Question

Energy from gravitational field is energy obtained from:
A Wind
B Biomass
C Tides
D Coal

Answer 1

According to physics, energy is the quantitative quality that must be provided to a body or physical system in order to perform work on it or heat it. Energy is a conserved quantity, which means it may be altered in form but not created or destroyed, according to the conservation of energy principle. According to the International System of Units, a joule is the amount of energy provided to an object by moving it one metre against a force of one newton (SI).

Complete step by step solution:
Tidal power, also known as tidal energy, is generated by transforming the energy contained in the tides into useable types of energy. The wind and the sun are less reliable than the tides. Tidal energy has traditionally had a high cost and restricted availability of locations with sufficiently large tidal ranges or flow velocities, limiting its total availability among renewable energy sources. However, numerous recent technological advancements and improvements, both in design and turbine technology, suggest that overall tidal power availability may be substantially higher than originally thought, and that economic and environmental costs may be reduced to competitive levels.
The Earth's oceanic tides provide tidal energy. Tidal forces are caused by periodic changes in the gravitational pull of celestial bodies. In the world's seas, these forces produce comparable movements or currents. When a result, sea levels fluctuate on a regular basis as the Earth spins. Due to the constant rhythm of the Earth's rotation and the Moon's orbit around the Earth, these changes are very regular and predictable. The magnitude and fluctuations of this motion are caused by the shifting locations of the Moon and Sun in relation to the Earth, as well as the impacts of the Earth's rotation and the local topography of the seabed and coasts.
The Earth-Moon system loses mechanical energy as a result of the pumping of water via natural limitations around coasts and the resulting viscous dissipation at the bottom and in turbulence.
Hence option C is correct.

Note: Tidal barrages take advantage of the potential energy contained in the height difference between high and low tides. The potential energy from a tide is captured by strategically placing specialised dams when employing tidal barrages to generate power. The brief boost in tidal power is funnelled into a huge basin behind the dam, which holds a great quantity of potential energy, when the sea level rises and the tide begins to flow in. As the tide recedes, this energy is transformed to mechanical energy as the water is discharged via huge turbines, which generate electrical power via generators. Barrages are basically dams that span the whole length of a tidal estuary.