What are long, thin strands of glass that carry light for long distances? optical wires lasers optical fibers holograms

How have the competing explanations' experiments on atoms affected the development of the atomic model?

What do you think car designers do if the damage caused by a crash test is too severe?

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.