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Al P
Lv 7
Al P asked in Science & MathematicsPhysics · 1 decade ago

A drat races a 3 sided coin rematch!?

A solid spherical drat of mass m radius r where g'=0.5g

races a solid "3 sided coin" of mass m radius r and of length

equal to 4r where g'=3g start rolling down the same incline at the

same time.

And the winner is?

Update:

Fifi:

Suggested categories: hobbies & craft

Ans: no,no,no,no

1 Answer

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  • Koshka
    Lv 5
    1 decade ago
    Favorite Answer

    Can the 3 sided coin be a cylinder?

    Are they on different planets?

    Does the lenght of the cylinder matter?

    See, I am not as smart as my contacts =/

    Why g? Do we need to find KE?

    KE of rotating sphere=1/2 * (2/5*m*r^2) *(v/r)^2

    KE of rotating cylinder 1/2 (1/2 m*r^2) *(v/r)^2

    ________________________________________

    Edit:

    OK, Hmmm, in haste made mistake!

    ke=1/2mv^2+1/2iw^2

    Sphere: 1/2 m * (sqrt 10*0.5g * h)/7 + 1/2 (2/5 mr^2) *((sqrt 10*0.5g * h)/7)r^2

    I do not like to make up excuses, so I shall leave it to more knowledged people like mathematicians, physicists and engineers to take it feom there.

    Good luck with that 3 sided coins folks!

    Snow is waiting! Yipee!!!

    Source(s): Obnoxious!
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