging in 2.4 for mass but have no clue how to get the speed, when its not given.
 
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HINT: Something is conserved.
 


ummm that really doesn't help me..
 


tonedog12345 said:
ummm that really doesn't help me..
Which quantity do you think is conserved?
 

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