The ocean is a vast reservoir of kinetic energy, but it’s also a challenging place to generate electricity. Which of these does NOT present a challenge when using wave energy to provide electrical energy? a) Waves are too inconsistent to be useful.
b) Salt water can corrode metal components.
c) Storms and forceful waves can damage power systems or loosen them from their moorings
d) Barnacles and other sea creatures can cling to exposed surfaces, blocking intakes and weighing down machinery.

Astudent looks at ocean waves coming into the beach. an ocean wave with more energy will a) have a greater height. b) have a greater period. c) travel toward the beach faster. d) strike the beach with greater frequency.

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

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.