Question

A regular tetrahedron has mass 10 kg and side length 1m. It is resting on a table with one face touching the table. What is the minimum energy required to flip it over onto another face?

Answer 1

Answer:

fL≥mg

⇒μN≥mg

⇒μmrω2≥mg

⟹ω≥rμg

ωmin=rμg

⟹ωmin=0.1×110=10 rad/s