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In the instant when the DVD is dropped, it will have an acceleration of g, with no drag force acting on it as it is not moving. As the DVD accelerates downwards, the drag force acting on it increases and ...

Efficiency=useful energy /input energy x 100, so for the kettle, efficiency = 65/100 x 100 = 65% efficient. The rest of the energy is wasted as heat energy in the kettle/sound energy.

The way a simple virus invades a cell is with double stranded DNA replication. The virus has a coat of protein covering the DNA, once bound to the side of the cell the virus releases the DNA where it is t...

The way in which an essay is structured makes a huge difference to its effectivity and is one of the key criteria in receiving a good mark. The first crucial component of a successful essay is a good intr...

A tax can be indirect, imposed by the government on goods and services (e.g VAT) or direct (e.g. income tax). There are 2 types of indirect taxes: specific tax, which is a set amount and ad valorem, a per...