An electrostatic precipitator with 3,500 m2 of collector plate area is 94% efficient in treating 300 m3/s of flue gas from a 200-MW power plant. How large would the plate area (in m2) have to be to increase the efficiency to 99%?

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed