10. Which of the following is a true statement?
A Grazing cattle on cool season grasses throughout the year prevents
soil erosion
B. Vegetative cover increases sol porosity and prevents soi
detachment.
C. Farming for intermediate income and farming long-term income have
the same effects on sol conservation.
D. All crops use the same amounts of nutrients in soil

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