Consider a reciprocating engine with crank radius R and connecting rod of length L. The secondary unbalance force for this case is equivalent to primary unbalance force due to a virtual crank of _______.
1
radius L/2 rotating at twice the engine speed
2
radius R/4 rotating at half the engine speed
3
radius \(\frac{L^2}{4R}\) rotating at half the engine speed
4
radius \(\frac{R^2}{4L}\) rotating at twice the engine speed