If the mass of a planet is 0.231 me and its radius is 0.528 re, estimate the gravitational field g at the surface of the planet. the gravitational acceleration on earth is 9.8 m/s 2 and the value of the universal gravitational constant is 6.67259 × 10−11 n · m2 /kg2 . answer in units of m/s 2 .

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.