- #1
tonit
- 55
- 1
Homework Statement
mass of the mouse = 0.05 kg
disc's radius = 0.2m
disc's angular speed = 33 rev / min
assume that the angular speed ω doesn't change
Homework Equations
tangential speed = ω * r
The Attempt at a Solution
well, what i did was: drew the vectors, one was the tangential speed of the circle, another one was the radius which is the displacement of the mouse.
the vector connecting the ends of both these vectors is supposed to be the speed of the mouse
since tangential speed and radius are perpendicular, then with the Pythagoras's theorem the speed of the mouse is v^2 = vt^2 + r^2
then I calculated the work done by the change of energy
ΔE = [((1/2)mv^2 ) + Iω^2] - Iω^2 (since the omega doesn't change)
am I right, if not any suggestions. thanks