The temperature of the engine oil of a diesel engine needs to be reduced from 95 oC to 70 oC. A cross-flow heat exchanger (HE) is used for this purpose. The engine oil flows through the tubes which are arranged in a 7 x 7 array. Water is used as a coolant which flows over the tube array. The water enters the HE at a mass flow rate of 2.22 kg/s and exits at 33 oC. The mass flow rate of the engine oil is 1.5 kg/s. The specific heats of the oil and water are 1.9 kJ/kgK and 4.18 kJ/kgK, respectively, and the convective HT coefficients are 1,000 W/m2K and 1300 W/m2K, respectively. If the tube diameter is 1 cm (ignore its wall thickness), determine the length of the tube bank

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i think the answer is tomato juice? not entirely sure though

it's a b and

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

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