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Ohio Energy Project
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Gravity
Terms in this set (47)
renewable energy
A resource that can be replaced when needed.
Nonrenewable Energy
A resource that cannot be replaced once used.
Biomass
any organic matter (anything that was once alive) that can be used as an energy source such as wood, crops, and yard waste.
Coal
a combustible black or dark brown rock consisting mainly of carbonized plant matter, found mainly in underground deposits and widely used as fuel.
geothermal energy
Energy derived from the heat in the interior of the earth
Hydropower
Electricity generated from the energy of moving water
natural gas
flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground (often in association with petroleum) and used as fuel.
petroleum
fossil fuel that looks like a black liquid, another name for oil
Propane
Fossil fuel refined from natural gas and petroleum
solar energy
energy from the sun
Uranium
fuel used by most nuclear power plants. During nuclear fission, atoms are split apart to form smaller atoms, which releases energy.
wind energy
The energy captured by transforming the motion of air into electrical energy using a turbine
potential energy
stored energy that results from the position or shape of an object
Elastic Energy
the potential energy of an object that is stretched or compressed
elecrical energy
movement of electrons. Lightning and electricity are examples.
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Verified questions
ENGINEERING
Air is compressed steadily and adiabatically from $17^{\circ} \mathrm{C}$ and 90 kPa to $200^{\circ} \mathrm{C}$ and 400 kPa. Assuming constant specific heats for air at room temperature, the isentropic efficiency of the compressor is (a) 0.76 (b) 0.94 (c) 0.86 (d) 0.84 (e) 1
ENGINEERING
Determine the mole fraction of dry air at the surface of a lake whose temperature is $18^{\circ} \mathrm{C}.$ The air at the lake surface is saturated, and the atmospheric pressure at lake level can be taken to be 100 kPa.
ENGINEERING
It is well known that water freezes at 0$^\circ{}$C at atmospheric pressure. The mixture of liquid water and ice at 0$^\circ{}$C is said to be at stable equilibrium since it cannot undergo any changes when it is isolated from its surroundings. However, when water is free of impurities and the inner surfaces of the container are smooth, the temperature of water can be lowered to -2$^\circ{}$C or even lower without any formation of ice at atmospheric pressure. But at that state even a small disturbance can initiate the formation of ice abruptly, and the water temperature stabilizes at 0$^\circ{}$C following this sudden change. The water at -2$^\circ{}$C is said to be in a $metastable\:state$.Write an essay on metastable states, and discuss how they differ from stable equilibrium states.
ENGINEERING
A spherical balloon that is to be used in air at 60[/math]^${\circ}$F[/math] and atmospheric presssure is tested by towing a 1/12 scale model in a lake. The model is 1.4 ft in diameter, and a drag of 37 lbf is measured when the model is being towed in deep water at 5 ft/s. What drag (in pounds force and newtons) can be expected for the prototype in air under dynamically similar conditions? Assume that the water temperature is 60$^{\circ}F$.