Differentiate between:
Waterways and Airways.
Waterways: Waterways are natural or artificial bodies of water used for transportation. Rivers, lakes, and canals are common examples of waterways that allow ships, boats, and barges to transport goods and people.
Airways: Airways are paths or routes taken by aircraft in the sky. They are not physically visible like waterways but are tracked by air traffic control systems, connecting airports for passenger and cargo transport.
Case for Free Trade
The act of opening up economies for trading is known as free trade or trade liberalisation. This is done by bringing down trade barriers like tariffs. Trade liberalisation allows goods and services from everywhere to compete with domestic products and services.
Globalisation along with free trade can adversely affect the economies of developing countries by not giving equal playing field by imposing conditions which are unfavourable. With the development of transport and communication systems, goods and services can travel faster and farther than ever before. But free trade should not only let rich countries enter the markets, but allow the developed countries to keep their own markets protected from foreign products.
Countries also need to be cautious about dumped goods; as along with free trade dumped goods of cheaper prices can harm the domestic producers.
Explain the construction of a spherical wavefront by using Huygens' principle.
The perpendicular distance of the plane \( r \cdot (3\hat{i} + 4\hat{j} + 12\hat{k}) = 78 \) from the origin is __________.
Derive an expression for maximum speed of a vehicle moving along a horizontal circular track.