in amachine the load moves 2 metres when the effort moves 8 metres if an effort of 20 newton is used to raise a load of 60 newton ,what is the efficiency of the machine?​

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

What structural formula represents 4 electrons shared between two atoms?

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.