33) For a lightly damped vibrating system executing steady state forced vibration, the phase lag of displacement with respect to force at resonance is

34) The ratio of volume to surface area of a solid semi sphere is related to its radius through

35) 98x98+2x100x2-4 is _____

36) Relief angle in a cutting tool generally varies from

37) In Lewis equation for bending stress, gear tooth is considered as