A power station with an efficiency of 0.4 generates 108 W of electric power and dissipates 1.5 × 108 J of heat energy each second to the cooling water that flows through it, which increases its temperature by 3 Celsius degrees. Knowing that the specific heat of water in SI units is 4184 J/kg·°C, show that 12,000 kg of warmed water flows through the plant each second.
The Water Cycle • What is the original source of all rivers and streams o Precipitation o Water produced by magma o Fluids released by weathering o All of the above • What percentage of water is fresh o 35% o 8.5% o 2.7% o <1% • The majority of water is stored in oceans, but only a small percentage is consumable by humans o A large percentage of fresh water is also trapped in glaciers, making even less than 2.7% accessible to humans • Water is always cycling and is the principle source of all erosion and sedimentation • The Paths of Water: the water cycle is driven by solar power o Evaporation: driven by heat from the sun o Precipitation: driven by gravity o Ice
