Asection of pipe pertaining to a certain machine vibrates with large amplitude of compressor speed of 220 rp*. for arralyztng this system; spring mass system was suspended from the pipe to ict as an absoiber, a 1 kg absorber mass tuned to 220 cpm resulted in two resonant frequencies 188 and 258 cpm. what must be the mass and the spring stif& ress of the absorber if the resonant frequencies are to lie outside the range of 150 to 310 cpm?

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.