Considering how the predictions compare to the observations, what does this imply about the mass distributed in the galaxy

What is the difference between electrically neutral objects and electrically charged objects

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

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.