- #1
annamal
- 387
- 33
- Homework Statement
- A massless disk of radius R has an embedded particle
of mass m at a distance R/2 from the center. The disk is released from rest in the position
shown below and rolls without slipping down the fixed inclined plane. Find the velocity
- Relevant Equations
- v = dr/dt
This is the problem:
I am a little confused at the solution below. Since ##\vec r_{P/C} = (R/2)*(5 + 4cos(\theta))^{0.5}\ \vec e_r##, I am wondering why there is no vector e_r component for the velocity. I know that d(R)/dt = 0, but you can still get a derivative in the ##\vec e_r## direction from dcos(theta)/dt
I am a little confused at the solution below. Since ##\vec r_{P/C} = (R/2)*(5 + 4cos(\theta))^{0.5}\ \vec e_r##, I am wondering why there is no vector e_r component for the velocity. I know that d(R)/dt = 0, but you can still get a derivative in the ##\vec e_r## direction from dcos(theta)/dt
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