Top answers

A kettle is found to output 65J when its input energy is 100J. What is the efficiency of the kettle, and what happens to the rest of the energy?

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.
JL
Answered by Joshua L. • Physics tutor
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How does HIV invade cells?

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 then...
SC
Answered by Susanna C. • Biology tutor
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How should I structure my essay?

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 introdu...
JB
Answered by Jasmine B. • English tutor
3189 Views

How can a tax be represented in a simple demand and supply diagram?

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 percen...
CN
16364 Views

How can I prepare for my writing paper?

Having a good range of topic specific vocabulary is key. The writing papers are not massively long; however, it is important that you include grammatical structures to show the examiner your understanding of...
PM
Answered by Philip M. • French tutor
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