10–25. The 45° strain rosette is mounted on the surface of a shell. The following readings are obtained for each gage: ε a = −200(10−6), ε b = 300(10−6), and ε c = 250(10−6). Determine the in-plane principal strains.

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise