Which of the following represents ways a homeowner can minimize conduction? by installing whole-house fans, insulating walls, and placing reflective materials on the roof
by placing reflective materials on the roof, installing energy-efficient windows, and installing whole-house fans
by insulating walls, installing energy-efficient windows, and installing whole-house fans
by insulating walls, placing reflective materials on the roof, and installing energy-efficient windows

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